How much does it cost to insulate a 1 000 sq ft attic?

Author: Mr. Tyler Romaguera  |  Last update: Monday, January 26, 2026

The national average cost to insulate an attic is $2,000 to $3,250. Most homeowners pay around $2,500 to fully insulate a 1,000 sq. ft. attic with a mixture of fiberglass batts and blown-in cellulose.

What is the most affordable way to insulate an attic?

3. Fiberglass Batt and Roll Insulation. Fiberglass batt and roll insulation is a common and budget-friendly option. This insulation comes in pre-cut batts or long rolls, making it easy to fit between the framing members, like joists and trusses, in your attic.

Is adding insulation to an attic worth it?

Should you insulate your attic roof? Insulation is a wise choice to increase the energy efficiency of your home. Quality insulation will make it more cost-effective to heat and cool your home, The Department of Energy's estimates range from a 10% to 50% savings, depending on several factors.

How much does it cost to spray foam for 1500 square feet?

The cost to insulate an attic is usually between $1.50 and $3.50 per square foot. This price can change depending on the attic's size and how easy it is to get to. For a typical 1,500-square-foot attic, you pay $2,250 to $5,250.

How often should attic insulation be replaced?

However, due to its construction with natural materials, eventually the product will lose effectiveness. Fiberglass insulation typically needs to be replaced 15-20 years into it's life, as it can easily become dirty, wet, moldy, and ineffective if there's a roof leak or water damage of any kind.

How much does it cost to insulate a 1800 sq ft attic?

How much does it cost to insulate a 40x60 shop?

Final Cost of Insulating a 40'x60' Steel Building

After you factor in the costs of materials and the costs of construction, you'll find that it will run you between about $2,400 and $6,600 to insulate your 40'x60' metal building.

What type of attic insulation is best?

Fiberglass batt is considered to be the best insulation for attics. Compared to other insulation materials, it is the cheapest and easiest to install. Fiberglass batt is also incredibly energy efficient, as it helps to slow the spread of hot and cold air.

What is the 7 and 7 rule for attics?

This rule means, at least half of your attic space must be 7 feet high by 7 feet wide, with a total of 70 square feet. Keep in mind, codes vary from place to place, but for using the attic as an actual room, this rule typically applies.

Do I need a permit to finish my attic?

Reach out to your local municipality to see if you need a permit for your attic remodel. A permit is usually only needed if: You are adding electrical wiring or ventilation. You plan to change the structure of your home in the process, such as knocking down an existing wall or adding a dormer.

Is finishing an attic worth it?

For most projects, finishing an attic adds 50% to 60% in increased value.

Which is better, attic insulation blown or rolled?

Blown fiberglass insulation scores an R-value of 3.2 to 3.8, making it slightly less likely than rolled fiberglass to prevent the flow of heat into and out of your house. That being said, though, blown fiberglass insulation isn't meant to cover huge areas like rolled fiberglass insulation.

What is the labor cost to install insulation?

Most installers charge between $40 and $80 per hour to install insulation, so the more complex the project, the more it will cost. A few complexities that may increase the cost of labor include: Your installer needs to install insulation in hard-to-reach areas.

Should I remove old attic insulation before adding new?

Do I Have To Remove Old Insulation? Unless your insulation is wet, moldy or infested with pests, you don't need to remove it before adding insulation on top of it. ENERGY STAR® recommends that you inspect your insulation for signs of mold, mildew, moisture and pest infiltration before making this determination.

How much does a 40x60 slab cost?

How much does a 40x60 concrete slab cost? An installed 40x60 concrete slab (4 inches thick) for buildings will typically cost between $9,600 and $19,200. A 4-inch slab will usually cost between $4 and $8 per square foot (depending on your location) for materials and labor.

What is the most cost effective way to insulate?

Overall, fibreglass insulation is the cheapest and most effective insulation option available, making it a popular choice for homeowners and builders alike.

Can I put too much insulation in my attic?

It is possible to over-insulate your house so much that it can't breathe. The whole point of home insulation is to tightly seal your home's interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers.

Does attic insulation increase house value?

Yes, attic insulation effectively limits heat transfer, which helps maintain comfortable indoor temperatures with less strain on the HVAC system. This efficiency can lead to lower energy bills, a key feature that can attract buyers looking for energy-efficient homes and potentially increase resale value.

How many inches of insulation is good in the attic?

The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.

What are the negatives of spray foam?

Spray foam insulation is a good insulator in terms of keeping a room warm or cool. But its many downsides outweigh the benefits. These include, making it more difficult getting a mortgage, potential health issues, environmental damage, ventilation issues and a lower home valuation.

How much does it cost to insulate a $1600 sq ft house?

Cost to insulate a house

Insulation costs $1.00 to $4.50 per square foot installed, depending on the type, material, R-value, and area. The average cost to insulate a house is $1,600 to $8,000. Insulation material prices are $0.50 to $2.80 per square foot, plus $0.50 to $1.70 per square foot for installation labor.

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