A level, well-drained, compacted site is what keeps foundations, slabs and driveways from cracking and settling. We clear, cut, fill, compact and grade lots for new homes, shops, driveways and landscaping across the valley.
Site Preparation and Grading in Boise
Most of the problems people call us about later start with poor site prep. A garage slab that cracked the first winter. A patio that slopes toward the house. A backyard that turns into a pond every spring. A gravel pad that sank under an RV. In most of those cases, the ground underneath wasn't cleared, compacted or graded the right way before the work went on top.
We do site preparation and grading for homeowners, builders and businesses in Boise, Meridian, Nampa, Eagle, Kuna, Star, Caldwell and Middleton. Jobs run from leveling one backyard to preparing a full lot for a new home or shop.
What Is Site Preparation?
Site preparation is all the groundwork that happens before something gets built. It starts with a walk of the lot to see what's there, how water moves across it and what kind of soil sits under the surface. It usually includes:
- Clearing brush, trees, stumps, old fences and debris. See land clearing.
- Demolition of old slabs, sheds or structures. See demolition.
- Stripping topsoil and stockpiling it for later.
- Cut and fill to bring the site to the right elevation, taking soil off high spots and placing it in low spots.
- Compaction in layers so the ground doesn't settle later. See compaction.
- Base material like gravel for slabs, driveways and pads.
What Is Grading?
Grading is shaping the ground to the elevations and slopes the job needs. On new construction those numbers come from the plans and the surveyor's stakes. In an existing backyard they mostly come from the house, since the ground has to fall away from it. There are two main stages.
Rough grading
This sets the general shape of the lot. On new construction it happens before and after the foundation, so the building pad is level and the lot drains the right way. Most of the dirt on a job gets moved during rough grading, and it's the stage where soft spots, buried debris and wet areas show up and get fixed.
Finish grading
This is the final shaping before landscaping, sod, pavers or concrete. It smooths the surface, sets the final slopes and gets the topsoil where it needs to be. Finish grade also has to leave room for what goes on top. Sod needs the soil set a little below the sidewalk so the grass ends up flush, and pavers need depth for base and sand.
Why Drainage Matters So Much Here
The Treasure Valley is dry most of the year, but water still causes most of the damage we see. Spring rain, snowmelt and irrigation all add up, and a lot of the valley has clay or caliche soil that doesn't drain well. When water sits against a foundation, it can lead to wet crawlspaces, settling and cracked concrete.
The building code calls for the ground to fall at least 6 inches within the first 10 feet away from a house. Many older homes in Boise and Nampa have lost that slope over the years as landscaping got added and soil settled. Regrading the yard is often the fix. When grading alone isn't enough, drainage excavation or a French drain can carry the water away.
Soil and Terrain in the Valley
- Caliche and hardpan around Meridian, Nampa and Kuna are hard to cut and don't let water through, which makes drainage design more important.
- Clay soils expand when wet and need careful compaction at the right moisture.
- River gravel and cobble near the Boise River drain well but can be tough to fine grade.
- Foothills lots in North Boise and parts of Eagle mean working with slopes, cut banks and sometimes retaining walls.
What to Decide Before Grading Starts
A few choices made early save rework later. Know what the finished surface will be (lawn, gravel, pavers or concrete), since each needs a different depth below final grade. Decide where water should leave the lot. Put sprinkler and conduit sleeves under future driveways and walks before base goes down, because adding them later means cutting concrete. If a pour or sod delivery is booked, share the date so grading can finish ahead of it.
Common Site Prep and Grading Projects
- New home sites and site cuts for new homes
- Pads for shops, pole barns and garages
- Gravel driveways, RV pads and driveway excavation
- Backyard leveling and grading for landscaping
- Regrading to fix drainage around a house
- Prep for patios, sport courts and sheds
- Paving job site preparation for asphalt and concrete
Permits and Regulations
Small regrading around a home usually doesn't need its own permit, but larger cut and fill, work on hillside lots, and anything that changes how water leaves your property can require a grading permit from the city or county. Projects that disturb an acre or more generally need construction stormwater permit coverage. Some subdivisions in Meridian, Eagle and Star also need HOA approval before you change the grade. We can help you figure out what applies before work starts.
Weather and Timing
Grading works best when the soil isn't too wet or too dry. Spring and fall rains can make clay soils too soft to compact, and frozen winter ground can't be graded or compacted well. Summer is the busiest season. If you have a deadline, like a concrete pour or a sod delivery, call early.
What Site Prep and Grading Costs
Price depends on the size of the area, how much soil has to be cut, filled or hauled, the soil type, whether base gravel is needed, and access. A backyard leveling job and a full new home site are very different jobs. We give free estimates and explain what goes into the number.
Why Hire Ultimate Excavation LLC
We're an Idaho registered contractor (RCE-65836) based in Caldwell with a 5.0 rating on Google. One customer had us build a stone block retaining wall and drainage around their home and said we "paid attention to all the small details." That's what grading needs. Call (208) 697-2429 or request a free estimate.
