We get asked about manufactured homes more than you might think. Some are in parks. Some sit on their own lots out past the edge of town. The questions are usually the same: the floor feels off, a door won’t latch, the skirting is bowing, or a buyer’s inspector flagged the support system.
Here’s the straight version of what matters, who’s in charge of what, and what to do first.
Park space or private lot comes first
This decides who issues permits and who inspects. Get it wrong and you lose time.
- In a mobilehome park. Under the state Health and Safety Code (Section 18300), the Department of Housing and Community Development (HCD) enforces the Mobilehome Parks Act unless a city or county has taken over that job. HCD’s Local Enforcement Agencies page has a park search that tells you which agency handles a specific park. Check it. Don’t assume.
- On a private lot. When a manufactured home sits on its own parcel, the local building department is generally where foundation permits go. In Poway that’s the City’s Building Services division.
Poway’s zoning code also has a separate zone for parks, Chapter 17.16, the Mobile Home Park Zone. If you’re in one, the park’s own rules apply on top of state rules.
Do: find out who your enforcement agency is before you hire anyone. Don’t: start work and sort out the permit later.
What’s holding the house up
Most manufactured homes sit on a steel chassis. The chassis rests on piers, usually stacked blocks or steel stands, on top of pads. Tie-downs anchor the home against wind and movement. Some homes have an engineered foundation system instead, with a permanent footing and connections.
State regulations (Title 25, Section 1333) say a foundation system has to be designed for the home and the local soil. It must follow the manufacturer’s instructions, or plans signed by an architect or engineer if no instructions exist. In plain terms: you can’t just stack blocks however you like.
Common setups you’ll see:
- Piers and pads with tie-downs. Common in parks. Simple. Depends heavily on the pads and the soil under them.
- Earthquake-resistant bracing system (ERBS). A bracing system added under the home to limit how far it can drop in a quake.
- Engineered foundation system. Permanent footings designed for the site. More common on private land, and sometimes needed for financing.
Why Poway ground matters here
Poway’s General Plan Safety Element calls out expansive clays, including the Friars Formation, and settlement in poorly compacted fill. A pier pad sitting on clay rises and falls as the clay swells and shrinks. A pad sitting on loose fill can sink.
A site-built house spreads its weight along continuous footings. A manufactured home puts that weight on a row of small points. When one pad drops, that spot drops. That’s why these homes can go out of level faster than site-built houses on the same street.
Signs worth writing down:
- Floors that slope or bounce in one area
- Doors and windows that bind or swing on their own
- Gaps opening between sections of a multi-section home
- Skirting that’s bowing, buckled or pushed out
- Water standing under the home after rain
- Piers that lean, or shims that have slipped out
Bracing: what the rules say
If you’re thinking about adding an earthquake-resistant bracing system, note that state regulations (Title 25, Section 1374.5) require a permit to install one. The system must be installed per the certified manufacturer’s instructions. In a park, the owner also has to get the park operator’s approval before any excavation.
Do: use a system certified for your home and install it under a permit. Don’t: let anyone dig under a park home without the operator’s written okay.
Re-leveling isn’t a cure-all
Re-leveling means jacking the home back to level and re-shimming the piers. It’s common. It’s often the right first step. But if the pads are sitting on soft or wet ground, the home will drift again.
Before re-leveling, ask:
- Why did it go out of level? Water, soil, a failed pad, or a missing pier?
- Is water getting under the home? From gutters, a leak, a sprinkler or grading?
- Are tie-downs still tight after leveling? Leveling can loosen them.
- Does the support system match the manufacturer’s installation instructions?
If the answers point to the ground, fix the water and the pads first. Otherwise you’ll be paying for the same job again.
Do this before you call anyone
Simple steps. No tools beyond a flashlight and a phone camera.
- Walk the outside. Look at gutters and where downspouts dump. Water should go away from the home.
- Look under the skirting with a flashlight. Note any standing water, leaning piers or loose tie-downs.
- Roll a marble on the floors. Note where it goes.
- Check every door. Note which ones stick and where.
- Find your paperwork: the installation instructions, any past permits, and the home’s data plate information.
- Confirm your enforcement agency (park search or City).
Don’t: crawl under the home if it looks unstable or if there’s standing water near wiring. Take photos from the opening instead.
Who does what
Here’s how the work usually splits up:
- Enforcement agency (HCD, the City, or a local agency for the park) issues permits and inspects.
- Park management approves work in the park and handles common-area drainage.
- Installer or contractor levels, repairs supports, and installs bracing or foundation systems.
- Engineer designs a foundation system or evaluates a problem the instructions don’t cover. We coordinate with licensed engineers as needed.
What shapes the cost
We won’t throw out numbers without seeing the home. Here’s what moves the scope:
- Single or multi-section home
- How far out of level it is, and how many piers need work
- Soil and drainage problems that need fixing first
- Whether bracing or a new foundation system is part of the plan
- Access under the home and how much skirting comes off
- Permits, plans and inspections required by the enforcement agency
Straight answer
A manufactured home that’s out of level is usually fixable. The trick is fixing why it moved, not just how far. If you’re in Poway, in a park or on your own land, start with a Free Quote. We’ll look at the supports, the ground and the water, and tell you what we see. For more background, see our pages on foundation inspection and seismic retrofit, and, for clay ground, expansive soil foundation repair.