How Much Does Attic Insulation Cost?

Kenneth Wilson

Are you dealing with a high energy burden, driven mainly through energy costs (electricity, home heating, and cooling)? We're here to tell you it doesn't have to be that way.

There is no need to break the bank if you want to maintain a comfortable temperature for your home. You may want to check your attic for starters, as poor insulation may be the root cause of the expensive heating and cooling costs.

The US Department of Energy claims that a properly insulated attic helps you cut substantial costs up to 10 to 15 percent off your monthly power bills.

Read on as we'll discuss all the costs involved in an attic insulation project– so you can prepare your budget accordingly. 

Attic Insulation Cost Overview


Standard attic insulation will cost somewhere between $1,725 to $4,025, depending on your insulation material of choice. Attics with small square footage may cost $1,000 on average, while more extensive attics may cost up to $4,000 for professional insulation projects. (Related: Everything You Need To Know About Attic Insulation)

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If you're working with a tight budget, you may want to consider blown-in insulation since it's the most cost-effective option. In contrast, structural insulated panels may cost you the most, but it is ideal for maximum energy efficiency. It will significantly reduce your usual energy and heating costs.

A poorly insulated attic will only let warm air get out of the house, inviting cold air to settle in. Don't let another summer or winter season come by without fixing your attic insulation needs. It's best to consult a local insulation professional to assist you in keeping your home's temperature under control.  

Factors Affecting Attic Insulation Costs


Like other home improvement projects, calculating your attic insulation expenses will heavily depend on various factors. Keep in mind that your total project costs may differ from the national average range, depending on the project size, insulation type, local labor rates, and other factors.

Let's discuss the defining variables in detail below so you can prepare your insulation project budget accordingly.

Size


The total insulation costs will depend on your project's square footage. Hence, there will be no one price that fits all in this context. Most attic insulation projects start at $1 to $7 per square foot, averaging $1,725 to $4,025.

Refer to the table below for a quick overview of the standard attic sizes and their average insulation expenses:

Attic Size (Square Feet)

Average Costs

500 sq. ft.

$575 - $4,025

700 sq. ft.

$805 - $5,635

1,000 sq. ft.

$1,150 - $8,050

1,500 sq. ft.

$1,725 - $12,075

Insulation Type


Like any other insulation project, your total attic insulation expenses will depend on the chosen insulation type.  

There are several types of insulation for your attic. If you're wondering about the most cost-effective option, blown-in is the cheapest attic insulation method. Meanwhile, you can expect to pay more for structural insulated panels and spray foam insulation.

Let's discuss the different attic insulation options you can consider. 

Insulation Type

Average Costs (Per Square Foot)

Blown-In Attic Insulation

$0.4 - $2.7

Spray Foam Attic Insulation

$3 - $6

Batt Insulation

 $2 - $4

Structural Insulated Panel

$4 - $8

Loose Fill Attic Insulation

$2 - $5

Reflective Insulation

$0.50 - $1.7

Blown-In Attic Insulation


Standard blown-in insulation will cost you around $1,150 to $2,415. Therefore, this method is considered the most cost-efficient insulation type available. 

What makes it cheaper than the rest? Well, all the necessary materials cost the lowest, and the installation process is done quickly. Your contractor will use a blower (blowing machine) to fill in tiny cellulose, fiberglass, or mineral wool fiber material inside the space.

One benefit of this insulation type includes its flexibility to fit right into tight cracks and spaces. However, the material may also tend to settle over time, and its installation may require you to drill a small hole in the side of your home. It varies on a case-to-case basis, though.

More specifically, there are three primary blown-in insulation methods: fiberglass, cellulose, and rock wool. Again, the determining factor generally boils down to your preference. 

