Town of Southold, New York Building Permit Guide

Building permits in the Town of Southold come from the Building Department at the Town Hall Annex, 54375 Route 25, Southold (631-765-1802, weekdays 8 am to 4 pm), for the whole town outside the Village of Greenport. A new house or addition is $250 plus $0.50 per square foot, plans must carry a New York engineer’s or architect’s seal, contractors and electricians need Suffolk County licenses, and work within 100 feet of a wetland may also need a Town Trustees permit.

What requires a building permit in Southold?

Chapter 144 of the Town Code requires a permit for any work that must meet the Uniform Code or Energy Code. Its exemption list, last revised in May 2023, carves out one local exception worth knowing: alterations to an existing building costing less than $10,000 need no permit if they leave structure, fire safety features and exits alone and add no electrical system or solid-fuel appliance.

An exemption from the building permit is not an exemption from other town approvals. Section 144-8 says exempt work must still comply with the zoning law, the application warns that work within 100 feet of a tidal or freshwater wetland may need a Trustees permit, and electrical work is filed and inspected separately.

What Southold decides and what the state sets

The Uniform Code and Energy Code are the building standards. Southold sets its fees by Town Board resolution and has its own rules on electrical wiring (Chapter 126), wetlands and shorelines (Chapter 275), coastal erosion (Chapter 111), waterfront consistency review (Chapter 268), flood damage prevention (Chapter 148), landmarks (Chapter 170), stormwater (Chapter 236), rental permits (Chapter 207) and zoning (Chapter 280).

Southold building department: who handles permitting

The Building Department reviews applications, issues permits and certificates of occupancy, inspects construction and carries out fire safety and property maintenance inspections. Michael J. Verity is the Chief Building Inspector. The Fire Marshal works from the same office, and code complaints have their own line.

Village of Greenport. Greenport is the town’s only incorporated village (2,590 of Southold’s 24,260 residents, Census 2025 estimate). It has its own Building Department and Code Enforcement, its own 2025 building fee schedule and its own Planning Board, Zoning Board of Appeals and Historic Preservation Commission, so town permits do not apply inside the village.

Southold permit types and filing rules

Residential permits

The building permit application must be complete, signed and notarized; an owner’s authorization is needed when someone else applies. It goes in with a survey or site plan drawn to scale showing the lot, buildings, nearby streets and waterways, four sets of plans with the original seal of a New York licensed engineer or architect, and the contractor’s Suffolk County license plus workers’ compensation (C-105.2 or U-26.3), disability (DB-120.1) and liability certificates. Depending on the job the department may also ask for Suffolk County health approval, Zoning Board, Planning Board or Historic Preservation Commission approval, a floodplain development permit, Trustees and DEC permits, REScheck or COMcheck, Manual J, D and S heating and cooling calculations, the truss notice, a single and separate title search, and a curb cut permit from the state or on Suffolk County form 239F. The owner, contractor and designer are responsible for drainage under Chapter 236, and the town posts a stormwater management form.

Other forms on the department’s page cover pre-existing certificates of occupancy, signs, tents and the plumber’s certificate. Renting out a dwelling needs a rental occupancy permit under Chapter 207 (2018), valid for 24 months, with fees set by the Town Board; it issues only for a unit with a valid certificate of occupancy or pre-existing certificate, after an inspection by the town’s code enforcement official or a report on the town form from a New York licensed engineer, architect or home inspector.

Building or remodeling a home here? Alliance handles residential permit filing, so the crew isn't waiting on the counter.

Commercial permits

Hotels, motels, multiple dwellings, businesses, industrial buildings and wineries pay $300 plus $0.50 per square foot for new buildings, additions and alterations; farm buildings are a flat $200 each. Commercial electrical inspections start at $150 and run $0.12 per square foot for new construction or renovation. Tents for events at any property other than a single-family home need a permit, issued for up to 30 days, and a tent will not be approved while the parcel has an open building permit, a pending site plan review or an open code violation.

For tenant improvements and new commercial builds, Alliance handles commercial permit expediting through issuance. More on this: commercial building permits explained.

What comes before the building permit

• Town Trustees: permits may be required for work within 100 feet of a tidal or freshwater wetland. Since April 2023 a full wetlands permit filing fee is $1,250, including the first site visit; an administrative permit is $250, a pre-application site visit $150, and inspections $50 a visit, with fees doubled for work already built without a permit. Marine contractors doing bulkheads, docks and similar coastal work need a town coastal contractor license under Local Law 16 of 2017.
• NYS DEC: work within 300 feet of a tidal wetland or 100 feet of a freshwater wetland may also need a state permit.
• Suffolk County Health Services: new homes and additions, remodeling, conversions or sanitary upgrades may need Office of Wastewater Management approval under the county Sanitary Code, and the original approval is needed again before the certificate of occupancy.
• Planning Board, Zoning Board of Appeals and Historic Preservation Commission where zoning or landmark rules apply.
• Flood zones: Southold and Greenport take part in the National Flood Insurance Program under flood maps dated September 25, 2009; the town has its own floodplain development permit application.

Southold building permit fees

Chapter 144 leaves fees to Town Board resolution, and the Building Department posts the current schedule. Section 144-11A says fees are paid when the application is filed, and the fee page says the same; the current application form instead says the department calculates the final fee from the schedule and collects it after the permit is written, so ask which applies when you file.

