Construction defect liability in California can extend to developers, general contractors, subcontractors, architects, engineers, material suppliers, real estate sellers, and inspectors. Liability theories include strict liability (limited after McMillin Albany), negligence, breach of contract, breach of warranty, and violation of SB 800 performance standards under Civil Code § 896. California’s joint and several liability rules (modified by Proposition 51) and the Right to Repair Act’s pre-litigation requirements shape how claims are pursued. This guide identifies each potentially liable party, explains the legal theories involved, and offers practical guidance on building a multi-party claim.

A single construction defect can involve a chain of responsible parties — from the developer who planned the project to the subcontractor who installed the flashing to the manufacturer who supplied the waterproofing membrane. Identifying the right parties to pursue is one of the most consequential decisions in a California construction defect case, because it determines the available sources of recovery, the applicable insurance policies, and the legal theories that can be asserted.

This guide maps out every potentially liable party in a California construction defect case, the legal theories that apply to each, and the practical considerations that affect which parties are worth pursuing.

Which Parties Can Be Held Liable for Construction Defects in California?

Developers and Builders

Developers and builders bear primary liability for construction defects in California. Under the Right to Repair Act (Civil Code § 896), a “builder” includes any entity that develops and sells residential units. Developers are responsible for the overall project — they select the general contractor, approve plans, and make decisions about materials and methods. Even if a developer subcontracts all actual construction, it remains liable for defects in the finished product.

Developers face liability under breach of contract (the purchase agreement), breach of express and implied warranties (including the implied warranty of habitability for new residential construction), and violation of SB 800 statutory standards.

General Contractors

The general contractor manages day-to-day construction operations, hires and supervises subcontractors, and is responsible for ensuring work complies with plans, specifications, and building codes. General contractors may be liable for their own negligent supervision and for defective work performed by subcontractors under their direction.

Indemnity clauses in construction contracts frequently shift financial risk between developers and general contractors. These clauses can require the general contractor to defend and indemnify the developer for defect claims — a provision that significantly affects which party ultimately bears the cost.

Subcontractors

Each trade subcontractor — framing, plumbing, electrical, HVAC, roofing, waterproofing, concrete, stucco, and others — may be liable for defects within the scope of its work. In practice, construction defect litigation often involves numerous subcontractors, each potentially responsible for a different aspect of the building’s failure.

Under Civil Code § 936, subcontractors are included within the SB 800 framework. They may face claims for negligence, breach of contract (with the general contractor), and violation of applicable building standards. Subcontractors frequently carry their own commercial general liability (CGL) insurance policies, creating additional sources of recovery.

Architects and Design Professionals

Architects, structural engineers, civil engineers, geotechnical engineers, and other design professionals may be liable when defects result from flawed plans, specifications, or design decisions. A design professional’s liability is typically evaluated against the professional standard of care — what a reasonably competent professional in the same discipline would have done under similar circumstances.

Design defects can include inadequate waterproofing details, undersized structural members, improper drainage design, failure to account for site-specific conditions (such as expansive soils or seismic risk), and non-compliance with California Building Code requirements.

Material Manufacturers and Suppliers

When a defect results from a defective product — such as a waterproofing membrane that fails prematurely, windows that leak despite proper installation, or concrete that deteriorates abnormally — the manufacturer or supplier may be liable. Product liability claims can be based on strict liability (the product was defective), negligence (the manufacturer failed to exercise reasonable care), or breach of warranty.

Identifying material defects often requires testing by an expert who can distinguish between product failure and installation error — a distinction that significantly affects which party bears responsibility.

Real Estate Sellers and Disclosure Obligations

Under California Civil Code §§ 1102–1102.17, sellers of residential property must disclose known material defects. A seller who conceals or fails to disclose a known construction defect may face liability for fraud, negligent misrepresentation, or violation of statutory disclosure requirements. This applies to both original developers selling new units and subsequent sellers in resale transactions.

Inspectors

Building inspectors — both public (municipal code enforcement) and private (third-party inspection firms) — may face liability if they negligently approved work that did not meet code requirements. Government inspectors typically enjoy immunities that limit claims, but private inspection firms hired by the developer or builder can be pursued for professional negligence.

What Legal Theories Apply to Construction Defect Claims in California?

How Did McMillin Albany Change Liability Theories?

The 2018 California Supreme Court decision in McMillin Albany LLC v. Superior Court fundamentally reshaped construction defect litigation. The Court held that the Right to Repair Act (Civil Code §§ 895–945.5) is the exclusive remedy for construction defect claims involving residential properties sold after January 1, 2003 — supplanting traditional common law causes of action for negligence and strict product liability.

This means that for covered residential properties, homeowners cannot bypass the SB 800 statutory framework by pleading common law negligence or strict liability. The Right to Repair Act’s pre-litigation procedures (notice, inspection, repair offer) are mandatory, and the performance standards in § 896 define what constitutes an actionable defect.

However, McMillin preserved certain causes of action that are expressly carved out of the Act: breach of contract, fraud, and personal injury claims (Civil Code § 943(a)). For commercial properties or properties not covered by SB 800, traditional common law theories remain available.

What Are the Key Liability Theories?

