Finished accessory apartment on a Long Island property

Alec's Construction builds and legalizes accessory dwelling units in Coram, Suffolk County — basement and lower-level apartments, garage conversions, dormered second floors and additions — working out of the yard in East Patchogue. Most of what people call an ADU here is an apartment inside the house they already own, and a lot of those already exist and need to be made legal. That is winter work.

Accessory Apartments in Coram

Coram's 1970s splits and hi-ranches were built with a lower level at grade and a separate door on most of them, which is why a large share of Coram houses already have an informal apartment downstairs. Legalizing one under the Town of Brookhaven's accessory apartment permit is mostly interior work — egress, separation, detection, the kitchen and bath inspected — and the winter is the right time to schedule it because none of it depends on the weather.

The Split-Level Lower Level Is Already Half an Apartment

A split or a hi-ranch was built with a lower level at grade, its own exterior door, full-height ceilings and daylight — which is why so many of them already function as informal apartments. Legalizing one is mostly a matter of what the code asks a dwelling unit to have and the builder never bothered with: a compliant egress opening in the sleeping room, interconnected smoke and carbon-monoxide detection between the units, a fire separation at the shared floor and stair, and the kitchen and bath plumbing and electrical inspected.

The corrections are usually smaller than owners fear. The part that takes the time is the paperwork — the accessory apartment permit, the owner-occupancy affidavit, the inspections — and that is precisely why the winter is the right season for it.

What the Town Asks a Dwelling Unit to Have

  • A compliant egress opening in every sleeping room — net clear opening, sill height and well where it is below grade
  • Ceiling height that meets the habitable-space minimum, measured under the beams and ducts, not between them
  • A fire separation between the apartment and the main house at the shared floor, wall and stair
  • Smoke and carbon-monoxide detection in both units, interconnected
  • A kitchen and a full bath, with the plumbing and electrical inspected
  • Its own exit to the outside
  • The owner living in the house, and the accessory apartment permit with its renewal cycle
Framed and insulated Long Island basement wall going up in winter

Permits in Coram

Coram files with the Town of Brookhaven. The accessory apartment permit sits on top of the building permit — two processes, one address — and the rules differ by town and by village. We confirm which authority governs from the tax map, then read the current rules for that authority, then walk the house against them. It saves months.

The Winter Plan

The interior legalizations run straight through the winter, because none of the work depends on the weather. For a new build — a dormer, an addition, a detached unit — the winter is when the survey, the drawings and the permit application get done so the framing can start as soon as the ground allows.

Free walkthrough in Coram. Alex walks the space against the code, lists what passes and what does not, and you get the list and the photographs whether or not you hire us.

Frequently Asked Questions

My Coram lower level has been an apartment for years. What does legalizing it involve?

A walkthrough first, against the Town of Brookhaven's dwelling-unit requirements: egress from the sleeping room, ceiling height, interconnected smoke and CO detection, a fire separation from the main house, and the plumbing and electrical opened up where they cannot be verified. Then the corrections, then the inspections, then the accessory apartment permit with the owner-occupancy affidavit. The corrections are usually smaller than people fear on a hi-ranch, because the lower level was built to be lived in.

Why do the design and permit in winter?

Because the permit is the slow part. Between the survey, the drawings, the town's accessory apartment application and the plan review, several months can go by before anything is built. Starting that in November means a build can start when the ground thaws instead of in July. The interior legalizations run straight through the winter regardless.

Do I have to live in the house to have an accessory apartment?

In every Suffolk town we work in, yes — the accessory apartment permits are written around owner-occupied houses, and the owner signs an affidavit to that effect. The permits also typically renew on a cycle rather than lasting forever. The specific rules differ by town and by village, and we confirm them for the actual address rather than generalise.

What does an ADU need that a finished basement does not?

A compliant egress opening in every sleeping room, a fire separation between the unit and the main house, interconnected smoke and CO detection in both units, a kitchen and a bath that pass inspection, ceiling height that meets the code for habitable space, and its own means of exit. A finished basement family room is held to a lower standard on most of those. The gap is what a legalization closes.

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Work With Alec's Construction

This guide is written by the crew that does the work. See Alec's ADUs service — accessory apartments, garage conversions and grant paperwork. Licensed and insured on Long Island, one crew start to finish, free walkthrough and a written estimate inside 48 hours.

Booking the cold months now: we also handle Additions & New Construction and Bathroom Remodeling.

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