What Should Be Covered During Construction, Delivery, Set, and After Move-In?
The Insurance Gap Nobody Sees in the Rendering
A prefab home may be insured in the factory, uninsured during a particular handoff, insured again during transportation, and subject to entirely different coverage once it becomes an occupied residence. A single sales promise that the house is 'insured' does not answer who bears a loss at each stage.
The critical question is not whether someone has insurance. It is whose property, whose risk, which event, and which dates the policy actually covers.
Start With a Risk Timeline
Before paying a deposit, write down the project's phases: factory production, factory storage, loading, transportation, unloading, crane/set, foundation and site connections, field finishing, final inspection, and occupancy.
For each phase, identify the party bearing the risk of loss, the relevant insurance policy, limits, deductibles, exclusions, and claims contact. The handoffs are where misunderstandings develop.
Factory Coverage Is Not Automatically Your Coverage
The factory may insure its building, inventory, operations, or work in progress. None of those facts alone establishes that your purchased unit is protected for your benefit after title or risk transfers.
Ask when title transfers, when risk of loss transfers, whether the unit remains insured while stored, and who is paid if the unit is damaged before shipment.
Deposits and Insolvency Are Different Risks
Property insurance generally is not a guarantee that a manufacturer will deliver the home or return your deposit if its business fails.
Review payment milestones, deposit protection, refund rights, performance security if offered, and what happens to partially completed units if the seller cannot perform.
Transit Coverage
Transportation introduces collision, overturning, loading damage, weather, theft, and cargo-handling risks.
Confirm who arranges cargo or inland marine coverage, the covered value, route restrictions, deductibles, and whether coverage includes loading, unloading, temporary storage, and delays. A carrier's liability limit is not necessarily the replacement value of the home.
The Crane and Set Day
A crane operation can damage the module, foundation, neighboring property, or equipment. Separate questions arise about cargo coverage, riggers liability, crane contractor insurance, general liability, and the builder's risk policy.
Request written confirmation of the insurance arrangements for the set itself, including who bears damage to the module while suspended and when coverage changes after placement.
Builder's Risk: The Construction-Phase Policy
Builder's risk commonly addresses direct physical loss to covered construction property from specified causes during a defined construction period, subject to policy wording.
Ask whether the policy includes factory-built modules before arrival, offsite storage, transit, installation, materials on site, temporary works, and existing structures when an addition or ADU is involved. Do not assume every builder's risk policy includes those exposures.
General Liability Is Not Builder's Risk
A contractor's commercial general liability policy may respond to certain third-party bodily injury or property damage claims, subject to exclusions.
It is not automatically a first-party policy replacing damaged work or paying to correct faulty workmanship. Ask for evidence of coverage, but understand that a certificate of insurance does not amend the policy or guarantee a claim will be paid.
Workers' Compensation and Jobsite Injuries
Confirm who employs the set crew and trades, and verify required workers' compensation coverage where applicable. Owner-builder arrangements can create additional responsibilities.
Do not assume that a subcontractor's presence means the owner has no exposure. Verify the actual contracting and employment structure.
Existing Home and ADU Projects
An ADU project can expose the existing home to fire, excavation, utility, water, and access risks.
Tell the existing homeowners insurer about the planned work and ask how the existing dwelling, new construction, temporary vacancy, contractor operations, and liability are treated. The existing homeowners policy may not provide the construction coverage you expect.
Flood, Earthquake, Wildfire, and Wind
Standard property policies may exclude or limit particular catastrophes. California properties can have especially important wildfire and earthquake exposures, while flood coverage is usually separate.
Review the actual perils and exclusions for the site and project. A builder's risk policy and a permanent homeowners policy may cover these differently.
Rural Access and Site Conditions
Remote roads, steep driveways, limited fire access, cranes, seasonal road closures, and high wildfire exposure can affect insurability and premiums.
Resolve access feasibility and insurance eligibility before committing to a unit that must travel a difficult route.
Who Is Named on the Policy?
Identify the named insured, additional insureds where applicable, loss payees, lender interests, and any parties required to be insured under the contracts.
An additional-insured endorsement is not the same as being named as an insured under builder's risk. The correct arrangement depends on the policy and the party's interest.
Coverage Limits Must Reflect the Real Project
The retail price of a module may omit foundation, transport, crane, site work, installation, permits, utility connections, and professional costs.
Determine whether the insured value is sufficient for the covered property and rebuilding exposure, including applicable soft costs and debris removal where available. Do not automatically insure only the factory invoice.
Deductibles and Sublimits
A policy can have a high wind or wildfire deductible, a low transit sublimit, or restrictions on property in storage.
Record the ordinary deductible, special deductibles, sublimits, waiting periods, and exclusions in a one-page insurance summary.
Change Orders Can Create Underinsurance
If the scope grows, tell the broker or insurer promptly. Additional modules, upgraded finishes, solar, battery systems, decks, and site improvements may change the insured value and risk.
Keep written confirmation of any coverage changes.
The Lender's Requirements
Construction lenders often require specified insurance before releasing funds. The lender's requirements are a useful check, but they do not replace the owner's review of exclusions and coverage gaps.
Coordinate the builder's risk, permanent property policy, and lender's loss-payee or mortgagee requirements before closing or final disbursement.
When Does Construction Coverage End?
Do not assume builder's risk ends exactly when the permit is final. Policies can terminate or restrict coverage based on completion, occupancy, acceptance, expiration, or other policy-defined events.
