If you have climbed into a rooftop tent with two kids, a dog and a bag of wet boots, you already know the problem. The bed is the bed. Everything else has to happen in the rain. A rooftop tent annex room fixes that by zipping an enclosed, ground-level room onto the base of your tent, so the cooking, changing, drying and dog sleeping all happen outside the sleeping area.
We spent 2026 season reading owner reviews and comparing specs across every annex currently listed for rooftop tents, then narrowed it to the twelve that matter. The honest truth is that compatibility decides almost everything, because a roof top tent annex is not a universal-fit product. It zips to a specific tent’s base perimeter or rail, which is why the brand and model on the tag matter more than any other number in the listing.
Below you’ll find our ranked list of the best annex rooms for rooftop tents, what each one does well, where it falls short, and how to confirm it fits your rig before you order. If you have not picked the tent yet, start with our rooftop tent roundup first, because the annex options narrow significantly once the tent is chosen.
Table of Contents
What Is a Rooftop Tent Annex Room?
A rooftop tent annex room is an enclosed, waterproof fabric room that zips onto the base of a rooftop tent and extends down to the ground, creating a ground-level living space for changing, gear storage, a camp kitchen or additional sleeping.
Mechanically it is simple. A fabric skirt runs around the base perimeter of the tent, heavy-duty zippers connect it to the tent, and aluminum or steel poles drop to the ground to hold the walls out. Guide ropes and stakes handle wind. Most annexes include mesh windows for ventilation, and most include some form of waterproof floor, though the floor is the single most inconsistent feature across brands.
What you gain is a room at ground level that you can stand up in, walk through, and leave muddy things in. What you give up is pack space and a few minutes at every camp change. Owners on r/rooftoptents describe the same effect in their own words: boots and wet gear stay outside, and the sleeping area above stays noticeably cleaner.
Top 3 Annex Room Picks for Rooftop Tents in 2026
Our top three cover three different rig types, because the best annex room for rooftop tents depends entirely on which tent you own.
The Smittybilt takes the top spot because it is the only option here with a full block of consistently positive owner feedback, a removable floor in the box, and zipper attachment that owners report takes minutes. The ARB is the pick if you want the longest ownership history in the group and can add your own floor. The Thule is the one to look at if you want an enclosed room on a cold morning and an open awning in the afternoon.
Best Annex Rooms for Rooftop Tents (October 2026)
Every annex below is model-specific. The Key Features column is the fastest way to narrow your list before you read the individual reviews.
| Product | Specifications | Action |
|---|---|---|
| Smittybilt 2688 GEN2 XL Annex |
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Check Latest Price |
 ARB 804100 Simpson III Annex |
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Check Latest Price |
 OVS TMBK Roof Top Tent Annex |
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Check Latest Price |
 Naturnest Sirius 1 Plus Annex |
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Check Latest Price |
 OVS Xd Sherpa S4S Annex |
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Check Latest Price |
 Body Armor Sky Ridge Pike 3 Annex |
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Check Latest Price |
 OVS HD Bushveld 4-Person Annex |
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Check Latest Price |
 Tuff Stuff Delta and Trailhead Annex |
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Check Latest Price |
 Tuff Stuff Alpha II Clam Shell Annex |
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Check Latest Price |
 Thule Approach Annex |
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Check Latest Price |
 Ironman 4×4 Cross 1200 Annex |
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Check Latest Price |
 Topoak Vision 75 inch Annex |
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Check Latest Price |
1. Smittybilt 2688 GEN2 XL Overland Tent Annex: Best Overall
Smittybilt 2688 GEN2 XL Overland Tent Annex
Fits Smittybilt GEN2 XL 2683 only
Removable zippered floor
4 windows, 4 pockets, 4 stakes
22 pounds
Pros
- Zip attachment that owners say takes minutes
- Removable heavy-duty floor liner in the box
- Waterproof polyester and polyurethane build
- 4 windows and 4 pockets for storage
- Color matches the parent GEN2 XL tent
Cons
- Only fits the Smittybilt GEN2 Overlander Tent XL 2683
- Listed dimensions read small for the interior space
- 22 pounds is real weight on the rack
This is the annex we kept coming back to while putting this list together. All 20 owner reviews sit at 5 stars, and the praise is remarkably consistent: it attaches in minutes, the material is waterproof, and the floor liner is removable. That is exactly the trio of things buyers care about.
