Additions & Remodeling Cost Guides

A new addition costs about $46,000, while remodeling the entire house costs about $47,000. The cost to remodel a kitchen is about $25,000, but only $10,000 for a bathroom. As you can see, building an addition or remodeling a house are some of the most expensive home renovation projects. Check out other popular addition and remodel costs below.

Find out how much your project will cost.

Updated February 22, 2022

Written by HomeAdvisor.

Proper research before you start an addition or remodeling project can help make these undertakings less scary. It will also help you decide what you want to accomplish and how much you’re willing to spend. A strategic execution will help ensure that your project increases the value of your home.

Select your Addition & Remodel project

A nice white bathroom
Remodel a Bathroom
(27,407 projects)
$12,063 Average National Cost
beautifully renovated farmhouse kitchen
Remodel a Kitchen
(12,604 projects)
$26,938 Average National Cost
Outdoor view of the modern house
Remodel or Renovate a House
(10,572 projects)
$51,774 Average National Cost
new basement remodeled and finished out
Remodel a Basement
(6,989 projects)
$22,632 Average National Cost
house with new addition built on
Build an Addition
(5,404 projects)
$50,284 Average National Cost
interior of home during demolition
Demo an Interior
(4,477 projects)
$2,976 Average National Cost
house requiring major home repairs to roof
Perform Home Renovations and Repairs
(4,130 projects)
$14,394 Average National Cost
land excavation on new home site
Excavate Land
(3,196 projects)
$3,957 Average National Cost
A modern house with glazed arbor
Build a Patio Enclosure
(2,837 projects)
$17,354 Average National Cost
Workers discussing in a construction site
Install Carpentry Framing
(2,414 projects)
$4,525 Average National Cost
building site being prepared for construction
Clear Land
(2,190 projects)
$3,745 Average National Cost
new garage built onto house
Build a Garage
(1,695 projects)
$29,333 Average National Cost
basement garage remodeled into family room
Renovate or Convert a Garage
(903 projects)
$16,462 Average National Cost
Empty basement with new concrete floor and white walls
Install a Foundation
(807 projects)
$9,396 Average National Cost
modern closet built in master bedroom of home
Build a Closet
(781 projects)
$2,131 Average National Cost
newly built barn on farm with tractor
Build a Barn, Shed or Playhouse
(684 projects)
$3,396 Average National Cost
modern kitchen updated by a kitchen designer with custom finishes
Hire a Kitchen Designer
(402 projects)
$17,576 Average National Cost
A man on a wheelchair using his phone while at his house
Remodel for Disability Accommodation
(394 projects)
$4,395 Average National Cost
built-in outdoor kitchen with grill and sink
Build an Outdoor Kitchen
(272 projects)
$16,251 Average National Cost
construction permit application being filled out
Get a Building Permit
(164 projects)
$1,658 Average National Cost
carport at the end of driveway next to house
Build a Carport
(154 projects)
$8,796 Average National Cost
steel support beam installed in room for support
Install Steel Beams
(129 projects)
$3,250 Average National Cost
construction manager with two crew members on site
Hire a Construction Manager
(106 projects)
$49,995 Average National Cost

Home Additions

The national average cost of building an addition is $46,000, although this cost varies greatly depending on the specific project. Additions only include projects that increase the house’s total living area horizontally or vertically. Vertical additions generally involve adding another floor to the house. Horizontal additions increase the size of existing floors.

Ranch Conversion Cost: Adding a Second Floor

Adding a second floor to a ranch house usually costs between $100 and $300 per square foot. But it can cost up to $500 per square foot depending on the quality of materials and complexity of the project. Assuming a cost of $200 per square foot, adding a floor with a total area of 800 square feet would cost $160,000.

Increasing the size of a ranch house is basically a matter of building up or out, each of which has advantages. The primary advantage of building a second floor is that it’s generally less expensive that extending the first floor. Cost considerations include building a staircase, strengthening the foundation and observing height restrictions.

Building a Basement

The cost of adding a basement to an existing house costs between $10,000 and $175,000. Unfinished basements are closer to the low end while finished ones cost more. In addition to size, the most important cost variables include location and soil conditions. The shape is also a major factor, since basements with more than four corners are more expensive.

The most common reasons for building an unfinished basement include adding storage space or a workshop. They don’t require the same amenities that living areas do. You may also want to build a finished basement for a den or bedroom when it isn’t possible to build up or out.

