Garage floor coating rules in the Treasure Valley, town by town

Permit rules at a glance

A permit can still come into play if the job is more than a coating, like turning the garage into living space, adding a floor drain, or new wiring or plumbing.

Town by town

Meridian

No, not for the coating itself. Meridian treats painting, flooring and similar finish work as exempt under the 2018 International Residential Code it adopts in City Code 10-1-1, but call Building Services at (208) 887-2211 to confirm if the job includes structural, plumbing or electrical work. Meridian's nuisance code makes it illegal to create a nuisance in streets, gutters or storm drains, and it counts paint, oil and fuel as nuisance materials (Meridian City Code 4-2-1 and 4-2-4). Garage floor coatings in Meridian

Boise

No, not for coating an existing slab. Boise City Code 9-1B-8 exempts painting and similar finish work from building permits, but turning the garage into living space or adding wiring or plumbing does need permits, so call (208) 608-7070 if your project includes more than the coating. 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. Garage floor coatings in Boise

Nampa

No, not for a coating on an existing slab. Nampa's building FAQ says painting, floor covering and similar finish work don't need a permit, but turning the garage into living space or adding plumbing or electrical does, so call (208) 468-5435 if your project includes more than the coating. Nampa City Code 8-4-7 says no one may discharge or cause to be discharged into the city storm drain system any materials or pollutants, outside a short list of allowed discharges like lawn watering. Garage floor coatings in Nampa

Kuna

No, coating alone is finish work, and Kuna follows the state's version of the International Residential Code, which exempts finish work from permits (Kuna City Code 4-1-1-1). Call the Kuna Building Department at (208) 922-5546 to confirm, especially if the job includes slab, structural, electrical or plumbing work. Garage floor coatings in Kuna

Eagle

No, not for coating an existing slab. Eagle keeps the residential code's permit exemption for painting and similar finish work, but bigger work like structural repairs, wiring or plumbing can need a permit, so call the Eagle Building Division at 208-489-8760 to confirm for your project. Eagle doesn't have a separate stormwater discharge ordinance, but Eagle City Code 4-1-4 makes it unlawful to create a nuisance in streets, gutters or storm drains, and section 4-1-1 lists paint and other hazardous materials as nuisance materials. Garage floor coatings in Eagle

Caldwell

No, a coating on an existing garage floor is treated as finish work under the 2018 IRC that Caldwell adopts, so it doesn't need a building permit. Plumbing or electrical work like a new floor drain or outlet does, so call (208) 455-3024 if you're adding anything like that. Caldwell's stormwater code (13-01-03) makes any illicit discharge to a storm drain a violation and bans non-stormwater discharges except a short list, like lawn watering or pavement wash water with no detergents and no spills. Garage floor coatings in Caldwell

Star

No. Star follows the state's version of the International Residential Code (City Code 7-1-5), which treats painting, tiling and similar finish work as exempt, and floor coating isn't on the city's list of projects that need a permit. Call the Star Building Department at (208) 286-7247 ext. 9011 to confirm. Star's development code says drainage and stormwater from private property has to stay on that property unless the city and whoever receives the water approve it in writing (Star City Code 8-4A-9). Garage floor coatings in Star

Garden City

No, not for coating an existing slab. Garden City Code 7-2-3 exempts painting and similar finish work from building permits, but structural, electrical and plumbing work still need permits, so call Garden City Building Services at (208) 472-2921 if your job includes more than the coating. Garden City Code 4-3-2 says no one may discharge, dump or dispose of spills or materials other than stormwater into the storm sewer system, and section 4-14-5 makes any non-stormwater discharge to the storm drain system a violation. Garage floor coatings in Garden City

Middleton

It's not spelled out. The building code Middleton adopts treats finish work like painting and flooring as permit exempt, but the city's own rule says to check other exemptions with the building official, so call (208) 585-3133 to confirm before your garage floor gets coated. Middleton's code (8-1-19) makes it unlawful to discharge wastewater or other polluted water into any drop inlet, like a street storm drain, or any natural outlet in the city. Garage floor coatings in Middleton

Hiring a floor coating contractor in Idaho

In Idaho, anyone who does construction work for pay has to register with the state, unless an exemption fits. The main small job exemption only covers casual or minor jobs under $2,000 for labor and materials, and it doesn’t apply when the work is part of a bigger project. Registered contractors have to show their registration number on their advertising and contracts, and you can look any contractor up on the DOPL public license search. Koala Coatings is registered as RCE-66892.

Winter roads and garage floors

The Ada County Highway District (ACHD) takes care of local streets in Boise, Meridian, Eagle, Kuna, Star and Garden City. ACHD says it sprays liquid magnesium chloride on priority roads before storms and spreads road salt and a salt and sand mix. In Canyon County each city and highway district runs its own streets: Nampa says it uses liquid magnesium chloride and salt with sand, and Caldwell reported sand, salt and liquid deicer. 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.

New concrete and cold weather

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 recommends letting new concrete dry at least 30 days before deicers are used on it.

How we checked

Every answer on this page comes from each city’s own code and official website, Idaho’s contractor registration law, ACHD, the Federal Highway Administration and Polyrez’s technical data sheets, checked in November 2026. Codes change, so call the office before you count on a rule. Questions about your floor? Call us at 208.649.0509.