We also like the inner door flap, which opens straight into the vehicle so you are not dragging wet gear through the sleeping area to reach the ladder. Reviewers describe the room as usable for changing, clothes storage and additional sleep space, which matches how most people actually use one.
The catch is entirely about fit. This one works with the Smittybilt GEN2 Overlander Tent XL, part number 2683, and nothing else. If that is your tent, the question is answered. If it is not, keep reading rather than trying to adapt it.
Another detail worth noting is the listed size, which reads small for the room it creates. Owners still rate the usable space highly, but if you are planning on two adults sleeping inside, read the recent reviews for sizing first.
What makes it the best overall pick here
Nothing else in the group combines a complete feedback history, an included floor, and a wall of positive comments about the same three things. The Smittybilt also ships with four stakes and four interior pockets, so you are not hunting for tie-downs or storage on first setup.
Where it falls short for your setup
It is model-locked to a single tent, and at 22 pounds it is a meaningful addition to an already heavy roof load. If you already carry a kitchen, water and recovery gear, check your vehicle payload before committing.
2. ARB 804100 Simpson III Rooftop Tent Annex: Best Value
ARB 804100 Simpson III Brown Rooftop Tent Annex/Changing Room
55 x 94.4 x 51 inches
Two rooms, 4 person
Aluminium poles
13 pounds, two-year warranty
Pros
- Fabric and hardware hold up over years of storms
- Heavy-duty zippers that stay smooth
- 13 pounds is the lightest here
- Two-room layout for four occupants
- Two-year warranty
Cons
- No floor included
- Instructions are unclear and two people help with the lift
- Included pegs have a round cross-section that lets guylines slip
The ARB has the longest ownership history in this roundup. Owners describe annexes that have been through years of storms with no rain penetration, and zippers that still run smoothly after that same treatment. That is the durability signal you want from fabric that spends its life in the weather.
At 13 pounds it is also the lightest annex on the list, which matters if your rack load is already tight. The 55 by 94.4 by 51 inch footprint and two-room layout are designed around four occupants, and the 51 inch peak height is enough to stand in a crouch.
The 3.6 average rating needs context, and the context is in the distribution: roughly a third of reviews sit at one star. Almost all of those complaints are about the same three things, none of which are the fabric. Installation is awkward, the instructions are weak, and no floor is included.
Reviewers also flag the supplied pegs. The round cross-section lets guylines spin in the ground, so bringing your own stakes is a sensible first move. Add a floor of your own and the biggest complaint disappears entirely.
Why this is the best value option
You are buying proven long-term weather performance and the lowest weight in the group. If you already own a groundsheet or plan to add one, there is little left to fix.
Where the rating gets dragged down
Setup is a two-person job on a roof, and owners are blunt about the instructions. Plan on a calm afternoon for the first install, and budget for a separate floor since none is in the box.
3. Overland Vehicle Systems TMBK Roof Top Tent Annex: Best Four-Season Fabric
Overland Vehicle Systems LD TMBK Roof Top Tent Annex Green Base with Black Floor & Travel Cover – 420D Polyester Oxford Waterproof Material -1000g PVC Based Floor
420D waterproof oxford body
Removable 1000g PVC floor
4 doors, 81 inch height
15 pounds, 4-year warranty
Pros
- Removable 1000g PVC floor lifts out completely
- 420D waterproof oxford body
- 4 doors plus roll-up windows and doors
- 15 pounds
- 4-year warranty
Cons
- Only fits the OVS TMBK Roof Top Tent
- One review means durability is unverified
- Sleeve pole attachment takes practice
The spec sheet here is unusually complete for a model-specific annex. You get a 420D waterproof polyester Oxford body, a removable 1000g PVC floor, and 120g fade-less mesh on the doors and windows so bugs stay out while light still gets in.
