Dormers, Additions & Custom Homes on Long Island.

Dormers Long Island projects run into three specific constraints you won't hit in most other markets. First, Nassau County contains 95+ incorporated villages, each with their own building department and some with Historic District overlays — a shed dormer in Garden City goes through the village ARB, while the same dormer in Hicksville goes straight to the Town of Oyster Bay. Second, Long Island's post-war housing stock is dominated by 1950s–1960s Cape Cods and ranch houses, where the structural jump from a half-story attic to a full primary suite requires both a permit engineer review and a lateral load calculation most general contractors don't know to order. Third, salt air exposure along the south shore and north shore requires vapor barriers, stainless fasteners, and window flashing details that inland builders routinely skip. LI Homeworks handles all of it — our in-house AIA architect our in-house architect has managed dormers Long Island projects across all 13 townships and dozens of villages, and our permit coordinator handles every filing so you never touch a form.

Yes. We're licensed in both Nassau County and Suffolk County and hold town-level licenses in Hempstead, Huntington, Smithtown, and Babylon. Our permit coordinator runs our permit desk — she handles filings end to end and you don't touch a form. Permits are itemized in the estimate, not a surprise line.

A full shed dormer is framed and watertight in a single day — we plan the job around weather, strip the roof in the morning, and tarp or sheath by dinner. From permit-to-paint we're typically 6–9 weeks depending on interior scope. Plans and permits run another 4–8 weeks on the front end.

A typical 4,000–6,000 sq ft custom home runs 12–16 months from foundation pour to certificate of occupancy. Design + permitting is another 4–8 months on the front end. Tear-down rebuilds add 2–3 weeks for demo, asbestos survey, and site clearing. We walk you through a full Gantt chart before you sign.

Both. Our in-house architect has been in-house since 2012 and draws most of our dormer and addition work. For luxury new builds, we work regularly with several LI architects — Meyer Davis, Mojo Stumer, Remick Architecture. If you've hired your own, we'll come to the first meeting and review drawings for constructability and cost before a single spec is locked.

Our bread and butter is additions in the $180K to $650K range. Dormers typically $85K–$150K. New home construction $1.6M–$1M across Nassau and Suffolk, with East End work running higher. We don't take jobs under $75K — too small for the vertically-integrated model to make sense.

We carry $1,000,000 general liability, full NY workers comp, builders risk on every active job, and pollution insurance. COIs are filed with every township before we break ground. We can send our insurance binder to your attorney or lender on request.

Dormer additions on Long Island range from $35,000 for a small eyebrow dormer to $150,000 for a full-width shed dormer with luxury primary suite buildout. The most common project — a full shed dormer on a Cape Cod or Colonial converting an unfinished half-story to a primary suite — typically runs $85,000–$130,000 across Nassau and Suffolk counties. Cost drivers: dormer width, structural complexity, interior finish scope, and permit jurisdiction. We provide fixed-price written contracts with no escalation clauses.

We build four primary dormer types across Nassau and Suffolk County: shed dormers (flat-sloped, full-width — the most common and cost-effective for maximum space), gable dormers (peaked roof — traditional appearance, ideal for Tudor and brick colonial homes), hip dormers (three-sided slope — blends with hip-roofed colonials), and eyebrow dormers (curved arch — for estate homes and historic properties). Shed dormers account for roughly 70% of our Long Island dormer work because they deliver the most usable square footage per dollar invested.

A typical Long Island dormer addition takes 6–12 weeks from permit issuance to completion. Add 4–8 weeks for design and permitting on the front end. Total timeline from first consultation to final walkthrough: 3–5 months for a standard shed dormer, 4–6 months for projects requiring historic district review or structural remediation. Construction day one: we strip the roof, frame the dormer, and have it sheathed and watertight before dark — eliminating weather exposure to your home's interior.

Yes — every structural dormer addition on Long Island requires a building permit from the applicable township or village building department. Nassau County contains the Town of Hempstead, Town of North Hempstead, Town of Oyster Bay, and dozens of incorporated villages each with their own permitting process. Suffolk County contains the Towns of Huntington, Smithtown, Babylon, Brookhaven, and others. Our permit coordinator identifies the correct jurisdiction for your address and manages all filings — you never touch a form. Permit fees on Long Island typically run $1,200–$4,000.

Yes — dormers in Garden City are among our most specialized projects. Garden City is an incorporated village with its own Building Department at Village Hall (100 Marcus Avenue, 11530), and roughly a third of the village falls within the Historic District, requiring Architectural Review Board approval before a permit is issued. Our in-house AIA architect our in-house architect handles every Garden City ARB application — elevation drawings, material samples, board presentation — and we have had every submission approved. Shed dormers on Garden City's center-hall colonials typically run $90,000–$145,000 and typically convert the half-story to 800–1,000 sq ft of primary suite space. Gable dormers on Tudor revivals typically run $75,000–$110,000. See our dedicated dormers Garden City NY page for more detail.