How Much Does Blown-In Insulation Cost? [2026 Data]

In 2026, the national average blown-in insulation cost is $1,660, based on 16,919 verified projects from Angi Pros. Most homeowners pay between $987 and $2,334, with the range driven primarily by insulation material (fiberglass versus cellulose), the size of the installation area, and the R-value required for your climate zone. You should also budget for air sealing at $300 to $1,500, plus any additional costs for mold remediation, asbestos removal, or pest control if needed.

Blown-In Insulation Cost Factors: What Determines the Price?

Several factors determine what you'll pay to install blown-in insulation throughout your home. The size of the area, the type of insulation material, and your climate zone all play a role in the final price. Understanding each factor helps you plan a realistic budget before you contact a pro.

Size of the Area

The size of the area being insulated is the single biggest cost factor, with blown-in insulation running $1.75 to $7.50 per square foot, depending on the material you choose. A larger area requires more material and more labor, which drives the total price up. To estimate your cost, multiply your square footage by the per-square-foot rate for your chosen insulation type. 

The table below shows how blown-in insulation costs scale across common project sizes:

Type of Installation

Whether you're insulating a new home, which averages $2 to $4 per square foot, or an existing one, which averages $1.75 to $3.50 per square foot, significantly affects the price of blown-in insulation. Newly constructed homes typically use blown-in insulation only in the attic, with batt or spray foam insulation reserved for interior walls, while older homes can receive blown-in insulation in both attics and exterior walls. 

Here is how these insulation costs break down:

• Existing walls: Replacing insulation in an older house costs $1.75 to $3.50 per square foot.

• New homes: Insulating attic walls in a newly constructed home with blown-in insulation costs $2 to $4 per square foot.

• Attic: Insulating an attic using blown-in insulation costs $3 to $7.50 per square foot.

R-Value

The R-value of the new insulation impacts your costs, with options ranging from $230 to $2,000. R-value measures how effectively an insulation material resists heat transfer, and it is the key metric for comparing your options. 

There are two figures to understand: the overall R-value for your space and the per-inch R-value of the material itself. For example, achieving a total R-value of 30 requires 10 inches of a material rated at 3.0 per inch. Materials with higher per-inch R-values, like sheep's wool, cost more up front but require less total material to reach your target.

Below is a breakdown of R-values and the corresponding prices for blown-in insulation:

Additionally, more is not always better. Maxing out your R-value is great for colder climates but likely unnecessary in more temperate regions. Different regions require different R-values, so talk to your insulation pro about your options.

Type of Insulation

The type of insulation you choose is one of the most direct drivers of material cost for a blown-in insulation project, with materials ranging from $0.50 to $2.30 per square foot before installation. Fiberglass sits at the lower end of that range, while denser options like natural wool and dense-pack cellulose cost more per square foot. 

The table below breaks down each blown-in insulation material type by R-value and average cost per square foot:

Home Location

Where you live directly affects how much you'll spend on blown-in insulation, because colder climates require a higher R-value and more material to meet it. A home in Florida, for example, may only require spending $500 to $1,600 on attic insulation costs, while a home in Alaska could run $1,600 to $2,000 or more. Check the Department of Energy for your region's R-value requirements before finalizing your material choice.

Blown-In Insulation Additional Costs: What to Budget For

Your total blown-in insulation budget may extend beyond materials and labor if your home needs prep work before installation can begin, such as mold remediation that costs $10 to $25 per square foot. Related tasks like air sealing or asbestos removal are common additions that can meaningfully affect the final cost. 

Here are some common additional costs to consider:

• Air sealing: A pro often recommends air sealing to avoid drafts and minimize your utility bills. This extra task costs $300 to $1,500.

• Wiring: Electricians charge $50 to $100 per hour, but the overall wiring cost depends on the size of the area and the status of the current wiring. 

• Mold remediation: Mold remediation costs $10 to $25 per square foot.

• Asbestos removal: Asbestos remediation costs $1,200 to $3,300. You should hire an asbestos abatement company near you to handle this task.

• Removing existing insulation: Insulation removal costs range from $1.50 to $3 per square foot.

• Pest removal: Pest control costs $50 to $500 or about $175 on average.

Why You Should Hire a Blown-In Insulation Pro

Installing blown-in insulation requires specialized equipment, so DIYing this project might not save you much due to rental and material costs. Hire a local insulation pro who has the equipment and know-how to install blown-in insulation and ensure the job is done right.

Here’s why it’s ideal to hire a blown-in insulation pro

Blown-in insulation installation can be a complicated process—here’s why you should hire a pro who installs insulation:

• A pro already has all the equipment on hand for installation and plenty of practice using it.

• Professional insulation installers can spot and avoid hazards like mold, asbestos, and faulty wiring.

• An insulation installation pro can ensure blown-in insulation is installed correctly around wall studs, HVAC ducts, and wiring.

• Pros can minimize the mess and dust created during the installation process.

• A pro can safely remove old, contaminated insulation for a fresh installation of new material.

If you want to DIY blown-in insulation

If you decide to tackle some of this project on your own, here are some things you can do:

• Purchase the material from a local store 

• Pre-clean the area so it’s easily accessible during installation

• Remove insulation that’s been contaminated by pests or mold—be sure to wear proper protective gear

• Remove and replace drywall if necessary to access the insulation area

Tips to Save Money When Installing Blown-In Insulation

Follow these helpful tips to potentially lower the project cost of installing blown-in insulation.

• Opt for less expensive insulation: Fiberglass is the least expensive option, costing nearly half the cost of other materials. The R-value is not as robust as other insulation types, but the difference is negligible for many homeowners. Remember, depending on where you live and any pre-existing insulation, you don't necessarily need the highest possible R-value.

• Don't remove pre-existing insulation : Most insulation is stackable, meaning you can add on to existing insulation to increase your home's R-value. Blow the insulation on top of pre-existing materials to save money, but ensure the original insulation is still in decent shape and is not filled with mold, asbestos, or insects.

• Get multiple estimates: Contact a few insulation experts and gather estimates. That way, you can guarantee that you're getting the best value for your service.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We’ve surveyed over 10,000 real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.