Sunroom Permits Nassau & Suffolk County — What to Know

Do you need a permit for a sunroom on Long Island?

Yes. Every attached sunroom, patio enclosure, screen room, or room addition requires a building permit in Nassau and Suffolk County — no exceptions for size, and no grandfather clauses for "it's just screens."

The permit ensures:

• The structure meets local building code
• The foundation is adequate
• Snow load and wind requirements are satisfied
• The work is inspected by a licensed official

Unpermitted work is a problem at resale (title companies flag it), can void your homeowner's insurance, and can result in the town requiring removal.

Nassau County permit process

Permit authority in Nassau County depends on your municipality. Most Nassaus County homeowners fall under their respective town building department:

• Town of Hempstead (largest town in the US by population): Building Division handles permits for Levittown, Valley Stream, Lynbrook, Rockville Centre, Merrick, Bellmore, Wantagh, Seaford, Oceanside, and more.
• Town of Oyster Bay: Handles permits for Massapequa, Bethpage, Hicksville, Farmingdale, Oyster Bay, and surrounding communities.
• Town of North Hempstead: Garden City, Manhasset, Port Washington, Great Neck, New Hyde Park.
• City of Long Beach and City of Glen Cove: Their own city building departments.

Typical Nassau County timeline: 4–8 weeks for permit approval, depending on the town and the current backlog.

Suffolk County permit process

Suffolk County has five townships with their own building departments:

• Town of Huntington: Building Division on New York Ave
• Town of Babylon: Building Division in Babylon Village
• Town of Islip: Building Department at Town Hall
• Town of Smithtown: Building Department, Smithtown
• Town of Brookhaven: Building Department, Farmingville

Typical Suffolk County timeline: 3–7 weeks, with Brookhaven often faster than Huntington.

What documents are required

For a standard sunroom permit application, we typically prepare and submit:

• Survey of the property (you may have this; if not, we coordinate a survey)
• Site plan showing the proposed addition location and setbacks
• Construction drawings (floor plan, elevations, cross-sections)
• Structural details (for four-season rooms and glass rooms: engineer-stamped drawings)
• Energy compliance notes (for conditioned space)
• Completed permit application form and fee payment

We handle everything on this list. You sign the application as the property owner.

We handle all of this for you

We file every permit application for every project we do. You don't need to visit the building department, understand the forms, or deal with any of this process. We manage it from start to final inspection.

If something comes up during permit review — a question about setbacks, a request for additional documentation — we handle it.