New Haven building department

New Haven’s Office of Building Inspection and Enforcement issues building, trade, sign and demolition permits for property inside the City of New Haven. It reviews plans, inspects work and enforces the Connecticut State Building Code. The office is in Room 501 at 200 Orange Street; Building Official Robert Dillon heads it. Nearby towns such as Hamden, West Haven and East Haven have their own building officials.

When a permit is required

The department’s owner guidance says permits are usually needed for new buildings; additions; residential projects such as decks, garages, fireplaces, pools and sheds; basement, attic and garage conversions and kitchen expansions; and electrical, plumbing (including water heaters and gas lines) and HVAC systems.

Work exempt from permit

New Haven’s Work Exempt from Permit sheet follows Section 105.2 of the 2022 Connecticut State Building Code. The most common exemptions:

Work	Exempt if…
Shed, playhouse or similar one-story detached accessory structure	200 sq ft or less
Fence (not a pool barrier)	7 feet high or less
Retaining wall	3 feet or less, with no surcharge
Sidewalks, driveways, on-grade patios	No more than 30 inches above grade, no guards required, not over a basement, not part of an accessible route
Prefabricated pool at a one- or two-family home	Above ground, 24 inches deep or less, and 5,000 gallons or less
Window awnings (R-3 and U occupancies)	Project no more than 54 inches and need no extra support
Finish work	Painting, papering, tiling, carpeting, cabinets and countertops with no structural change

Decks are not on New Haven’s exemption list. Portable appliances, minor electrical repairs, self-contained refrigeration systems with 10 pounds or less of refrigerant, and clearing plumbing stoppages are also exempt. Fences and other structures on corner lots in residence districts must also meet the corner-visibility rule in Section 28 of the city’s zoning ordinance.

Applying in City Squared

The department permits electronically and does not accept paper applications. Apply through the City Squared portal any time, or use the computer kiosks in the office during business hours. Contractors applying online need:

• a copy of their current state contractor license
• proof of workers’ compensation and liability insurance, or a notarized Workers’ Compensation Form 7B if they have none
• clear plans or floor plans (handwritten measurements must be legible)

An agent may file for a contractor only with a signed agent letter. The letter must give the contractor’s name, address, phone and license number (with a copy attached), the agent’s name, the work address including floor or unit, and a real description of the work (“Per Plans and Specs” is not accepted).

Before a permit is issued, the application collects sign-offs in this order: Fire, Zoning, WPCA (if applicable), then Building. For the Health Department sign-off, call 203-946-8046 after the first two signatures are in and leave the application number. Full demolitions also need zoning approval from City Plan at 165 Church Street, 5th floor. Lifts, dumpsters, scaffolding or sidewalk closures in the street or sidewalk need a separate Obstruction Permit, which is also filed online.

Fees

Building, sign, electrical, plumbing and HVAC permits use the city’s construction-cost schedules. Online filing may add a third-party processing fee. Sample amounts:

Construction cost	1–2 family	3+ family, commercial, mixed use
$1,000	$50.26	$55.26
$10,000	$295.60	$372.60
$50,000	$1,386.00	$1,783.00
$100,000	$2,749.00	$3,546.00

Electrical and plumbing/mechanical permits are checked against the city’s published minimum acceptable costs. Demolition and revised-estimate fees follow separate schedules.

Certificate fees are charged on top of the permit fee:

• Certificate of Occupancy, required for a change of use (for example, a two-family to a three-family). Residential: $50 for the first new unit and $30 for each additional unit. Commercial: $55 for 20,000 sq ft and $35 for each additional 10,000 sq ft. Request it from your inspector once all work passes, and before any tenant moves in.
• Certificate of Approval (Certificate of Completion), for work that doesn’t need a CO: $30. A trade permit tied to a building permit that has already paid the certificate fee doesn’t pay it again.

The CO requirements checklist (revised September 9, 2024) can include sign-offs from Engineering, Traffic and Parking, City Plan, Health and the Fire Marshal, plus final mechanical, electrical and building inspections. Depending on the project, it may also require letters of substantial compliance, a final statement of special inspections, a state elevator sign-off, or a flood-zone as-built elevation certificate.

Inspectors and records

Inspectors keep in-office hours for questions. Availability may vary by inspector.

Discipline	In-office hours
Building	8:30 a.m.–12 p.m.
Electrical	8:30–10 a.m.
Plumbing/mechanical	8:30–10 a.m.

The department is scanning its property records. Walk-in research hours are Tuesday and Thursday from noon to 2 p.m., and no research is done by phone. Recent permits can be viewed in City Squared, but older permits and certificates may not be online. The department has forms for FOI copy requests, research letters (for buildings with no CO on file, since COs weren’t required until the early 1970s), releasing violations from the land records, removing a contractor from a permit, and terminating a permit before work starts.

Work done without permits

The building official’s written guidance says that unpermitted finished basements, attics and similar spaces won’t get a conditional CO. The owner must obtain permits and open up finished work as needed for inspection. The department notes that the Assessor, real estate agents and home inspectors often bring such work to its attention.

Codes and contractors

New Haven enforces the 2022 Connecticut State Building Code, based on the 2021 International Codes, for applications filed since October 1, 2022. The state’s 2026 code, based on the 2024 I-Codes and the 2023 NEC, was due July 1, 2026, but is delayed pending legislative regulation review.

Home improvement contractors working for homeowners must register with the Connecticut Department of Consumer Protection. Homeowners working on their own property, subcontracted work, trade-licensed work, commercial work, and contracts under $200 are excluded. Electricians, plumbers and HVAC contractors hold state trade licenses, which you can check through the state’s license lookup.