  • Fiberglass: Fiberglass is an inexpensive option costing you only $0.4 per square foot. With all the material costs, typical fiberglass insulation will cost about $201. 
  • Cellulose: Cellulose is an eco-friendly material that makes for a great choice if you want your home to be more green. It is composed of recycled cardboard and newspaper, running for $0.37 per square foot. You may spend $184 on cellulose insulation costs. 
  • Rock Wool: Rock wool is known to have a dense consistency that mimics sheep wool. A rock wool blown-in insulation will be the most expensive of the bunch, at $2.7 per square foot or roughly $1,380. 

Spray Foam Attic Insulation


Spray foam insulation costs $1,495 to $4,370 on average, or roughly $3 to $6 per square foot. It runs a little higher compared to other types.

You can choose from two options: open cell or closed cell spray foam insulation. Open-cell costs less, but it doesn't effectively block moisture compared to the other type. Meanwhile, closed-cell spray foam is denser– giving you a better vapor barrier.

Since spray foam insulation virtually sticks to just about any surface, it will be easy for your contractor to apply it in place. It can get to even the smallest nooks and crannies to give you excellent temperature control. 

Batt Insulation


Batt insulation is made of long fiber rolls, typically held together by either foil backing or paper. It will cost you about $2 to $4 per square foot.

The materials include fiberglass, cellulose, and sometimes– old blue jeans. It is generally sold in rolls before being installed in strips to fit small spaces. 

Although this method is ideal for expansive spaces, it may not efficiently fill tight spaces as you'd like it to be. However, thanks to its low price and easy installation, batt insulation can be a good choice for your attic. 

Structural Insulated Panel


You will spend $4 to $8 per square foot for structural insulated panels. Also known as SIPs, the material is plywood and insulation sandwiches.

If you're wondering about the premium price tag, it is primarily due to its durability and outstanding energy efficiency. Although it doesn't make for a good choice in attics with existing insulation, SIPs can encourage better insulation for attics in newly constructed homes.

The panels are made from layers of rigid foam insulation attached to the plywood or oriented strand board (OSB). It is renowned for its tight building envelopes, as they lack empty cavity walls.  

Loose Fill Attic Insulation


Loose-fill attic insulation will cost you $2 to $5 per square foot. It is similar to blow-in insulation. However, your contractor will only drop the material in the area instead of using a blower to scatter it around.

If you see a loose fill that resembles small gravel, that may suggest an asbestos presence. Exposure to this mineral may cause long-term health risks to your family. In most cases, you may be required to hire a professional asbestos removal company. 

Reflective Insulation


Reflective insulation costs $0.50 to $1.7 per square foot. It refers to a shiny aluminum foil layer which you may add to foam, plastic film, or polyethylene bubbles.

Take note that you will need another insulation type when going with this route. One selling point of reflective insulation is how they block excessive heat from entering the attic while lowering your energy costs (on cooling) in the summer months. 

Material


Similarly, your material of choice may also affect the total attic insulation costs. Each insulation material is used in various ways– but most homeowners only consider their intent based on the area where it is installed.

While some materials are used for a DIY installation, others may call for professional services. The additional labor costs are something you need to remember in setting your budget.

Let's discuss the most common attic insulation materials and average costs (covering standard 1,000 to 1,500 sq ft areas).

