Across 188 permits filed since 2025-01-25, the median is $11,500; half of projects fall between $3,174 and $29,216. Figures are permit valuations reported to building departments. National cost guides answer this question with averages from other markets; these numbers are what homeowners in New Haven, CT actually reported when they pulled permits.
Recent filings
- Wire addition and bathroom to code and owner spec. Wire kitchenCity of New Haven · 2026-07-23$12,000
- Removing 200LF of 8'H Wood Fence and replacing in same footprint 199LF of 8'H Wood Fence. Any other work will require additional permits. Certificate of Approval 2022 CSBCCity of New Haven · 2026-07-20$17,362
- Remove and replace front porch with new landing and stairs with handrail and guards. Old porch did not have continuity. Any other work will require additional permits. Landing is 36"x 36" wide. Stairs maintain 8".25 x 9". Handrail is betweCity of New Haven · 2026-07-20$12,000
How to read these numbers
Permit valuations are the project cost the applicant reports to the building department. They skew slightly low — nobody rounds up for the permit fee — and scope varies, so the middle-half range is the honest picture: half of all home addition permits in New Haven, CT came in between $3,174 and $29,216. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
Same project, other places
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