Construction Defects and Insurance Claims in California: The Right to Repair Act and Beyond

Your home has cracks in the stucco. Water is leaking through the windows. The foundation is settling unevenly. A plumber discovers that the drain lines were never properly sloped. You file an insurance claim. The carrier denies it, citing the exclusion for “faulty, inadequate, or defective design, specifications, workmanship, repair, construction, renovation, remodeling, grading, or compaction.”

The carrier is half right. The defect itself — the bad stucco job, the improperly flashed windows, the poorly graded foundation — is excluded. But the resulting damagefrom that defect may not be. Under California law, the water damage to your interior, the mold growth behind your walls, and the structural deterioration caused by ongoing water intrusion may all be covered under your homeowner’s policy through the ensuing loss savings clause and the efficient proximate cause doctrine.

This article explains what constitutes a construction defect, how California’s Right to Repair Act works, and how construction defects intersect with property insurance coverage.

What Constitutes a Construction Defect

A construction defect is any condition in a building that results from defective design, defective materials, or defective workmanship that reduces the value or useful life of the property or causes damage. California Civil Code §896 establishes specific performance standards for residential construction, covering:

• Water intrusion: Windows, doors, roofing, exterior wall assemblies, balconies, and decks must be designed and built to prevent unintended water intrusion
• Structural integrity: Foundations, load-bearing walls, and framing must meet building code specifications for structural performance
• Soil and grading: The site must be properly graded, compacted, and drained to prevent damage to the structure
• Plumbing and sewer: Systems must be installed to code and function as intended without leaks or backups
• Electrical: Wiring, panels, and fixtures must comply with applicable building codes
• Fire protection: Fire-rated assemblies, sprinkler systems, and smoke barriers must meet code requirements
• Other building components: Stucco, paint, HVAC systems, exterior pathways, driveways, and hardscape must meet applicable functionality standards

California’s Right to Repair Act (SB 800)

California Civil Code §895 et seq., commonly known as the Right to Repair Act or SB 800, was enacted in 2002 and applies to residential construction where the original purchase agreement was signed on or after January 1, 2003. The Act establishes a mandatory prelitigation process that homeowners must follow before filing a construction defect lawsuit against the builder.

The Prelitigation Process

Before a homeowner can file a lawsuit for construction defects, they must comply with the following steps under Civil Code §910–938:

1. Written notice to the builder. The homeowner must provide the builder with written notice of the claimed defects, describing them in reasonable detail (Civil Code §910).
2. Builder’s acknowledgment. Within 14 days, the builder must acknowledge receipt of the notice (Civil Code §913).
3. Builder’s election. Within 30 days of acknowledgment, the builder may elect to inspect the property. If the builder elects to inspect, the inspection must be completed within a specified timeframe (Civil Code §916).
4. Builder’s offer to repair. If the builder chooses to make an offer, it must include a detailed description of the repairs the builder is willing to perform, a timetable for completion, and any monetary compensation offered (Civil Code §917).
5. Homeowner’s response. The homeowner may accept, reject, or negotiate the offer. If the homeowner rejects, the homeowner may proceed with filing a lawsuit (Civil Code §921).

Builder’s Obligations Under SB 800

The Act imposes specific obligations on builders, including:

• Meeting the construction standards set forth in Civil Code §896
• Providing a written limited warranty to the original purchaser
• Participating in the prelitigation process in good faith
• If the builder elects to repair, completing the repairs within the timeframe specified in the offer

How Construction Defects Intersect with Property Insurance

Here is where most homeowners and many adjusters get confused. There are two entirely separate insurance analyses at play in a construction defect situation:

1. The homeowner’s property insurance policy — covering the homeowner’s own property damage
2. The builder’s commercial general liability (CGL) policy — covering the builder’s liability for defective work

These are different policies, held by different parties, covering different interests. Understanding both is critical.

The Homeowner’s Policy: The Defect Is Excluded, but the Resulting Damage May Not Be

Every standard homeowner’s policy (HO-3) excludes loss caused by faulty workmanship, defective construction, and similar defects. The carrier will not pay to fix the defect itself — you cannot file an insurance claim to correct a poorly installed roof or a foundation that was built wrong.

But most HO-3 policies contain an ensuing loss savings clause immediately following the faulty workmanship exclusion. It typically reads:

“However, any ensuing loss to property described in Coverages A and B not precluded by any other provision in this policy is covered.”

This means the water damage, mold growth, structural deterioration, and other damage that results from the construction defect can be covered — even though the defect itself is excluded. The defective window flashing is excluded. The water damage to the drywall, framing, and flooring behind that window is an ensuing loss from a covered peril (water). For a complete analysis of this doctrine, see our article on ensuing loss.