Four doors is unusual at this size, and with an 81 inch peak height the room reads as genuinely usable rather than a crawl space. Windows and doors roll up for compact stowage, and a storage bag is included.
Our caution is simple: this listing has a single review behind it. The 5-star rating reflects one favorable first impression, which is not the same as a decade of field data. The build specs are strong on paper, and the four-year warranty is among the longest here, but plan on treating the first season as a shakedown.
Why it stands out for four-season use
The removable PVC floor is the reason. It is the only ground layer here that is both genuinely waterproof and completely detachable, so you can wash it, replace it, or run the annex without a floor on hot dry camps.
Where it will not work for you
It attaches to the OVS TMBK Roof Top Tent only, and the sleeve pole attachment system is slower than a clip or zip frame the first few times. Anyone on a different tent should skip this one entirely.
4. Naturnest Sirius 1 Plus Annex Room: Best for Blackout Privacy
Naturnest Sirius 1 Plus Annex Room for Naturnest Sirius 1 Plus Rooftop Tent Only, Not Include Rooftop Tent
143.7 x 83.46 x 71 inches
Blackout fabric with mesh window
10 minute setup
35 pounds
Pros
- Full blackout fabric with a breathable mesh window
- 10 minute assembly
- 420D tear-resistant sunproof and rainproof fabric
- Generous floor area for two
Cons
- Compatible tent sold separately
- 35 pounds is the second heaviest here
- Condensation builds up in wet weather
This annex answers a problem most listings ignore: how much light comes through. The body is a full blackout fabric, and the mesh window is there when you want airflow. For families with kids sleeping nearby, that combination is worth more than most spec-sheet features.
Setup is genuinely fast. You connect to the rail under the tent, attach the fabric with Velcro, and drop in the support pole, wind ropes and ground nails. The owner who reviewed it describes setup and breakdown as far quicker than pitching a ground tent, which matches the 10 minute assembly claim.
The same owner ran a week-long trip through heavy Pacific Northwest rain with the zippers closed and stayed warm and dry. They also flagged condensation inside the enclosure, which is a normal trade for any sealed fabric room in wet weather.
Why it works for families and light sleepers
The blackout body is the headline feature here, and the 143.7 by 83.46 by 71 inch envelope gives real floor area for two. If you are using the annex as a second sleeping room rather than a gear closet, this is one of the few on the list where that works without feeling cramped. If a full second bedroom is what you need, our family tent guide is worth a look as well.
Where it becomes the wrong purchase
It is a single-model part. The Sirius 1 Plus rooftop tent is not included, so you are committing to the tent as well. At 35 pounds it is also one of the heaviest, which will show up on your roof rating and your arms.
5. Overland Vehicle Systems Xd Sherpa S4S Annex: Best for Sherpa Owners
Overland Vehicle Systems 18009811: Xd Sherpa S4S – Annex Room with Floor, Black Body & Grey Trim
Annex room with floor included
Black body, grey trim
4-season rating
Designed for the Xd Sherpa S4S
Pros
- Floor is included in the box
- 4-season rated construction
- Black and grey trim matches the Sherpa line
- Straightforward installation
Cons
- Only one review on record and it is one star
- No dimensions or weight published
- Fits the Xd Sherpa S4S only
We include this one for Sherpa owners and for honesty about what thin data looks like. The specification listing here is sparse: no dimensions, no weight, no fabric detail. What it does state is that a floor is included, which puts it ahead of several rivals.
The single customer review on record is one star, and there is no substantive feedback to explain it. Product copy claims easy installation and durable construction, but copy is not evidence. If you own the Sherpa S4S, this is the matching part and the choice is simple.
