New deck building in Bozeman
A deck sized for how you'll use it and framed for the weight of a Gallatin Valley winter.
In Bozeman, the snow load is what shapes a deck before anything else. The city's design criteria list a deck live (snow) load of 46 pounds per square foot. A builder sizes joists, beams, posts and footings to carry that, so a deck here often has heavier framing or more footings than the same deck would somewhere milder.
What goes into a well-built deck?
- Footings below frost. Bozeman's criteria call for 36 inches to the bottom of the footing for one-story buildings and 48 inches for two-story ones. Your builder should confirm with the building department which depth applies to your deck.
- A ledger that's bolted and flashed. An attached deck hangs from a ledger fastened into the house framing, with flashing to keep water from running behind it.
- Framing sized for snow. Joists and beams chosen for the span and the load, with hangers and fasteners rated for treated lumber.
- Lateral connections. Bozeman is in Seismic Design Category D0, and the deck-to-house connection should keep the deck from pulling away.
- Boards, guards and stairs. The surface plus railings and steps built to the 2021 International Residential Code that Bozeman and Belgrade use.
Which deck boards are common here?
| Material | Why people pick it | Trade-off |
|---|---|---|
| Treated pine | Lowest starting cost; also the usual framing lumber | Checks and grays quickly in high-altitude sun without finish |
| Cedar | Warm color and a natural look | Softer surface; needs regular finish to hold its color |
| Composite or PVC | Little upkeep, no staining | Higher upfront cost; see composite decks |
New houses, bare back doors
Many homes built in Bozeman's newer subdivisions and around Four Corners and Belgrade were finished with a patio door and little else. A first deck there is usually simple to plan, but check your HOA covenants for size, material and color rules, and note where utilities and window wells sit before footings are laid out.
Sloped lots and views
Lots on the south side of town, toward the Gallatin Range, and in the foothills often fall away from the house. A deck that's a step down at the door can be well over the 30-inch guard height at the far end. Taller decks need bigger footings, bracing, and a stair layout that lands somewhere useful.
Decide these early
- Grill, hot tub, or a big table? Heavy loads need to be planned in.
- Which way it faces, and where shoveled snow will go
- Whether you may add a roof later, so footings can be sized now
- Gates for kids or dogs, and where the stairs land
What affects the price?
- Size, height and layout
- Board and railing materials
- Number of footings, levels and stairs
- Removing an old deck, permit work and site access
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
How deep do deck footings go in Bozeman?
The city's design criteria list 36 inches to the bottom of the footing for one-story buildings and 48 inches for two-story buildings. Have your builder confirm the depth for your deck with the building department.
Why does my deck need such heavy framing?
Bozeman's design criteria set a 46 psf deck live (snow) load, so the framing has to carry snow sitting on the deck as well as people and furniture.
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.