Long Island Pricing, 2026

Real Long Island insulation pricing. No fabricated numbers.

Every number on this page is an industry range benchmarked against Remodeling Magazine Cost vs Value, HomeAdvisor True Cost, and Angi LI regional data. We never quote a single fake price to a homeowner who has not had a walk-through.

Get a Real Ballpark (631) 641-5536

Licensed Nassau & Suffolk

HIC #H0109620000 · #44127-H

$2,000,000 Insured

General liability + workers comp

NYSERDA Approved

Factory certified installer

BBB A+ Accredited

Since 2011

4.9★ on Google

214+ reviews

680+ homes done

Nassau & Suffolk · 2013 to now

Five tiers, five budgets

What a Long Island insulate actually costs

Ranges below assume a 2,000 sqft exterior (typical 4-bed Colonial or Hi-Ranch), standard tear-off, house wrap, flashings, permits, and a 10-year workmanship warranty. Jobs with more trim, steep gables, or extra detail land higher.

Premium air barrier, R-7/inch

Spray Foam

$3,500 – $9,500

2,000 sqft install · $3.50 – $7.50 / sqft

80–100 year lifespan
Lifetime on material, 10 years on installation

Interior walls, R-3.8/inch

Open-Cell Foam

$2,800 – $7,500

2,000 sqft install · $1.50 – $3.50 / sqft

80–100 year lifespan
Lifetime on material, 10 years on installation

Retrofit, R-3.7/inch

Cellulose

$2,200 – $5,500

2,000 sqft install · $1.20 – $2.40 / sqft

50–80 year lifespan
Lifetime on material, 10 years on installation

Most Requested

Highest ROI, air seal + R-49 or R-60

Attic Upgrade

$2,500 – $6,500

2,000 sqft install · $2 – $5 / sqft (attic floor)

50–80 year lifespan
Lifetime on material, 10 years on workmanship

Complete thermal envelope retrofit

Whole-Home

$8,500 – $22,000

2,000 sqft install · $4 – $11 / sqft

50–80 year lifespan
Lifetime on material, 10 years on workmanship

What can move the number

Why your neighbor’s quote looked different

Same house on paper can land $8,000 apart depending on what’s under the existing insulation, how many stories, and whether the town is in a historic district. Here are the adjustments we see most.

NYSERDA Comfort Home rebate

Most single-measure projects qualify. We handle the paperwork and discount it off the invoice.

deduct $1,500 – $5,000

Vermiculite removal required

Asbestos-containing vermiculite in older attics must be abated before new insulation. Licensed abatement only.

add $3,500 – $8,000

Knob-and-tube wiring discovered

Must be removed or upgraded before insulating in NY. We coordinate with a licensed electrician.

add $1,800 – $4,500

Bulk water or moisture intrusion

Crawl space standing water, basement leaks, or roof leaks must be fixed first. We refer to waterproofing pros we trust.

add varies

Large scope (3,000+ sqft home)

Larger attics, taller ladders, more material runs. Quoted per-sqft at the audit.

add 10 – 20%

Ready when you are

Want the number for your specific house?

Give us your address. Marco will come by for 30 minutes, take measurements with a laser, and send you a written quote within 48 hours. If you like it, great. If not, no hard feelings.

We handle the rebate paperwork — you just feel the difference.

680+

LI homes since 2011

4.9★

214 Google reviews

4hr

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(631) 641-5536

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