Material

Average Costs

Fiberglass

$345 - $1,150

Cellulose

$690 - $4,025

Polystyrene

$1,150 - $10,350

Rockwool

$1,610 - $3,680

Sheep Wool

$1,725 - $4,830

Cork

$3,450 - $11,500

  • Fiberglass Attic Insulation - Fiberglass insulation for your attic will range from $345 to $1,150. One of the most popular insulation materials for domestic lofts is available in blown-in, batts, and loose-fill insulation.  This material is composed of thin fibers in a glass coating. The fibers effectively trap air, making it an excellent insulation feature. Fortunately, fiberglass insulation has some pretty straightforward installation. 
  • Cellulose Attic Insulation - Expect to spend somewhere between $690 and $4,025 for cellulose attic insulation. This material is derived from wood pulp, containing a massive amount of recycled content such as old newspapers.  It undergoes a comprehensive process to develop resistance against flame and insects. You may opt to install it on wall cavities or floor coverings.   Cellulose is available in two types: damp (vertical installation) and dense (flooring and other areas). 
  • Polystyrene Attic Insulation - Polystyrene attic insulation will cost you $1,150 to $10,350. This foam insulation material is available as spray foam or foam board.  Since it has expansion properties, the material may be changed over time– including its insulation abilities.  For your reference, extruded polystyrene is known for its better insulation capability compared to expanded polystyrene. Both are flame retardant, though.   Polystyrene material may cover the roof deck's underside, attic flooring, as well as walls. 
  • Rockwool Attic Insulation - Attic insulation with Rockwool runs for $1,610 to $3,680. Rockwool, also commonly known as mineral wool, is derived from recycled slag or silica fibers.  It is commonly found in batt insulation and loose-fill types. Compared to fiberglass, this material has a higher density and provides better insulation.  Since it contains silica, it needs to be handled by professionals to ensure your safety. Don't worry. It won't leave any danger lurking in your attic after installation. 
  • Sheep Wool Attic Insulation - On average, sheep wool attic insulation costs about $1,725 to $4,830. Natural wool is available in batt form, and it is renowned for its high insulating value.  In addition, it is also biodegradable and completely renewable– making it an excellent choice for eco-friendly homeowners. Finally, the material fills any gaps between joists in your attic floors and walls. 
  • Cork Attic Insulation - Cork insulation for your attic averages $3,450 to $11,500. Note that this material is widely made available in the form of rigid boards.  It has excellent insulating values per inch compared to other alternative materials. Accordingly, this option comes with a higher price tag.  Several homeowners opt to add cork in their attic as an additional insulation layer, particularly in the ceilings and walls. One important note: just ensure your attic space is already finished. 

Labor Costs


You will also need to factor in the local labor costs in your area, especially if you're seeking professional services to get your attic properly insulated. In some areas, you may hire insulation contractors in particular. However, if your locality only has a general contractor, that can be a good alternative. 

The hourly rate will cost you around $80, at $1.7 to $4 per square foot. But, of course, this depends on the insulation material and type you've chosen to go with. Since we're discussing labor rates, you will also need to pay attention to local building regulations. It's best to consult your contractor to ensure your attic insulation project follows code.

Another consideration is your eligibility for certain federal and state rebates or credits. Again, your contractor will discuss and explain what may be available for you to claim. 

Air Sealing


An attic air sealing will cost you around $287 to $862. Note that the process requires the removal of existing insulation to determine possible air leaks. Most contractors will air seal your attic before installing the new insulation material.

Think of air sealing as a great move to properly maintain your insulation in the long run. It aims to close gaps in the exterior walls, and it will effectively avoid drafts and block excessive moisture. 

Faced vs Unfaced Insulation


In choosing the proper attic insulation type for your needs, you will need to select between faced or unfaced insulation. Generally, faced insulations involve foam board and batts, while the unfaced type has spray foam and loose-fill. 

Facing can be metallic foil, kraft paper, or vinyl– as it holds batt insulation and may serve as a vapor barrier. In short, it blocks moisture from transferring all over the place. For exterior walls, you might want to consider faced insulation as it protects against moisture build-up.  

The costs for both faced and unfaced insulation materials may overlap, as these are available in many kinds. Although one kind is not better than the other option, it's best to go with the faced insulation route if you are dealing with moisture problems at home. 

R-Values for Attic Insulation


How do you determine just the right amount of insulation for your attic? It all depends on the insulation type you have selected to go with.

Remember that every type has a different rate on the R-value scale, which measures its ability to block heat and cold penetration.

Most current building codes require R-50 insulation for attics in new homes, while existing properties call for R-38 insulation. The age of your property is not the only factor to consider in this, as you also need to take geographical location into account.  