If you do not own it, skip past this listing. There is no cross-compatible option here, and you would be buying on brand name rather than on any measurable strength.
What it does right for existing owners
The included floor is the concrete advantage. No extra purchase is needed to get a sealed ground layer, and the four-season rating matches the Sherpa line it is built for.
Why the evidence is too thin to recommend broadly
One review, one star, and no published specs. That is not enough to judge fit, fabric weight or longevity, and we will not pretend otherwise. Pair it with a call to the manufacturer if you want detail before ordering.
6. Body Armor 4×4 Sky Ridge Pike 3 Annex: Best for UTV Setups
Body Armor 4×4 Sky Ridge Pike 3 Annex Room 20016
52 sq ft of added space
420D ripstop Oxford body
550GSM PVC coated floor
Door plus two large windows
Pros
- Adds 52 sq ft of downstairs living space
- 420D ripstop polyester Oxford body
- 550GSM PVC coated waterproof floor
- Entry door plus two large windows
- Two year finish and limited lifetime warranty
Cons
- Annex only
- tent and rack sold separately
- No UV protection listed
- No customer reviews to verify fit
Body Armor builds for the side-by-side market, and this annex shows it. The 52 sq ft of added space is a substantial footprint, and the UTV-specific fit means the mounting geometry is designed for a short, wide rack rather than a truck bed.
Construction is solid on paper: 420D ripstop polyester Oxford walls, a 550GSM PVC coated waterproof floor, and heavy windows for light. The two year finish and limited lifetime manufacturer warranty is a strong claim for the category.
There are no customer reviews on record, so every quality statement here comes from the manufacturer listing. Treat the specs as a good description of intent rather than a proven field result, and confirm the rack geometry with the seller before committing.
Why it suits a UTV or short-wheelbase build
The 52 sq ft of enclosed ground-level space and the wide window placement are the draw. If your rig is a UTV or a compact trailer setup, this is one of the few annexes on the list designed around that footprint rather than a pickup bed.
Where the gaps are
The tent, rack and accessories are all sold separately, and no UV protection is listed, which is worth thinking about for long summer days. With no owner feedback, you are buying on brand reputation alone.
7. Overland Vehicle Systems HD Bushveld 4-Person Annex: Best for Warranty Cover
Overland Vehicle Systems HD Bushveld Annex for 4 Person Roof Top Tent – 420D Heavy Duty Polyester Rip-Stop Material with 120G Fadeless Gaze Breathable Windows – Secure Storage Bag
For 4 person rooftop tents
420D ripstop body
120G fadeless mesh
20.9 pounds
Pros
- Limited lifetime warranty
- 420D heavy duty ripstop waterproof fabric
- Stainless steel poles with clip attachment
- Two rooms plus a vestibule
- Storage bag included
Cons
- Designed only for 4 person rooftop tents
- 20.9 pounds is a heavy pack item
- No customer reviews to confirm durability
The Bushveld is the one to look at if warranty length is your deciding factor. A limited lifetime warranty is the strongest coverage claim in this entire group, and it changes how you think about a part that lives permanently on your rack in sun and rain.
The build follows the same pattern as the rest of the OVS line: 420D heavy-duty polyester rip-stop fabric rated waterproof, 120g fade-less breathable mesh windows that resist UV fading, and stainless steel poles on a clip attachment system. Two rooms and a vestibule give you a layout most single-room annexes cannot.
Be aware of the 20.9 pound pack weight, which is one of the heavier entries here. And again, no owner reviews exist yet, so the warranty promise is the strongest evidence available rather than field reports.
Why the two-room layout is worth the weight
A vestibule plus two rooms lets you separate wet gear from clean gear, or put the dog in one side and keep food in the other. That separation is the whole argument for a heavier annex in a full overlanding setup.
Where the warranty does not solve the problem
It is built for 4 person rooftop tents specifically, so compatibility is narrow. Warranty length cannot compensate for a model mismatch, and the weight is a permanent fixture on your rack until you remove it.
