Permits and Approvals on a Fairfield Renovation

This guide sets out the approvals a Fairfield renovation, addition or new house typically needs, from zoning, wetlands and historic district review to the building permit, inspections and the Certificate of Occupancy. Requirements depend on the property and the work, so confirm each point with Town Plan and Zoning and the Building Department before the design is fixed.

Fairfield applications are filed online. Town Plan and Zoning accepts permit applications only through CitySquared, and the Building Department uses the same system for building and trade permits.

Who reviews what in Fairfield

• Town Plan and Zoning (TPZ): zoning compliance permits, which zoning enforcement officers review and approve administratively for single-family houses and accessory structures such as pools, garages and sheds. TPZ is also the town's floodplain administrator and handles coastal site plan review.
• Town Plan and Zoning Commission: commercial, industrial, mixed-use and larger multi-family developments, rather than most single-family work.
• Zoning Board of Appeals: variances where a hardship on the lot prevents meeting the regulations. Talk to the Zoning Enforcement Officer first.
• Conservation Department and Commission: the Conservation Commission acts as the Inland Wetlands and Watercourses Agency. Staff issue Certificates of Wetlands Conformance, and the Commission decides Inland Wetland Permits.
• Historic District Commission: Certificates of Appropriateness in the Greenfield Hill, Southport and Old Post Road districts.
• Health Department: sanitarians review septic plans, issue permits and inspect, and the department issues well drilling permits.
• Sewer Department: permits to connect to, disconnect from or repair a connection to the sanitary sewer.
• Building Department: plan review against the Connecticut State Building Code, permits, inspections and the final certificate.

In Southport, the Harbor Management Commission also reviews proposals affecting Southport Harbor. See building and renovating in Southport.

The usual order of approvals

• Site questions first. Check the flood zone with TPZ, run the Conservation Department's wetlands screening tool, and confirm whether the house is in a historic district or on septic.
• Land use approvals. A wetlands certificate or permit, a Certificate of Appropriateness, a variance or coastal site plan review can each change the design, so they are typically settled before the permit drawings are final.
• Zoning compliance permit. Filed on CitySquared with the A-2 survey and the architectural plans.
• Building and trade permits. The building permit follows, with separate trade permit applications for electrical, plumbing, gas piping and HVAC work.
• Inspections. The Building Department inspects the work in stages, and inspections are booked through its office.
• Certificate of Occupancy or Approval. Every inspection must pass. After the final inspection, the certificate goes to the other departments that reviewed the permit for their approvals, and a copy is emailed once all have signed off.

Conditions that change a Fairfield project

Fairfield has about five miles of shoreline and six estuaries: Pine Creek, Mill River, Ash Creek, Turney Creek, Horse Tavern Creek and Sasco Creek. Development next to beaches, dunes, tidal creeks and marshes may be subject to coastal site plan review. Since October 1, 2025, Public Act 25-33 has prevented Connecticut towns from exempting new single-family houses within the coastal boundary from that review, and certain work in coastal flood hazard areas is now referred to the state Department of Energy and Environmental Protection for comment.

TPZ provides flood map determinations, and FEMA's study of the Saugatuck River watershed has produced preliminary revised maps for Fairfield, so check both the current and the preliminary map. A property in the flood zone that proposes new work must submit a substantial damage estimate form. When improvements pass the substantial improvement threshold, TPZ's flood mitigation regulations require the house to be made flood-safe, which can change the foundation, the first-floor height and the use of a lower level.

Wetlands are not always visibly wet, and many have to be delineated by a professional soil scientist. Work near one can need a staff-issued certificate or an Inland Wetland Permit from the Commission, which may include a public hearing, so ask Conservation staff before fixing where an addition or pool goes.

In the three local historic districts, nearly any change visible from a public street needs a Certificate of Appropriateness from the Historic District Commission. Visibility is judged as if trees and shrubs were not there, since they can be removed, so allow for this review before ordering exterior materials.

By the Health Department's estimate, about 15 percent of Fairfield homes use on-site septic systems. On those properties, any construction permit needs a sanitarian's review and sign-off. Taking down a whole house has its own set of Building Department documents, including an age verification form, sign wording and an affidavit for posting, and Preservation Connecticut lists Fairfield among the towns with a demolition delay ordinance.

What a complete submission includes

Ask TPZ and the Building Department what your project needs. A typical residential package includes:

• An A-2 survey, which TPZ requires for every proposed project, including accessory structures
• Architectural plans and any project details, as PDFs for upload
• Structural information where the work is structural, and energy code documentation under Connecticut's 2022 State Building Code, which includes the 2021 International Energy Conservation Code
• For a flood zone property, the substantial damage estimate form
• Copies of approvals already in hand, such as a wetlands certificate or permit, a Certificate of Appropriateness or a variance
• The Building Department's own required documents, such as the owner certification form or a signed contract and, for a pool, the enclosure agreement and the signed list of required pool inspections

The Building Department updated its required documents on August 1, 2025, so download current forms rather than reusing old ones.

Planning around the calendar

Staff-issued approvals, such as most zoning compliance permits and Certificates of Wetlands Conformance, follow a different path from decisions by the Conservation Commission, the Historic District Commission or the Zoning Board of Appeals, which meet on their own schedules and may hold public hearings. We plan permits and town approvals with your design team and build them into the schedule from the start.

Questions about permits in Fairfield

How do we apply for permits in Fairfield?

Online, through CitySquared. TPZ accepts zoning compliance permit applications only there, and the Building Department uses it for building and trade permits.

Does a single-family addition go to the Town Plan and Zoning Commission?

Usually not. Zoning enforcement officers review and approve most single-family projects administratively, including pools, garages and sheds. A variance, coastal site plan review or other approvals may still apply, depending on the lot.

What is a Certificate of Wetlands Conformance?

It is an administrative permit issued by Conservation Department staff for work such as an addition, pool, patio, shed, septic change or regrading that sits outside wetland soils but inside the regulated area around them. Work in or close to a wetland or watercourse needs an Inland Wetland Permit from the Commission instead.

Our house is in Southport. What extra reviews apply?

Southport is one of the three local historic districts, so exterior changes visible from a public street need a Certificate of Appropriateness. Work affecting Southport Harbor goes to the Harbor Management Commission, and lots near the water can raise flood and coastal questions as well.

We are on septic. What changes?

Every construction permit on a house with a septic system needs a review and sign-off from a Health Department sanitarian. For an addition, garage, pool or accessory structure, the state health code also calls for confirmation that room remains for a code-complying system, and soil testing may be needed.

What happens at the end of the project?

Once every inspection has passed, the Building Department sends the Certificate of Occupancy or Certificate of Approval to the other departments that reviewed the permit. Check with each of them that its conditions are met, and set the move-in date after the certificate is issued.

Next steps for a Fairfield project

See building and renovating in Fairfield for more on the town, and home additions in Fairfield if you are adding space. For an older house, our historic rehabilitation guide covers the state tax credit questions. Our other permits and approvals guides cover neighboring towns. To talk about your property, request a free consultation.