Roofers in Smithtown

This page lists roofing companies with a location in the Town of Smithtown, Suffolk County, in Hauppauge, St. James, Nesconset and Smithtown. Suffolk County licenses them. The town's design table for the state residential code marks ice barrier underlayment as required and sets a 130 mph design wind speed. Branch, Nissequogue and Head of the Harbor run their own building departments.

Last reviewed October 31, 2026.

A homeowner in St. James spots ice and water shield on a roofing estimate and squints at it. Real requirement, or upsell?

In the Town of Smithtown, the town itself answers that. The state code leaves the box blank for each town to fill in, and Smithtown wrote yes.

The design table Smithtown wrote for its roofs

New York’s residential code hands part of one table, R301.2(1), to each town to complete with local conditions. Smithtown posts its copy on the Building Department’s construction page. It was written for the 2020 state code and revised in January 2022. We have not seen a version issued for the 2025 code.

Item in the town’s table	Smithtown’s entry
Ice barrier underlayment required	Yes
Design wind speed	130 mph
Wind-borne debris zone	1 mile from the coast
Ground snow load	20 pounds per square foot
Weathering	Severe
Frost line depth	36 inches
Termite damage	Heavy

The ice barrier line is the one that turns up on a roofing quote. The table’s footnote ties that column to a history of local damage from ice damming. Leave it off a Smithtown reroof and the roofer is skipping something the town marked as required. How dams form and how to clear one safely is on the ice dam guide.

The wind line matters most along the Sound, where the debris zone covers houses within 1 mile of the coast. A quote for a house in that band should name the shingle’s wind rating, so you can hold it up against the 130 mph figure. The asphalt shingle page covers how shingle wind ratings are published.

One storm, three Smithtown snow totals

The February 22 to 23, 2026 blizzard dropped its snow unevenly across the town. The National Weather Service’s storm page lists a trained spotter one mile north of Smithtown at 17.1 inches by late morning on the 23rd. A public report one mile west of Nesconset came in at 28.8 inches that afternoon. A CoCoRaHS observer in Nesconset recorded 20.0 inches the next morning.

Totals like those are why the town table carries a snow load line. They also explain how two roofs a couple of hamlets apart can come out of the same storm in different shape. Once it clears, look for gutters pulled away from the fascia and stains on top-floor ceilings. If water is already coming in, start with emergency roof repair. Clearing the gutters before winter costs less, and the gutter cleaning page covers it.

Permits, villages and the license

The town’s building code exempts ordinary repairs that are not structural. Touch the framing and you need a permit. Roofing is missing from the residential permit types on the town’s online portal. The full breakdown, with fees, the permit term and fines, is on the Smithtown roofing permit guide.

Three villages sit inside the town and run their own building departments: the Village of the Branch, Nissequogue and Head of the Harbor. The town will not take an application for a house in any of them. Their phone numbers are in the permit guide.

Solar is the one roof-adjacent job the town clearly permits online, with its own 2026 residential application. Whether to reroof before panels go on is covered on the solar roofing page.

The town’s alterations checklist asks for the contractor’s Suffolk license photo ID, which makes the county lookup the check for any roofer here. Run it with the Suffolk license guide before you sign.

In this directory’s October 2026 snapshot, four companies have a location in the town, in Hauppauge, St. James, Nesconset and Smithtown. Roofing is tagged on all four cards. Chimney work is tagged on two, and that work has its own chimney repair page.