Our Mission Is Simple: Comfort, Affordability, Conservation

Call icon

Phone Number:

504-229-6500

How Much Does it Cost to Insulate an Entire House?

Why do you need to insulate a house? When heat travels through the walls of your home, thermal transfer can happen.

On a hot summer day, thermal transfer coming from outside will make your air conditioner use more energy to keep your house cold all throughout.

Thermal insulation work - EcoStar FoamOn a cold day, it is the opposite because thermal transfer happens inside so the heat produced goes out through the walls and windows.

To avoid thermal transfer and make your house feel more comfortable and energy efficient, you need to insulate your house, and the best way to insulate your house is through spray foam.

Insulation can be put anywhere, inside or outside your house, in your ceiling, exterior walls, basement, attic or garage.

If you have the whole house insulation applied with great materials, the thermal transfer avoids happening so you get a comfortable and relaxing home, not to mention low energy bills.

What is the Cost to Insulate a House?

The national average cost to insulate a house is $4,500. The average cost to insulate a house is from $3,000 to $7,000. The most minimum cost is around $2,000 and the maximum amount is $30,000.

The average cost to insulate a home during new construction ranges from $0.65 to $6.50 per square foot. Many types of insulation are suitable for new construction. The most common is to use batt insulation in the walls and ceilings and spray foam or loose-fill in open areas.

Homeowners use different types of rigid insulation board on the exterior before it is sided. It is commonly seen for new construction to use several types, however, to save money you can always choose one type to save money.

Cost to Insulate a House per Square Foot

InsulationMan laying thermal insulation layer - EcoStar Foam is versatile as it can be installed in many areas of a home, including inside walls, on the exterior walls, above the garage, in the attic, in the basement, and adobe the ceilings. There is a considerable large range of costs for insulating a home. For example, there is the option to just insulate the wall cavities of the exterior walls.

Depending on your home’s height, length, and width, the costs could vary significantly. So, while your to insulate a home per square foot can range from $0.65 to $7.50, it is not common that you pay $650 to $7,500 for a 1,000 sq.ft. home.

The starting costs should be closer to $1,650, depending on the insulation type and where it is applied.

The expensive costs could be as much as $15,000 if you try to cover every open space or cavity in your home with spray foam insulation.

House Insulation Cost by Type

There are many types of insulation to know about when installing home insulation. It is vital to determine that not every insulation material can be used in all areas.

Some are designed for specific purposes and areas only, while others can be used in a variety of ways. Some can only be used in open spaces or new construction, while others are used in both.

It is usually common for homeowners or contractors to use a mixture of two or more insulation types when insulating homes. Here are house insulation cost by type:

Spray Foam Insulation Cost

The cost of spray foam insulation is $3.15 to $7.50 a square foot. Spray foam insulation comes in different types. Normally, this is liquid insulation sprayed into cavities and spaces like attic floors or the underside of roof decks.
The spray foam expands upon contact to fill the space. Spray foam is used in existing walls but can cost a lot compared to loose fill.

However, it does the best job of insulating when applied to the correct thicknesses.

Foam Board Insulation Cost

The average cost of foam board or rigid foam board insulation ranges from $2.40 to $3.75 a square foot installed.

Foam board is a material that is usually for the exterior part and designed to be installed beneath the siding. There are some foam boards that can be used for basement flooring or the interior basement walls.

Batt Insulation Cost

Fiberglass batt insulation - EcoStar FoamThe cost of installing batt insulation is $0.65 to $2 a square foot. Batt insulation is the cheapest way to insulate a house. Batts are made of long rolls of material backed with paper or a metallic barrier. Batt insulation is an excellent choice for ceilings, attics, and walls.

However, batt insulation cannot be added to existing walls without completely opening the walls because of this, they are most often installed in new construction, remodels, and open spaces.

Average Cost to Insulate a House by Location

Ceiling Insulation Cost

The cost to insulate a ceiling at home can average between $400 to $1,500, assuming an average ceiling of 500 sq. ft.

However, many insulation companies have minimums of $1,500 to $2,000, so if you have a small ceiling and are using less expensive insulation, you may want to insulate it as part of a bigger project to avoid incurring expensive costs.

Home Attic Insulation Cost

The attic is usually one of the greatest areas for heat loss in the home. The average cost to insulate an attic ranges from $400 to $3,350 which can mean that an attic size of between 500 and 1,000 sq.ft.

If you have a small attic, you may want to insulate it as part of a larger project because most insulation companies have minimums of $1,500 to $2,000.

Cost to Insulate a Garage

Heat insulation and wooden logs - EcoStar FoamThe average cost to insulate a garage can range from $600 to $8,000.

This means that an average 2-car garage may include insulating the ceiling, door, walls, or all available spaces.

You can be charged a minimum of $1,500 to $2,000 by insulation companies, when insulating a portion of a garage or a small garage, you may want to include it as part of a larger insulation project to save costs.

Basement Insulation Cost

A basement that is about 500 sq.ft. to 1,000 sq.ft. can be insulated for the cost of $800 to $8,000.

However, many insulation companies will charge between $1,500 to $2,000. Great insulation choices for the interior walls for basement insulation are batts, loose-fill, and foam board.

More from Star Spray Foam

Things to Know Before Insulating an Attic
Here are 4 Signs to Know If Spray Foam Is Bad


Star Spray Foam insulation is proud to provide affordable, efficient insulation services to the community of New Orleans. We have built a reputation in the NOLA area for efficient, high-quality insulation at an affordable cost.

We use quality materials to maximize the amount of heat retained inside your home – and we install them for you hassle-free. Contact us now!


Important: This site makes use of cookies which may contain tracking information about visitors. By continuing to browse this site you agree to our use of cookies.