Independent and unbiased Free, no account needed Your data stays private 2026 pricing data

Systems

How Much Does It Cost to Insulate a House?

Q: How Much Does It Cost to Insulate a House?

Insulating a house costs about $3,000 to $15,000 in 2026, depending on the area and type. Blown-in attic insulation is the cheapest and highest-return job, while whole-home spray foam is the most expensive. Insulation often pays back through lower heating and cooling bills.

Cost by insulation type

Installed cost varies by material:

Blown-in (cellulose or fiberglass): $1 to $2.50 per sq ft
Fiberglass batts: $1 to $2 per sq ft
Spray foam: $3 to $7 per sq ft (highest R-value)

Best value first

Attic insulation is usually the cheapest, fastest, and highest-return insulation project, since most heat is lost through the roof. Sealing air leaks first makes any insulation work better.

Hiring or DIYing? One better bid can pay for the kit

The Home Project Bid & Budget Kit

Pricing a project like this? The Scope & Estimate Worksheet sheet turns this site's calculator range into a written line-item scope that every contractor has to bid against.

12 fill-in worksheets, 34 print pages
2 filled-in examples (a hypothetical roof job, three bids)
Excel / Google Sheets tracker: bids, takeoff, payments, change orders, budget
Contract and payment checks drawn from FTC home improvement guidance

Replaces three bids you cannot compare because each one prices a different job, the deposit you were about to hand over without a payment schedule, and the change orders nobody wrote down.

Get the kit $27

30-day money-back guarantee. Use it all; if it doesn't help, every dollar back.

Look inside all 12 worksheets

Instant PDF download · Apple Pay / Google Pay · Researched, not professional advice

Estimate it yourself

HVAC Replacement Cost

Tackling this project yourself?

Amazon picks · Sponsored

A contractor quote is mostly labor. If that estimate felt steep, here is the exact gear to tackle this job yourself. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

Generac Generac 14kW Whole Home Standby Generator with Transfer Switch

Budget: $5,000+

Generac 14kW standby generator sold with a transfer switch

Check price

VEVOR VEVOR Manual Transfer

Budget: Under $250

Prewired 50A manual transfer switch for safe backup power

Check price

Porch Shield Porch Shield Waterproof Universal Generator Cover 38 x

Budget: Under $50

Waterproof cover protects a standby or portable unit

Check price

Westinghouse Westinghouse 12500 Watt Dual Fuel Home Backup Portable

Budget: Under $1,000

Westinghouse dual-fuel portable as a budget backup option

Check price

Frequently asked questions

Does insulation pay for itself?

Often yes. Attic and air-sealing work commonly pays back in a few years through lower energy bills, and many utilities offer rebates. Spray foam costs more upfront and pays back more slowly but seals best.

How Much Does It Cost to Insulate a House?

Cost by insulation type

Best value first

Estimate it yourself

Tackling this project yourself?

Frequently asked questions

Keep reading