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What is the Cost of Installing Insulation?

Most homeowners spend between $1,003 to $1,397 nationally.
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Whether you need to supplement the existing insulation in your home or considering replacing old material with a more modern product, your costs will vary based on the material and method of insulation used. While many homeowners install their own insulation, it can be helpful to work with a professional who can carefully calculate the needs of the spaces in question. This is especially important if your insulation is subject to local building codes.

National Install Insulation Costs

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Median Cost


Minimum Cost


Maximum Cost
Average Range:


National Average Cost $1,325
Minimum Cost $100
Maximum Cost $3,000
Average Range $1,003 to $1,397
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How do we get this data? This info is based on 9364 cost profiles, as reported by ImproveNet members.

Supplementing or Replacing

Your costs will be more extensive if you are removing old material. In older homes, materials may degrade due to a lack of standards at the time of installation. Cellulose, for example, increased dramatically in popularity during the late 1970s as homeowners took steps to improve household energy costs in the face of the oil embargo. This led to the development of standards for issues like fire resistance and R-values. If your material predates this era, you may want to completely extract old insulation to ensure that your home is safely protected and enhanced for energy efficiency. Similarly, any material that has been exposed to moisture or may be contaminated by mold should be removed for health reasons. The discovery of moisture or mold may indicate your need for structural repairs of possible leaks as well.

Is Professional Assistance Necessary?

Installation of too much batt or foam insulation in your attic could lead to problems with household ventilation. Basement and crawl space insulation efforts could be complicated as well. While blown-in insulation may be easier to install than batt materials, it's important to consider any need to access these areas in the future. Minor supplemental jobs are easier than extensive renovations, requiring limited amounts of material and time. Rental of equipment to spray foam insulation could cause your costs to increase, especially if you aren't familiar with the equipment.

While the decision to hire a contractor will add labor costs to your project, you may save on time and materials in the process. Additionally, more precise calculations of how much material is needed will produce better energy usage results in your home, leading to lower energy costs. Your contractor can provide critical barriers needed to prevent over-insulating spaces meant for ventilation. Additionally, your insulation professional will leave space around fixtures that could create fire dangers. The more complicated your project, the more important it is to work with a knowledgeable professional who can enhance both your home's comfort levels and safety with proper installation services.

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