Home Insurance After a Renovation: What You Need to Update
A major kitchen or bathroom renovation increases your replacement cost by $30,000–$100,000. If you don't update your insurance after renovating, you're carrying a coverage gap from day one.
Quick Answer
After any renovation costing more than $20,000, increase your dwelling coverage limit by at least the cost of the renovation (×1.1 for the standard buffer). Notify your insurer during the renovation for large projects. Most policies require notification for projects over a certain size. After completion, run a full replacement cost recalculation to verify your new total.
Renovation Creates an Immediate Coverage Gap
The moment a renovation project is complete, your home's replacement cost has increased. If your dwelling coverage limit hasn't increased to match, you have a coverage gap, and you've had it since the day the contractor left.
This isn't a theoretical risk. Fires, water damage, and storms don't respect renovation timelines. A kitchen fire the week after you finished a $75,000 renovation could cost you $75,000 out of pocket if your coverage wasn't updated to include the new value.
This guide covers every step of managing your insurance before, during, and after a renovation.
Before the Renovation Starts
Check your policy for notification requirements. Most standard HO-3 policies require you to notify your insurer if you're undertaking a renovation above a certain dollar threshold, typically $5,000–$10,000. Failing to notify can give the insurer grounds to dispute a claim that occurs during construction.
Verify your contractor's insurance. Your contractor should carry:
- —General liability insurance (minimum $1 million per occurrence)
- —Workers compensation insurance for their employees
Ask for certificates of insurance before work starts. If a contractor's worker is injured on your property and the contractor doesn't have workers comp, you may be liable.
Check for a "vacancy" or "construction in progress" exclusion. If your renovation is extensive enough that you'll be living elsewhere during construction, some insurers require a builder's risk or renovation policy rather than a standard homeowners policy. Vacant homes are often excluded from certain coverage under standard policies. Confirm with your agent.
Get a baseline replacement cost estimate. Before the renovation, run our home replacement cost calculator to document your current replacement cost. This establishes a before-picture you can compare to the after.
During the Renovation
Notify your insurer at the start of significant projects. A call or email to your agent at the start of a major renovation is a simple precaution. Document the date, the nature of the project, and the estimated cost. This creates a paper trail showing you disclosed the renovation.
Keep all receipts, contracts, and invoices. If you ever need to file a claim that involves the renovation work, detailed cost documentation is invaluable. Your insurer may request this to properly assess the value of the renovated components.
Request a temporary coverage increase if needed. For very large projects ($100,000+), ask your insurer whether a temporary construction-phase endorsement is advisable. This covers materials stored on-site before installation and protects against theft or damage during construction.
After the Renovation: Updating Your Coverage
This is the most commonly skipped step, and the most important.
Step 1: Recalculate your replacement cost. The simplest approach is to use our home replacement cost calculator with updated inputs. If your renovation added finished square footage (room addition, finished basement), enter the new total. If it improved quality (a kitchen or bathroom renovation that brought finishes from standard to good), update your quality grade selection.
Step 2: Estimate the increase. As a rough guide:
| Renovation | Typical Replacement Cost Increase |
|---|---|
| Full kitchen renovation (mid-range) | +$30,000–$60,000 |
| Full kitchen renovation (high-end) | +$60,000–$120,000 |
| Primary bathroom renovation (mid-range) | +$15,000–$35,000 |
| Primary bathroom renovation (luxury) | +$35,000–$80,000 |
| Room addition (per 100 sq ft, standard) | +$18,000–$25,000 |
| Finished basement (per 100 sq ft) | +$10,000–$18,000 |
| Roof replacement (architectural shingle) | +$15,000–$30,000 |
Step 3: Multiply by 1.1. Add a 10% buffer to the renovation cost increase to account for the 110% recommended coverage buffer.
Step 4: Add to your current limit. If your current dwelling limit is $380,000 and your renovation added $66,000 (renovation cost of $60,000 × 1.1), request a new limit of $446,000.
Step 5: Call your agent. Request the specific limit increase. Ask whether the insurer needs photos of the completed renovation, contractor receipts, or any other documentation.
Special Situations
Adding an accessory dwelling unit (ADU). A detached ADU (a guesthouse, in-law unit, or garage conversion) is typically covered under Coverage B (other structures). Notify your insurer, verify Coverage B is adequate, and ask about liability coverage for the unit.
High-end renovations changing quality grade. If your home goes from standard to excellent quality finishes (think a major whole-home renovation), the percentage increase in replacement cost is significant. A 2,000 sq ft standard home costs $371,000 to rebuild; the same home with excellent-quality finishes costs $557,000. That's an $186,000 increase for finishes alone, plus the location factor. Re-run the full calculation after a quality-changing renovation rather than just adding the renovation invoice to your current limit.
Permitted vs. unpermitted work. If you had work done without permits, be cautious about what you tell your insurer. Unpermitted work can complicate a claim. If the work was done in a way that violates code, the insurer may dispute whether they need to pay for reconstruction that meets current code. If you have significant unpermitted work, consult with an insurance attorney before filing a claim that involves it.
Historic or architecturally significant homes. Renovations to historic homes that restore or replicate original materials (original plaster, period-appropriate windows, custom millwork) can increase replacement cost dramatically because those materials are expensive to source. Standard databases don't always capture this well. Consider a professional appraisal after a significant renovation on a historic property.
The Bottom Line on Renovation and Insurance
Every renovation is a coverage gap waiting to happen if you don't update your insurance. The fix is simple, fast, and usually costs $10–$30/month in additional premium for $100,000 of additional coverage.
Before any renovation over $20,000: notify your insurer.
After any renovation over $20,000: recalculate and update.
Run your updated replacement cost estimate now if you've completed a renovation recently. Then check our seven signals that coverage needs updating and our complete coverage update guide for the full checklist of what to do.