Holbrook is a primarily residential suburban hamlet in the Town of Islip, known for its quiet neighborhoods, highly-rated Sachem school district, and proximity to Long Island MacArthur Airport. The Suffolk County Greenbelt Trail passes through Holbrook, and residents enjoy access to the Holbrook Country Club and numerous smaller parks. Building permits in Holbrook are issued by the Town of Islip Building Department — Holbrook is an unincorporated hamlet with no village-level government.
Holbrook is largely inland and most properties are outside coastal flood zones. However, properties near the Greenbelt wetlands and low-lying areas may require flood zone determinations. The Town of Islip handles all permits — there is no village government.
Holbrook's lot coverage limits — typically 25-30% of total lot area depending on zoning — can constrain addition designs. Properties near the Greenbelt may also require environmental review for tree removal or grading. Milton's will verify your zoning constraints before designing your project.

The Town of Islip Building Department issues permits for construction, alterations, additions, and demolitions within town limits. Holbrook, being an unincorporated hamlet, falls entirely under the Town's jurisdiction with no additional village-level requirements.


Permit applications are submitted to the Village of Babylon Building Department. A complete application typically includes the application form, a current property survey, construction drawings, and any required engineering or architectural plans depending on the scope of work. Visit villageofbabylonny.gov for the current application, required documents list, and fee schedule. The department can be reached directly for questions specific to your project.
Straightforward residential applications are generally processed within a few weeks when submitted complete. Projects that require Planning Board or Zoning Board of Appeals review take longer. For waterfront work, applicants must obtain a NYS DEC tidal wetlands permit before the Town will finalize its approval. Where a project sits near the boundary between village and town jurisdiction, the may have a role as well. Milton's coordinates with all relevant agencies to keep approvals moving in parallel wherever possible.
Milton's has worked in the Incorporated Village of Babylon for decades and has a clear picture of how the Building Department reviews and approves applications. We submit complete, accurate packages and follow up proactively so nothing sits idle in a queue.
On waterfront projects, we coordinate the NYS DEC tidal wetlands application alongside the Village building permit so both approvals move forward together. We handle every inspection required during construction and do not consider a project complete until the Village has issued all final paperwork.

Yes. The Town of Islip requires a current survey (typically within 5 years) showing existing structures, lot lines, and setbacks for any addition or new construction. A site plan showing the proposed work in relation to property lines is also part of the permit submission. Milton's coordinates the surveyor and prepares the site plan as part of your project.
It depends on the proximity of the deck to tidal wetlands. NYS DEC requires a tidal wetlands permit for structures built within the regulated adjacent area, which extends a set distance landward from the wetland boundary. If your lot fronts the bay or a tidal canal, there is a strong likelihood that DEC review will be required. Milton's will assess the site and initiate the DEC application in parallel with the Town permit to save time.
The Town Building Department typically requires inspections at foundation, framing, rough-in of mechanical systems, and final completion. The exact inspection sequence depends on the scope of work. Milton's schedules every required inspection and has someone on site to meet the inspector, so the project stays on track.
Milton's Construction has pulled and managed permits across Suffolk County for four decades. We prepare the plans, file with Town of Islip Building Department, schedule every inspection, and see your project through to the Certificate of Occupancy — so you never have to navigate the process alone.
Get a free, no-obligation estimate for your project today.