Concrete in Nampa, on the Canyon County side of the line
Nampa is the valley's second-largest city at about 127,000 people. It's next door to Meridian but in Canyon County, so ACHD's rules stop at the line and Nampa's own apply.
Nampa's building department publishes clear answers on concrete. A building permit is required for sidewalks, slabs and driveways more than 30 inches above adjacent grade, and for retaining walls 4 feet or taller. All buildings must have a foundation, and the frost depth is 24 inches, the same as Meridian's. For accessory buildings under 600 square feet, Nampa allows a 12-inch-wide by 12-inch-deep footing. So an ordinary driveway or patio at grade doesn't need a City permit, but a shop, a garage or a large shed needs a real foundation drawn and inspected.
Because Nampa is in Canyon County, ACHD doesn't permit work in its streets. Approaches, curb cuts and sidewalks in the right-of-way are permitted by the city, or by a highway district on some outlying roads, and we confirm which at the estimate. The soil survey maps mostly Power and Purdam silt loams around Nampa. Power is deep with no hardpan, while Purdam has its duripan at about 24 inches, so footing digs vary from lot to lot. Nampa's mix of older homes, new subdivisions on the edges and acreage parcels toward Lake Lowell means our work here ranges from replacing worn driveways to pouring long drives and shop slabs on larger lots.
What we do in Nampa
Driveways and patios
Flatwork at grade under Nampa's 30-inch threshold, on compacted gravel with air-entrained concrete.
Shop and garage foundations
Footings to the 24-inch frost depth, or the 12-by-12 footing Nampa allows under 600 sq ft.
Right-of-way permits
Approaches and sidewalks permitted with the city or the highway district that owns the road.
Acreage driveways
Long drives and turnarounds for larger lots toward Lake Lowell and the edges of town.
RV pads
Six-inch reinforced pads for trailers, boats and motorhomes.
Repair and removal
Lifting, crack repair and removal for older Nampa slabs.
Neighborhoods and roads we cover
- Downtown Nampa
- North Nampa
- South Nampa
- Karcher Road
- Midland Boulevard
- 12th Avenue
- Garrity Boulevard
- Lake Lowell Avenue
- Middleton Road (Nampa)
- Northwest Nazarene University area
- Idaho Center area
- Greenhurst Road
Concrete services in Nampa
- Driveways, builder driveway replacement, approaches and sidewalks, RV and parking pads
- Patios, stamped and decorative concrete, walkways and steps, sport courts
- Shed and shop slabs, foundations and footings
- Repair and leveling, removal
Questions from Nampa homeowners
Does Nampa require a permit for a patio?
Not for a slab at grade. Nampa requires one for slabs, sidewalks and driveways more than 30 inches above adjacent grade.
What footing does a shed need in Nampa?
All buildings need a foundation. Accessory buildings under 600 square feet may use a 12-inch by 12-inch footing; bigger buildings go to the 24-inch frost depth.
Who permits my approach in Nampa?
Not ACHD, which covers Ada County only. In Nampa it's the city or, on some outlying roads, a highway district. We check before we quote.
Do you cover the whole Nampa area?
Yes, from downtown to the subdivisions on the edges and the acreage toward Lake Lowell.
Nearby: Caldwell · Ten Mile · Middleton · Kuna · full service area