Every insulation company says the same four things: free estimate, licensed and insured, quality materials, family owned. None of that separates them. What does is the paper handed over before work starts, and whether it says what will be done to your house, area by area, in numbers you can check when the crew leaves.
A federal rule makes that easier than most homeowners realize. Under the Federal Trade Commission’s R-value Rule, an installer of home insulation has to give the customer a dated, signed contract or receipt showing the coverage area, the thickness and the R-value of what was installed — each area listed separately, never combined, with loose-fill adding the initial installed thickness, the minimum settled thickness and the number of bags used (16 CFR 460.17). A company that cannot describe its own job in those terms up front will not document it at the end either.
The useful comparison is not three prices. It is three scopes of work.
What a real insulation scope of work looks like
A quote should be a description of work, not a number under a logo. Ten lines, and any competent company can produce all ten.
- The areas, named and measured. “Attic floor, 1,240 square feet,” not “attic.” A knee wall, the sloped ceiling behind it, the hatch, the garage ceiling and the rim joist are five assemblies, each with its own line and square footage.
- The material, by name. Blown cellulose, blown fiberglass, fiberglass batts, mineral wool batts, open cell foam, closed cell foam, rigid board — with manufacturer and product where the product matters.
- The depth or the R-value, area by area. Both is better, because the two have to agree: open cell runs R-3.9 to R-4.2 per inch, closed cell R-6.9 to R-7.1, fiberglass batts about R-3.1 to R-4.3, mineral wool about R-4, cellulose about R-3.2 to R-3.8. “R-49 of blown cellulose, about 14 inches” is checkable; “blow the attic” is not.
- Air sealing, in or out, and where. The leaks in a typical attic are top plates, wire and pipe penetrations, the chimney chase, the bath fan, recessed lights, the dropped soffit over kitchen cabinets and the hatch. The scope should name what gets sealed and with what. ENERGY STAR’s estimate of average savings — 15% on heating and cooling costs, 11% on total energy costs — is for air sealing and insulating, not for insulation alone.
- Fire protection over any foam. The residential code requires foam plastic to be separated from the inside of the house by a thermal barrier, ordinarily 1/2-inch gypsum board, and allows an ignition barrier instead in attics and crawl spaces entered only for repairs or maintenance (Sections R316.4, R316.5.3 and R316.5.4 of the 2021 IRC Connecticut uses, renumbered R303.4, R303.5.3 and R303.5.4 in the 2024 edition New Jersey and New York adopted). A quote that foams a roof deck and says nothing about drywall, a tested coating or an ignition barrier is a change order waiting.
- Removal and disposal. Whether old material comes out, from where, how it is contained and who hauls it. Removal is priced on its own and should never hide inside an installation number.
- Prep, protection and patching. Floor and stair protection, where the hose runs, which access holes get cut and what happens to them. Dense-pack and injection foam mean holes in siding or plaster: the scope should say who plugs them and whether patching is finish-grade or contractor-grade.
- What must not get buried. Soffit vents and baffles, recessed lights not rated for contact, bath fans, knob-and-tube wiring, flue clearances, the hatch, and any decking you still want to stand on.
- How the work gets verified. Markers, a signed certification, photographs of anything that will be covered forever.
- Exclusions, warranty, schedule and payment terms. The exclusions list is the most honest part of a good quote. Electrical corrections, rot repair, roof leaks, duct replacement and painting are somebody else’s line.
Verification is not a favor. The energy code requires the installer to sign, date and post a certification on the job site listing type, manufacturer and R-value — and, for blown fiberglass and cellulose, the initial and settled thickness, the settled R-value, the installed density, the coverage area and the number of bags; for sprayed polyurethane foam, the installed thickness and its R-value. That is Section R303.1.1, and it reads the same in the 2024 IECC New Jersey adopted and the 2021 IECC Connecticut uses. Attics filled with blown-in or sprayed fiberglass or cellulose also get depth markers under R303.1.1.1 of those same editions: at least one for every 300 square feet, numbers an inch tall, facing the access opening. That is how you check depth a year later with a flashlight and nothing else.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
The questions that separate a real crew from a broker
Do you subcontract, and who will be in my house?
