Most homeowners meet raised foundation repair as a symptom: a bouncy hallway, a floor that tilts toward the middle of the house, a door that won’t latch, or a crawl-space inspection report with words like “deteriorated post” or “girder deflection.” What happens after that point is less familiar. The work happens out of sight, and much of it involves people lying on their backs in a crawl space.
This post walks through the process phase by phase, from the homeowner’s side. It explains what happens at each step, which decisions come up, what can change once the crawl space is opened up, and what “done” should look like. Our raised foundation repair page covers what a raised foundation is, common causes, and the methods we use. If you haven’t started yet, our watch list for older La Jolla raised foundations is the place to begin.
Raised foundation repair is usually a sequence of decisions, not one fix. Each phase narrows the question for the next one.
Phase 1: Get access sorted out
Nothing useful happens until someone can get under the house and move around. The California Residential Code (R408.4) requires access to every under-floor space: an opening through the floor of at least 18 by 24 inches, or through a perimeter wall of at least 16 by 24 inches, with an areaway if the wall opening is below grade. R408.5 calls for the under-floor grade to be cleaned of vegetation and organic material.
Many older homes fall short. The hatch is in a closet under stored boxes, the wall vent was framed shut during a remodel, or debris and old ductwork block the path to the back of the house. Before an evaluation, it helps to:
- Find the access point and clear the area around it
- Note any history of standing water, pests, or animal activity
- Gather any earlier inspection reports, permits, or repair receipts
- Write down when the symptoms upstairs started and whether they change with the seasons
If access is too tight to evaluate safely, improving it can be the first piece of work. Without a safe way in, nobody can evaluate or maintain the space.
Phase 2: Map what’s under the floor
A good crawl-space evaluation is a mapping exercise. The evaluator works out the layout first: where the perimeter stem wall runs, where the interior girders and posts sit, which way the joists span, and where plumbing and ducts cross. Then they look at the condition of each part:
- Posts and pads. Leaning, crushed, split, or sitting on soil or a broken pad
- Girders and joists. Sagging, notched by past trades, soft at bearing points, or showing old shims
- Sill plate. Decay or insect damage where the wood sits on the concrete, plus whether anchor bolts are visible
- Stem wall and footings. Cracks, displacement, or spalled concrete
- Moisture. Wet soil, condensation, efflorescence, or water stains running down from plumbing
Upstairs, floor elevations are measured to see the shape of the problem. A floor that dips in the middle points to interior supports. One that slopes toward an outside wall points to the perimeter. Our post on measuring uneven floors explains how those readings work.
Phase 3: Sort the causes before choosing fixes
This phase has a lot to do with whether the repair lasts. A rotted post is a finding. The question is why it rotted. Raised-foundation problems usually fall into a few groups, and many houses have more than one:
- Moisture. Poor drainage, irrigation against the foundation, plumbing leaks, or blocked vents keep wood wet. Our posts on wet crawl space warning signs and coastal moisture and drainage patterns cover this in depth.
- Support movement. Pier pads or perimeter footings settling or shifting, sometimes tied to fill or expansive soil. See foundation settlement repair.
- Framing issues. Undersized or over-spanned members, or members cut by past remodels.
- Seismic connections. Missing anchor bolts or unbraced cripple walls. This is a separate scope from repair, but it’s often noticed during the same visit; see our bolt-and-brace overview.
If moisture is the driver, new posts on wet soil will start the same clock over again. That is why drainage fixes are often done before or alongside the structural work, not afterward.
Phase 4: Decide on in-kind repair or engineered design
Once the causes are clear, the scope falls into one of two broad types.
Repair in kind means replacing damaged pieces with the same size and type: a post for a post, a pad for a pad, a sistered joist next to a cracked one, where the existing system is basically sound.
Engineered design applies when the existing system isn’t adequate or is being changed. Examples include adding a girder line, changing post spacing, building new footings, dealing with a stem wall that has moved, or addressing settlement that needs deeper support. That is when a California-licensed engineer prepares the design and, if soil is part of the question, a geotechnical engineer may be involved. City Information Bulletin 141 requires a geotechnical report when foundations bear on fill or expansive soil.
La Jolla Structural evaluates on site, and we coordinate with licensed engineers as needed. Our post on when to involve a structural engineer covers what typically triggers that step.
Phase 5: The permit fork
Structural repair in the City of San Diego generally needs a Building Permit under SDMC §129.0202. For raised foundations, the main question is which permit path applies. Our companion guide on San Diego permit basics covers the whole process. Here are the points specific to raised floors.
The No-Plan path. Information Bulletin 203 allows “damage repair and replacement-in-kind (same size and specifications)” without plan review when the existing structural framing system is sufficiently intact for the City inspector to verify it. Two details matter:
- A pre-construction inspection is required for all repair and replacement-in-kind permits.
