In West Babylon more homes heat with oil than with gas: 47.0% of occupied homes burn fuel oil, 39.4% use utility gas, 9.5% electricity and 3.2% bottled gas. The houses behind those tanks are old. The median home dates from 1961, 85.1% of the 14,456 homes were built before 1980, 8.0% predate 1940 and 7.6% come from the 1940s. Then came the boom: 31.3% in the 1950s and 26.6% in the 1960s.
West Babylon is a hamlet in the Town of Babylon, running from Wyandanch and Deer Park in the north down to the Great South Bay. 76.8% of its homes are detached houses, 6.3% are in two-unit buildings and 75.6% of occupied homes are owner-occupied. For many of those owners the insulation question and the oil bill are the same question.
The houses we insulate in West Babylon
The 1950s left 4,522 homes, the largest share of the hamlet, and the growth showed quickly. Robert Moses took part in laying the cornerstone of Santapogue Elementary School in the fall of 1951, and it opened in September 1952 to relieve an overcrowded Main School. The houses of that decade are capes and ranches. The cape’s upstairs was often finished years after the house was built, with short knee walls holding a loose batt, floor bays running open under the knee wall to the eave, and slopes with no vent space. The ranch has a low attic of settled loose-fill and a flue chase that runs straight up through it.
The 1960s added 3,849 homes, and the 1970s another 11.7%: high ranches and splits with a garage under a bedroom, a lower level half in the ground, and a rim joist exposed in the family room. The weak points there are the garage ceiling, the rim, any cantilevered overhang and the long attic plane above.
The older part of West Babylon is more varied. 1,152 homes predate 1940, and in those we assume balloon framing, where the wall cavities run from the basement to the attic without a break, and knob-and-tube wiring until we have seen otherwise. Old wiring comes out before insulation goes into a wall. A two-unit building here may be an older house divided into two apartments or a house with a second unit added below or beside. Either way it has two thermostats, one attic and often one stair, and we scope it as one building.
Along the water the hamlet reaches the Great South Bay, and the peninsula of Venetian Shores in the southwest corner sits inside West Babylon even though it is served by the Lindenhurst post office and school district and is usually thought of as part of Lindenhurst. Where a house near the bay sits over a crawl space or has a lower level that has taken water, the treatment changes: we seal and insulate the floor above, keep materials off surfaces that get wet, and do not put closed cell foam on a wall that floods.
West Babylon also holds 179 mobile homes, whose insulation sits in a belly under the floor and a thin roof cavity and needs a different plan, and 564 units in buildings of fifty or more, whose envelopes belong to their owners.
Oil outnumbers gas: what that means for a West Babylon job
West Babylon’s electric company is PSEG Long Island, and National Grid gas reaches many streets but not all of them. On a street without a gas main, an oil house stays an oil house, or goes to a heat pump. Either way the order of work matters. A new boiler, furnace or heat pump is sized to the heat the house loses on a cold night, and a house that has been sealed and insulated first loses less, so it can take smaller equipment that runs more evenly.
Oil heat puts two assemblies on the scope. The chimney usually rises through the house and the attic, and the gap between the masonry and the framing around it is usually open. That gap has to be closed with metal and a fire-rated sealant, never stuffed with insulation. And when an oil boiler is replaced by a heat pump or a sealed-combustion gas unit that vents out the side wall, the old chimney often stays behind as an unused open flue; it needs to be capped and sealed.
The savings arrive differently too. A sealed, insulated oil house burns fewer gallons, so the payback shows up as fewer deliveries and moves with the price of oil from year to year. We do not promise a dollar payback; we show you where the house loses heat.
We seal before we insulate
Insulation slows heat conducting through a ceiling or wall. It does not stop air, and warm air leaking out of a house carries the heat with it no matter how deep the insulation is. An oil house pays for that air by the gallon.
In a West Babylon cape the sequence is: seal around the chimney with metal and fire-rated sealant; block the floor bays under the knee walls at the eave line; put an air barrier on the back of each knee wall; seal the top plates, plumbing vent and fixture boxes; baffle the slopes; then insulate the knee walls, slopes and the flat above. In a pre-war house with balloon framing, the tops and bottoms of the wall cavities get blocked before anything is filled. Then the rim joist in the basement.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in West Babylon
Most of our projects run between $3,500 and $12,500. In a 1950s ranch with one open attic the job is toward the lower end. A cape with a finished upstairs costs more, because each knee wall, slope and dormer cheek is its own piece of work. A pre-war house with balloon-framed walls adds dense-packing and blocking, and a two-family is priced as one building because the attic, the stair and the basement are shared. For the foam side of the number, see what spray foam costs.
Open cell foam runs R-3.9 to R-4.2 per inch. Closed cell runs R-6.9 to R-7.1 per inch and also acts as a vapor retarder, which is why it costs more and why it is right in some assemblies and unnecessary in others. All products are manufactured in the United States and meet applicable building code and safety standards. ENERGY STAR says sealing air leaks and adding insulation can save up to 10% on annual energy bills.
Insulation rebates in West Babylon
West Babylon’s electric company is PSEG Long Island, and its gas company is National Grid, whose lines reach many streets but not every one. Because the electric company is PSEG Long Island, NYSERDA’s Comfort Home program is not open to West Babylon homes.
