How much does it cost to insulate or reinsulate an attic?

• <div>On average, insulating an attic costs about $2,500, with a typical range of $1,500 to $3,500. The final price often depends on the attic's size, with costs generally falling between $1 to $3 per square foot. For example, insulating a 1,800-square-foot attic would likely cost between $1,800 and $5,400.If the project involves removing old insulation, this can add an average of $900 to the total cost, bringing a full removal and reinsulation project to around $3,000.Several factors influence the overall cost:<ul><li>Insulation Type: Prices per square foot vary significantly by material.</li><li>Reflective: $0.50–$1.50</li><li>Blown-in: $1–$4</li><li>Batt: $2–$4</li><li>Loose-fill: $2–$5</li><li>Spray foam: $2–$5</li><li>Structural insulated panels (SIPs): $4–$7</li><li>Project Complexity: Factors like sealing air leaks, poor attic accessibility, and required inspections can add to the cost.</li><li>Removal Issues: The discovery of mold, asbestos, or pests during the removal of old insulation can substantially increase the price.</li></ul></div>

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Last update on April 20, 2026

Reviewed in April 2026
The team at McBriens was beyond amazing. I needed a new flue installed as well as repointing, repair to the crown and a cap to the chimney. Omar was prompt with coming to give an estimate, beat out other companies price point and got me scheduled for repairs within 4 days. Julio and Diego worked...
McBriens Fire & Flue
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Reviewed in September 2024
The siding installation project took two weeks, and the technicians were punctual, friendly, and they cleaned up the area afterward, leaving the place spotless. I would definitely recommend this company to anyone in need!
Ideal Siding Westchester
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Reviewed in February 2024
Break Ground has done work for me for several years: everything from installing a fireplace, reworking my driveway, landscaping, plowing and anything else I have asked. Always reliable and theis crews are prompt, professional and very respectful. Very happy to have found them.
Break Ground LLC
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Reviewed in February 2021
Always on time. All repairs and installs new equipment on ti.me. Work is Always clean
Pool Works Service Co., Inc.
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Reviewed in January 2020
For $1300 I d expect a better install. After I looked at it all when it was finished. The guy never caulked the pipe out of the house, he told me about all the animals that he s taken out of the pipe that get in from up top but didn t put a screen on it? Also I found that he ran electrical and I...
SWAT Environmental, Inc.
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Reviewed in October 2019
Rob called promptly. Schedule a repair time convenient to my schedule less than a week's wait. Rob couldn't make the original scheduled time due to an emergency but called promptly and rescheduled for the next day. Did the necessary repairs. Was missing a part so came back following day and...
Woodville Plumbing and Heating
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Reviewed in August 2019
I had an extremely challenging water treatment situation. I have a dug well in close proximity to a year round flowing river - this causes regular water quality fluctuation. Within five minutes of sending a request for contact, I received a call - offering to help. (First Star - to this day I...
Maine's Best Water Treatment
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Reviewed in July 2019
Lightning protection is a fairly exotic trade in the private home market, with only a tiny fraction of all homes having them so the number of lightning installers is very small, and the cost probably much higher than one might think. WB Lightning Rods however significantly undercut the one...
W B Lightning Rods
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Reviewed in June 2016
Our poor undersized HVAC system lasted 22 years, the last 2 stumbling along. Living in southernmost TX, a/c is pretty much a necessity. When our system finally died, our house reached 94 degrees and we pretty much needed to bite the bullet and replace the whole system. I went on HA, and though...
Norman's Air Conditioning
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Reviewed in May 2016
Charged over $500. To install one fixture that I supplied totaling 3 connections and did not bring the tool to fix a drain problem that was part of my request.
Total Climate Control
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Doorbell Installation questions, answered by experts

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

For standard 2x4 walls, the ideal insulation has an R-value between R-13 and R-15. This level of insulation, typically around 3.5 inches thick, fits well within the wall cavity. Common options include fiberglass batts and spray foam. The best choice for your home can depend on your climate; use R-value maps, like those from Energy Star, to determine the recommended level for your region. For colder climates, you might also consider adding exterior insulation for greater efficiency. Always check with your local building codes to ensure you meet any required standards.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

On average, insulating an attic costs about $2,500, with a typical range of $1,500 to $3,500. The final price often depends on the attic's size, with costs generally falling between $1 to $3 per square foot. For example, insulating a 1,800-square-foot attic would likely cost between $1,800 and $5,400.

If the project involves removing old insulation, this can add an average of $900 to the total cost, bringing a full removal and reinsulation project to around $3,000.

Several factors influence the overall cost:

Insulation Type: Prices per square foot vary significantly by material.
Reflective: $0.50–$1.50
Blown-in: $1–$4
Batt: $2–$4
Loose-fill: $2–$5
Spray foam: $2–$5
Structural insulated panels (SIPs): $4–$7
Project Complexity: Factors like sealing air leaks, poor attic accessibility, and required inspections can add to the cost.
Removal Issues: The discovery of mold, asbestos, or pests during the removal of old insulation can substantially increase the price.

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.

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