8. Tuff Stuff Delta Overland and Trailhead Annex: Best for Tuff Stuff Soft Shells
Tuff Stuff Roof Top Tent Annex Room, W/Floor, Delta Overland & Trailhead TS-ANX-DLT-TH
Fits Delta Overland and Trailhead tents
Floor included
Tan color
1 year manufacturer warranty
Pros
- Purpose-built fit for Delta Overland and Trailhead tents
- Floor is included for a cleaner sheltered space
- Tan color matches the Tuff Stuff soft shell line
- One year manufacturer warranty
Cons
- Compatible only with select Tuff Stuff models
- No published weight or dimensions
- No customer ratings yet
This is the narrowest and most straightforward entry in the roundup. The Tuff Stuff Delta Overland and Trailhead annex does one job, which is giving those two soft shell tents a ground-level room with a floor already in the box.
Including the floor matters more than it sounds. A large share of premium annexes ship without one, and that is the number one question in rooftop tent forum threads. Here you get it as part of the package, which removes a follow-up purchase and a sizing decision.
What we cannot tell you is much else. No weight, no dimensions and no owner feedback are published for this listing, so the practical details will need to come from Tuff Stuff directly. We would not buy this without confirming the fit with your specific tent variant first.
Why it makes sense for Delta and Trailhead owners
A guaranteed model fit plus an included floor is a clean package. If your tent is one of these two, you avoid the compatibility research that dominates every other product on this list.
Where the details are missing
Weight and packed size are unpublished, so you cannot budget rack capacity from the listing. With no reviews, durability is unverified, and the one year warranty is the shortest we cover here.
9. Tuff Stuff Alpha II Clam Shell Annex: Best for Hard Shell Setups
Tuff Stuff Overland TS-ANX-CS2 Alpha™ II Clam Shell RTT; Annex Room
87 x 82 inch floor area
600D poly-oxford walls
1000D PVC floor
Guide ropes included
Pros
- Largest published floor area at 87 x 82 inches
- 600D poly-oxford walls with 1000D PVC floor
- Guide ropes included for windy conditions
- 4-season rated
- Two person rated
Cons
- Alpha II rooftop tent sold separately
- 37 pounds is the heaviest pack weight here
- No customer reviews to confirm durability
Hard shell setups are where an annex earns its keep, because the shell is already sealed and the annex supplies everything it does not provide: floor area, a headroom, and weather cover at ground level. For the Alpha II, this is a 87 by 82 inch room rated for two.
Material-wise it is the toughest on the list: 600D poly-oxford walls over a 1000D PVC floor, with a PVC coating as the water resistance technology. Guide ropes ship in the box, which matters because a hard shell canopy is exactly the kind of surface that catches gusts.
The doors roll up to turn the enclosed room into open shelter, and the four-season rating holds up against the shell’s own claims. Two things temper that: the tent is sold separately, and at 37 pounds this is the heaviest annex in the roundup.
Why hard shell owners should look here first
You get a roomy 87 by 82 inch floor, the heaviest fabric, and a convertible door system in one package.
Where the weight and cost stack up
Thirty-seven pounds is a permanent addition to a rack that is already loaded, and the Alpha II itself is a separate purchase. Only add this if your payload and rack rating both have room to spare.
10. Thule Approach Annex: Best for Roll-Up Awning Mode
Thule Approach Annex for Medium Approach Rooftop Tent New
Doubles living space
Roll-up doors become an awning
Fits 63 to 85 inch clearance
Removable tarpaulin floor
Pros
- Front and side doors roll up to convert the room into an open awning
- Adjustable height fits a wide range of vehicles
- Mesh windows give ventilation without bugs
- Removable tarpaulin floor
- Limited lifetime warranty
Cons
- Not fully waterproof for heavy rain
- 7400 gram pack weight
- Only two reviews on record
The Thule is the only annex here that works as two products in one. With the front and side doors zipped down you have an enclosed room. Roll them up and the same structure becomes an open awning for cooking on a dry day.