Plenty of companies that sell insulation do not install it. They sell the job, mark it up and hand it to whoever is free that week, which is why the crew that arrives often bears no relation to what was promised. Ask whether the installers are employees on the company’s own payroll and workers’ compensation policy, and who runs the crew. Ours are in-house; we do not subcontract.
What will you test, before and after?
A blower door measures a home’s airtightness and locates air leakage paths, as ENERGY STAR’s glossary puts it; the Department of Energy’s Building America program describes the same test as determining how much air is leaking through cracks and holes in a home’s walls, ceilings and floors. Run first it finds the leaks; run afterward it says whether the sealing worked. A thermal camera in a house held under pressure shows where insulation is missing, thin or bypassed.
Which jobs actually need the instruments: whole-house air sealing, where the after number is the only proof the money did anything; any house with a natural-draft furnace, boiler or water heater, because tightening a house changes how those appliances vent, which is why PSE&G’s utility program has its contractors run combustion-related tests alongside the blower door and infrared scan; and any job where a program or a warranty claim will later ask for a measured result. For an attic-only top-up over dry, thin fiberglass, a tape measure and a thermal camera answer the question, and a company that tells you a blower door is not worth your money on that job is being straight rather than evasive. What should worry you is a company that owns no instruments at all and still quotes a savings percentage. See what an energy audit is.
How will you prove the depth I paid for?
Ask before signing, not after. Photograph the certification where it is posted, walk the attic yourself and read a marker, and take your own pictures of every cavity before it closes. Insulation goes invisible the moment it is finished, which is exactly why short-filling it is how a low bid gets made to work. A company that treats the request as unusual has told you it does not do it routinely.
What is the warranty, and who honors it?
In writing, and read it. Material warranties come from the manufacturer and cover the product, not the installation. A workmanship warranty is the contractor’s promise about their labor. Ask how long, what voids it, whether it transfers when you sell, and whether a subcontractor’s work is covered. For a floor to judge the answers against, Suffolk County’s home improvement fact sheet tells homeowners the labor warranty “should be a year or more” — a year is the bottom of the range, not the standard. Ask us the same questions you ask everybody else, and get the answer written into the scope before you sign, because the value of any of it rests on the company still being there: a ten-year workmanship warranty from a company that subcontracts every job is a warranty on a phone number.
Can I see the insurance certificate and the license?
Two documents. The certificate should show commercial general liability and workers’ compensation with current dates, sent by the insurance agent rather than pulled from a van. Workers’ compensation matters most: an uninsured installer hurt in your attic becomes your problem. The registration or license number belongs on the paperwork, and in three of the places we work that is law rather than courtesy: New Jersey requires the registration number in advertisements and on all business documents, Connecticut requires it in any advertisement (Section 20-427 of the General Statutes) and inside the contract itself (Section 20-429), and Westchester County requires it on advertisements, contracts, invoices, proposals and stationery.
Licensing and insurance in New Jersey, Connecticut and New York
Insulation is home improvement work, so these rules cover it. Verify a company’s standing with the agency, not with the company.
- New Jersey. Home improvement contractors register with the Division of Consumer Affairs. Registration requires commercial general liability insurance of at least $500,000 per occurrence and workers’ compensation unless exempt, and since P.L. 2023 c.237 it also requires what the Division calls an additional security — a compliance bond, irrevocable letter of credit or other security — of $10,000, $25,000 or $50,000, the tier set by the size of the contract or of the previous twelve months’ work. The registration number must appear at the place of business, in advertisements, on business cards, on commercial vehicles and on business documents, and a written contract is required for any job over $500. The same law created the Home Improvement and Home Elevation Contractor Licensing Act and a state board of home improvement and home elevation contractors, which moves New Jersey from registration toward licensing as the board stands up, so ask which one a company holds and when it expires.