Ask the insurer to identify the actual termination triggers and arrange the permanent policy so there is no unintended gap.
Temporary Occupancy Is a Coverage Question
Moving belongings into the house, renting it, or occupying one portion before full completion can affect coverage.
Before occupancy, ask whether the builder's risk policy permits it and whether permanent insurance has begun. A temporary Certificate of Occupancy is not an insurance endorsement.
After Move-In: The Permanent Policy
Once the home is occupied, confirm that the permanent policy accurately describes the dwelling, construction type, square footage, replacement cost, attached structures, and use.
Factory-built housing, HUD-code manufactured housing, and recreational vehicles are different categories. The insurer needs the correct classification.
Rentals and Short-Term Rentals
Do not assume an ordinary owner-occupied homeowners policy covers rental activity or short-term guest stays.
Disclose the intended occupancy and rental use and obtain coverage appropriate to that use. An insurer's treatment of an ADU or separate rental dwelling can differ from its treatment of the main house.
Solar, Batteries, and Other Equipment
Verify whether rooftop solar, ground-mounted solar, battery storage, generators, heat pumps, and detached equipment are included, excluded, or subject to special conditions.
Document equipment models, installation dates, costs, and commissioning records.
Insurance Is Not a Construction Warranty
An insurance policy may respond to covered loss; a manufacturer or contractor warranty addresses specified obligations to repair or replace work or products.
Neither automatically substitutes for the other. A leak caused by defective flashing can raise separate questions about correcting the flashing and covering resulting water damage.
Claims: Document the Loss Immediately
After damage, protect people and property, photograph the condition, notify the insurer promptly under the policy, and keep records of mitigation and repairs.
Preserve contracts, plans, delivery records, invoices, and communications. Avoid discarding important damaged components before reasonable documentation when circumstances permit.
A Certificate of Insurance Is Only a Starting Point
Request certificates from the relevant contractors and transporters, but also ask the broker or insurer to confirm the specific coverage that matters.
Certificates usually summarize information and do not themselves grant coverage. For high-value exposures, request the relevant endorsements or policy provisions and have a qualified insurance professional review them.
Questions to Send the Manufacturer
Ask who bears the risk of loss at the factory, during storage, at loading, during transport, at unloading, during crane/set, and after placement.
Ask for the applicable insurance arrangements and the procedure for reporting damage at each handoff. Get the answers in writing before shipment.
Questions to Send the General Contractor
Ask who procures builder's risk, who is insured, what offsite and transit exposures are included, whether subcontractors carry appropriate liability and workers' compensation coverage, and how the set operation is insured.
Ask who reports a loss, who pays deductibles, and who manages the claim.
Questions to Send Your Insurance Broker
Provide the complete project timeline and contracts. Ask for a written coverage-gap review that addresses factory storage, transit, crane/set, site work, existing property, catastrophic risks, occupancy, and the transition to permanent coverage.
Make sure the broker understands whether this is California Factory-Built Housing, manufactured housing, panelized construction, or another system.
The Insurance Responsibility Matrix
Create a worksheet with columns for project phase, property at risk, party bearing risk of loss, policy, carrier, limits, deductible, exclusions, and claim contact.
Leave no blank rows at the transfer points. An unanswered question is a risk to resolve before the next payment or delivery milestone.
Before Delivery Checklist
Confirm in writing: risk-of-loss transfer; transit insurance; storage coverage; loading/unloading coverage; crane/set coverage; module value; deductibles; contractor coverage; incident reporting; and who pays for delays or re-delivery after damage.
Also photograph the unit at the factory if available, at arrival, and before and after set.
Before Occupancy Checklist
Confirm construction coverage remains effective through the necessary work, that the permanent policy is bound for the correct date and use, and that the lender has the required evidence.
Retain policy declarations, endorsements, contact information, and the completed building file.
What an Insurance Review Cannot Promise
Even a well-designed insurance program cannot guarantee that every construction defect, delay, breach of contract, warranty dispute, or business failure will be covered.
Coverage depends on the policy wording, facts, exclusions, limits, endorsements, and applicable law. Have an insurance professional review the specific project rather than relying on a generic checklist.
The Bottom Line
Prefab insurance is a sequence of handoffs, not one checkbox.
The factory, carrier, crane operator, set crew, site contractor, owner, lender, and permanent insurer may each be involved at different stages.
Before the home leaves the factory, know who bears the loss if it is damaged at every step between production and occupancy.
The best time to find an insurance gap is before a truck is on the road or a crane is lifting your house.
Looking Ahead
Next: Prefab Project Closeout: The Documents, Insurance Records, and Warranties to Collect Before Everyone Leaves.
Buchanan Land Use Consulting helps California property owners evaluate prefab, modular, panelized, ADU, and residential projects, including permitting, site feasibility, access, and project-coordination issues.
References and Further Verification
California Department of Insurance: consumer guides to homeowners, wildfire, earthquake, and flood coverage — https://www.insurance.ca.gov/
California Contractors State License Board: contractor license, insurance, and owner-builder information — https://www.cslb.ca.gov/
California Department of Housing and Community Development: Factory-Built Housing program — https://www.hcd.ca.gov/building-standards/fbh
Federal Emergency Management Agency / National Flood Insurance Program — https://www.floodsmart.gov/
Always verify current policy terms and the applicable California regulatory requirements with the relevant insurer, broker, or agency.
