Fact-checked by the The Insurance Scout editorial team
Quick Answer
A home renovation can raise your homeowners insurance premium by 10–25% or more, depending on the project scope. As of July 2025, additions like a new roof, finished basement, or home office require a policy update to avoid coverage gaps. Always notify your insurer before breaking ground.
Home renovation homeowners insurance is not a one-time setup — it is an ongoing relationship that must be updated every time your property changes. According to the Insurance Information Institute, the value of your home directly determines how much coverage you need, and a major renovation can instantly create an underinsurance gap if your policy is not updated.
With U.S. homeowners spending a record amount on remodeling, understanding how upgrades affect your coverage is more urgent than ever.
Which Renovations Actually Affect Your Coverage?
Not every renovation triggers a policy change, but several common projects carry significant insurance implications. Additions that increase square footage, upgrade systems, or add high-value features almost always require a coverage adjustment.
Insurers assess your home based on its replacement cost value — the amount it would cost to rebuild from scratch. A kitchen remodel, bathroom addition, or finished basement raises that figure. Projects that add living space can increase replacement cost by $50,000 to $150,000 or more, depending on your region and materials.
High-Impact Renovation Types
The following project categories most commonly require a policy review:
- Room additions or garage conversions
- Kitchen or bathroom gut renovations
- Roof replacements (materials matter — metal vs. asphalt)
- Finished basements or attics
- Swimming pools, hot tubs, or trampolines
- Home offices or detached accessory dwelling units (ADUs)
- Solar panel installations
Swimming pools and trampolines specifically increase liability exposure. Insurers like State Farm and Allstate may require higher liability limits or even add an exclusion if you install a pool without notifying them. If you are curious why liability costs are rising industry-wide, see our breakdown of why liability insurance costs are exploding in 2026.
Key Takeaway: Renovations that increase square footage or add liability risks — such as pools or ADUs — can raise your home’s replacement cost by $50,000 or more, requiring an immediate policy update with your insurer per Insurance Information Institute guidance.
How Does a Renovation Change Your Premium?
Renovations can either increase or decrease your homeowners insurance premium, depending on the type of work done. Upgrades that reduce risk tend to lower premiums; additions that raise replacement value or liability tend to raise them.
Updating electrical, plumbing, or HVAC systems in an older home often leads to a 5–15% premium reduction, because modern systems are less likely to cause fire or water damage. By contrast, adding a finished basement or a home addition typically raises premiums because the insurer must now cover a larger, more valuable structure.
Renovation Impact on Premium: At a Glance
| Renovation Type | Typical Premium Impact | Why It Changes |
|---|---|---|
| New Roof (Impact-Resistant) | 5–20% decrease | Lower weather-damage risk |
| Room Addition | 10–25% increase | Higher replacement cost value |
| Swimming Pool | $50–$75/year increase | Increased liability exposure |
| Updated Electrical/Plumbing | 5–15% decrease | Reduced fire and water risk |
| Finished Basement | 10–20% increase | More insurable square footage |
| Solar Panels | Varies by coverage structure | Added property value, wind risk |
| Home Security System | 5–10% decrease | Reduced theft and loss risk |
The National Association of Insurance Commissioners (NAIC) notes that homeowners who fail to update their dwelling coverage after major renovations risk being underinsured by 20% or more at the time of a claim.
“Any time you add square footage, finish previously unfinished space, or significantly upgrade materials in your home, you need to call your insurer before the project starts — not after. The gap between your current coverage limit and your new replacement cost could cost you tens of thousands of dollars in a total loss scenario.”
Key Takeaway: Homeowners who skip a post-renovation policy review risk being underinsured by 20% or more, according to the NAIC. Risk-reducing upgrades like new roofs or security systems can actually lower your premium by up to 20%.
What Coverage Risks Exist During the Renovation Itself?
Your standard homeowners policy may not cover damage that occurs while construction is actively underway. This is one of the most overlooked gaps in home renovation homeowners insurance planning.
Most policies contain a vacancy or construction exclusion, meaning if a contractor leaves your home open to the elements and damage occurs, your insurer could deny the claim. Additionally, a contractor’s tools and materials stored on your property are typically not covered under your homeowners policy — they fall under the contractor’s own commercial coverage.
Builder’s Risk Insurance
For major renovations, insurers and construction attorneys commonly recommend adding a builder’s risk policy (also called a course-of-construction policy). This short-term policy covers the structure and materials during active construction. Costs typically run 1–4% of the total construction budget, according to the International Risk Management Institute (IRMI).
You should also verify that your contractor carries general liability insurance and workers’ compensation. If a worker is injured on your property and the contractor lacks workers’ comp, your homeowners liability coverage may be the only protection you have. For a broader look at how to evaluate your home coverage, our guide to understanding home insurance quotes walks through the key policy components to review.
Key Takeaway: Standard homeowners policies often exclude construction-period damage. A builder’s risk policy — costing roughly 1–4% of the project budget — fills this gap and is strongly recommended for any major renovation, per IRMI guidance.
