The Contractors State License Board (CSLB) is the California agency that licenses and regulates all contractors. Any construction work valued at $500 or more in combined labor and materials requires the contractor to hold a valid CSLB license. This is not a gray area — the $500 threshold is a hard rule.
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Most construction work beyond minor repairs requires a building permit from the local building department:
The permit process involves: 1. Submit plans (for larger projects — may require architect or engineer stamp) 2. Plan check review by building department 3. Issue permit 4. Construction proceeds 5. Inspections at key stages (framing, rough-in electrical/plumbing, insulation, drywall, final) 6. Final inspection — leads to Certificate of Occupancy (CO)
Unpermitted work is a material fact that must be disclosed by sellers in California. Unpermitted work discovered by a buyer can result in required remediation, and lenders may refuse to fund loans on properties with significant unpermitted improvements.
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A Certificate of Occupancy is issued by the local building department after a final inspection confirms the construction complies with all applicable codes. The CO:
For property management, a CO is a key document — renting a space without a CO (or with an expired CO) can expose the landlord to liability if a tenant is injured.
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Senate Bill 800 (2002) established California's new home warranty standards and the mandatory pre-litigation process for construction defect claims. It applies to newly constructed single-family homes and new condo units.
| Category | Warranty Period | |---|---| | Structural defects (foundation, load-bearing components) | 10 years | | Plumbing/sewer | 4 years | | Electrical/mechanical | 4 years | | Fit and finish (interior surface defects — paint, trim, tile) | 1 year | | Roof | 4 years (installed products warranty varies) | | Waterproofing | 4 years |
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Before a homeowner can sue a builder for construction defects under SB 800, they must complete the Calderon process — a mandatory pre-litigation dispute resolution procedure:
1. Homeowner sends written notice to the builder describing the claimed defect 2. Builder has 14 days to acknowledge the notice 3. Builder has 30 days to inspect the defect (or 40 days for multi-unit buildings) 4. Builder has 30 days after inspection to offer to repair or monetary settlement 5. Homeowner accepts or rejects the offer 6. If rejected or no offer made, the homeowner may proceed with litigation
The purpose: allow builders to fix defects before expensive litigation. Many claims are resolved through this process without court involvement.
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Mechanic's Liens protect contractors, subcontractors, suppliers, and laborers who provide labor or materials to improve real property. If they are not paid, they can file a lien against the property.
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Construction defect cases in California (for pre-SB-800 structures or cases outside SB 800's scope) involve:
Discovery rule: The statute of limitations for construction defects typically begins when the owner discovers (or reasonably should have discovered) the defect, not when the work was completed.
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Quiz Questions:
Q1. A homeowner hires an unlicensed handyman to renovate a bathroom for $4,500. During the work, the handyman falls off a ladder and is injured. What is the likely consequence for the homeowner?
A) No consequence — independent contractors are responsible for their own safety B) The homeowner may be liable for the handyman's injuries because unlicensed contractors do not carry proper workers' compensation insurance; the homeowner may be treated as the de facto employer C) The CSLB requires the handyman to have his own insurance regardless of license status D) The homeowner is protected because the contract was for a fixed price
Answer: B — Using an unlicensed contractor creates significant liability exposure. Without a CSLB license, the contractor likely lacks proper workers' compensation insurance, potentially making the property owner liable as the de facto employer for any on-site injuries.
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Q2. A new home buyer discovers a crack in the foundation 8 years after purchase. The builder says the SB 800 warranty has expired. The buyer says the structural warranty covers this. Who is correct?
A) The builder — SB 800 warranties expire at 5 years B) The buyer — SB 800 provides a 10-year warranty for structural defects including foundation issues C) Neither — foundation cracks are excluded from SB 800 D) The builder — only the 1-year fit and finish warranty applies
Answer: B — SB 800 provides a 10-year warranty for structural components, including the foundation. A foundation crack discovered 8 years after construction is within the warranty period.
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Q3. A subcontractor provides electrical work on a commercial construction project starting June 1 but does not serve a preliminary notice on the owner. On September 15, the subcontractor is not paid and wants to file a mechanic's lien. What is the most likely outcome?
A) The subcontractor can still file a valid lien — preliminary notices are optional B) The subcontractor cannot file a valid mechanic's lien because the 20-day preliminary notice was not timely served C) The subcontractor can file if the project was not yet complete on September 15 D) The preliminary notice requirement only applies to projects over $100,000
Answer: B — Subcontractors (not in direct contract with the owner) must serve a preliminary notice within 20 days of first furnishing labor or materials. Failure to timely serve the preliminary notice bars the subcontractor from filing a mechanic's lien. The 20-day clock started June 1.
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Q4. Under the SB 800 Calderon process, a homeowner discovers water intrusion in the walls. What must the homeowner do BEFORE filing a lawsuit against the builder?
A) The homeowner can file suit immediately — no pre-litigation requirement applies to water damage B) The homeowner must first send written notice to the builder; the builder then has an opportunity to inspect and offer to repair before litigation can commence C) The homeowner must hire a licensed engineer to confirm the defect in writing before filing suit D) The homeowner must contact the DRE to investigate the builder first
Answer: B — SB 800 requires the mandatory Calderon pre-litigation process. The homeowner must serve written notice on the builder, who then has specific timeframes to acknowledge, inspect, and offer to repair. Only after this process can the homeowner proceed with litigation.
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Q5. A seller in California has a 1,200 SF addition built in 2018 without permits. The addition is finished and used as a bedroom. What are the seller's disclosure obligations?
A) No disclosure is needed if the work was completed more than 4 years ago B) The unpermitted addition is a material fact that must be disclosed to the buyer; the buyer and their lender may require the work to be permitted and inspected C) The seller only needs to disclose if the building department has issued a citation D) The seller can disclose the square footage without mentioning the permit status
Answer: B — Unpermitted construction is a material fact in California. Sellers must disclose known unpermitted work on the Transfer Disclosure Statement (TDS). Buyers' lenders may refuse to fund loans on properties with significant unpermitted improvements, and buyers may require remediation as a condition of sale.