Enter renovation and risk details
Example data table
| Scenario | Home value | Current dwelling | Renovation budget | Scope | Occupancy | Recommended dwelling | Builder's risk limit |
|---|---|---|---|---|---|---|---|
| Kitchen upgrade | $320,000 | $240,000 | $45,000 | Moderate | Occupied | $291,000 | $0 |
| Major remodel | $450,000 | $300,000 | $90,000 | Major | Partially | $405,000 | $105,000 |
| Structural addition | $600,000 | $420,000 | $160,000 | Structural | Vacant | $625,000 | $210,000 |
Formula used
- Escalated renovation budget = Budget x (1 + Overhead%) x (1 + Contingency%) x (1 + Escalation%).
- Project exposure = Escalated budget + Permits + (Escalated x Ordinance%) + (Escalated x Debris%).
- Recommended dwelling limit = max(Current dwelling limit, Current dwelling limit + Project exposure).
- Builder's risk limit = Project exposure (enabled by selection or auto rules).
- ALE limit = Living expense per month x Living expense months.
- Estimated property premium = (Rated exposure / 1,000) x Base rate x Risk multipliers x Deductible factor.
- Estimated annual premium = Property premium + Liability premium estimate + (ALE limit x 1%).
How to use this calculator
- Enter your home value and current dwelling coverage limit.
- Add your renovation budget and supporting costs like permits.
- Choose overhead, contingency, and escalation based on your project.
- Select occupancy, renovation scope, and risk levels for your area.
- Provide deductible, liability, and temporary living expense assumptions.
- Click Calculate Coverage to see recommendations and premiums.
- Download your results as CSV or PDF for sharing and recordkeeping.
Renovations change your risk profile
A renovation temporarily increases both the value at risk and the frequency of loss scenarios. Open walls, new electrical work, stored materials, and contractor traffic can raise exposure compared with normal occupancy. Even projects that feel small can push replacement costs higher than a current dwelling limit anticipates.
Estimating the project exposure
A useful planning approach is to treat the renovation budget as the starting point, then stress-test it with overhead, contingency, and cost escalation. Adding ordinance-and-law and debris allowances helps capture post-loss costs that often surprise homeowners. The calculator summarizes this as a single project exposure figure used to size builder's risk and incremental dwelling needs.
When builder's risk becomes important
Builder's risk becomes more relevant when the home is vacant, the scope is major, or structural elements are affected. Vacancy can change how policies respond, while larger projects introduce more theft and fire exposure. If your contractor requires proof of coverage, the builder's risk limit can be aligned to the project exposure so materials and partially completed work are not underinsured.
Liability and temporary living expenses
Renovations increase third-party liability exposure because visitors and workers may be present more often. Many homeowners choose higher liability limits during construction, especially when high-value claims are plausible. Temporary living expenses are also worth sizing if a covered event makes the home unlivable; using a monthly cost and realistic duration creates a practical ALE limit.
Turning results into a coverage conversation
Use the outputs as a checklist: updated dwelling limit, builder's risk limit (if applicable), on-site personal property value, and ALE and liability targets. Share the CSV or PDF with your insurer and contractor, then confirm what your policy covers during renovation, any vacancy rules, required endorsements, and certificate wording. Accurate limits reduce the chance of underinsurance while helping you budget premiums.
FAQs
Does my standard homeowners policy cover renovations?
Often yes, but coverage can be limited by vacancy, scope, or contractor requirements. Confirm endorsements, builder's risk needs, and whether materials and partially completed work are covered during construction.
What is builder's risk insurance?
Builder's risk generally covers the structure and materials during construction. It can address theft, fire, and weather damage to work in progress, depending on the policy terms and exclusions.
How do I estimate ordinance and law coverage?
Use a percentage of the escalated renovation cost as a planning allowance. Code upgrades after a loss can add meaningful costs, especially for electrical, plumbing, or structural work.
Why does occupancy matter during renovation?
Vacant or partially occupied homes can face higher theft and unnoticed damage. Some policies restrict coverage when a home is vacant beyond a set number of days.
How should I choose a liability limit?
A common planning approach is to align limits with potential claim severity, contractor agreements, and your assets. The calculator suggests a rule-of-thumb based on home value, but your situation may require more.
Are the premium estimates a quote?
No. The calculator uses simplified rates and multipliers to help you budget. Actual pricing depends on insurer models, location, construction details, claims history, and policy form.