Ventilation


Yes, you've read that part right. Ventilating the attic is just as crucial as ensuring proper attic insulation. Moisture build-up and condensation are only some of the repercussions of improper attic ventilation. As a result, this may rot the insulation and affect its structural integrity.

Although attic vents aren't required at all times, installing them will only improve the comfort in your home– as well as protect you from related problems down the line.

Standard attics have ventilation in three different areas: gable ends, roof ridge, and soffits. It's ideal to prioritize proper ventilation if you're planning attic insulation soon. 

Attic Insulation Replacement


Replacing your attic insulation costs about $2 to $9 per square foot. It doesn't include the additional labor expenses for old material removal yet, at an extra $1 to $1.7 per square foot.

If your existing insulation is dry and in an excellent visible condition– you may opt to keep it around. Suppose that's the case; you may settle with adding blown-in insulation or spray foam atop the old material.

Attic Cleaning


Is your attic a mess? Well, you may need to clean all the dust and debris out of your attic space first before the insulation project takes place.

Professional attic cleaning services run for $115 to $345 on average, separate from the insulation material expenses. Your contractor will ensure the space is tidy and all cleaned up before the installation process. Accordingly, junk removal will charge you more. 

Other Cost Considerations


Energy Audit


If you are uncertain about the need to insulate your attic, you may do an energy audit to make an informed decision. It will study your home thoroughly– and you can determine the specific areas in the household where you are losing energy the most. Ideally, you'd want to address these locations first.

Most energy audits will cost you somewhere between $166 to $483. 

Mold Remediation


Attics with visible leaks or moisture control problems may need immediate remediation. However, any mold growth in the area will only affect the insulation performance.

It's best to solve the attic mold problem first. Removing all the traces of mold in the attic will cost you $1,725 and $4,025 on average. 

Humidity Repairs


In the warmer months, your attic's humidity levels may go through the roof. Keep in mind that excessive humidity may only encourage mold activity, possibly thriving in the cellulose insulation.

A simple way to deal with this problem is to add a dehumidifier to your attic space. Depending on the unit's size and type, it will cost you somewhere between $120 and $1,150. 

Soundproofing


Insulating your attic can significantly improve the acoustics in the area. For your reference, many insulation materials serve as a great soundproofing agent.

Should you need your attic to be more soundproof, you may opt to install extra acoustic-absorbing material– which will cost you $1,150 to $2,875 on average. 

Attic Insulation Project Process


Let's face it– attic insulation isn't the most exciting home improvement project. But, while it doesn't allow you to bring your creative vision to life, it does improve your home's quality of living.

A properly insulated attic helps keep you cozy and warm during cold winters and cooling you on scorching summer days. Not to mention, it will also allow you to cut costs on your monthly energy bills. A heated attic may only distribute heat to your living spaces in the summer, which pushes your AC unit to work around the clock. 

It's why many homeowners consider attic insulation to be an essential component of just about any house.

So, what goes down in a typical attic insulation project? First, let's take a closer look at the step-by-step process.

Area Preparation


Before the actual installation process, you need to do some prep work to ensure the attic space is ready.

If the area lacks adequate lighting, you may need to plug in a temporary work lamp as a handheld flashlight won't suffice. In such a case where there's no flooring in the area, you may need to lay down thick plywood panels to serve as a safe platform to work and step on.

You will also need to look for visible signs of a roof leak or any discoloration. Prioritize repairs at once before your contractor starts to work on the installation. Insulation products may release toxic particles right into your home. It's why professionals wear full protective clothing and gear while carrying out the attic insulation task. 

Installation


Once the attic space is deemed ready, the actual installation process will begin. Once unpackaged, insulation may expand on short notice. You may want to leave your insulation material wrapped until you use it. 

Several contractors measure the area to be insulated first before cutting the product accordingly. It is to avoid compressing the insulation material– as it may result in significant R-value loss.  

Benefits of Hiring an Attic Cleaning Professional


Once you're sure of your attic insulation project, it's time to search for "attic insulation companies near me" and related queries.  

