Field notes / Homeowner guide
Foundation repair cost factors and how to compare proposals
Foundation proposals for the same house can differ widely because they assume different scopes. Before comparing totals, compare what each one includes, excludes and leaves to be discovered.
Written · KB Remodeling
The short answer
Compare proposals line by line against the same evaluation or engineered design. Ask each bidder to state, for every cost factor, whether it is included, excluded, an allowance or unknown until opened. This guide gives no price ranges: they depend on the house, the design and the authority.
Who this applies to
Owners comparing foundation repair, replacement or construction proposals. A seismic retrofit is priced on different factors and is not a guide to foundation repair cost.
01 · When it applies
Why totals mislead
One bidder may price a local repair and leave drainage out; another may include drainage, engineering and restoration of the finished floor. Their totals are not comparable until the scopes match.
Ask every bidder to work from the same evaluation or engineer's drawings, and to say where they disagree with it.
Ask yourself
- Are all proposals based on the same findings or drawings?
02 · Comparing the options
Cost factors and what drives each
Each factor below can move a proposal more than the repair method itself. The right-hand column is what to ask, not what it costs.
| Factor | What drives it | Question for each bidder |
|---|---|---|
| Access | Crawl-space height, hatch location, tight side yards | How will crews and equipment reach the work? |
| Extent of repair | How many sections, how much is hidden | What is the scope boundary, on drawings? |
| Excavation and spoil | Depth, hand vs machine digging, haul-off | Where does excavated soil go, and who removes it? |
| Temporary support | Loads, span, duration of exposure | How is the house supported, and is shoring designed? |
| Engineering | Design, calculations, site observation | Is the engineer's fee included or separate? |
| Geotechnical work | Whether a soils report is required | Is a soils investigation needed, and who arranges it? |
| Permits and inspections | Authority, plan check, required stages | Who applies, and are permit fees included? |
| Drainage | Grading, downspouts, subsurface water | Is any drainage correction included? |
| Utilities | Gas, water, sewer, electrical crossing the work | Which utilities are protected, moved or reconnected? |
| Restoration | Floors, walls, stucco, landscaping, hardscape | Exactly which finishes are restored, and to what level? |
| Exclusions and unknowns | Hidden conditions, pests, rot, hazardous materials | What is excluded, and how are discoveries priced? |
03 · The decision
Allowances, exclusions and change orders
An allowance is a placeholder amount for something not yet defined; the final cost follows what is actually done. An exclusion is work the bidder will not do under the contract. A change order records work added after signing. California's home improvement contract rules describe what a written contract must contain; read them before signing.
A low total with many exclusions can end up costlier than a higher, complete one.
Ask yourself
- How will hidden conditions be documented and priced if found?
Source for this section
04 · What to ask for
Before you sign
Check each contractor's license status with the CSLB. Confirm who holds the permit, who the engineer is and whether observation visits are included. Make sure the payment schedule follows completed, inspected milestones rather than dates.
Ask yourself
- Is the payment schedule tied to inspected work?
Source for this section
05 · Next step
Use an unpriced scope comparison
Lay proposals side by side with one row per factor above, and write included, excluded, allowance or unknown in each cell. Only when the rows match is comparing totals meaningful.
A scenario to consider
Proposal A includes engineering, permit fees and restoring the hardwood floor; Proposal B lists engineering as "by owner" and excludes the floor. Once both are written against the same rows, the owner can see which differences are scope and which are price.
Planning scenario
Bring this to your conversation
- Give every bidder the same findings or drawings
- Ask for each cost factor as included, excluded, allowance or unknown
- Confirm engineering and soils work
- Confirm permit responsibility and fees
- List utilities and restoration explicitly
- Check license status before signing
One more question
Can I use a seismic retrofit price to budget a foundation repair?
No. A retrofit is priced on anchorage and bracing; foundation repair depends on the damage, access, excavation, support and restoration. Neither predicts the other.
Official references
Agree on remodel scope · Web resource · English source
California Contractors State License Board — Home improvement contractsUse this for: Discuss written scope, changes and payments for home improvement work—not ground-up home contracts.
Check professionals · Web resource · English source
California Contractors State License Board — Check a contractor licenseUse this for: Check the current contractor record before hiring; a number alone does not establish scope or status.
Prepare plans and ADUs · Web resource · English source
LADBS — Plan review and permittingUse this for: For City of Los Angeles parcels, find LADBS plan review, online permits and appointments.
For requirements specific to your property, consult the local reviewing authority.
About this guide
Published by KB Remodeling from the official sources cited. It is not attributed to an individual author and does not claim review by an architect, engineer or attorney. We receive remodel, ADU, new-home and rebuild inquiries; scope, licensing and location are reviewed before any next step.