- Connecticut. Contractors and salespeople register with the Department of Consumer Protection and pay into the Home Improvement Guaranty Fund. Understand the fund before you rely on it, because it is not a claims desk: you need a court judgment or an arbitration award against a registered contractor first, and on a Superior or Federal Court judgment you must have tried to collect through a marshal’s writ of execution and failed. Then the fund can pay the actual damages, court costs and attorney’s fees ordered in that judgment, up to $25,000, on residential work priced above $200, with the application filed within two years of the judgment. Contracts must be written, dated, signed by both parties, identify the contractor and carry the registration number, give start and completion dates and include notice of the owner’s cancellation rights.
- New York. No statewide home improvement license; it is handled county by county. Westchester County requires a license from its Department of Consumer Protection, with the number on all advertisements, contracts, invoices and proposals; contracts and change orders must be written and signed, carry start and completion dates and the cancellation notice, and the contract must state that the contractor is legally required to put all progress payments received before completion into an escrow account or post a bond to protect them. Working unlicensed there is a Class A misdemeanor. Suffolk County’s own fact sheet names the places that license home improvement contractors as New York City, Suffolk, Nassau, Westchester, Putnam and Rockland, so ask for the license issued by your county rather than a neighboring one.
Each of these agencies confirms a registration and its complaint history without you leaving the kitchen table: New Jersey’s Division of Consumer Affairs runs a license verification search, Connecticut’s Department of Consumer Protection publishes its eLicense lookup, and the county consumer protection offices in Westchester, Nassau, Suffolk, Putnam and Rockland will confirm a license and any complaint history by phone. Two minutes, before the deposit check.
Red flags
- A price with no scope. One number, no areas, no material, no depth: nothing to compare and nothing to enforce.
- Pressure to sign today. A discount that expires when the salesperson reaches the driveway is a tactic, not a price. Connecticut requires every home improvement contract to carry notice of the owner’s cancellation rights, and the consumer notice that Westchester and Suffolk both print gives the customer an unconditional right to cancel until midnight of the third business day after the contract was signed. Suffolk’s fact sheet is careful about the federal version of that right: it applies to a contract signed in your home, and not to one signed at the contractor’s place of business, one of $25 or less, or emergency repairs. Either way, no honest price needs a signature tonight.
- “We’ll handle your rebate.” Programs run through their own approved lists. A company that waves the question off, or names a rebate amount without naming the program and the utility, has not checked or is not on it.
- Tearing out insulation that does not need to come out. Removal has real reasons: wet, rodent-soiled, fire-damaged, or in the way of sealing. Dry, clean fiberglass that is merely thin usually wants sealing and more depth on top. “It all has to come out,” said before anyone has been in the attic, is a revenue decision. Vermiculite runs the other way: the EPA’s advice is to leave it undisturbed, so a contractor eager to vacuum it out is itself the flag.
- One material for every problem. A company that foams everything is selling its equipment rather than solving your house. Closed cell foam at a rim joist is the right tool; the same foam across an open, dry attic floor is money in the wrong assembly.
- Cash, or a large deposit. Westchester County’s own advice is to avoid contractors who demand cash or more than a third of the total before work begins, or whose address is a P.O. box and a cell phone. Suffolk County is stricter still, calling a fair down payment one under 15% with the rest tied to completed phases.
- A savings promise with no arithmetic. A percentage is not a forecast for your house. Any number larger than the published average should arrive with the model behind it: which areas, what R-value, what fuel price, and what the air leakage measured before and after.
- No license number on the paperwork. Where it is legally required, its absence is the answer.
How to compare two quotes that look nothing alike
The usual frustration is not that one quote is higher. It is that one says “R-49 blown cellulose over the attic floor with air sealing” and the other says “spray foam the roof deck,” thousands apart. Those are not two prices for one job but two different houses afterward: the first leaves the attic outside the thermal envelope, the second brings it inside, changing ventilation, the ductwork up there and what the space can be used for. Normalize first.
- Line the areas up. Write out every area either quote touches and check off which quote covers it. Most of the gap lives in an area one company included and the other skipped.
- Convert everything to R-value. Inches of different materials are not comparable; R-values are.
