RV shelter planning & product research
What size carport fits
your camper or RV?
A structure's advertised size is not the space you can actually use. The free Size Finder turns your measurements into the exact clear width, length, and opening height you need — then shows you how to shop for it.
Start here
Two questions, then the full worksheet
Which rig you have and what your height figure already includes change the required clearance more than anything else you will be asked. Answer those here and the Size Finder opens with them already set.
What determines fit
Three dimensions decide whether it fits
Each one is routinely quoted from a figure that means something different from what the buyer assumed. That mismatch — not the size of the structure — is what produces a carport the RV cannot use.
- Clear opening heightQuoted as peak or frame height
- You do not drive in at the peak. The opening is governed by the leg height at the eave and reduced further by corner knee bracing, and that reduction is not standardised between frames.
- Usable clear widthQuoted as nominal frame width
- Advertised width is measured across the outside of the frame. The legs sit inside that measurement and the base rails intrude further, so the width you can actually use is narrower than the listing.
- Footprint lengthQuoted as advertised model length
- Advertised length usually describes the body rather than the footprint. What the structure has to cover runs from the furthest forward point to the furthest rearward point on the ground.
Start from your rig
Browse by camper or RV type
Different rigs fail differently. Each guide starts with the dimension that actually catches people out on that type.
Structure choices
Roof style changes the clearance you actually get
A peaked roof is tallest at the centre — but you drive in at the eave, where knee braces cut across the opening. Compare on clear entry height, never the headline figure.
- 01RegularHorizontal panels, rounded corners
- 02Boxed eaveSquared edge, largely cosmetic
- 03VerticalSheds snow and debris lengthwise
- 04EnclosedOften treated differently; confirm locally
Budget planning
Know which choices are expensive
Height, width, and length each move a quote for different reasons — taller posts and framing, longer trusses, or extra bays. Understanding how each choice adds cost is, in our planning judgement, more useful than a headline ranking, which is why we publish cost levers rather than invented price ranges.
Research
Guides worth reading before you buy
- RV carports: the complete guideThe whole decision, in the order to make it
- How to measure your RVEight measurements, in the order that matters
- How tall it needs to beThe dimension where error damages equipment
- Kits and DIY buildsWhat the box contains, and what it never does
- Research methodologyHow the sizing engine reaches its numbers
Common questions
Straight answers
- Do I need to size for slide-outs?
- Only if you intend to extend them while the RV is parked under the structure. Many owners never do, and sizing for extended slides can add six feet or more to the required width. The Size Finder treats this as an explicit choice rather than an assumption.
- Does this site tell me whether I need a permit?
- No. Permit requirements are set locally and change. We will not state that a permit is or is not required for your address, because we cannot verify that for every jurisdiction. What we can do is help you identify which office to ask and what to ask them.
How we work
Methodology
Our sizing logic is deterministic and versioned: the same inputs always produce the same output, and every inch added to a recommendation is traceable to a named allowance with a stated reason. Where a number came from a default rather than your tape measure, we label it.
We do not publish fabricated products, prices, dealer listings, reviews, ratings, or structural ratings. Where we do not have verified data, we say so rather than filling the gap. Editorial standards and research methodology set out how we source and review what is published here.
Your next step
Work out the clearance before you compare structures
Comparing listings is only meaningful once you know the opening you need. The Size Finder itemises every allowance it applies and labels anything it assumed rather than measured.