Manufactured home site preparation in Northern California means clearing the lot, getting septic and utility approvals, and building a compacted, drained pad before the unit is ever ordered for delivery. The county permit usually asks for most of that paperwork up front, so the dirt work and the permit work have to be planned together.
Most people shop for the home first and think about the lot second. That's backwards. The home is built in a factory on a schedule, and the day it shows up on a truck, the pad, the access road, and the utilities need to be ready or you're paying for a stalled delivery.
Here's the order we'd work in, and where owners around Paradise, Chico, Corning, and Redding tend to get stuck.
What has to be done before the home arrives
Think of the lot as a series of gates. Each one has to clear before the next one opens.
- Clear the lot, including any fire debris, hazard trees, and stumps in the building footprint.
- Confirm the septic system or get a new one permitted.
- Pass the county's plan review and pull the building permit.
- Grade and compact the pad, and set up drainage so water leaves the site.
- Bring in utilities: power, water, and sewer or septic.
- Build the foundation system the plans call for.
- Set the home, hook up, and call for inspection.
Steps 1 through 5 are site work, and that's where most of the delays come from. The home itself is the easy part.
Start with the permit, not the excavator
A few property owners dig a pad first and apply for permits after. We'd advise against it. The county or town may want a grading and best management practice form with the application, and some want a soils compaction letter. If the pad is already built, you can end up paying to open it back up for testing.
In California, a manufactured home on private land is permitted through the city or county building department, not the state. The state housing agency (HCD) sets the installation standards, and its foundation-system rules apply when the home is set on a permanent foundation. After the local inspector signs off, the foundation compliance document gets recorded with the county. Details on that process are on the HCD foundation system page.
What the permit package looks like depends on where the parcel sits. The Town of Paradise publishes a manufactured home permit checklist that, as of its last revision, asks for state-approved foundation plans, factory floor plans, a survey of the corners, the grading form, and a fire flow test. For a burned lot it also wants proof of a passed post-fire septic evaluation or a septic repair permit, and a PG&E service application number before the building permit is issued. Parcels outside town limits go through Butte County, and the county's installation packet said that as of May 2024 it would not permit a unit built before September 1, 2008. Check that before you buy a used home. It's a lot cheaper to learn it first.
Shasta and Tehama counties have their own checklists. Call the building department and ask for the current one, because these change.
Debris, trees, and the burned-lot problem
On a lot that burned, nothing else starts until the debris program signs off. That's true for a manufactured replacement just as it is for a stick-built rebuild. If you're still at that stage, our post on clearing a fire-damaged lot before rebuilding covers the order of operations.
Two things get missed. The first is hazard trees. The Town of Paradise, for one, requires owners to remove fire-damaged trees that could fall into the public right-of-way, and it's far easier with the excavator already on site. The second is the old foundation and slab. If a burned slab sits where your new pad needs to go, it gets broken out and hauled before grading starts, not buried under fill. Buried concrete settles unevenly, and a manufactured home on uneven ground is a door that won't latch in two years.
Septic comes before the pad
This is the step that catches people. The septic system decides where the home can sit, because tanks and leach lines need set distances from the house, wells, and property lines. If the lot has an old system, a county inspector may need to evaluate it. If it doesn't, a new one needs a soil evaluation, a design, and a permit, which in Tehama County can take months.
So the pad location isn't final until the septic layout is. We've seen owners grade a beautiful pad right on top of the only workable drainfield area. Don't do that. If you're on the fence about whether an existing system is salvageable, septic work is the first thing to settle, and a site visit can save you a rework.
Building the pad
A manufactured home doesn't need as much dirt work as a custom house, but it needs the work done properly. A good pad is level, compacted, and sloped away so water doesn't pond under the home. On a flat valley parcel near Corning that's often a modest job. On a hillside lot near Paradise or Oroville, you may be cutting into a slope, which brings in retaining, drainage, and sometimes an engineer.
| Lot type | What the pad usually involves | Common complication |
|---|---|---|
| Flat valley parcel, Corning or Red Bluff | Strip topsoil, add and compact base, shape for drainage | Clay that holds water in winter |
| Foothill lot, Paradise or Oroville | Cut and fill benching, drainage control | Slope stability and runoff |
| Burned lot with old slab | Demolition, haul-off, then grading | Buried debris and uneven fill |
| Raw acreage, Anderson or Redding area | Clearing, access road, then pad | Long driveway and culvert needs |
Compaction is the part to take seriously. A pad that was only dozed flat will settle, and the piers or runners under the home settle with it. If the plan reviewer asks for a compaction letter, that means a testing firm checks the fill in lifts as it's placed, which is far easier to do while the work is underway. We explain how that testing works in our post on house pad compaction testing, and our house pad and driveway work is built around passing it the first time.
Timing matters here too. If it's mid-October and you haven't started, we'd rather wait for the first couple of rains to pass and the ground to firm up than grind through saturated clay. A pad compacted wet is a pad that fails the test. Winter rain also means you need erosion control on bare ground, which the SWPPP and grading rules cover.
Utilities and access
Power, water, and sewer or septic all come after the pad is roughed in, but the trenching is easier before any of the piers are set. Plan the routes at the same time as the pad. A trench that crosses a driveway, a leach line, or a buried pipe needs to be marked and called in ahead of time through 811.
Access is its own project. The delivery truck and the crane or set-up crew need a road with enough width, a firm surface, and room to turn. A driveway that's fine for a pickup may not hold a loaded transport rig in November. On rural parcels, that can mean base rock and a culvert before anything else shows up.
Common Questions
How much does manufactured home site preparation cost?
It depends on the lot, so a single number would mislead you. A flat, cleared parcel with utilities at the street is a very different job from a burned foothill lot that needs debris removal, septic, and a long driveway. The honest way to price it is a site visit, and you can request a free estimate through our quote form.
Do I need a permit before I grade the pad?
Often yes, or at least an approved grading plan. In the Town of Paradise, the permit checklist includes a grading and best management practice form, and some sites also need a soils compaction letter. Ask your building department before you move any dirt.
Can I put a used manufactured home on my lot?
It depends on the age of the unit and your local rules. Butte County's installation packet said that as of May 2024 it would not issue a permit for a home built before September 1, 2008. Confirm the current rule with the county before you buy.
Does a manufactured home need a permanent foundation?
On private land, the home is typically installed on a foundation system that meets HCD requirements, and the local building department inspects it. Whether that foundation is treated as permanent for property tax and financing purposes is worth a call to the county assessor and your lender.
The bottom line
Do the site work in this order: debris and trees, septic, permit, pad, utilities, foundation. Get the septic layout settled before anyone grades, and ask for the current checklist from your building department before you spend a dollar on dirt. If the pad is going in this fall, plan around the rain and don't compact wet soil.
Walberg, Inc. handles the clearing, grading, septic, and trenching side of this in Butte, Tehama, and Shasta counties. If you've got a lot that needs to be ready before a home gets delivered, request a free estimate and we'll walk the site with you. You can also see where we work around Paradise.