Raising a Roof

The cost of raising a roof is typically between $15,000 to $125,000, although it can be even higher. The size of your house and cost of labor in your area are the main cost variables. Additional cost factors include the need to move plumbing and electrical fixtures.

Increasing the living space in your home is the most common reason for raising its roof. You may also want to improve your roof line with this renovation option if you have a low or dropped ceiling. Additional reasons include improving the home, customizing its appearance and preventing weather damage.

Bump-Out Cost

The cost of a bump-out is highly dependent on the size. Bumping out a 10-foot wall by two feet costs about $17,000, or $850 per square foot. Bumping the same wall by four feet costs about $30,000, or about $750 per square foot. The biggest cost factors include location and the design of the existing room.

The specific meaning of the term “bump out” also varies. Some home renovation experts only consider the addition of an entire room to be a bump out. Others describe a bump out as any expansion of the living area.

Exterior Additions

An exterior addition like a barn, shed or playhouse costs between $10,000 and $100,000, with the average cost being about $50,000. A structure like a covered patio or carport only costs between $3,200 and $9,500, with an average cost of $6,400.

Both of these two types of additions are exterior structures that aren’t attached to the house. However, a barn is a complete structure with walls that may also have some of the fixtures you would in a house. In comparison, a structure like a carport typically consists only of a concrete floor and roof, but no walls or other features.

Home Extensions

An extension to an existing room costs between $600 and $750 per square foot, so a 12 x 6 extension would cost between $43,200 and $54,000. These figures assume a single-story extension with no unusual considerations. In contrast to an addition, an extension doesn’t increase the exterior dimensions of the house. However, it does increase the size of a particular room, generally by changing the location of a wall.

Kitchen Extension Cost

The cost of even a modest kitchen extension starts at $15,000, assuming the original kitchen is of average size. The costs may generally be divided into two separate projects: making the extension and building the new kitchen. However, the same team will usually work on both projects. Extending a kitchen costs more per square foot than extending basic living areas. This project usually involves relocating electrical and plumbing fixtures.

Kitchens are a popular choice for extensions due to the central role they play in most homes. They really open up the ground floor and may increase the value of your home.

Cost to Extend a Bathroom

Extending a bathroom costs a minimum of $10,000 to $12,000, even when the extension area is small. The cost of extending this room has more to do with moving plumbing fixtures than increasing its size. Installing new electrical fixtures, sanitary ware and tiles also adds to the cost.

One of the most common reasons for extending a bathroom is when the existing space isn’t large enough to get ready for work in the morning. This is especially likely to be the case when multiple people need to use it at the same time.

Vaulting a Ceiling into the Attic

The typical price range for vaulting a ceiling is between $18,000 and $25,000. This range assumes single-story home of typical design. It also assumes the room is a 20-foot square with an eight-foot ceiling, which will have a peak of 11 to 12 feet once the project is complete.

Vaulting a ceiling transforms a room by adding volume and light to it. The framing of the roof is one of the most important considerations. An attic with rafters leaves an open space that make this project much simpler. An attic that uses trusses makes vaulting the ceiling more complex, which will increase the cost by at least 20 percent.

Home Remodeling Projects

Extension & Remodeling Contractor Pricing

The typical costs of the professionals you’ll need for a home remodeling project are as follows:

You may need only one general contractor or a team, depending on the size and complexity of your project. You may also need other professionals such as a structural engineer. This step is particularly important when adding another story to your house.

Cost Factors for Your Home Remodeling or Addition Project

You’ll need to consider the costs of the following services for major renovation projects like additions and extensions:

In many cases, you’ll also need to live offsite during the project, depending on the room and size of the project. Some projects will require additional work on the exterior of your home to accommodate the interior changes.


Is it cheaper to add on or to build up on a house?

Building up is generally cheaper than adding on, which can be a major consideration if you’re on a tight remodeling budget. Builders don’t need to be nearly as concerned about preserving the existing structure when adding a new floor. However, factors that restrict the exterior of the house can greatly increase the cost of building up.

What remodel or renovation adds the most value to your home?

Kitchen and bathroom remodels generally provide the best return on investment (ROI) for remodeling projects. Nearly every prospective homeowner will appreciate improvements to these areas of the house. Another bedroom can also provide a positive ROI if your house currently has only two or three bedrooms.

How can I keep a low budget for a home addition or remodel?

Reduce your remodeling costs by refinishing your existing materials rather than replacing them. If you do buy new materials, you should know that there’s a large price difference between some common choices that appear similar. For example, laminate flooring is cheaper than hardwood flooring, while fiberglass cost less than ceramic tile.