You spent $30,000 turning your detached garage into a sweet Accessory Dwelling Unit (ADU) for your mother-in-law. To save money and avoid property tax hikes, you didn’t pull permits for the plumbing or electrical. One night, a faulty wire in the new walls sparks a fire, burning the ADU to the ground.
You file a claim, expecting your “Other Structures” coverage to pay for the rebuild. The adjuster arrives, checks the municipal records, and finds no permits for a residential dwelling.
The Brutal Truth: Why Standard Policies Deny This Claim
Your insurance policy relies on the legal definition of your property. If city records say “Unfinished Garage,” and the adjuster finds the remains of an unpermitted residential apartment, you trigger the Increased Hazard Exclusion.
By wiring a kitchen and bathroom without code enforcement, you materially changed the risk profile of the structure without notifying the insurer. If the fire marshal determines the blaze started from your unpermitted, DIY electrical work, the carrier will deny the claim for Faulty Workmanship and illegal construction.
How to Actually Protect Yourself (The Fix)
- Pull the Permits (Retroactively if Necessary): The only true fix is to have the city inspect and legalize the ADU. Pay the fines; it’s cheaper than a denied $100,000 fire claim.
- Update “Coverage B” Limits: Standard policies only cover “Other Structures” at 10% of your main house value. If your ADU cost $80k to build, you must specifically raise your Coverage B limit.
- Declare the Use: Tell your broker the structure is an occupied dwelling, not a storage garage, so it is rated correctly.
The Claims Adjuster’s Secret
I will pull the Google Earth historical street view. If I see a garage door in 2021, and suddenly see a sliding glass door and an AC unit in 2023, I know exactly when the illegal conversion happened, giving me grounds to investigate for policy misrepresentation.
The Verdict (TL;DR)
The Risk Level: High (Fires starting in unpermitted wiring are almost auto-denied). The Solution: Pull retroactive permits, declare the ADU to your broker, and raise your Coverage B limits. Estimated Cost: Varies by city for retroactive permits; $50–$100/year to increase Coverage B.