Its adjustable height is the other standout. It suits vehicles with 63 to 85 inches of clearance from the ground to the base of the tent, which is the widest compatibility window of any model we reviewed and makes it a reasonable choice if you are unsure of your exact mounting height.
The 3.2 rating comes from just two reviews, and the split inside that pair is wide. Some buyers hit fit, condensation or weather resistance issues, while most rated it 5 stars. Note also that the listing marks it as not fully waterproof, so treat it as weather resistant rather than stormproof.
Why the convertible doors are genuinely useful
Most annexes force a choice between enclosed and open. The Thule removes it, which makes the room usable for a rainy morning briefing and a sunny afternoon cook without repacking anything. The mesh windows and removable tarpaulin floor support both modes.
Where the fit and weather limits show up
The height range is wide but it is still a range, and vehicles outside 63 to 85 inches will not work. At 7400 grams plus limited waterproofing, this is a fair weather enclosure rather than a storm shelter, and the two-review sample leaves durability unproven.
11. Ironman 4×4 Cross 1200 Annex: Best for Four-Person Space
Cross Roof Top Annex Room Tent 1200 by Ironman 4×4 AUS
120 x 80 x 120 inch enclosure
4 person rated
Weather-resistant fabric
20 pounds, 1 year warranty
Pros
- 120 x 80 x 120 inch enclosure rated for four
- Weather-resistant fabric with zippered access panels
- 20 pounds is manageable for the space provided
- Storage bag and instructions included
Cons
- Rated for spring
- summer and fall only
- Bulky to store between trips
- No customer reviews to verify weather sealing
The Cross 1200 is a tall, cube-shaped option in the roundup, at 120 by 80 by 120 inches and rated for four people. That vertical dimension is unusually generous, and it is the reason a family of four can use this as a real room rather than a gear closet.
Construction details are simple and honest: weather-resistant fabric, zippered access panels, and a straightforward attachment to the rooftop tent. The listing names dining, changing, extra sleeping and a private lounge as intended uses, which matches how most buyers repurpose a space this size.
Two limits stand out. The season rating covers spring, summer and fall, so it is not a winter option, and at 120 inches tall the packed profile is awkward to find room for between trips. There are no owner reviews yet.
Why four people fit better here than elsewhere
The 120 inch height and 4 person rating give you floor area and headroom together, which is the combination that makes a shared room workable. Weather-resistant fabric plus zippered panels is enough for a normal spring-through-autumn trip.
Where the bulk and season limits bite
A 120 inch packed profile is a real storage problem in a vehicle that already carries a rooftop tent. And if your season includes snow or hard freeze cycles, this rating does not cover it.
12. Topoak Vision 75 Inch Extra Spacious Annex: Best for Ground-Level Privacy
TOPOAK Annex Room for Vision Rooftop Tents，75″ – Extra Spacious
106 x 50 inch floor
Choose 63 or 75 inch version
Packs to 39 x 11 x 11
22 pounds
Pros
- Two size options to match your Vision tent
- 106 x 50 inch enclosed ground-level room
- Packs down to 39 x 11 x 11 inches for storage
- 22 pounds is a reasonable pack weight
Cons
- Compatible only with TOPOAK Vision rooftop tents
- Water resistant rather than fully waterproof
- No customer reviews to confirm seam performance
The Topoak is sold in two widths, 63 inch Spacious and 75 inch Extra Spacious, and you choose based on your Vision rooftop tent. That is worth knowing before you order, because the two versions are not interchangeable and the listing makes the pairing explicit.
The 106 by 50 inch floor is narrower and longer than most entries here, which works well along the side of a vehicle. The description is focused on privacy and defined campsite space rather than cooking or standing headroom, and that is the design intent.
