A garage floor in Nampa takes car weight, dripping snowmelt, road salt and dropped tools for decades. When it's cracked, heaved, pitted or sloping the wrong way, we break it out and pour a new one; when you're building a new garage, we pour the slab to suit what it will hold.
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Common reasons to replace rather than repair: slabs broken into separate pieces, sections that have dropped at the door, surfaces scaled by salt brought in on cars, and floors that drain toward the house instead of out the door. Replacement means saw-cutting at the walls and door, breaking out and hauling the old concrete, fixing the base, and pouring new with a slope toward the door. If the slab is intact but has settled, lifting it may be cheaper; see our concrete leveling options first.
HomeGuide's 2026 guide describes most two-car garages as 20-by-20 to 24-by-24 feet, poured in reinforced concrete 4 to 6 inches thick, at $2,400 to $6,900 installed nationally. We size thickness to the heaviest thing that will sit on the floor: a lifted truck, a car lift, a loaded trailer or a workshop full of machines. A vapor barrier goes under floors that will be enclosed and finished.
The City of Nampa requires a building permit to build a garage, carport or other attached structure. For accessory buildings under 600 square feet, the City doesn't require a foundation down to the 24-inch frost depth, but it does require a foundation at least 12 inches wide and 12 inches below grade. Larger buildings go to frost depth. We pour to the approved plans and inspections, and the permit itself is pulled by the registered contractor or the homeowner doing the work.
Cars carry deicing salt and slush into the garage all winter. Salt water soaks into the surface and, through freeze-thaw cycles, can flake the top off concrete that isn't air-entrained. We pour garage floors with a mix suited to that exposure and finish them to drain. If a new floor goes in during the fall, keep salty slush off it the first winter, per the Ohio Ready Mixed Concrete Association.
HomeGuide lists epoxy floor coatings at $4 to $10 per square foot and sealing a 360-square-foot garage at $360 to $1,080, with penetrating siloxane or silicate sealers giving a natural look and epoxy or polyaspartic coatings lasting longest. If you plan to coat the floor, tell us at the site visit so the surface is finished to take it. More on sealing.
Detached shops, pole barns and equipment buildings have their own considerations, from truck access inside the frame to apron slabs at the big doors. Those are covered on our pole barn and shop slabs page.
Send the garage size, what's wrong with the floor now, and what you park or store in it. Call anytime at (208) 505-4111 or send the Nampa Quote Request form, and we'll set up a site visit and an itemized written quote.
Call (208) 505-4111Email: info@nampaconcreteworks.com
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