How Do You Properly Update Your Homeowners Insurance After a Renovation?
Updating your home renovation homeowners insurance coverage requires a formal policy endorsement — not just a phone call. The process involves notifying your insurer, documenting the renovation, and requesting a revised replacement cost estimate.
Start by contacting your insurer or agent before the project begins. Provide project scope, contractor details, and the estimated increase in your home’s value. After completion, submit final invoices and, if required by your insurer, an updated home appraisal. Carriers like USAA, Travelers, and Nationwide all have formal endorsement processes for post-renovation coverage increases.
Steps to Update Your Policy
- Notify your insurer before construction starts.
- Confirm whether a builder’s risk policy is needed.
- Request a revised dwelling coverage limit (Coverage A) estimate.
- Submit contractor invoices and permits upon project completion.
- Ask about new discounts (e.g., new roof, updated systems).
- Review your liability limits if you added a pool or ADU.
According to Consumer Reports, homeowners should request a full replacement cost estimate every 3–5 years even without renovations, as construction costs inflate over time. With renovation, that review is immediately necessary. If you are selecting a policy for the first time or switching carriers, our guide on selecting the best home insurance company covers what to look for in a carrier.
Key Takeaway: A policy update after renovation requires a formal endorsement — not just a verbal notice. Homeowners should request a revised dwelling coverage estimate and review liability limits, especially after adding a pool or ADU. Consumer Reports recommends a full review every 3–5 years regardless.
What Happens If You Don’t Update Your Policy After Renovating?
Failing to update your policy after a renovation leaves you exposed to a coverage gap that becomes catastrophic in the event of a total loss. Your insurer will only pay up to your policy’s stated dwelling limit — even if rebuilding your newly renovated home costs far more.
This is called underinsurance, and it is more common than most homeowners realize. A CoreLogic underinsurance analysis found that approximately 66% of U.S. homes are underinsured, many by a margin of 25% or more. For a home with a $400,000 replacement cost and a $300,000 policy limit, that gap means absorbing $100,000 out of pocket after a disaster.
Beyond the financial loss, undisclosed renovations can also give insurers grounds to dispute a claim or void a policy under the doctrine of material misrepresentation. Premium increases are almost always smaller than the risk of carrying insufficient coverage. Given that insurance premiums are already climbing faster than paychecks, ensuring your coverage is accurate — rather than inflated or insufficient — is critical financial management. For first-time homebuyers navigating these decisions, our article on selecting the right home insurance offers a practical starting framework.
Key Takeaway: Approximately 66% of U.S. homes are underinsured according to CoreLogic, and renovations that are not reported to insurers widen that gap. An undisclosed renovation can give insurers grounds to dispute a claim under material misrepresentation doctrine.
Frequently Asked Questions
Do I need to tell my insurance company before I start a home renovation?
Yes — notify your insurer before construction begins, not after. Some policies contain construction exclusions that can limit or void coverage during active renovation. Your insurer may also require a builder’s risk policy for major projects.
Will a kitchen or bathroom remodel raise my homeowners insurance?
A significant kitchen or bathroom remodel typically raises your premium because it increases your home’s replacement cost value. High-end finishes like custom cabinetry or stone countertops raise rebuild costs, which means your dwelling coverage limit (Coverage A) should be increased accordingly.
Does adding a home office affect my homeowners insurance?
Yes, in two ways. First, finishing previously unfinished space increases your home’s replacement cost. Second, if you store business equipment or meet clients at home, your standard homeowners policy likely does not cover business-related liability or equipment losses — a separate endorsement or commercial policy may be needed.
Does a new roof lower homeowners insurance?
In most cases, yes. Replacing an aging roof with impact-resistant materials can reduce your premium by 5–20%, depending on your insurer and location. Carriers like Allstate and Travelers offer specific discounts for Class 4 impact-resistant roofing products in hail-prone regions.
What is builder’s risk insurance and do I need it for a renovation?
Builder’s risk insurance is a short-term policy that covers your home’s structure and on-site materials during active construction. It is recommended for any renovation exceeding roughly $50,000 in scope, as standard homeowners policies typically exclude construction-period damage. Costs run approximately 1–4% of the total project budget.
Can a home renovation affect my homeowners insurance claim if I never told my insurer?
Yes. Undisclosed renovations can be classified as material misrepresentation, giving your insurer legal grounds to reduce a claim payout or deny it outright. Always document renovations with permits and contractor invoices, and update your policy promptly after completion.
Sources
- Insurance Information Institute — Home Improvements and Your Insurance
- National Association of Insurance Commissioners (NAIC) — Homeowners Insurance Topic
- International Risk Management Institute (IRMI) — Builder’s Risk Insurance Definition
- CoreLogic — 2023 Underinsurance Report
- Consumer Reports — How to Update Your Homeowners Insurance
- FEMA — National Flood Insurance Program
- U.S. Department of Housing and Urban Development (HUD) — Residential Remodeling Data
