What Does Site Preparation Include?
Site prep is the work that happens between a raw piece of land and the first concrete pour or foundation. It's rarely a single service — most site prep jobs combine clearing, demolition, grading, and hauling in sequence. The end goal is a level, compacted, drained site that's ready for your builder, concrete contractor, or landscaper.
- Vegetation and brush clearing — removes existing growth before grading begins
- Structure demolition and removal — old buildings, sheds, concrete slabs cleared from the footprint
- Debris and trash hauling — existing dumped material, construction debris, or overgrowth removed
- Rough grading — bulk earthmoving to establish pad elevation, drainage slope, and overall site shape
- Finish grading — final surface tolerance work before base rock or concrete
- Erosion control installation — silt fence, straw wattles, or hydroseeding per stormwater requirements
- Utility trench coordination — trenching for electric, water, sewer, or gas rough-in to support contractors
- Access and driveway prep — establish entry route, turn radius, and delivery access for construction phase
What Does Site Prep Cost in Northern California?
A site prep job's cost is driven by what needs to come off the site and how much earthmoving the target grade requires. Light clearing with minimal grading on a flat lot is at the low end. A sloped lot with structures to demo and significant cut/fill work is at the high end.
- Typical residential ADU site prep: $5,000–$15,000 for clearing, rough grading, and access work on a standard lot
- New custom home site prep (0.5–1 acre): $10,000–$25,000 depending on slope, clearing density, and earthwork volume
- Rural parcel site prep (1–5 acres): priced by scope — typically $15,000–$50,000+ for full clearing, grading, and access
- Structure removal included: add $2,500–$10,000+ depending on what's on site
- Erosion control (SWRCB CGP): required on sites over 1 acre disturbed area; add $1,500–$5,000 for SWPPP and installation
- Utility trench work: $5–$15 per linear foot depending on trench depth and width
- Compaction testing and geotech: typically $800–$2,500 for residential pads requiring sign-off
Site Prep for ADUs — What the Sequencing Looks Like
ADU site prep is one of our most common project types in the Sacramento area. The sequence matters — clearing and demo happen first, then grading, then utility rough-in before the concrete contractor arrives. Getting the order right prevents double work and delays.
- Step 1: Confirm finished floor elevation (FFE) with the architect or building department — grading references this
- Step 2: Clear vegetation and remove any existing structures or debris from the pad footprint
- Step 3: Rough grade — establish pad elevation, drainage slope away from the structure, and access route
- Step 4: Utility trench rough-in — electric, water, sewer stubs placed before pad is compacted and finished
- Step 5: Compaction to spec — typically 95% relative density under the slab per geotech requirements
- Step 6: Finish grade — surface to tolerance for base rock and concrete placement
- Step 7: Erosion control — silt fence and inlet protection if construction phase extends into rain season
- Common ADU site prep mistake: skipping utility trench coordination and having to re-excavate after grading
Permits and Stormwater Requirements for Site Prep
Site prep projects often trigger multiple permit requirements — grading permits for earthwork, stormwater permits for area disturbed, and building permits for any new construction that follows. The biggest surprise for first-time builders is stormwater: any project disturbing more than 1 acre needs SWRCB Construction General Permit coverage before a shovel goes in the ground.
- Grading permit: required in most jurisdictions for earthmoving above threshold (typically 50–100 cy)
- SWRCB Construction General Permit (CGP): required for projects disturbing 1 acre or more — SWPPP must be filed
- SWPPP preparation: typically handled by a QSD (Qualified SWPPP Developer) — we can provide referrals
- Building permit: required for the structure being built — separate from grading permit
- Demolition permit: required if existing structures are being removed as part of site prep
- SMAQMD notification: required if structures being demo'd were built in 1980 or earlier
- Utility notifications: USA North 811 call required at least 2 business days before any excavation
Common Site Prep Mistakes That Delay Construction
Site prep errors rarely show up immediately — they surface when the concrete contractor, building inspector, or first rain arrives. These are the mistakes we see most often on projects that were rushed or poorly coordinated.
- Grading without confirming FFE: wrong pad elevation requires re-grading after permits are issued
- Skipping utility trench coordination: trades cut into finished grade to run their lines
- No erosion control on rain-season projects: stormwater violation, soil movement, and rework
- Insufficient compaction: slab cracking, settling, and failed inspections after concrete is poured
- Clearing without permit check: heritage trees removed, oak ordinance violation, or code penalty
- Poor drainage slope: water pools against foundation — fix after-the-fact is expensive
- Starting without USA 811 call: hitting a buried utility line delays the job and creates liability
Related Services
Grading
Prepare land for pads, driveways, drainage, ADUs, shops, garages, and future construction.
Pad Preparation
Level, usable areas prepped for ADUs, shops, garages, and outbuildings.
Land Clearing
Clear overgrown lots, brush, vegetation, debris, small trees, and access areas.
Excavation
Dirt removal, trenching, small excavation, rough grading, and site support work.
Related guides
Site Prep Guides
ADU Pad Preparation: Clearing, Grading & Access
What it takes to turn an existing backyard or lot into an ADU-ready pad.
Land Clearing Guides
Land Clearing vs Grading: What's the Difference?
Clearing removes what's on the ground. Grading shapes the ground itself. Here's how they fit together.
Frequently asked questions
How much does site preparation cost in Northern California?
A residential ADU site prep typically runs $5,000–$15,000 for clearing, rough grading, and access work on a standard lot. Larger lots, sloped terrain, existing structures to demo, or significant earthwork push the range to $10,000–$25,000 and beyond for custom home sites. Rural multi-acre parcels are scoped individually. The biggest cost variables are what needs to come off the site and how much dirt needs to move.
What is the difference between site preparation and grading?
Grading is one component of site preparation. Site prep is the full sequence: clearing vegetation, removing structures or debris, grading the land to the target elevation, installing erosion controls, coordinating utility trenches, and handing off a buildable site. If the land is raw but already clear and roughly level, grading alone may be sufficient. If there's clearing, demo, hauling, and multiple sequenced tasks needed, that's full site prep.
Do I need a permit for site preparation?
Usually yes, depending on scope. Grading permits are required for significant earthmoving in Sacramento, Placer, El Dorado, and Yolo counties. Projects disturbing more than 1 acre require SWRCB stormwater coverage. If structures are being removed, a demolition permit is required. If the existing structures were built before 1980, SMAQMD notification is also required. Confirm requirements with your county building department early — lead times on permits affect the construction schedule.
How long does site preparation take?
A typical ADU site prep — clearing, rough grading, utility trench, and finish grade — takes 3–7 days of active equipment work. The construction schedule bottleneck is usually the permit timeline: grading permits typically take 2–4 weeks, and SWRCB CGP can take 2–6 weeks if a SWPPP needs to be prepared. Starting the permit process early is the most effective way to keep the project on track.
Can site preparation and construction happen at the same time?
Some overlap is fine — foundation excavation and concrete work can proceed on the prepared portion of the site while access or utility work continues. But grading, especially finish grading, needs to be complete before concrete is placed. Utility trenches need to be stubbed in before the pad is compacted and the concrete contractor arrives. Sequencing a pre-construction meeting between site prep and the building contractor prevents most conflicts.