Covered decks and pergolas in Bozeman
Shade for July afternoons and a dry spot for spring and fall, built to carry what a Gallatin Valley winter puts on it.
Summer sun at nearly 4,800 feet is intense, and an open west-facing deck can be too hot to sit on late in the day. A pergola filters it. A solid roof blocks it and keeps rain and snow off part of the deck, which stretches the season into spring and fall.
Pergola or solid roof?
- Pergola. Open beams and rafters for partial shade. Simpler and lighter, but it won't keep rain off. Louvers or shade cloth can add cover.
- Solid roof. Tied into the house or standing on its own posts, with shingles or metal. Full shade and weather cover, but it's structural work that must carry snow.
How much snow does a deck roof have to hold?
Bozeman's design criteria list a ground snow load of 46 psf and a roof snow load of 41 psf, with a 30 psf minimum roof snow load after allowed reductions unless a Montana-licensed design professional justifies otherwise. Snow sliding or drifting off a taller house roof can pile up more. All of that runs down the posts to the footings, so covered decks usually need bigger posts and footings than open ones. The city also lists a 115 mph design wind speed, which matters for open structures that wind can lift.
Can I add a roof to my current deck?
Sometimes, but most existing decks weren't framed to carry one. A builder will check whether the footings and framing can take the load or whether new posts and footings are needed. If you're building new and might want a roof someday, size the footings for it now.
Permits
A third-party summary of City of Bozeman rules says covered decks need a building permit. Belgrade's building department handles projects inside its city limits. Outside the cities, ask your builder who has jurisdiction. A roof tied into the house also has to work with the house's roofline, gutters and ice barrier, which Bozeman's criteria require on roofs.
Screens and smoke
Some summers bring wildfire smoke and mosquitoes, and owners who add a roof often want screens next. That changes the design, so mention it at the first visit.
Near trees and grass
If the lot backs onto timber or open grass, ask about a noncombustible roof surface and how needles and leaves will be kept out of corners and gutters. The deck guide covers Gallatin County's wildfire advice.
We don't quote prices. A builder prices a deck after walking the site, measuring, checking the house wall and the ground, and talking through materials with you. Any number you hear before that visit is a guess.
Where we connect you with help
Common questions
Does a pergola need a permit in Bozeman?
It depends on size, whether it attaches to the house and whether it has a solid roof. Check with the City of Bozeman Building Division, or with Belgrade if you live there.
Will a deck roof hold Bozeman snow?
It has to be designed for it. Ask what snow load the design uses; the city's criteria list 46 psf ground and 41 psf roof snow loads.
Related services
More background: Bozeman deck guide.
Planning a deck before the next building season?
Call the number above and we'll put you in touch with a deck builder who works in your part of the Gallatin Valley.