How Much Does It Cost to Finish an Attic? [2025 Data]

The average cost to finish an attic is $20,000, but it can vary from $7,500 to $35,000 depending on what type of attic you want and the jobs involved. Expect costs between $30 and $60 per square foot for standard tasks including drywalling, adding insulation, and installing a fan, all of which can make an attic a comfortable living space.

How Much Does It Cost to Finish an Attic per Square Foot?

Finishing an attic generally costs between $30 and $60 per square foot, including labor and materials. This gives you an average overall cost of $4,000 to $16,000 for the standard sized attic.

Of course, the cost depends on how big your attic is and what type of finish you want. Simply installing drywall, utility flooring, and some basic electrical components to make storage space more inviting would be around $30 per square foot. If you're doing more than just basic refinishing to turn your attic into a true living space, you can pay as much as $200 per square foot.

Cost to Finish an Attic by Type of Conversion

Attics can suit many purposes, from simple storage to a fully functioning attic living space. Some costs are unavoidable no matter which you choose. For example, you may have to pay the cost of building a staircase if your attic is currently only accessible via a hatch. Bedrooms will require an egress window of at least 5.7 square feet to meet most building regulations.

The costs per type of attic conversion are broken down in the table below:

General Contractor Cost 

For most of the tasks involved in finishing an attic, you'll want to hire a local remodeling contractor specializing in attic conversion. General contractor fees make up about 10% to 20% of a project's total price, which amounts to about $300 to $500 per day plus $150 to $250 per day for each additional laborer. 

A general contractor may perform or oversee tasks such as drywalling, which costs $2,100, subflooring installation, which costs $3 to $10 per square foot, floor joist repair, which costs $6,000, painting, which costs $2 to $6 per square foot, and adding dormer windows, which costs $12,000 each.

Electrician Costs 

No matter how you finish your attic, you'll likely want electricity. Even the most basic storage space will likely benefit from lighting, especially if you don't already have windows. Expect to pay $750 to $3,200 to hire an electrician for your attic finishing project.

• Installing new wiring: $600 to $2,200

• Installing outlets: $300 each

• Installing light fixtures: $500 each

HVAC Technician Costs 

You may need to extend your home's HVAC system to reach your attic. In this case, an HVAC technician can perform the following tasks:

• Adding ductwork: $1 to $3 per square foot

• Attic insulation: $2,500

• Mini-split installation: $3,000

Additional Cost Factors

One reason for the wide range in attic finishing costs is that many factors can influence the total price. As you budget, consider how demolition, prep, permits, and décor may impact your project cost.

Demolition and Prep 

Whenever you remodel a space, expect some interior demolition costs of $2 to $8 per square foot. Demolition allows you to start from scratch on your design. Once demolition is complete, have your attic space inspected for pests. Pest control costs $50 to $500 depending on the extent of the problem.

Permits 

You'll likely need building permits if your attic finishing project involves any of the following:

• Conversion to a living space

• The addition of electrical or plumbing components

• New windows or fans

Expect permit costs of anywhere from $100 to $1,500 or more, depending on your local regulations and the amount of work you plan to do. Contact your local building department for specific cost information.

Structural Engineering 

Some attic conversions require structural updates, especially if the attic is oddly shaped or difficult to access. If you need to add height, extend space, or build a staircase, consider hiring a local structural engineer. They'll ensure your home can safely support the additional load from building materials, fixtures, and furniture. The cost to hire a structural engineer is $400 to $800.

Plumbing

If one of your goals for your finished attic is to add a bathroom, expect to pay $1,000 to $10,000 for the plumbing alone. Here are some common plumbing costs.

• Rough-in plumbing: $6,500 

• Installing a toilet: $400

• Installing a sink: $450

• Installing a shower: $8,000

DIY vs. Hiring a Pro

On average, it may cost you around $10,000 to finish an attack yourself. You could pay as little as $300 to create a simple storage space with an attic fan or upward of $50,000 for the materials needed to build a luxurious primary suite.

Either way, unless you're experienced with remodeling work, we highly recommend consulting with a professional contractor for tasks including window and dormer installation, electrical, plumbing, and expanding square footage.

Attic Remodel vs. Renovation

As you plan your attic finishing project, you'll likely hear and see the terms remodel and renovation. Each carries a different meaning, and the path you choose will influence your costs.

Does Finishing an Attic Increase Home Value?

In most cases, finishing an attic is an investment in your home that can raise its value by at least 50%. Attic conversions can also increase the square footage of your home and the number of bedrooms or bathrooms.

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 extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on 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.