- Repairs to pre-engineered or manufactured members such as glulam beams, Parallams, Microlams, and engineered joists are not eligible for a No-Plan permit.
If the inspector decides the work is too extensive, or can’t verify the existing construction, plans are required and a new permit is issued.
The plan-review path. Engineered scopes go through plan review, with plans prepared by a licensed professional when state law or the Building Official requires it (SDMC §129.0206–.0207). For reference, City Information Bulletin 140 lists what raised-floor plans show: continuous foundations and pier footings, footing size and depth, stem dimensions, joist size and spacing, and crawl-space access and vents.
Older homes may also need historic review, and coastal or hillside parcels can add their own layers. Those are worth checking early, since they affect the order of everything that follows.
Phase 6: Temporary support, then repair
Inside the crawl space, the work usually follows a predictable order:
- Temporary support. Shoring posts or jacks go in to carry the floor while damaged parts come out. Nothing load-bearing should be removed without them.
- Remove and replace. Damaged posts, pads, girder sections, or sill plates are taken out and replaced as the scope or plans specify.
- Use decay-resistant material where the code requires it. CRC R317.1 requires naturally durable or preservative-treated wood in a crawl space where joists are closer than 18 inches to exposed ground, girders closer than 12 inches, or wood columns closer than 8 inches. Wood in direct contact with the ground has to be rated for ground contact.
- Adjust gradually. Where floors are being brought back toward level, adjustments are made in small steps. Raising a floor that has been sagging for decades can crack plaster, rack door frames, and stress plumbing, so the goal is usually “better and stable,” not perfectly flat.
- Address moisture. Drainage corrections, plumbing leak repairs, vent clearing, or ground cover are finished so the new work stays dry. Our crawl space foundation repair page covers that side of the job.
Many homeowners stay in the house during crawl-space work. Plan for noise, an access path through the yard or garage, and some days when utilities under the floor are being worked around.
Phase 7: When the crawl space surprises you
Raised-foundation work often turns up conditions that only show once things are opened. A girder that looked fine turns out to be soft inside. A post base is hiding a cracked footing. A sill plate that seemed sound crumbles once a bolt goes in.
How those finds are handled matters. Under City Information Bulletin 120, construction changes to approved plans have to be reviewed and approved by the City before the changed work is built, and a construction change does not extend the permit. On a No-Plan permit, a find that pushes the work past in-kind repair can mean plans are now required. In practice, that means:
- The find is documented with photos and measurements
- The engineer, if one is involved, decides on the revised detail
- The City approves the change through the appropriate path
- The scope and schedule are updated in writing before work continues
If a significant surprise turns up and work simply carries on without those steps, ask why.
Phase 8: Inspections and closeout
City inspections happen at the stages listed on the permit or set by the inspector. If special inspection is called out on the plans, those reports must be kept on site and final summaries submitted. At closeout, you should get:
- A finaled permit, which you can confirm through the City’s records
- Photos of what was found and what was installed, especially areas that are now hidden
- Any engineer’s letters or observation reports
- A note on ongoing maintenance: keep vents clear, keep irrigation away from the foundation, and check the crawl space after a wet winter
Those records matter when you sell, refinance, or need someone to look at the house again years later.
Cost factors, not prices
We do not publish prices. What a raised-foundation repair involves depends on access and clearance, how many supports and how much framing are damaged, whether the work is in-kind or engineered, whether footings or the stem wall need work, whether geotechnical input is required, how much moisture correction is needed, what gets found once things are opened, and permit, historic, or coastal requirements. Our posts on what drives foundation repair cost and questions to ask a foundation company help you compare proposals.
A note on seismic scope
If your house has a garage level with living space above, or tall cripple walls under the floor, the seismic side can overlap with repair. CRMP notes that post-and-pier and hillside houses generally need an engineered retrofit rather than a standard plan set. Today’s companion post on soft-story seismic concepts explains that vocabulary, and our seismic retrofit page covers our approach.
Next step
Clear a path to the crawl-space access, gather any old reports, and note what you’ve noticed upstairs. Then request a Free Quote for an on-site evaluation anywhere in La Jolla, or call (650) 739-6537. A foundation inspection is often how Phase 2 starts.
Sources (accessed October 8, 2026)
- 2025 California Residential Code §R408.4 Access and §R408.5 Removal of debris (under-floor space)
- California Residential Code §R317.1 Protection of wood and wood-based products against decay
- City of San Diego Information Bulletin 203, No-Plan Building Permit (July 2024)
- City of San Diego Information Bulletin 120, Project Inspections (October 2025)
- City of San Diego Information Bulletin 140, Residential Addition/Remodel (April 2026)
- City of San Diego Information Bulletin 141, Soil Bearing Capacity (April 2026)
- San Diego Municipal Code §129.0202 and §129.0206–§129.0207
- California Residential Mitigation Program, The Earthquake Soft-Story Retrofit (post-and-pier and hillside houses)