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How Much Does A Home Addition Cost, And How Can You Afford It?

6-Minute Read


Say you love your home, but you feel that it’s missing something. That something could be another room, a garage or even a whole second floor. Home additions like these can expand your living space and add value to your home. The big question, though, is how much will your home addition cost?

In truth, it depends on what kind of addition you hope to make. Bigger additions obviously come with higher price tags, and whether you DIY this project or hire a contractor could make a huge difference in the total cost.

In this article, we’ll lay out factors that may affect the cost and give estimates for the type of home addition you’re planning.

Determining The Cost Of Your Addition

Before we get into any estimates, make sure you know and understand the scope of your home addition project. A big factor in the total cost of the project will be the square footage the addition will cover.

A large addition will require more materials for building. The materials needed will depend on the nature of your planned home addition. Keep the following variables in the back of your mind:


Site preparation. Before building anything, the building site must be prepared. This can include excavation, demolition or simply clearing the area, but depending on the work required you could be looking at a cost of $1,200 – $4,110.

Roofing. Any additional room or enclosed structure added to your home will need a roof overhead. Your chosen roofing materials will add to the total cost of the addition, but you can expect to pay $80 – $100 per square foot for a roof installation. This doesn’t include the necessary support beams and trusses you’ll have to purchase as well.

Ceilings and walls. Anything with a roof will have a ceiling and walls. Vinyl siding and trim will cost around $2 – $5 per square foot. Installing drywall can cost $1 – $3 per square foot, and insulation will be around $2 per square foot.

Flooring. Your cost for flooring will depend largely on your chosen materials per the square footage, but you can expect to spend around $1,500 – $4,500 installing a new floor. If you’re planning to match this flooring with the rest of your house, you’ll be a little more limited in what you choose to spend.

Foundation. An addition like a garage or an extra room will require a new foundation, which can run around $4,000 – $12,400, depending again on materials and square footage.

Fixtures and appliances. A room needs fixtures like doors, windows and certain appliances, depending on its function. Installing a door by itself can come to $950, and the cost of installing windows can depend on various factors. Keep in mind any appliances you’ll want installed in the new space, as well as if you need to hire an electrician or plumber for those services.

How Much Does An Addition Cost With A Contractor?

It’s one thing to pay for all of the necessary materials and services for a home addition, but if you’re not the DIY type then you may want to hire professional help. Labor costs can account for a high percentage of your total cost, though, so prepare to shell out for that professional touch.

Architect fees. An architect can design and draw up the blueprints for your home addition, ensuring it will be functional and seamlessly match the rest of the house. This type of service comes with a flat fee of around $2,020 – $8,390.

Labor costs. The cost you’ll pay in labor will depend on the scale of the addition and the materials requested, but labor costs typically account for 30% – 50% of your total bill. Professional demolition and site preparation alone can cost over $500. Make sure to verify any contractor is licensed and insured, and check any references they may have. You wouldn’t want to spend so much on a shoddy job.

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Popular Room Additions And Their Costs

A home addition can add an entirely new room to your house and provide a slew of new possibilities. Read some of these common home additions and the typical costs for these add-ons.

Kitchen Remodel

Most houses will already have a built-in kitchen, so this type of addition is more of an expansion. A minor kitchen remodeling can cost around $10,000 – $15,000, while a more upscale remodel can average out around $48,000 – $95,000. You should budget accordingly to ensure you can finance your kitchen remodel.

Bathroom Addition

This may come as a surprise, but a bathroom is one of the more expensive home additions you can make. Bathrooms require a large amount of plumbing to be installed in a small space, and flooring and fixtures cause the costs to add up quickly. The average bathroom addition costs around $18,000 – $47,000, as opposed to a less expensive bathroom remodel.


An additional bedroom can cost an average of $100 – $155 per square foot after roofing, flooring, foundation and other fixtures. A smaller room, let’s say one that’s 12x12, could put you out $12,400 – $22,300 on average. A larger room, like one that’s 20x20, gets you into the $34,400 – $62,200 range.


A mudroom has many functions. It can act as a vestibule to remove your coat and shoes in, so as not to track mud into the house. You can also use it for storage or for doing laundry. Depending on its size and the appliances you want installed, adding a mudroom can cost you $7,500 – $25,000.


Sunrooms can be ideal for relaxation while having the perfect view of the outdoors. Homeowners typically spend around $100 – $350 per square foot just on materials. To save time on construction, some homeowners opt to buy prefab sunrooms for $300 – $400 per square foot, though you will still have to cover the costs for the foundation, roofing, flooring and electricity.

Family Room

A functioning room for the whole family to enjoy will run around $86 – $200 per square foot, so a 500-square foot family room will cost homeowners around $43,000 – $104,000. This cost range covers the various installations, as well as the electrical and plumbing work.


A garage can keep your vehicles safe at night and, in the snowier states, can keep them from getting buried in the winter. Depending on materials, the cost to build a detached two-car garage is around $49 per square foot, and the cost goes up with every additional car. Because a garage requires less fixtures and appliances to function, it can be one of the less expensive home additions you can make. If your garage is attached to your home, you can save around $3,000 – $5,000 on this addition. Even so, there are options for garage financing you can consider for this home addition.

In-Law Suite

At some point, many homeowners may want to move their parents onto their property so as to always be nearby in case of emergencies. To avoid a home becoming too crowded, some may build what’s known as an in-law suite, which can function as a smaller apartment for one or two people.

An in-law suite is typically 600 – 750 square feet and includes the essentials: bedroom, living room, bathroom, kitchen or kitchenette and a laundry area. For a fully detached in-law suite addition, expect to pay around $78,000 – $135,000.

Average Home Addition Cost Per Square Foot

For an overall estimate on what your home addition may cost you, budget yourself based on the square footage of your addition. The size and scale of the addition can let you know what to expect when planning your budget.

The chart below provides home addition cost estimations based on a property’s square footage.

Square Footage

Average Cost


$17,200 – $41,600


$25,800 – $62,400


$43,000 – $104,000


$68,800 – $166,400


$86,000 – $208,000

10x10 room

$8,600 – $15,500

12x12 room

$12,400 – $22,300

16x16 room

$22,100 – $39,700

20x20 room

$34,400 – $62,200

Cost Of A Second Story Addition To Your Home

Some homeowners would rather expand upwards than outwards. Adding an entire second story to your home can be the most complex – and expensive – home addition you could make, especially if you plan to build multiple rooms on the new floor.

Minus any foundation costs, you will basically be constructing a new house on top of your current one. Framing, drywall, electrical and plumbing costs will all apply here, as well as roofing and flooring. At the end of the day, your cost for this project will land around $100,000 – $350,000, or $150 – $600 per square foot depending on design and materials.

How To Pay For House Addition Costs

We’ve thrown a lot of different prices at you, and many of them may look pretty steep. If you absolutely can’t wait to install a new home addition but you just don’t have the funds right now, consider taking out a personal loan. People often borrow personal loans for home improvement projects, and once approved they’re eligible to borrow up to a specific amount to finance the costs of their home addition.

And if you apply for a personal loan through Rocket Loans®, you could receive your funds up to $45,000 within 1 – 3 business days.

Final Thoughts: A Home Addition’s Value May Outweigh Its Cost

Home additions, whether they’re extra rooms, a garage or even a whole second floor, can build up costs quicker than you can count. If you’re the handy type, you may save on labor costs by going the DIY route, but if this is a timely project, the speed and precision of a professional contractor may make everything go a little smoother. In the end, though, you may have driven up your home’s value and created some additional space for yourself, your family and any guests.

To explore other loan options to cover home addition costs, read our guide to home improvement loans.

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