Framed and insulated basement wall going up in a house in Bohemia, New York

Alec's Construction finishes basements and lower levels in Bohemia (11716), working out of the yard in East Patchogue. It is interior work that runs straight through the winter, and it starts with three questions answered honestly — is it dry, is it tall enough, and can someone get out of it in a fire — before anyone talks about finishes.

Basement Finishing in Bohemia

Bohemia's houses are north of Sunrise Highway, on flat sandy ground between the highway and MacArthur Airport with the Connetquot River preserve on the west, and there is no tidal water to worry about. The housing is 1960s and 70s ranches and splits on quarter-acre lots under the pitch pine and oak left standing when the lots were cut. That is a good combination for basement work: the ranches often have full basements, the splits have lower levels a few steps below grade, and the sandy ground carries water away from the walls when the grading lets it. The trouble spots are the usual ones — pine needles packed in the gutters, downspouts emptying at the foundation and a sump with no backup. South of Sunrise the hamlet is mostly the industrial park along Lakeland Avenue and Johnson Avenue, which is not basement territory.

What We Look at First in Bohemia

On a Bohemia split, the lower level is usually the family room already, with paneling, a drop ceiling and a door to the garage. We look at what the ceiling height becomes once the drop ceiling comes out, how the garage wall is fire-separated, and whether the slab sweats in summer. Then rim joist, foam, framing. On a ranch with a full basement the order is water, height, egress, then layout.

Sandy Ground and Lower Levels

Bohemia sits on sandy, well-drained ground for the most part, and that is good news for a basement. Most of the moisture we find in basements here is humidity — warm summer air meeting a cool foundation wall — rather than water coming through it, and humidity has a mechanical fix: a properly sized dehumidifier with a drain, and air sealing at the rim joist.

The common houses are ranches with full or partial basements and hi-ranches and splits whose lower level is already half above grade. On a hi-ranch the lower level is the easiest finish on Long Island — real windows, an exterior door and a slab at grade — and the work is mostly insulation, flooring, ceiling and a bathroom.

Dry is not the same as tested, though. We still want to see the space after a real rain, with the gutters discharging well clear of the foundation, before anything is closed in. Most basement leaks we are called about turn out to be a downspout emptying beside the wall.

Foundation wall being sealed before a Long Island basement is finished

Dry, Measure, Then Frame

The order of a basement finish does not change. First the water: gutters and grading outside, any seepage traced and fixed, and humidity brought under control. Then the measurements: ceiling height below the beams and ducts, egress for any room that could be a bedroom, and where the bathroom plumbing can go.

Then the build. Foundation walls are insulated with rigid foam against the concrete and framed in front of it, so the wall stays warm and dry. The floor gets a system that tolerates a cool slab. Electrical, heat, and the bathroom go in, the permit inspections are passed at each stage, and the finishes go on last.

Permits in Bohemia

Bohemia files with the Town of Islip on Main Street in Islip hamlet. Finishing a basement is permitted work — framing, electrical, plumbing and any egress opening are inspected — and where a house is in the mapped flood zone the floodplain rules can decide whether the space can be finished at all. We file before we frame.

Alex walks the house in Bohemia, photographs what he finds and gives you a written scope in the order the work has to happen — whether or not you hire us. Call (631) 312-7441 to set up a time.

Frequently Asked Questions

Can the lower level of my Bohemia split be redone without losing height?

Usually it can gain some. A lot of 1970s split lower levels have a drop ceiling that costs several inches; taking it out and putting drywall tight to the joists, with the ducts and pipes boxed individually, gives some of that back. The floor is the other place height goes, so we use a thin subfloor over the slab rather than a thick sleeper system. Both choices have to work with how damp the slab gets in summer.

Does a finished basement in Bohemia need an egress window?

Any room that could be used for sleeping needs an emergency escape opening, and many basement layouts need at least one for the space as a whole. On a buried basement that means a window cut into the foundation with a proper well and drainage. On a walkout or a hi-ranch lower level, an existing door or window may already do it.

How do you keep a finished basement in Bohemia from getting musty?

By controlling the moisture before and after. Outside, the gutters and grading send water away from the walls. Inside, the walls get rigid foam against the concrete rather than plastic behind drywall, the rim joist is sealed, and a dehumidifier with a drain keeps the air dry in summer.

Who issues the permit for basement finishing work in Bohemia?

Bohemia files with the Town of Islip on Main Street in Islip hamlet. Finishing a basement is permitted work — framing, electrical, plumbing and any egress opening are inspected — and where a house is in the mapped flood zone the floodplain rules can decide whether the space can be finished at all. We file before we frame.

Related Guides

Work With Alec's Construction

This page is written by the crew that does the work. See Alec's Basement Finishing service — height, water and egress answered before anything is framed. One crew from the first walkthrough to the last inspection.

Also in Bohemia through the cold months: ADUs and Bathroom Remodeling.

Also Serving Bohemia

Talk to Alec's Construction About Basement Finishing in Bohemia

We come out, look at the house, photograph what we find and put a written scope in your hand. No pressure, no obligation. Working across Suffolk County since 2018.

Or call (631) 312-7441

No cost, no obligation. We reply the same day.