Can I Estimate the Cost for Insulation in My House?

Factors

• To make an accurate estimate of the cost of insulation for your house, you'll need several important pieces of information. The first is the size of the area you want to insulate, in terms of square feet. You'll also need to know the type of insulation you plan to use, including the thickness you want, which may involve multiple layers. Finally, you must have a plan for installation, whether it involves performing the process yourself or hiring a professional.

Square Footage

• The square footage of your home, or the portion of your home that you want to insulate, determines how much insulation you need to buy. This figure is not the same as the square footage that represents your home's floor space or living space. Instead, it applies to each of the walls or ceiling surfaces you want insulated. For example, a 10-foot by 10-foot room with walls that are eight feet high requires 320 square feet of insulation for the four walls, minus the space that doors and windows occupy.

Insulation Types

• The type of insulation you choose also has a significant impact on price estimates. Radiant barriers, which are thin, reflective foil strips, are among the least expensive options. Cellulose and fiberglass sheets cost between 40 and 50 cents per square foot if you install them yourselves, according to the State of Hawaii's Department of Business, Economic Development and Tourism. Foam board insulation for the ceiling and spray foam may cost more, depending on the supplier and specific product.

Total Cost Over Time

• The basic formula for estimating a home insulation project is square feet times price per square foot. If you hire a professional to install the insulation, consult the business first to get a quote for installation costs and add it to your materials estimate, or request a full estimate before signing an agreement. Over time, your home's new insulation will reduce your heating and cooling bills, which is also a factor in the total cost of adding insulation. You can compare heating and electric bills from year to year for the same months to estimate the savings and determine how long it will take for the insulation to pay for itself.