Packability is the practical strength. At 39 by 11 by 11 inches and 22 pounds, it is one of the more manageable annexes here for a vehicle that already carries a tent. Water resistance is listed as the level, not full waterproofness, so plan accordingly for driving rain.
Why it suits a Vision tent owner
Two size options and a clear model pairing remove the guesswork. If you want a private changing and relaxation room beside the tent rather than a second sleeping space, the long narrow footprint suits that job.
Where the limits are
It fits TOPOAK Vision tents only, and the water resistance rating stops short of full waterproof. With no owner reviews, seam and weather performance remain unverified in the field.
How to Choose an Annex Room That Fits Your Tent
Compatibility is not a feature you can negotiate on. Every annex in this roundup attaches to a specific tent’s base perimeter or rail, and that single fact eliminates most of the list before you start comparing anything else.
Confirm the exact tent model first
Start with the model number on your tent, not the brand. Smittybilt uses part number 2683, OVS builds separate annexes for the TMBK, the Sherpa S4S and 4 person tents, and Topoak splits its annex by Vision tent size. A shared brand name does not mean a shared zipper track.
Measure ground-to-tent-base clearance
Your annex hangs from the tent base, so the vertical gap between your rack and the ground determines whether it can reach the floor. The Thule publishes a 63 to 85 inch recommended range, which makes it the most forgiving option we found when the exact height is uncertain.
Decide about the floor before anything else
This is the most common ownership mistake in the category, and it comes up constantly in rooftop tent forum threads. The Smittybilt, OVS TMBK, Sherpa, Tuff Stuff Delta, Tuff Stuff Alpha II and Thule all include a floor. The ARB and Bushveld do not. Buying a bodiless annex for a kid-sleeping setup means buying a second piece before you can use it.
Read the fabric spec, not the marketing word
Look for the denier number and the floor material. 420D polyester Oxford and 420D rip-stop cover most of this list, with the Tuff Stuff Alpha II at 600D poly-oxford. Floors are typically 550GSM to 1000D PVC. Where a listing says water resistant rather than waterproof, treat sustained rain as a risk.
Budget the weight honestly
Annex weights here run from 13 pounds for the ARB to 37 pounds for the Alpha II. Add that to your tent, rack, recovery gear and water, then check your vehicle payload and your rack’s static rating. An annex that pushes past the rack rating will still go up the hill, but not the one you wanted.
Annex vs Awning: Which One Do You Need?
An awning is a half-wall shelter that shades and sheds rain. It is lighter, faster to set up and cheaper, and it is the right answer for cooking on a dry day. It offers no privacy, no bug protection and no wind shelter, which is why it fails most of the reasons people add an annex.
An annex is enclosed on all sides with a floor, so it works as a changing room, a dog room, a kid sleeping space or a bug-proof kitchen. It costs more in weight, bulk and setup time. For trips of three nights or more at one site, owners on r/rooftoptents often argue a ground tent or a canopy is the better tool, since you are not moving anyway.
Our read: if you move camps most days, buy the awning. If you have kids, a dog, or a mosquito season to get through, buy the annex.
Honest Drawbacks of Rooftop Tent Annexes
None of these are dealbreakers, but they are the reasons people regret an annex they bought for the wrong reason.
Bulk and weight. An annex is a large fabric object with poles, and the packed profiles on this list run up to 120 inches tall or 37 pounds. That is dead space in your vehicle for the whole year unless you use it constantly.
Setup time at every stop. Zipping, poleing and staking is extra work each time you move. Simple zip-on designs take minutes; multi-panel designs with several poles take considerably longer on the roof.
Zipper alignment problems. Buyers report annex zippers that do not line up with the tent’s track, which sends the product back. This is a manufacturing tolerance issue, and it is a good reason to keep your return window open after delivery.
No coverage over the ladder. The annex wraps the tent, not the entry. The area where you climb in usually stays exposed, which is why many owners run an awning alongside an annex rather than instead of one.
