Roofers in Islip

This page lists roofing companies based in the Town of Islip, Suffolk County, including Bay Shore, Sayville, Bohemia, Ronkonkoma, and Holbrook. Suffolk County licenses them. On the town sheet dated June 16, 2025, replacing roof covering needs no permit if the structure does not change. A dormer or new rafters does. Four villages inside the town issue their own permits.

Last reviewed October 31, 2026.

Read the contract twice if it says the town does not want a permit. On the Town of Islip sheet dated June 16, 2025, repairing or replacing a house’s roof covering, siding or facade needs no permit when the structure stays as it is. Changing the roofline is on the other side of that sheet, and the town wants it filed as an alteration. New shingles plus a dormer, written as one job, are two different answers.

Covering is one filing. Structure is another.

The same sheet treats a window or door that fits the hole it replaces, with headers and studs left alone, as work that needs no permit. A new opening, or a swap that disturbs those headers or studs, needs one. If the quote says the plywood is coming off, or rafters are being sistered, the “no permit” line no longer describes the whole job. Ask the Building Division which lines of the quote are which. They are at One Manitton Court, Islip, 631-224-5466. Put the answer in the contract. This site does not yet have a full Islip permit guide, so the sheet itself is the document to keep.

Brightwaters, Islandia, Ocean Beach and Saltaire are the four villages with their own halls. A house in any of them does not use the town sheet. Brightwaters hall is (631) 665-1280. Phones for the other three are on the county’s town-and-village list. Call the village before you call the town.

Suffolk’s home improvement license is still the check, even on a job the town does not permit. County law covers this work, roofing and siding included, and the lookup shows complaints along with status. Follow the Suffolk license guide for the search. Nothing in our notes adds a separate Islip roofing license on top of the county one. If the town requires one we have not found it, so do the county lookup before you sign.

A normal January at the Islip station

The National Weather Service January almanac for Islip, using 1991 to 2020 normals and labeled unofficial, puts the average daytime high at 39.2 degrees and the average overnight low at 24.6. Normal January snow is 10.3 inches. The February almanac, same unofficial label, puts normal snow at 9.4 inches. The month crosses freezing as a matter of course, which is how ice builds at the eaves of a house with a warm attic. The ice dam guide covers removal, and it is also where the state rule is explained: an ice barrier is required only where the local table says so. We do not have Islip’s table. Ask the Building Division rather than assuming the roofer’s usual spec is the town’s.

A blizzard on February 22 and 23, 2026 made those normals look small. A trained spotter in Central Islip reported 31.0 inches, and the official observation at Islip Airport was 29.1 inches. Gutters packed with snow like that pull off the fascia. Cleaning them ahead of the next storm is the cheaper step, on the gutter page and the gutter cleaning page.

Bay Shore and Sayville are the bay. Bohemia, Ronkonkoma and Holbrook are inland in this directory’s town file. Some hamlet names in Suffolk straddle a town line, so confirm the town if the house is near one. This file places all five under Islip. Salt air is the question on a bay block, and the mileage and the sources stay on the lifespan guide. Shingle wind ratings are on the asphalt shingle page. Siding, when the structure is not changing, is on the same no-permit side of the town sheet as roof covering. Materials are on the siding page.

Hours are written more clearly here than in neighboring towns. Islip’s noise code allows construction that would otherwise be a disturbance from 7 a.m. to 8 p.m., and it defines a weekday as Monday through Saturday, skipping legal holidays. Sunday is outside that window. Urgent necessity or public safety is the exception in the code. Brightwaters, Islandia, Ocean Beach and Saltaire can write their own.

The October 2026 cards with an Islip location are in Bay Shore, Sayville, Bohemia, Ronkonkoma and Holbrook. Roofing is marked on each one. Siding is marked on three, chimney work on one.