Deck building questions, answered

General questions

Which Treasure Valley cities require a permit for a deck?

All of them set rules, but the thresholds differ. Boise and Nampa require a permit for a deck more than 12 inches above grade. Meridian requires one for decks over 200 square feet, attached to the house, more than one story, or serving an exit door. Eagle requires permits for decks attached to a structure, and Caldwell says decks need separate permits and inspections. The Boise deck permit guide is the most detailed starting point.

Who pulls the deck permit — me or the contractor?

Either can, depending on the arrangement. Boise lets homeowners pull permits for work on their own primary residence. The written estimate should state plainly who is pulling the permit and who schedules the inspections, so nobody assumes the other person did. City-specific steps are in the Meridian, Nampa, Eagle and Caldwell permit guides.

When does deck building season start and end in the Boise area?

Footing work runs most comfortably from spring through fall. NOAA's 1991–2020 normals for the Boise airport put the median last spring freeze on April 24 and the median first fall freeze on October 21. Framing, decking, railing and repair work stretch well past those dates on dry days, so the season for finishing a deck is longer than the season for starting one.

When should I start planning a deck I want finished by summer?

Late winter. Design, permit review and any HOA approval usually take longer than the construction itself, and they can all happen while the ground is still frozen. Starting the design in January or February leaves room for a revision or two and lets footings go in soon after the spring thaw. Our guide to the best time to build a deck in Boise lays out a month-by-month plan.

What changes when a deck is built between November and March?

Mostly the footings and the finish. December and January average 25.2 and 25.5 nights at or below freezing at the Boise airport, so digging is slower and fresh concrete has to be protected while it cures. Composite boards get end gaps set for the cold. Wood stains need warm, dry days, so a wood deck built in winter usually gets its first finish in spring.

How do I choose between composite, PVC and wood decking?

Start with how much upkeep you'll accept and how much sun the deck gets. Wood costs least up front and needs a stain cycle; capped composite needs washing, not staining; PVC is the lightest and most moisture-resistant at the highest board price. In full sun, color matters as much as material. The composite vs. wood and composite vs. PVC guides compare them in detail.

What happens at the on-site estimate?

We measure the deck area and its height above grade, look at the house wall where a ledger would attach, check access for equipment and materials, and note sprinkler lines and utilities. On an existing deck we also probe the framing. Then we talk through how you'll use the deck, material options and budget. Afterward you receive a written, line-item scope that separates footings, framing, decking, railing, stairs and permit responsibility.

What should I have ready before a deck estimate?

Anything that limits the design: your HOA's architectural guidelines, a plat or site plan showing property lines and easements, and the permit or plans from any existing deck. Photos of decks you like help, as does a rough budget range and a list of how you'll use the space — dining, a hot tub, shade, stairs to the yard. If you're comparing materials, our deck cost calculator gives a quick starting range.

How does a deck project work from first visit to final walkthrough?

In five stages: a site visit, a design with a written line-item scope, permit and HOA approvals, construction (footings, framing, decking, railing and stairs), and a final walkthrough that includes any required final inspection. Construction starts only after the approvals are in hand. Our process page explains what happens at each stage and what we need from you along the way.

Does HOA approval replace the city permit, or the other way around?

Neither. The HOA enforces its covenants on size, placement, materials and colors; the city enforces the building code and setbacks. A deck can pass one review and fail the other, so both approvals are needed before construction starts. Submitting both at the same time keeps one review from waiting on the other. The HOA deck approval guide covers what architectural committees typically ask for.

Does my deck need an engineer?

Most decks can be built from the code's prescriptive span and footing tables. Engineering comes in when a design goes beyond them: hot tubs and other heavy concentrated loads, a roof over the deck, very tall posts or long spans, and — in Boise — most stand-alone pergolas and gazebos, which the city treats as pole construction. The deck snow load resource explains how local loads affect sizing.