How Do Joint and Several Liability and Indemnity Work in Construction Cases?

California follows a joint and several liability framework for economic damages, meaning any defendant found liable can be required to pay the full amount of economic damages — regardless of its percentage of fault — if other defendants cannot pay. Proposition 51 (Civil Code of Procedure § 1431.2), enacted in 1986, limits this rule for non-economic damages: each defendant is severally liable for non-economic damages only in proportion to its percentage of fault.

In practice, this means the party with the deepest pockets (often the developer or general contractor) may end up paying a disproportionate share of a construction defect judgment. This dynamic drives two important features of construction defect litigation:

Cross-complaints and indemnity: Defendants routinely file cross-complaints against one another, seeking indemnity (full reimbursement) or contribution (proportional sharing) based on contractual indemnity clauses or equitable principles. A general contractor sued by the developer may cross-complain against the subcontractor whose work caused the defect.

Insurance coverage: Each party’s commercial general liability (CGL) insurance policy provides both defense and indemnity coverage, subject to policy terms, exclusions, and limits. Identifying all available insurance policies — developer, GC, subcontractors, design professionals — is essential to maximizing recovery.

How Does Insurance Coverage Work for Each Party?

Insurance is the practical engine of construction defect recovery. Most defendants in a construction defect case do not pay out of pocket — their CGL policies respond to covered claims. Understanding the insurance landscape helps identify which parties offer meaningful recovery:

Developers/Builders: Typically carry CGL policies and may also carry owner-controlled insurance programs (OCIPs or “wrap” policies) that cover the entire project.

General Contractors: Carry CGL policies with completed operations coverage. The policy in effect when construction was completed is usually the one that responds to defect claims.

Subcontractors: Each subcontractor should carry its own CGL policy. Verifying subcontractor insurance at the time of construction is critical — uninsured or underinsured subcontractors represent gaps in recovery.

Design Professionals: Architects and engineers carry professional liability (errors and omissions) policies, which are separate from CGL policies and have different terms, exclusions, and deductibles.

Material Manufacturers: Product liability coverage under the manufacturer’s CGL or product liability policy.

How Do You Identify the Right Parties to Pursue?

Identifying the right defendants requires investigation. Start with the construction documents — plans, specifications, permits, and contractor lists typically identify every entity involved in the project. Expert inspections help trace each defect to a specific trade or design decision. The process for documenting construction defects directly supports this analysis.

Practical steps:

1. Obtain the original construction plans, specifications, and permits from the local building department.
2. Review the general contractor’s subcontractor list and all contracts, including indemnity provisions.
3. Retain experts to inspect the property and identify the trade or design discipline responsible for each defect.
4. Research insurance coverage — request certificates of insurance from the developer, GC, and all subcontractors.
5. Check contractor license status through the California Contractors State License Board (CSLB) to verify active licenses, bond information, and any disciplinary history.

Consider also whether the defects relate to California-specific climate and geographic conditions — site-specific failures (such as expansive soils or inadequate seismic design) may point to the geotechnical engineer or civil engineer rather than the general contractor.

Keep in mind the applicable statutes of limitations — the time to file claims against certain parties may be shorter than others, particularly for minor components under Civil Code § 896.

Protect Your Property — Talk to Bay Legal’s Construction Law Team

Whether you are a homeowner, HOA board member, or property investor, construction defect claims involve technical evidence, strict deadlines, and multiple parties. Bay Legal, PC works to help California property owners navigate these complexities with a calm, strategic approach.

Schedule a consultation with Bay Legal’s construction law team by calling (650) 668-8000 or visiting baylegal.com/practice-areas/construction-law/.

Frequently Asked Questions

Q: Can a homeowner sue both the developer and the subcontractor for the same defect?

A: Yes. California allows claims against multiple parties for the same defect. A homeowner may sue the developer under breach of contract and SB 800, while the developer cross-complains against the subcontractor whose work caused the defect. Joint and several liability means each liable party may be responsible for the full amount of economic damages.

Q: What did the McMillin Albany decision change about construction defect lawsuits?

A: The California Supreme Court held in McMillin Albany LLC v. Superior Court (2018) that the Right to Repair Act is the exclusive remedy for construction defect claims on residential properties sold after January 1, 2003. Homeowners can no longer pursue common law negligence or strict liability claims for these properties — they must follow SB 800 pre-litigation procedures and rely on the statutory performance standards in Civil Code § 896. Breach of contract, fraud, and personal injury claims remain available.

Q: Is a real estate seller liable for construction defects they did not cause?

A: A seller is not liable for defects they did not cause, but they may be liable for failing to disclose known defects. California Civil Code §§ 1102–1102.17 require residential sellers to disclose material defects they are aware of. Concealing or misrepresenting a known defect can give rise to fraud or negligent misrepresentation claims.

Q: How does Proposition 51 affect construction defect damages in California?

A: Proposition 51 (1986) provides that each defendant is jointly and severally liable for economic damages (such as repair costs) but only severally liable for non-economic damages in proportion to its percentage of fault. In construction defect cases, which primarily involve economic damages (cost of repair), joint and several liability means a deep-pocket defendant can be required to pay the full economic damages award even if it was only partially at fault.