- Price the gaps, not the totals. Wherever one quote carries an area, a day of air sealing, a removal or the drywall over foam and the other does not, ask the cheaper company what that missing line costs. The difference either closes or it does not, and that answer is the comparison.
- Ask each company to price the other’s approach. Attic floor against roof deck is the usual split, and this is the step that turns two incomparable pieces of paper into a decision. A company unwilling to quote the alternative is telling you it sells one thing.
- Then compare warranty, verification and terms. Same R-value over the same areas, but one company posts the certification, photographs every cavity and ties payments to completed phases: that is worth money.
Three quotes is sound advice, but three quotes for three strategies produces confusion rather than bargaining power. Settle the diagnosis first — what is wrong, and which surfaces need to become the boundary. See recommended R-values for New York and New Jersey.
The mistakes that cost the most
Insulating before air sealing
Insulation slows heat flow and does nothing about air moving through a hole. A house can be full of fiberglass and still drafty because conditioned air leaves through top plates, chases and the hatch. Sealing afterward is harder and usually partial. See air sealing.
The wrong material in the wrong place
Fiberglass against a damp foundation wall, batts stuffed into a cavity they cannot fill, closed cell foam where an inch of sealing and a foot of cellulose would have done the same for less. Material choice is a location decision. See types of insulation.
Burying what should have come out
New insulation blown over wet, moldy or rodent-soiled material seals the problem in and makes the next job worse. Vermiculite is its own case: the EPA’s guidance is to leave it undisturbed, and testing and removal belong to a licensed abatement contractor.
Compression, gaps and buried equipment
A batt squeezed into a cavity loses R-value; one that leaves a gap at the edge loses more than the gap’s share, because air moves around it. In attics the common damage is blown material packed into the soffit vents and loose-fill heaped over recessed lights never rated for it.
Buying a product before diagnosing the problem
A cold room over a garage, ice dams, a second floor that cooks in August and a basement that smells in July are four different failures, and the right first dollar differs for each. ENERGY STAR’s own problem list does the first sorting: it files ice dams on the roof in winter, drafty rooms and uneven temperatures between rooms under the attic, and cold floors and pests under the basement or crawl space.
Past that, the four point in different directions. A cold room over a garage is usually the garage ceiling, where batts sag out of the joist bays and nothing seals the floor from the outdoor air beneath it. Ice dams are heat and air escaping the house into the attic, melting snow that refreezes over the cold eave, so the work is sealing the leaks and keeping the attic cold rather than adding heat to the roof. A second floor that cooks in August is attic heat, made worse when the ductwork runs through that attic. A basement that smells in July is warm humid air meeting cool surfaces, a moisture and ventilation question that has to be settled before insulation goes near it — and if there is standing water or grade falling toward the house, that is a waterproofing contractor’s job first. Tightening a house also changes how it breathes, so natural-draft furnaces and water heaters, unlined chimneys and bath fans venting into the attic deserve attention on the same visit. A real contractor looks at the mechanical room on the way up, and says plainly when something belongs to an HVAC contractor instead. See garage insulation and basement insulation.
Rebates run through their own contractor lists
These programs require the work to be done by a contractor on their own approved list, strictly rather than as a preference.
- Connecticut. Energize CT states that installations using the Home Energy Solutions insulation rebate must be performed by an approved contractor from the Energize CT Insulation Installers Network.
- New York. NYSERDA’s Comfort Home packages are delivered by NYSERDA-approved participating contractors, and NYSERDA publishes the list by area.
- New Jersey. Search the old name and you will not find the program. The utility-run whole-house program that homeowners knew as Home Performance with ENERGY STAR is now presented as Whole Home Energy Solutions, and the utilities’ old program pages redirect to it. It still runs through the gas and electric utilities and still requires a participating contractor: PSE&G states that all of its participating contractors are Building Performance Institute (BPI) certified.
So ask any company, including this one, in these words: are you on the participating contractor list for my program and my utility today, and will you file the paperwork? “We work with all the rebate programs” is not an answer. A company not on a list should say so and let you weigh the rebate against the installer. Details by state: New York and New Jersey insulation rebates and Connecticut insulation rebates. Federally there is nothing to wait for — the 25C credit ended for property placed in service after 31 December 2025.