The Efficient Proximate Cause Angle

In California, the analysis goes further. Under the efficient proximate cause (EPC) doctrine, the question is: what was the predominating cause of the damage? If a construction defect created a conditionthat allowed a covered peril to cause damage, the covered peril — not the defect — may be the proximate cause of the loss.

Example: A contractor improperly waterproofs a shower pan. Over time, water migrates through the defect and damages the subfloor, framing, and the ceiling of the room below. The defective waterproofing created a condition. The water caused the damage. Under California Insurance Code §530 and the EPC doctrine, the water is the proximate cause of the claimed damage. The faulty workmanship is a remote cause. For the full EPC framework, see our article on the efficient proximate cause doctrine.

The Builder’s CGL Policy

A builder’s commercial general liability (CGL) policy is a third-party liability policy. It does not cover the builder’s own defective work — that is a business risk, not an insurable event. But the CGL policy may cover damage to other propertycaused by the builder’s defective work.

For example, if a subcontractor’s defective plumbing installation causes water damage to the homeowner’s flooring, walls, and personal property, the general contractor’s CGL policy may cover the resulting property damage (though not the cost of correcting the defective plumbing itself). The standard CGL form includes a “your work” exclusion, but it has a subcontractor exception — damage arising from work performed by a subcontractor is often covered.

HOA and Condominium Construction Defect Claims

Construction defect claims are exceptionally common in California condominium and HOA settings. Multi-unit construction involves more subcontractors, more interfaces between building components, and more opportunities for defects. Common defect issues in condominiums include:

• Water intrusion through exterior walls, windows, balconies, and roofing affecting common areas and individual units
• Inadequate waterproofing of parking structures and below-grade areas
• Defective stucco or siding systems allowing moisture migration
• Foundation and structural issues from improper soil compaction or grading
• Plumbing defects in shared systems affecting multiple units

In HOA claims, the association typically pursues the construction defect claim against the builder on behalf of all owners for damage to common areas. Individual unit owners may need to pursue separate claims for damage within their own units. The insurance analysis becomes more complex because three policies may be in play: the HOA’s master policy, the individual owner’s HO-6 policy, and the builder’s CGL policy.

For more on how HOA and condo insurance claims work, including the master policy vs. individual policy analysis, see our article on condo and HOA claims.

Code Upgrade Issues in Construction Defect Repairs

When a construction defect causes damage that requires repair, the repair often triggers code upgrade requirements. Building codes change over time, and a repair that opens up walls, replaces structural components, or involves significant reconstruction may require the entire affected area to be brought up to current code.

Standard homeowner’s policies exclude the cost of enforcing building codes (the “ordinance or law” exclusion). However, most policies offer ordinance or law coverage through an endorsement or built-in sublimit. If your construction defect repair triggers code upgrades, you will need this coverage. See our article on code upgrade coverage for a detailed explanation.

Statutes of Limitation: How Long You Have to Act

California has specific statutes of limitation for construction defect claims that are different from the general limitation periods:

• Patent defects — CCP §337.1: Four years from substantial completion of the improvement. A patent defect is one that is apparent or discoverable through reasonable inspection. If you can see the cracked stucco, the uneven foundation, or the improperly installed windows, the clock is running.
• Latent defects — CCP §337.15:Ten years from substantial completion of the improvement. A latent defect is one that is hidden — not discoverable through reasonable inspection. Defective plumbing inside walls, inadequate waterproofing beneath the slab, and improper structural connections hidden by finishes are latent defects. The ten-year period is an outside limit; the actual statute of limitations begins to run when the defect is discovered or should have been discovered.
• SB 800 standards — Civil Code §896: The Right to Repair Act establishes its own limitation periods for each category of defect. For example, water intrusion claims must be brought within five years of close of escrow, while structural claims may have a ten-year window. These may differ from the CCP periods, and the more specific SB 800 deadlines typically control for residential construction subject to the Act.

What to Do If You Suspect a Construction Defect

1. Document the damage immediately. Photograph and video all visible damage, water staining, cracking, and any areas where the damage appears to be progressing.
2. Determine whether SB 800 applies. If your home was built and the purchase agreement was signed on or after January 1, 2003, the prelitigation process likely applies.
3. File an insurance claim for the resulting damage. Even though the defect itself is excluded, the resulting damage — water intrusion, mold, structural deterioration — may be covered as an ensuing loss. File the claim. Do not let the carrier tell you the entire loss is excluded without addressing the ensuing loss provision.
4. Consult a construction defect attorney. For the claim against the builder, you need an attorney. Construction defect litigation is specialized and involves engineering experts, forensic analysis, and the SB 800 prelitigation process.
5. Do not make permanent repairs before documentation is complete. Both the insurance carrier and the builder (through the SB 800 process) have a right to inspect the damage. Premature repairs can destroy evidence and undermine your claim.
6. Watch the deadlines. The CCP limitation periods and the SB 800 timelines are strict. Missing a deadline can eliminate your right to recover entirely.