PSEG Long Island lists a $2,500 insulation rebate and a $1,000 air-sealing rebate for market-rate single-family homes, with higher amounts for income-qualified homes and homes in state-designated disadvantaged communities. The rebates are paid through PSEG Long Island’s participating contractors after a free Whole House Energy Assessment, which includes a check of insulation and drafts, a thermal scan and a blower door test. Oil heat does not rule a house out: single-family homes heated with oil, natural gas, propane or electricity are all eligible, as long as the insulation goes in with blower-door-assisted air sealing.
National Grid’s Long Island insulation rebate program is not taking new applications, and income-eligible households now use EmPower+. For a Suffolk household under the limit, NYSERDA’s EmPower+ program can pay for air sealing and insulation at no cost up to $14,000 for lower-income households (at or below $98,925 for four people), or half the cost up to $7,000 for moderate-income households (below $131,900 for four), through an EmPower+ contractor; renters can apply, and federal HEAR funds can add up to $1,600 for air sealing, insulation and ventilation. Long Island households should check eligibility on the MyEnergy portal.
For the rest of the cost, NYSERDA’s Green Jobs–Green New York program offers unsecured loans of $1,500 to $25,000 over 5, 10 or 15 years, on the utility bill or as a regular monthly loan, after a no-cost energy assessment. PSEG Long Island customers may be eligible but must apply directly through PSEG Long Island, and loans must be paid back. The federal insulation tax credit (Section 25C) ended for work placed in service after 31 December 2025, so there is no federal credit on a 2026 job, and New York has no state tax credit for insulation. Every program here pays through its own participating contractors. See our New York and New Jersey rebate guide for the details.
Code and climate in West Babylon
85.1% of West Babylon’s homes were built before 1980. New York’s first statewide energy code did not take effect until 1 January 1979, and the capes, ranches and pre-war houses that make up most of the hamlet were built long before it. Suffolk County is Climate Zone 4.
The 2025 Energy Conservation Construction Code of New York State took effect on 31 December 2025. For a new house it sets R-49 for the ceiling, or R-38 over the whole ceiling where uncompressed R-38 runs at full height over the wall top plate at the eaves; R-30 for floors; R-15 continuous, R-19, or R-13 plus R-5 continuous for basement and crawl space walls; U-0.27 for windows; and 3.0 air changes per hour at 50 pascals as the most a new house may leak.
A 1950s cape is not required to meet that table. Unaltered parts of an existing house do not have to comply, and New York’s code does not require a blower door test when you insulate an existing home. Where an alteration exposes roof or wall cavities, though, they must be insulated to full depth, so an opened knee wall or slope gets filled completely. ENERGY STAR recommends R-60 for an uninsulated attic in this zone and R-49 where there are already 3 to 4 inches.
Common questions about insulation in West Babylon
Do you install insulation in West Babylon, NY?
Yes. Most of our West Babylon work is the 1950s cape and ranch, 31.3% of the hamlet, and the 1960s high ranch, 26.6%, plus the 8.0% of homes built before 1940 and the two-family houses. We also work in Venetian Shores and the other streets near the bay, where crawl spaces and lower levels need their own approach. We do not insulate large apartment buildings, whose envelopes belong to their owners.
How much does insulation cost in West Babylon?
Most projects run $3,500 to $12,500. A ranch with one open attic is toward the lower end. A cape with a finished upstairs costs more because the knee walls, slopes and dormers are separate pieces of work. Pre-war balloon-framed walls add blocking and dense-packing, and a two-family is priced as one building. Sealing around an oil chimney, and capping one that is no longer used, is part of the scope where it applies. The price comes in writing after a free walk-through.
Are there insulation rebates in West Babylon?
Yes, through PSEG Long Island, which lists a $2,500 insulation rebate and a $1,000 air-sealing rebate for market-rate single-family homes, more for income-qualified homes, paid through its participating contractors after a free Whole House Energy Assessment. Oil-heated houses are eligible. Comfort Home is not available to PSEG Long Island homes. Income-eligible owners and renters can apply to EmPower+, and Green Jobs–Green New York offers loans. The federal 25C credit has ended, and New York has no state credit.
We heat with oil. Should we insulate before we convert to gas or a heat pump?
Yes, if you can. Heating equipment is sized to the heat a house loses, so sealing and insulating first lets a contractor size the new system to the house you will actually have, which usually means smaller equipment. First find out whether a National Grid gas main runs on your street, because in West Babylon not every street has one. When the oil boiler goes, the old chimney may be left as an open flue through the attic, and it should be capped and sealed.
Free energy audit in West Babylon
In a West Babylon house we look at the chimney where it passes through the attic, the attic floor and eaves, and in a cape the knee walls, slopes and the floor bays under them. Then the basement: the oil tank and boiler location, the rim joist, and in an older house the bottoms of the wall cavities. Near the bay we check any crawl space and the floor above it. If the attic is fine and the loss is the chimney chase and the rim, we say so. Then a written scope and a price, with no charge and no obligation.
Call 914-825-6824 or use our contact form. Open 8am–8pm, seven days. We work out of New Rochelle, NY with a 100-plus in-house crew that never subcontracts.
Learn more
- Insulation contractors across Suffolk County
- Insulation in Lindenhurst
- Insulation in North Babylon
- Insulation in Deer Park
- Insulation for older and balloon-framed homes
- Crawl space insulation near the water
- Recommended R-values for New York