Condensation in enclosed rooms. Any sealed fabric space in wet weather will sweat. Ventilation panels help, and leaving a door cracked on a dry night makes a measurable difference.
How We Evaluated These 12 Annex Rooms
Every annex here is model-specific, so the first filter was fit: which tents the part actually attaches to, and whether the listing states it clearly. Products built for a tent nobody in our research owned were ranked on specs alone and flagged where evidence was thin.
From there we compared floor inclusion, fabric denier and floor material, published dimensions and weight, pole type, door and window counts, and warranty length. Where owner reviews existed, we weighted them heavily, because a decade of weather reports beats a bullet list. Where no reviews existed, we said so rather than filling the gap with copy.
What we could not test ourselves is worth stating plainly. We did not put these annexes through a season of rain and wind, so the durability picture in this roundup comes from owner reports plus published specifications. Use it to narrow your list, then confirm fit with the manufacturer before you commit.
Frequently Asked Questions
What is a roof top tent annex?
A roof top tent annex is an enclosed, waterproof fabric room that zips onto the base of a rooftop tent and extends down to the ground. It creates ground-level space for changing, gear storage, a camp kitchen or extra sleeping, usually with mesh windows, support poles, guide ropes and a removable waterproof floor.
Do all rooftop tents have annexes available?
No. Annexes are model-specific, and a shared brand does not mean a shared fit. In this roundup the Smittybilt fits only the GEN2 Overlander Tent XL 2683, Overland Vehicle Systems makes separate annexes for the TMBK, the Sherpa S4S and 4 person tents, and Topoak offers two sizes to match different Vision rooftop tents. The Thule is the broadest, with an adjustable range for vehicles measuring 63 to 85 inches from ground to tent base.
Can I use an annex from one brand on a different tent?
Almost never. Annexes connect to a specific zipper track or base rail, and misalignment is a common reason returns happen. The only partial exceptions are units with an adjustable-height frame, such as the Thule Approach, which is recommended for a range of vehicle clearances rather than a single tent model. Confirm the model number with the manufacturer before ordering.
Does a roof top tent annex come with a floor?
It depends entirely on the brand. The Smittybilt 2688, Overland Vehicle Systems TMBK, Sherpa S4S, Tuff Stuff Delta, Tuff Stuff Alpha II and Thule Approach all include a removable or integrated floor. The ARB Simpson III and the Overland Vehicle Systems Bushveld do not include one, so plan to add a separate groundsheet before using them for sleeping or for wet-weather storage.
Can I sleep in a roof top tent annex?
Yes, in the larger models. The Ironman 4×4 Cross 1200 is rated for four people at 120 by 80 by 120 inches, the Tuff Stuff Alpha II offers an 87 by 82 inch floor rated for two, and the Naturnest Sirius 1 Plus gives enough area for two with extra padding. Smaller units like the ARB work better as changing rooms or gear storage than as sleeping space.
Is a roof top tent annex worth it?
It is worth it if you move regularly and want a dry, bug-proof ground-level room for a kitchen, changing, kids or a dog. It is less valuable if you camp for three or more nights in one place, where a ground tent gives you more space, or if you have no mosquito pressure and only need shade, which an awning handles more cheaply and with less weight. The main cost is bulk, weight and extra setup time at every camp change.
Conclusion: The Best Annex Room for Your Rooftop Tent
After comparing twelve annex rooms, the Smittybilt 2688 GEN2 XL remains our pick as the best annex room for rooftop tents, because it is the only option here with consistent five-star owner feedback, a removable floor in the box, and zipper attachment that takes minutes. If you want proven long-term fabric at the lowest weight, the ARB Simpson III is the value choice, and adding a floor fixes its main complaint.
Everything else depends on the tent you already own. Match the model number first, measure your ground clearance, and check whether a floor is included before you think about anything else on the spec sheet. For more on the tents themselves, see our rooftop tent rankings and our rooftop cargo bag guide for keeping weight off your rack.
Updated for October 2026.