A new 2,000 sq ft house therefore carries a $1,250 building permit ($250 plus 2,000 × $0.50), a $200 residential electrical inspection fee for its size band and a $100 certificate of occupancy. Renewing an expired permit costs half the original fee, and if an application is refused before any work starts, half the fee is refunded.

Trade permits and who may pull them

Electrical. Electrical work is filed separately on the town’s electrical inspection form, and the electrician must hold an active Suffolk County license. Chapter 126 says the building inspectors never have to do electrical inspections themselves; it designates the inspectors of the New York Board of Fire Underwriters as the town’s electrical inspectors, and the Town Board sets the fee. The price list dated November 16, 2018 charges homes by size: $100 up to 500 sq ft, $150, $175, $200 and $250 through the middle bands, $275 for 3,501 to 4,500 sq ft and 10 cents a square foot above that, plus $100 for a service, $125 for a pool or hot tub or solar system, $100 for a generator and $25 for each extra meter. Unpermitted electrical work pays double. Chapter 126 also bans aluminum wire of No. 4 AWG and smaller in new buildings, alterations and service replacements; larger aluminum conductors are allowed only with UL-approved compression connectors.

Plumbing. The town posts a plumber’s certificate form, and a plumber’s affidavit is one of the documents needed before the certificate of occupancy.

Contractors. Suffolk County’s Department of Consumer Affairs licenses home improvement contractors and master and restricted electricians; check a license with the county’s online search before hiring. The town application asks for the contractor’s county license with every filing, and coastal work also needs the Trustees’ coastal contractor license.

Septic. Sanitary systems are approved by the Suffolk County Department of Health Services, which keeps a list of approved innovative and alternative treatment systems; the county’s original approval goes to the town before occupancy.

How to apply for a Southold building permit

Review, corrections and what causes delay

Incomplete applications are not accepted, and the department does not publish a review time. Where they apply, approvals from county health, the Trustees, DEC and the town boards must be in hand before the permit can issue. A refused application costs a $100 notice of disapproval. Under Section 144-8, as amended in 2023, a permit is void if work does not start within six months and expires 12 months after issue; the current application form still describes an older 12-month start and 18-month completion window with a possible six-month extension, so confirm the dates printed on your permit.

Southold inspections and certificates

The applicant, owner or contractor must call the Building Department at 631-765-1802, with the permit number, for each inspection, and the work must stay exposed until it is accepted. The application lists the stages: footing reinforcement or pier excavation before the pour, the footing keyway with foundation wall reinforcement, the foundation before backfill, damp proofing, framing with tie-downs and strapping and plumbing, underground plumbing, perimeter insulation, rough electric, insulation and caulking, solid-fuel appliances and chimneys, energy code compliance and the final. Electrical inspections follow their own sequence: temporary and final service checks, a trench inspection for underground service, then rough wiring before insulation and the final.

After the inspections, the certificate of occupancy needs the original Suffolk County health approval, the plumber’s affidavit and any certifications the plans examiners ask for. No building may be used until the certificate issues; for older houses without one, the town issues a pre-existing certificate of occupancy for $200.

New York building code

New York builds on one statewide code, the Uniform Code, outside New York City; the 2025 edition and 2025 Energy Code took effect on 31 December 2025 (the all-electric provisions remain suspended by court order). Cities, towns and villages administer it, and local standards stricter than the code need Code Council approval. The Uniform Code in New York

Southold permit FAQ

Does Southold Town issue permits in Greenport?

No. The Village of Greenport has its own building department at 236 Third Street (631-477-0248) and its own fee schedule.

How much is a building permit for a new house in Southold?

$250 plus $0.50 per square foot of floor area, so $1,250 for 2,000 sq ft, plus electrical inspection and certificate of occupancy fees.

Do I need a permit for a small interior renovation?

Not if the alteration costs less than $10,000 and touches no structure, fire safety feature, exit or electrical system and adds no solid-fuel heater; otherwise yes.

Do I need a permit for a fence?

Ordinary fences are exempt from a building permit, but pool enclosures need one and deer fencing has a $100 permit.

Does my contractor need a license?

Yes. The town asks for the contractor’s Suffolk County license, and electricians must hold an active county license.

Do I need a Trustees permit?

Possibly. The town application says Trustees permits may be required for work within 100 feet of a tidal or freshwater wetland; a full wetlands application is $1,250.

How much are solar or generator permits?

$325 each, covering the building permit, electrical inspection and certificate of occupancy.

Do I need a permit to rent out my house?

Yes, a rental occupancy permit under Chapter 207, valid for 24 months; the unit must have a certificate of occupancy or pre-existing certificate and pass an inspection.

What does it cost to renew a permit?

Half of the original permit fee.

Permit search and official resources

Southold posts digital town records on its Laserfiche WebLink site. For a specific building permit, certificate of occupancy or plan, ask the Building Department or file a Freedom of Information request with the Town Clerk; copies of certificates of occupancy cost $0.25.

• Building Department
• Building Department fee schedule
• Building Department forms and links
• Building permit application and checklist
• Electrical inspection price list
• Town Code Chapter 144, Fire Prevention and Building Code Administration
• Town Code Chapter 126, Electrical Inspections
• Board of Trustees permits
• Trustees fee schedule (Resolution 2023-376)
• Town records on Laserfiche WebLink
• Suffolk County residential wastewater permits
• Suffolk County Consumer Affairs licensing
• Suffolk County Home Improvement License Law
• Village of Greenport building department
• NYS code adoption notice

Simplify Town of Southold permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in New York. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Town of Southold permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.