Protecting Your Investment at Every Phase
Insurance isn't exciting. Nobody gets into ADU investing because they love reading policy declarations. But insurance is the difference between a manageable construction hiccup and a financial catastrophe. A single uninsured event — a fire during construction, a liability claim from a contractor injury, flood damage to a completed unit — can wipe out the profit from your project and then some.
This chapter covers every insurance product you need at each phase of your ADU project, what to look for in a policy, and what it typically costs.
Phase 1: During Construction
Builder's Risk Insurance
What it is: A specialized policy that covers the structure under construction against damage from fire, theft, vandalism, wind, hail, and certain water damage events. It covers the building materials, fixtures, and equipment on-site.
Why you need it: Your standard homeowner's or landlord policy does not cover construction projects. If a fire destroys your half-built ADU, you're out the construction costs unless you have builder's risk.
Key coverage points:
- Covers the structure and materials on-site during the construction period
- Typically written for the total construction value (your rehab budget)
- Coverage period matches your expected construction timeline (6–12 months is standard; can be extended)
- Covers the main structure as well if the policy is written correctly
What it doesn't cover:
- Contractor errors or faulty workmanship (that's the contractor's problem)
- Theft of tools belonging to the contractor (they should have their own tool insurance)
- Flood damage (requires a separate flood policy)
- Earth movement / earthquake (requires a separate policy in seismic zones)
Typical cost: $1,500–$5,000 for a 12-month policy, depending on construction value and location.
Lender requirement: Most construction lenders, including Revolution Realty Capital, require builder's risk insurance as a condition of the loan. The lender will be named as an additional insured or loss payee.
General Liability During Construction
What it is: Liability coverage that protects you if someone is injured on your property during construction.
Who provides it: Your general contractor should carry their own general liability policy (and you should verify it — ask for the certificate of insurance). However, you should also carry your own liability coverage as the property owner. If a visitor, neighbor, or trespasser is injured on the construction site, you can be named in a lawsuit regardless of whether the contractor was at fault.
What to verify about your contractor's coverage:
- General liability: minimum $1M per occurrence / $2M aggregate
- Workers' compensation: required in most states for contractors with employees
- You should be named as an additional insured on the contractor's policy
Your coverage: If you own the property through an LLC, the LLC should carry general liability. If you own it personally, your personal umbrella policy may cover it — check with your insurance broker.
Vacant Property Insurance
What it is: If the main dwelling is vacant during the ADU construction (common for flip projects), your standard landlord or homeowner's policy may void coverage. Vacant property insurance covers the structure and liability for unoccupied properties.
Why it matters: Most standard policies exclude coverage after a property has been vacant for 30–60 days. If the main home is empty while you're building the ADU, you could have a gap in coverage.
Typical cost: $1,000–$3,000 per year, depending on property value and location.
Phase 2: Post-Construction (Rental Operations)
Landlord / Rental Property Insurance
What it is: A property insurance policy designed for investment properties. It covers the structure, liability, and loss of rental income.
Coverage components:
- Dwelling coverage: Covers the main home and the ADU structure against fire, wind, hail, theft, vandalism, and other named perils. Insure for replacement cost, not market value.
- Liability coverage: Protects you if a tenant or visitor is injured on the property and you're found liable. Minimum $300K; $500K–$1M recommended.
- Loss of rent / fair rental value: If a covered event (fire, major damage) makes the property uninhabitable, this coverage replaces the lost rental income during repairs. Critical for an ADU property where you have two income streams at risk.
- Other structures: The ADU, if it's a detached structure, may be covered under the "other structures" provision of your landlord policy. Verify that the coverage limit is adequate for the ADU's replacement cost.
Key considerations for ADU properties:
- Make sure the policy explicitly covers both the main dwelling AND the ADU. Some insurers classify the ADU as an "other structure" with a lower coverage limit (typically 10% of the main dwelling coverage). If your ADU cost $150K to build and your "other structures" limit is $40K, you're drastically underinsured.
- If the ADU is attached to or converted from part of the main dwelling, it should be included in the primary dwelling coverage.
- If you rent the ADU as a short-term rental (Airbnb, VRBO), standard landlord policies typically exclude STR activity. You need a policy that specifically covers short-term rentals, or a rider that adds it.
Important: Check your "other structures" coverage limit immediately. Many landlord policies cap it at 10% of the main dwelling — meaning a $400K home only covers $40K for the ADU. If your ADU cost $150K to build, you're $110K underinsured. Call your broker and fix this before your next premium renewal.
Typical cost: $1,200–$3,500 per year for a landlord policy on a single-family property with an ADU, depending on location, property value, and coverage limits.
Umbrella Insurance
What it is: An additional layer of liability coverage above your landlord policy. If a liability claim exceeds your landlord policy's limits, the umbrella policy kicks in.
