Concrete in Kuna, where the hardpan and the rock are close to the surface
Kuna added about 4,800 people in a single year. It also sits on some of the shallowest ground in the valley, with hardpan around 19 inches and bedrock not far below.
Kuna grew about 14 percent in one year, to roughly 38,500 people, and the new subdivisions and acreage lots south of Meridian keep coming. The city adopts the residential code as the Idaho Building Code Board adopts it, with no local amendments, so the concrete rules match the statewide ones. Kuna is in Ada County, which means ACHD permits work in the streets, the same as in Meridian. Kuna-Meridian Road is State Highway 69, under the Idaho Transportation Department.
The soil is what sets Kuna apart. The survey's most common soil here is Colthorp silt loam, with a duripan at about 19 inches and bedrock at about 28 inches. Elijah silt loam on a bedrock substratum, the next most common, has its hardpan around 31 inches and rock at about 43 inches. A 24-inch frost footing can mean cutting into cemented hardpan and sometimes stopping on rock, which is fine bearing but slow digging. We dig test holes at the estimate for any shop, garage or footing so the excavation is priced honestly. Flatwork is simpler, though shallow hardpan can hold water under a slab after a heavy irrigation season, so we grade carefully and keep the base drained. Kuna's larger lots mean long driveways, RV pads, shop slabs and turnarounds for trucks and trailers.
What we do in Kuna
Test holes first
Hardpan and bedrock depth checked at the estimate for every footing job.
Footings through hardpan
Trenches cut to the 24-inch frost depth through the duripan, or adjusted where rock is shallow.
Shop and garage slabs
Monolithic or footing-and-slab foundations for shops on larger lots.
Long drives and turnarounds
Driveways and truck-and-trailer turnarounds for acreage parcels.
RV pads
Six-inch reinforced pads, laid out to the setbacks and your HOA.
ACHD and ITD permits
ACHD for local streets; Idaho Transportation Department on Kuna-Meridian Road.
Neighborhoods and roads we cover
- Downtown Kuna
- Kuna-Meridian Road (SH-69)
- Ten Mile Road (Kuna)
- Linder Road (Kuna)
- Deer Flat Road
- Hubbard Road
- Columbia Road
- Lake Hazel Road (Kuna)
- Kuna-Mora Road
- Swan Falls Road
- Cloverdale Road (south)
- Locust Grove Road (Kuna)
Concrete services in Kuna
- 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 Kuna homeowners
Why does digging a footing cost more in Kuna?
The hardpan is shallow, about 19 inches in the common Colthorp soil, with bedrock around 28 inches. Reaching a 24-inch frost depth means cutting through it. We price it from a test hole so there's no surprise.
Do I need a permit for a driveway in Kuna?
Kuna follows the state's residential code without local amendments, which exempts driveways and sidewalks. Approach work in the right-of-way needs ACHD's permit.
Can you pour a shop slab on an acreage lot?
Yes. A 30-by-40 shop slab with frost footings typically runs $12,500 to $18,500 before hardpan excavation, which we price from the test hole.
Who permits work on Kuna-Meridian Road?
It's State Highway 69, so the Idaho Transportation Department. Most other Kuna streets are ACHD's.
Nearby: South Meridian · Nampa · Boise · Ten Mile · full service area