What install day looks like
Clear a path before the crew arrives: the hatch or pull-down stairs, the basement or crawl space entry, and a parking spot near the house, because the hose has to reach. Boxes stored under the hatch will be moved by somebody, and it should be you. Plan for pets to be elsewhere, and expect noise.
A removal day starts with containment: plastic on the path, material vacuumed through a hose into a sealed bag on the truck rather than carried down your stairs. An air sealing day is slow, quiet and produces almost no visible change, which is normal. A blown insulation day ends with the markers set and the certification posted.
Spray foam is the day with real rules. The EPA’s Safer Choice guidance on spray polyurethane foam — now held on the agency’s archive and no longer updated, though it remains the plainest federal statement on the question — is that occupants and other workers should vacate during application, and that re-entry stays restricted until the product has finished curing and the building has been adequately ventilated and thoroughly cleaned. Some manufacturers recommend 24 hours after application for the two-component high-pressure professional system before workers re-enter without protective equipment and before residents re-occupy, and the EPA says to weigh vulnerable occupants such as children, especially children with asthma. A proper crew wears full-face supplied-air respirators, because isocyanates give no warning by smell, and OSHA requires a respiratory protection program wherever workers must wear respirators. See is spray foam safe.
Walk the job with the crew lead before anyone drives off. Read the certification, check the receipt against the contract, and ask what was found that nobody expected — soaked sheathing, knob-and-tube, a bath fan venting into the attic. A good crew tells you at the door instead of covering it up.
What we do, and what we hand to somebody else
We do every part of the insulation work itself: open and closed cell spray foam, blown-in cellulose and fiberglass, fiberglass and mineral wool batts, rigid foam board, air sealing, insulation removal and replacement, crawl space vapor barrier and encapsulation, injection foam and dense-pack in closed walls, soundproofing insulation, radiant barriers, rodent-soiled attic cleanup, and commercial and new construction. One company, one certificate of insurance, one warranty.
What we do not do, and will not pretend to: asbestos or vermiculite abatement, a licensed trade of its own; mold remediation; waterproofing; HVAC or duct replacement; roofing; electrical. Those go to the right specialist, and on a house that needs them that work comes first — insulating over an active water problem buys a second problem. In an apartment building, condominium or co-op the first question is not technical: the attic, roof deck and exterior walls usually belong to the association or the owner, so we start by finding out who decides.
What insulation costs
Most of our projects run between $3,500 and $12,500, moving on square footage, material, target R-value, access, removal and how much air sealing the house needs. A firm price quoted over the phone, before anyone has seen the attic, is a guess dressed as a number, and guesses get corrected upward once the crew is on site. For foam, see spray foam insulation cost.
Common questions about choosing an insulation contractor
How do I choose an insulation contractor?
Judge the scope of work, not the sales call. A real quote names each area and its square footage, the material, the depth and R-value, whether air sealing is included and where, what comes out and who disposes of it, the fire protection over any foam, the patching, the exclusions and the warranty. Then verify the license or registration with the state or county, ask for a certificate of insurance showing general liability and workers’ compensation, and ask whether the installers are employees or subcontractors.
What should be included in an insulation quote?
Area by area: square footage, material by name, depth and R-value, air sealing, removal and disposal, the thermal or ignition barrier over foam, prep and patching, what must not be buried, how the work will be verified, exclusions, warranty, schedule and payment terms. The FTC’s R-value Rule requires the finished job to be documented with a signed, dated receipt showing coverage area, thickness and R-value per area, so a company that cannot write that in advance is a risk.
Do insulation contractors need a license in New Jersey, Connecticut and New York?
