Wall Insulation Cost

How Much Does Wall Insulation Cost?

House insulation is a vital part of energy efficiency, and it can also improve your home’s comfort level considerably. Insulating your home keeps harsher weather conditions from affecting the temperature inside. It can also keep the temperature inside your home more stable during the day and night. The primary benefit of wall insulation is that it significantly cuts down on heating and cooling costs. But how much does wall insulation cost? This guide gives you all the information you need to know about expert wall insulation services, including costs and steps to take to get the insulation installed.

Top Types of Wall Insulation and Their Approximate Costs:

Open Cell Spray Foam Insulation

Open-cell spray foam insulation costs about $0.40 to $0.60 per board foot and is one of the most affordable options for installing or adding insulation. It’s also among the most effective, offering an R-value of 3.5 to 3.6 per inch of thickness. Open-cell foam is softer than closed-cell foam and is less expensive, but it doesn’t have as long a lifespan. It’s also not quite as effective at insulating or soundproofing your home, but for the price, the open-cell foam may be the best choice if you want to save money on your insulation project.

Closed–Cell Spray Foam

Closed-cell spray foam insulation costs between $1 and $2 per board foot and is one of the more expensive options for installing or adding insulation. It also has a higher R-value of between 6 and 6.5 per inch, making it one of the most effective insulators. Closed-cell foam is two pounds per cubic foot denser than open-cell foam, so it lasts longer, provides better soundproofing and has a higher R-value. However, because it’s denser, it’s also more expensive than some other alternatives.

Rigid Board Insulation

Rigid board insulation is a high-performance product that provides superior energy efficiency and protection against water damage. It’s best suited for new construction projects or installing exterior siding. This type of wall insulation ranges from $1.70 to $2.4 per square foot, depending on the thickness needed.

Batt or Blanket Insulation

Batt or blanket insulation is a soft, flexible roll made from fiberglass or mineral wool and available in various lengths. It’s commonly used in walls with standard framing but may not work well for studs spaced too far apart for a standard batt width. The batt insulation cost ranges from $0.30 to $1 per square foot based on the R-value needed.

Fiberglass Insulation

Fiberglass insulation is the most common type of blown-in wall insulation. It is made of glass fibers and resin and can be installed in attics, crawl spaces and between walls. It only needs to be blown in once and will not compress or settle over time. This insulation type is available in R-values ranging from 3.7 to 4.3 per inch, which means it costs around $1 to $1.15 per square foot to install with professional installation services. The average cost for installing fiberglass insulation in the walls of a 1,500 square foot home ranges from $1,350 to $1,650.

Factors Affecting the Cost of Wall Insulation

Size Of The Walls

This is perhaps the most obvious factor affecting cost. Larger walls require more materials, which means paying more for them. It also means paying more to have them installed. You can calculate the area of the wall you want to insulate using a basic formula: length times height equals area. Keep in mind that this formula is just an estimate, as it doesn’t consider any windows or doors that may be present on your walls.


The location of your home plays a significant role in determining how much you will pay for wall insulation. Some regions experience extreme temperatures each year, thus requiring better and thicker insulation than others. Consequently, you will pay more if you live in an area where extreme temperatures are expected. On top of that, some locations have high labor rates, contributing to the overall cost.

Depth Cavity

 The deeper cavity walls are, the more expensive it will be to insulate them. Most homes have cavities between 4 and 6 inches. However, some older homes have shallower cavities only 2 inches deep. Insulating these shallow cavities costs less because it uses less material.

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Location of The Wall 

If you are insulating your external walls, this will be more expensive as you will need to remove cladding, existing insulation or plasterboard. You will then have to replace all materials removed at additional cost. However, if you are internally insulating walls, this should be cheaper as there should be no need to remove or replace anything.

The cost of how much does wall insulation cost varies widely based on the size of your house and other factors. Still, it is possible to get insulation for almost nothing if you work with an affordable company.