We get it. It is undeniably tempting to attempt a DIY project if you want to cut costs, but trust us– an insulation professional will help you ensure the process is done correctly. Generally, contractors charge an average hourly rate of $80 on labor costs, excluding material costs. Here are some benefits for your convenience: 

  • Guaranteed Results: What makes this a good investment? First, keep in mind that insulating your attic is a complex, dangerous task. You will need enough time to learn the skills involved and the right processes– which a professional is already well-versed with. 
  • Saved Time: Several factors, such as your insulation type and material and the size of your attic, will also need to be considered to pull off a successful project. This task can be rather time-consuming and leaves no room for even the most minor errors. It's why it is always a good idea to leave it in the hands of a professional. 
  • Proper Equipment: Accordingly, several insulation types may also require special machinery and equipment– such as a blower for blow-in insulation. Your contractors will have all these essential tools at the ready.
  • Safety: Attic insulation may be highly hazardous, especially when the tiny particles get inhaled. There is no need to worry about safety, though. Professionals will wear proper protective gear such as a high-grade dust mask, goggles, and gloves to carry out the process carefully. 

Checklist in Choosing Attic Insulation Contractors


Here's a brief checklist to consider in choosing a local insulation contractor to handle your attic project.

  • Prioritize contractors who are bonded, licensed, and insured
  • Check the company ratings on Better Business Bureau and Google
  • Choose companies that have been around in the attic insulation industry for more than three years
  • Ask if there is any warranty on the parts and labor

Frequently Asked Questions (FAQs)


Is it important to insulate my attic?

Yes, insulating your attic comes with few advantages that you can benefit from. It will prevent any interior and exterior air leaks that help you reduce your monthly energy bill. It also contains the seeping water vapor that may damage your home over time. Well-insulated attics are also keeping out pollutants that may harm you and your home.  

What is the best type of attic insulation?

The type of attic you have will determine the best kind of insulation for it, but blown-in materials work best for many homeowners. 

Why should I hire a professional for attic insulation?

Attic insulation jobs require proper disposing of harmful substances such as mold or asbestos, so it must be handled only by a professional. We do not recommend you attempt insulating your attic on your own.

Is air sealing required before insulation installation?

Air sealing isn't necessary but incredibly helpful in identifying existing air leaks that may render your insulation ineffective. So if you want to avoid higher energy bills and potentially costly repairs, you might want to consider air sealing before adding insulation. 

Which R-value insulation is ideal for an attic?

It is recommended for you to have a minimum of R-38 insulation. However, the required R-value can still change depending on your area.

How long does the insulation process take?

It may usually take at least 2 hours for attic insulations to be completed.

How long does my attic insulation last?

On average, the lifespan of attic insulation may last for 20 to 30 years, but degeneration can start as early as 15 years due to severe weather conditions and other outside interference.

How do I determine the right insulation amount for my attic?

You can determine the right insulation amount by considering these three essential factors:

  • Type of insulation used
  • Desired R-value
  • Size of the space to be insulated

What are some telling signs that my attic needs insulation?

If you heat your home during winter and your house remains cold, it only means that you need to replace or improve your insulation. Meanwhile, air conditioning during summer and your house stay warm also indicates the same insulation problem.

Final Thoughts


Bottom line, a properly insulated attic is a crucial component of any home. Ensuring the proper insulation in the attic space not only improves the home's air quality but will also help you cut costs on energy bills.

If you want to improve the quality of living in your home like never before– consider this your next home improvement project. Say goodbye to freezing winter nights and uncomfortable, sweltering summer days!  

Kenneth Wilson
October 14, 2021
Cost Guides, Interior

Kenneth Wilson

Retired contractor. Currently residing in Southwest Florida. Now in semi-retirement, I write and manage this blog focused on helping home owners make savvy decisions when it comes to finding contractors and getting their projects done.

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