RV Garage Builders in Bozeman and Gallatin County, MT
Tall-door buildings sized around the vehicle you own rather than a nominal RV. Door height, interior clear height and the approach into the building get worked out before anything is framed.
No obligation. Every estimate starts with a walkthrough of the lot, the access and where the building can actually sit.
Gallatin County, MTThe build
The three measurements that decide the building
Get the door height wrong and the building is worthless for its only purpose. This is the one build where measuring twice is not a cliché.
An RV garage is a simple building with one unforgiving requirement. Everything else can be adjusted later; a door that is four inches too short cannot.
The first measurement is your vehicle's true height, including the air conditioner, the satellite dome, the vent covers and anything else on the roof. Manufacturer specifications routinely list a height that excludes rooftop equipment. Measure the actual vehicle, on level ground, at the tallest point.
The second is the door height, which needs clearance above the measured height for the door itself plus a margin for the approach. The third is the interior clear height, which is not the same as the door height, because the door opener, the track and the header all live above the opening.
Then there is the part people miss entirely: getting the vehicle in. A 40 foot coach needs room to line up outside the building. If the approach requires a turn, the apron and the driveway matter as much as the door, and that is a site problem rather than a building problem.
Included
What an RV garage build includes
Door, header and track
A 12, 14 or 16 foot high overhead door with a header engineered for the span and the snow load above it, plus high-lift or vertical-lift track where interior height is tight.
Tall walls, braced
Walls at 16 to 18 feet carry more wind load and need real bracing. The framing, the sheathing schedule and the truss connections all get designed for the height rather than scaled up from a garage.
Apron and turning room
A slab and apron sized so the vehicle can line up and enter straight, with grade worked out so the coach does not scrape on entry.
Sizing
Measure the vehicle, not the brochure
Class A coaches commonly run 12 to 13 feet 6 inches tall with rooftop equipment, and 33 to 45 feet long. Fifth wheels are often 13 feet or a little over. A toy hauler with a rooftop deck can be taller still. Those are typical figures, not a promise about your vehicle, which is exactly the point: measure yours.
Length drives the building more than most people expect. A 45 foot coach in a 45 foot building leaves nothing at either end, and the door has to close behind it. Add working room at the front, room to walk around the back, and space for the things that inevitably get stored alongside.
Width is usually the easiest of the three, but remember slide-outs. If you want to be able to extend a slide inside the building, the width requirement jumps.
Typical figures for planning only. We size the building from your measured vehicle, not from this table.
Process
How an RV garage project runs
Measure the vehicle
Height at the tallest rooftop point, length, width, and width with slides extended if you want to use them inside.
Check the approach
Where the vehicle comes from, whether it can enter straight, and what the grade does at the apron.
Set door and clear height
Door height, lift type, and the interior height needed above it for track and opener.
Engineer the tall walls
Bracing, header span and truss connections designed for the wall height and site snow load.
Permits
City building permit, or a county land use permit where a zoning district applies. Height limits are worth checking early.
Build
Footings and slab, tall wall framing, roof, envelope, door installation and opener commissioning.
Before you commit
Height limits, and the question to ask first
An RV garage is the build most likely to run into a height restriction, because it is genuinely tall. Some county zoning districts cap accessory building height well below what a 16 foot door needs, and the cap is measured from average finished grade rather than from the floor.
That question should be asked before anything is drawn. It is not always fatal: dropping the floor slightly, using vertical-lift track to reduce required interior height, or shifting the building to a lower part of the lot can all recover a foot or two.
The other early question is the septic system. On unincorporated ground, a building this long often collides with the drainfield or its required replacement area, and moving a drainfield is far more expensive than moving a building.
If you are on acreage where a shorter, wider post-frame building would work, that is often a better value for the same enclosed volume. We will say so.
Cost
Price it around your actual coach
The RV garage calculator asks for door height and building length separately, because those two drive cost far more than floor area does.
Questions
About rv garages
How tall does an RV garage door need to be?
Measure your vehicle at its tallest rooftop point, then add clearance. A 14 foot door covers most Class A coaches and fifth wheels comfortably. A 16 foot door covers almost anything and future-proofs the building if you may change vehicles.
Do not use the manufacturer's published height. It usually excludes air conditioners and vent covers, which is exactly what hits the header.
What does an RV garage cost?
Start from the detached garage bands and add for height. An unheated RV garage shell runs about $56 to $92 per square foot, with the premium over a standard garage coming from tall wall framing, bracing, the door and its header.
Length is the other multiplier. A building sized for a 45 foot coach is roughly twice the footprint of a two-car garage.
Can I heat an RV garage?
Yes, and the calculation is different from a shop. The volume is large and the door is a big cold surface, so an insulated door and a well-detailed envelope matter more than the heater size.
Many owners heat to a holding temperature rather than a working temperature, which is cheaper and prevents freeze damage. If you plan to work in there, treat it as a shop and insulate the slab.
Is there a height limit on accessory buildings?
It depends entirely on jurisdiction. Inside Bozeman, height is governed by the Unified Development Code that took effect on 1 February 2026. In unincorporated Gallatin County it depends on the zoning district, and some rural districts have notably restrictive accessory building height limits.
This is the first thing we check on an RV garage, before design, because it can change the entire approach. Source: Gallatin County Planning & Community Development.
Should I do a lean-to on the side?
It is often the best value in the whole project. A covered lean-to adds sheltered space for a boat, a trailer or firewood at a fraction of the cost per square foot of enclosed space, and it can be framed as part of the main roof structure.
Decide at design, because it changes the truss package.
Post-frame or stick-framed for an RV garage?
Post-frame often wins here. Tall walls and long clear spans are exactly what post-frame construction is efficient at, and the finish level on an RV garage is usually simpler than on a heated shop.
On a city lot, or where the building has to match a house, stick framing is generally the better fit.
Related
Other buildings people compare this with
Pole Barn Garages
Post-frame buildings for larger clear spans on acreage, where a stick-framed garage costs more than it needs to.
What is involved →Shops & Workshops
Heated, insulated working buildings with the ceiling height, power and floor drainage that real work needs.
What is involved →Detached Garages
Two, three and four-car detached garages built on their own footings, sized to the lot and the setbacks rather than to a catalogue.
What is involved →Next step
Send us the site, not just the size
An address and a rough footprint is enough to start. What the ground and the jurisdiction allow is usually the part that decides the project.