Do you need a permit to coat a garage floor in Boise?
In Boise, grinding, crack filling and coating an existing garage floor counts as finish work, and finish work doesn't need a building permit. Boise City Code 9-1B-8, the city's version of Section R105.2 of the 2018 International Residential Code, lists "painting, papering, tiling, carpeting, cabinets, counter tops, and similar finish work" as work exempt from permit, and the city's homeowner guide says the code exempts interior work like painting and floor covering. You would need a permit if the job turns the garage into living space, adds or moves walls, pours a new slab more than 30 inches above the ground next to it, or adds or changes wiring or plumbing. If your project goes beyond a coating, call the Boise Building Division at (208) 608-7070 to confirm.
Checked against Boise code in November 2026. See the rules for every Treasure Valley town.
Grinding dust and rinse water in Boise
Boise City Code 10-6-2 makes any discharge to a storm drain that isn't entirely stormwater a violation, and the city counts streets, curbs and gutters as part of the storm drain system. Washing a car at home is on the allowed list in 10-6-2-6, but grinding slurry and coating rinse water are not, so they shouldn't be hosed into the gutter.
Getting the garage ready for us? Sweep or vacuum it out instead of hosing it into the street.
Winter roads and your garage floor
Boise's local streets are managed by the Ada County Highway District (ACHD), while interstates and state highways in Boise are handled by the Idaho Transportation Department (ITD). ACHD says it sprays liquid magnesium chloride on priority roads before storms so snow and ice don't bond, and spreads road salt and a salt and sand mix.
All of that rides into the garage on your tires and melts on the slab. The Federal Highway Administration says chemical deicers can make freeze and thaw damage to concrete worse, that surface scaling is the most common damage they cause on slabs, and that magnesium chloride and calcium chloride raise the most concern. A coated floor gives the melt a sealed, non porous surface to sit on instead of bare concrete, so you can squeegee it out the door.
New build in Boise?
Polyrez, the coating system we use, says new concrete needs to cure at least 28 days before it’s coated, and the slab, the air and the material all need to be between 50°F and 80°F while it goes down. The Federal Highway Administration also recommends letting new concrete dry at least 30 days before deicers hit it. Tell us your closing date and we’ll plan the install around it.
Working near Boise
We also coat floors in Meridian, Garden City and Eagle. See every town we cover.