How Much Does a Home Addition Cost?

Curious about the cost to add onto your home? Several factors affect the price of a home addition—such as the type and scope of the project, where you live, and more. Check out our guide to learn more about the cost of home additions.

How Much Does a Home Addition Cost?

While the cost of home additions can vary significantly depending on a number of circumstances, there is data available on the typical price range of these projects. Take a look at these figures representing the average total cost of home additions within different price ranges:

  • Low-end price range: $5,000 – $10,000
  • Average price range: $22,000 – $81,000
  • High-end price range: $100,000+

Factors That Affect Home Addition Cost

Even the same type of home addition may carry a different price tag, depending on the circumstances. Consider these cost-altering factors when planning your home addition.

Geographic Location

Variations in nearby economies, differences in available materials, and even the local climate may influence how much it costs to add onto your home. For instance, some parts of the country may have easier, more affordable access to materials but higher labor costs or vice versa. The type of soil may also impact the cost of a home addition, since certain soils are more difficult to build on—and some weather types or seasons can pause projects.

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Size & Scope of the Home Addition

When it comes to the price of home additions, the amount of square footage you add to your home will directly correlate with the cost. Other things that may influence price include the timeline, amount of work being done, number of contractors assigned to the project, and whether or not additional professionals—like architects, electricians, or plumbers—will need to be contracted. Thankfully, higher cost also translates to greater value added to your home.

Required Materials

If your addition requires materials that are expensive or cost a lot to transport to your area, your new home addition’s cost can easily increase. And of course, the larger the project is, the more materials you’ll need to buy—which will naturally increase the project’s overall cost.

Permits & Labor

Obviously, the complexity of the project and amount of laborers needed for the home addition will impact how much it costs to complete. That said, the price of labor may also be affected by the required permits—from standard zoning and building permits to more specific permits, such as those for plumbing and electricity.

Types of Home Additions

Different kinds of home additions carry different costs due to the complexity of the work, the amount of square footage, and more. Here are a few of the most common home additions, along with the average price range for each.


Accessory Dwelling Units (ADUs), also known as in-law suites, are additional living spaces built on the same property as a primary residence. These can either be used by the homeowner or leased to tenants for additional income. The average cost of an ADU addition is between $150 to $350 per square foot, depending on contractors. Interested in adding an in-law suite at a lower price? Try a prefab ADU!

Second-Story Addition

Adding a second story onto your home is a popular, but expensive, home addition typically costing between $100 to $300 per square foot. This usually amounts to a total of $80,000 to $250,000 for a partial second story or $100,000 to $600,000 for a full second floor. That said, adding square footage to a home adds a lot of value, so this renovation project carries a high return on investment.

Basement Addition

Like second-story additions, basement additions give the home a boost in square footage, thus adding to its value. That said, adding a new basement to a home can be costly, with an average price tag between $30 to $75 per square foot or $60,000 to $150,000 in total. This is largely due to the intensity and complexity of the labor, which involves digging out the space beneath the house.

Single Room Addition

Adding a single room onto a house—like a bedroom, sunroom, home office, and more—will typically cost between $20,900 to $72,600. If you plan to use this space as a bedroom, be mindful of building requirements—these stipulations may influence whether the property is up to code, as well as how you’re legally able to list the room should you choose to sell.

Kitchen Addition

The price of a kitchen addition varies significantly depending on whether you’re building onto an existing kitchen or creating a new one entirely—with the former costing between $75 to $250 per square foot and the latter costing between $100 to $300 per square foot. The cost of adding a kitchen onto your home will also vary significantly depending on what features you include. A less expensive option is to add a kitchenette, which includes the basic features of a kitchen at a lower cost.

Bathroom Addition

Adding an extra bathroom to your home is a great way to boost home value. The average price range for a typical bathroom addition falls between $5,000 to $35,000. A more cost-effective option is to add a half bath instead of a full bath—or convert a half bath to a full bath.

Garage Addition

If your home currently lacks a garage, building one can add a lot of value to your property. The cost of a garage addition can vary significantly, depending on the size of the garage, which finishing touches and features are added, and whether it’s attached or detached from the main house. With all this in mind, the general range falls between $5,000 to $65,000.

Bump-Out Addition

Bump-outs, small home additions that increase the square footage of an existing room, are popular renovations that can be planned around most budgets. The average cost of a bump-out is $4,000 to $30,000, depending on how much space you add.

Ways to Reduce Home Addition Costs

While adding onto a house can be expensive, there are certain things you can do to reduce the cost of the addition. Here are a few tips:

  • Get multiple bids from contractors.
  • Ask your contractor about supplying your own materials or to use discounted or repurposed materials.
  • Handle finishing work and other final touches on your own.
  • Check for tax credits.
  • Build up rather than out.
  • Stick to your original plan and avoid unnecessary add-ons.


Need somewhere to store your belongings while your home addition is in progress? Extra Space Storage has storage facilities conveniently located throughout the country. Rent storage space near you!


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