New Jersey requires home improvement contractors to register with the Division of Consumer Affairs, carry at least $500,000 per occurrence in commercial general liability coverage and workers’ compensation unless exempt, and, since P.L. 2023 c.237, hold an additional security of $10,000, $25,000 or $50,000 by contract size; the registration number goes on advertising and business documents, and a written contract is required for jobs over $500. Connecticut requires registration with the Department of Consumer Protection, participation in the Home Improvement Guaranty Fund, and the registration number in the contract and in any advertisement. New York has no statewide license: Suffolk County’s fact sheet names New York City, Suffolk, Nassau, Westchester, Putnam and Rockland as the places that license home improvement contractors, so check your own county.
How do I compare two insulation quotes that recommend different things?
List every area either quote touches and see which one skipped something — that is usually where the price difference lives. Convert inches to R-value so the materials are comparable. Locate the air sealing, the removal and the patching in each. If one proposes insulating the attic floor and the other the roof deck, those are two different houses when finished, so ask each company to price the other’s approach.
Should I get three insulation quotes?
Yes, but settle the diagnosis first. Three quotes for three different strategies produces confusion rather than bargaining power. Have each company walk the attic, the basement or crawl space and the problem rooms, then ask them all to price the same scope so the numbers are comparable. Any company unwilling to look at the house before quoting has told you what its estimate is worth.
Do you subcontract insulation work?
No. Our installers are our own employees on our own payroll and workers’ compensation policy, which is the answer worth insisting on from any company you call. Ask who will be on site, who runs the crew and who to reach during the job. A warranty from a company that subcontracts every job depends on a subcontractor still being in business when you need it.
How do I know the contractor installed the depth I paid for?
Three checks, all already required. The energy code makes the installer sign, date and post a certification on the job site listing type, manufacturer, R-value and, for blown material, installed and settled thickness, density, coverage area and bag count. Where the attic is filled with blown-in or sprayed fiberglass or cellulose, it also gets depth markers, at least one per 300 square feet, facing the hatch. The FTC requires a signed receipt with coverage area, thickness and R-value. Add your own photographs of every cavity before it is closed.
Do I have to use a contractor from the rebate program’s list?
Usually yes. Energize CT requires installations using the Home Energy Solutions insulation rebate to be performed by an approved contractor from the Energize CT Insulation Installers Network; NYSERDA’s Comfort Home packages are delivered by NYSERDA-approved participating contractors; and New Jersey’s utility whole-house program, now presented as Whole Home Energy Solutions rather than under the old Home Performance with ENERGY STAR name, runs through participating contractors that PSE&G says are Building Performance Institute certified. Ask any company whether it is on the list for your program and your utility today, and whether it files the paperwork.
What are the red flags of a bad insulation contractor?
A price with no scope. Pressure to sign before the salesperson leaves. A promised rebate with no program or utility named. “It all has to come out” before anyone has been in the attic. The same material proposed for every part of the house. A demand for cash or more than a third down. A savings percentage with no model behind it. And no license or registration number on the paperwork: New Jersey requires it on advertisements and business documents, Connecticut inside the contract and in any advertisement, and Westchester on advertisements, contracts, invoices and proposals.
How much does insulation cost?
Most of our projects run between $3,500 and $12,500, and where a house lands depends on square footage, material, target R-value, access, removal and how much air sealing is needed. Nobody can give an accurate number without seeing the attic, the basement or crawl space and the problem rooms. Our assessment costs nothing, but the price is not the point of it: it ends in a written scope — areas, square footage, material, depth and R-value, what gets sealed, what comes out, what is excluded — that you can hand to another company and compare line for line.
Hiring an insulation contractor in New Jersey, Connecticut, the Hudson Valley and Long Island
We go into the attic, the basement or crawl space and the uncomfortable rooms before writing anything down. Then you get a scope: the areas and their square footage, the material, the depth and R-value, what gets sealed, what comes out, what is excluded, and what our part costs. Take it to any other company and compare line for line. That is what it is for.
Call 914-554-2289 or use the contact form, 8am–8pm, seven days. The Home Insulators is family-owned, based in New Rochelle, NY since 2015, with a 100-plus-person in-house crew. We work across all of New Jersey, all of Connecticut, New York’s Hudson Valley including Westchester and Rockland, and Long Island; see our service area.