Do I need a permit for a covered deck in Boise?

Yes, for any cover attached to the house, regardless of size, and for the deck itself if it's more than 12 inches above grade. Free-standing pergolas and gazebos over 200 square feet also need a permit and are usually treated as structures requiring an Idaho-licensed engineer. Covers that meet the city's patio cover policy may not need engineering.

What snow load does a deck cover need in Boise?

At least 25 psf, the minimum roof snow load in Boise's adopted design criteria, and more where snow can drift or slide onto it from a taller roof. Higher-elevation subdivisions may have higher ground snow loads. The cover's posts and footings are sized for the roof load, separate from the open-deck framing below.

Is a pergola or a solid roof better for Boise summers?

A solid roof gives full shade and keeps rain and snow off, but it needs more structure and a permit. A pergola gives partial, moving shade, is lighter and lets snow through, and shade cloth can increase coverage in July. Louvered aluminum covers sit in between, with adjustable shade. Orientation matters: west-facing decks benefit most from full cover.

Can I add a cover to my existing deck?

Often, but not by bolting posts to the deck framing. A cover needs its own posts on footings sized for roof loads, a proper connection to the house, and a permit. Existing decks sometimes have room to place cover posts outside the deck footprint or through it to new footings. An on-site look at the ledger and framing decides the approach.

How do I keep a covered deck from blocking light into the house?

Raise the roof height where it meets the house, use a lower pitch, or choose a louvered cover or pergola over the windows nearest the deck. Skylight panels in a solid roof are another option. Draw the cover on the house elevation before deciding, because the roof's attachment height is limited by windows, doors and the house roof line.

Covered Deck Ideas for Boise Backyards

Why cover a deck in Boise?

Heat, mostly. NOAA's 1991–2020 normals put Boise's average July high at 92.7°F, with about 55 days a year at 90°F or above. A west- or south-facing deck can be unusable from mid-afternoon to sunset all summer, and dark decking gets hot underfoot. Shade turns that deck back into a room. A roof also keeps snow off the doorway in winter and lets furniture stay out through spring showers.

Covered deck with a gable roof tied into the house, ceiling fan, and outdoor seating in afternoon shade — Illustration for ideas only — not a Valley Decks project photo.

Which cover type fits your deck?

Cover types compared for Boise conditions
Cover type	Shade	Snow	Wind	Permit notes
Solid roof tied into the house	Full	Designed for at least 25 psf roof snow plus drift where it meets the house	Roof and posts designed for uplift	Boise: attached patio covers need a permit at any size
Free-standing solid roof	Full	Same roof snow minimum; own posts and footings	Needs lateral bracing or engineered posts	Boise: stand-alone structures over 200 sq ft need a permit and usually engineering
Louvered aluminum cover	Adjustable	Manufacturer rates snow load; louvers typically closed in winter	Manufacturer wind rating; check against local design wind	Treated as a patio cover; ask for the manufacturer's engineering to support the permit
Open pergola, with or without shade cloth	Partial	Little snow retained unless covered	Shade fabric adds wind load; remove in winter	Size and attachment decide the permit, as above

Our covered decks and pergolas service covers each option in more detail, and the covered deck cost guide has sourced price ranges.

Design the roof for snow, not just shade

Boise's adopted design criteria set the ground snow load at 20 psf and require a roof snow load of at least 25 psf. Where a cover meets a taller house roof, snow can drift or slide onto it, and Boise's local code amendments address drifting. Two rules keep a covered deck honest:

The cover's posts carry roof load to their own footings. The open-deck footing table assumes 40 psf of deck load, not a roof on top, so footings under cover posts are sized for both.
Don't hang a cover off the deck's rim joist. The deck framing wasn't designed for it.

Our deck snow load guide explains the numbers. Boise's Residential Patio Cover Construction Policy lets covers that meet it skip engineering; larger or unusual designs need an Idaho-licensed engineer.

Timber pergola over a composite deck with heavy posts on concrete footings — Illustration for ideas only — not a Valley Decks project photo.

How much does wind matter for pergolas?

Wind lifts and racks covers. Boise's adopted IRC criteria list a design wind speed of 90 mph; Star, a few miles west, publishes 115 mph for risk category II structures. Those figures come from different design maps and aren't directly comparable, but both say the same thing for a cover: posts need real connections at the footing, beams need hardware at the post, and a roof needs to be tied down against uplift.

Use structural post bases and post-to-beam connectors rather than toenails.
Brace tall free-standing pergolas with knee braces or engineered moment connections.
Treat shade cloth and retractable canopies as sails; take them down for winter storms.
Ask louvered-cover suppliers for the product's wind and snow ratings in writing.

Permits for covers around the valley

Boise requires a permit for any attached patio cover, whatever its size, and treats free-standing pergolas and gazebos over 200 square feet as structures that usually need engineering. Meridian lets a detached shade structure under 200 square feet go without a building permit but requires a Residential Patio Cover permit and setbacks above that. Our Boise deck permit guide and Meridian deck permit guide cover the details.

Details that make a covered deck pleasant

Light and power

Ceiling fans, heaters and recessed lights are why many people cover a deck. In Boise, low-voltage lighting doesn't need an electrical permit; line-voltage lights, fans and outlets do. Plan wiring before the ceiling goes on.

Low-voltage step and post-cap lights on a deck at dusk — Illustration for ideas only — not a Valley Decks project photo.

Water management

A solid roof concentrates rain and snowmelt. Add a gutter on the cover's low edge and route downspouts away from deck posts and footings, and flash the roof-to-wall joint at the house.

Materials under the roof

Decking under a cover stays cooler and dries slower. Capped composite holds up well in that shade-and-damp mix; wood under a cover needs airflow to dry. Our decking for full sun guide covers the uncovered portions.

Planning a covered deck

Design the deck and cover together so the posts, footings and beams line up. If a hot tub is going under the roof, read our hot tub deck ideas first, then request an estimate.

Frequently asked questions

Do I need a permit for a covered deck in Boise?: Yes, for any cover attached to the house, regardless of size, and for the deck itself if it's more than 12 inches above grade. Free-standing pergolas and gazebos over 200 square feet also need a permit and are usually treated as structures requiring an Idaho-licensed engineer. Covers that meet the city's patio cover policy may not need engineering.
What snow load does a deck cover need in Boise?: At least 25 psf, the minimum roof snow load in Boise's adopted design criteria, and more where snow can drift or slide onto it from a taller roof. Higher-elevation subdivisions may have higher ground snow loads. The cover's posts and footings are sized for the roof load, separate from the open-deck framing below.
Is a pergola or a solid roof better for Boise summers?: A solid roof gives full shade and keeps rain and snow off, but it needs more structure and a permit. A pergola gives partial, moving shade, is lighter and lets snow through, and shade cloth can increase coverage in July. Louvered aluminum covers sit in between, with adjustable shade. Orientation matters: west-facing decks benefit most from full cover.
Can I add a cover to my existing deck?: Often, but not by bolting posts to the deck framing. A cover needs its own posts on footings sized for roof loads, a proper connection to the house, and a permit. Existing decks sometimes have room to place cover posts outside the deck footprint or through it to new footings. An on-site look at the ledger and framing decides the approach.
How do I keep a covered deck from blocking light into the house?: Raise the roof height where it meets the house, use a lower pitch, or choose a louvered cover or pergola over the windows nearest the deck. Skylight panels in a solid roof are another option. Draw the cover on the house elevation before deciding, because the roof's attachment height is limited by windows, doors and the house roof line.

Sources

Last reviewed October 15, 2026.

Covered Deck Ideas That Work in Boise