Why you need it: Lawsuits happen. A tenant slips on an icy walkway, a guest is injured by a faulty railing, a fire spreads to a neighbor's property. Your landlord policy may cover $500K in liability. A serious injury claim can exceed that easily.
Typical coverage: $1M–$5M in additional liability protection.
Typical cost: $200–$500 per year for $1M in coverage. One of the best value-for-money insurance products available.
Pro Tip: At $200-$500/year for $1M in additional liability coverage, umbrella insurance is the single best dollar-for-cost protection in your portfolio. One slip-and-fall lawsuit can exceed your landlord policy's limits — the umbrella catches what falls through.
Flood Insurance
What it is: Coverage for damage caused by flooding. Standard property insurance policies explicitly exclude flood damage.
When you need it: If the property is in a FEMA-designated flood zone, your lender will require flood insurance. Even if it's not required, consider it if the property is in a low-lying area or has any flood history.
Where to get it: National Flood Insurance Program (NFIP) through your insurance broker, or private flood insurance (often cheaper for higher coverage limits).
Typical cost: $500–$3,000+ per year depending on flood zone designation and coverage amount.
Earthquake Insurance (Seismic Zones)
What it is: Coverage for damage caused by earthquake. Like flood, earthquake is excluded from standard property policies.
When you need it: If you're investing in California, the Pacific Northwest, or other seismically active areas. Not required by most lenders, but a significant uninsured risk.
Typical cost: $800–$5,000+ per year depending on location, construction type, and coverage amount. California Earthquake Authority (CEA) policies are available through most brokers.
Phase 3: If You're Selling
Title Insurance
What it is: Protects the buyer (and their lender) against title defects — claims, liens, or encumbrances that weren't disclosed at sale.
Your role as seller: You'll typically pay for the buyer's title policy as part of closing costs. This is standard in most markets and is already factored into the transaction costs in your RISE model.
ADU-specific title consideration: Make sure the ADU is properly permitted and that the certificate of occupancy is recorded. If you sell a property with an unpermitted ADU, you could face claims from the buyer post-sale.
Home Warranty (Optional)
What it is: A service contract that covers repairs to major systems (HVAC, plumbing, electrical) and appliances for 1 year after sale.
Worth it? Offering a home warranty can reduce buyer objections and make your property more attractive, especially if the ADU includes new systems. Cost is typically $400–$600, paid by the seller at closing. It can be a good marketing tool but isn't required.
Insurance Costs in Your RISE Model
Insurance is a carrying cost. Model it accurately in RISE:
During construction (in Monthly Carrying Costs):
- Builder's risk: divide annual premium by 12
- Vacant property insurance (if applicable): divide by 12
During rental operations (for DSCR modeling):
- Landlord policy: divide annual premium by 12
- Flood insurance (if applicable): divide by 12
- Enter the total monthly insurance cost in RISE's Insurance field
Example: Builder's risk at $3,000/year = $250/month during the construction phase. Landlord policy at $2,400/year = $200/month during the rental phase. These are different numbers for different phases — model the right one for the scenario you're running.
Risk Management Beyond Insurance
Entity Structuring
Holding investment properties in an LLC provides liability protection by separating your personal assets from your investment activities. If a tenant sues and wins a judgment that exceeds your insurance coverage, the LLC limits their claim to the assets within the LLC — not your personal home, savings, or other properties.
More on entity structuring and liability protection strategies in Chapter 11: Tax Strategy & Entity Structuring.
Contractor Verification
Before a single nail is driven:
- Verify the contractor's license with your state licensing board
- Request and verify their certificate of insurance (general liability + workers' comp)
- Confirm you're named as an additional insured on their general liability policy
- Keep copies of all insurance certificates in your project file
Documentation
Maintain a project file for every ADU deal that includes:
- All insurance policies and certificates
- Contractor license and insurance verification
- Permit documents and inspection reports
- Photos of the property before, during, and after construction
- All contracts, change orders, and payment records
- Certificate of occupancy
If a claim or dispute arises years later, this documentation is your defense.
Working with an Insurance Broker
Don't try to piece together insurance coverage yourself. Work with a commercial insurance broker who specializes in investment property and construction:
- They can bundle policies for better rates
- They understand lender requirements and can provide certificates in the format your lender needs
- They can advise on coverage limits based on your specific project
- As your portfolio grows, they can consolidate policies and negotiate volume discounts
Ask your lender for broker recommendations. Revolution Realty Capital works with investors regularly and can point you toward brokers who understand ADU project insurance requirements.
Insurance is a line item, not an afterthought. Budget for it in your RISE model from day one. The cost of being properly insured is a fraction of the cost of being uninsured when something goes wrong. Enter your monthly insurance costs in RISE and watch how they affect your returns — then make sure you're actually paying for the coverage you modeled.