Mill rate source: CT Office of Policy and Management · FY 2024–2025 · Assessment ratio: 70% (CT state law)
These estimates use Connecticut's 70% assessment ratio and official FY 2024–2025 mill rates. Actual taxes depend on your assessor's valuation of the completed project, applicable exemptions, and any special district overlays. Construction cost is estimated from regional CT averages if not entered manually. Always verify with your local town assessor before making financial decisions.
Every mill rate below is sourced from the CT Office of Policy and Management for FY 2024–2025. You can also view the full official dataset on the Connecticut Open Data portal.
Mill rates shown are for real and personal property. Motor vehicle rates may differ. Assessment ratio: 70% of fair market value per CT state law.
Connecticut assesses all property at 70% of market value by state law. Builtly estimates the value your project adds, then applies your town's official mill rate.
Annual tax = (assessed ÷ 1,000) × mill rate
Mill rates come directly from the CT Office of Policy and Management and are updated each fiscal year.
800 sq ft addition added
Est. value added: ~$136,000
New home value: $536,000
Assessed at 70%: $375,200
Hebron mill rate: 35.67
Current taxes: $9,828/yr
New taxes: $13,381/yr
Tax increase: ~$3,553/yr · $296/mo