• 11 JAN 19
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    Home & Room Addition Costs 2018-2019

    Home & Room Addition Costs 2018-2019

    • Average Cost: $42,000
    • Range: $21,000 – $65,000
    • Low Cost: $6,100
    • High Cost: $109,000

    How Much Does A House Addition Cost?

    From our experience and research online, the average cost of home or room additions is around $42,000, with most people spending between $21,000 and $65,000.

    Once you have decided to add an addition to your home you need to recognize this will be a big investment in money and time but if it done properly it will enhance the value of your biggest investment, your home!

    You are able to choose from many types of home additions including a ground level addition, second floor additions, and even detached additions. Every option will have benefits and drawbacks as well as estimated costs based on the factors such as the structure size and features that are to be included.

    How Much Does A Room Addition Cost?

    This will be a major construction project meaning you have to create an additional building structure and assure it is integrated with the rest of your house. Average room additions costs run from $80 to $200 per sq. ft.

    A homeowner that decides to add a room will often add on a bedroom, a family room or multiple rooms. Whenever you want to add additional rooms to your home, you will have two options: build up or build out.

    Regardless of whether you build up our build out, you will need to do the following:

    • Hire a remodeling company or general contractor.
    • Consult with an architect before you start to ensure that the design will work with your home which helps to enhance the resale value.
    • Hire a structural engineer to ensure that the plans are safe and sound.

    If you build out, it normally involves adding a room(s) at ground level which is a very popular type of addition. Building out increases the footprint of your home by expanding on the perimeter outwards offering minimal disruption to the rest of your home. The drawbacks of this includes the loss of space, the cost of having to pour a new foundation on your property and there may be a need for zoning variance based on the regulations of your local area.

    If you want to expand your living area without increasing your homes footprint, then building up is a great option. For this addition, you will add a room to the second story or even add a whole second story to your home. Though the contractor won’t need to create a new foundation, they may have to strengthen the existing foundation to support the extra weight. However,  you will have to check the town regulations to make sure that you aren’t limited on the height of your home. You will also have to add a staircase which will take up between 80 square feet to 120 square feet of your living space.

    How Much Does A Sunroom Addition Cost?

    A sunroom addition can be a cost-efficient alternative to more traditional home additions. According to Patio Enclosures, the average sunroom addition costs run from $16,000 all the way up to $70,000 or higher for a 200-square foot addition with a slab foundation and footings. The overall cost for a project like this will depend on how much space it will be adding, the extras like electrical wiring or if it is heated for a 4-season room or not heated for a 3-season room and the location of the sunroom. Other things to consider including hiring:

    • Carpenters: will charge around $75 per hour
    • Electricians: will charge around $55 to $150 per hour
    • Painters: will charge around $25 to $50 per hour

    Purchasing a prefabricated sunroom can cost about $12,000 per 150 square feet. Once you have factored in adding electricity, heat and the construction costs, it is not unusual to pay between $350 to $450 per square foot for a finished product. If you are wanting to keep the costs low, then you should consider adding a 3-season room without any heating.

    Before you ever decide on a sunroom, get a few estimates to ensure that you’re getting the best competitive pricing. Meet with a professional who is able to assess the space, take accurate measurements and recommend the construction methods and finishes that will work best for your climate, your property and for you.

    How Much Does A Detached Addition Cost?

    Detached additions range in price and style, with simple, prefabricated shed-like rooms running around $15,000 without heat or electricity, or guesthouses that share around the same cost as a detached garage addition, which run around $24,000 on average. Just like other addition types, you will need to hire a contractor for the installation and finishing the detached addition. You will also need an electrician to add the needed wiring and a painter to finish the walls.

    Just like with other additions, the materials that you pick will have an impact on the cost of the project. You should consider the following:

    • Are you purchasing a prefabricated addition?
    • What will the exterior look like? Will it match your home? (Siding will cost between $5 to $10 per square foot.)
    • Will the area need to be excavated? (This could cost around $75 per cubic yard)
    • Are you building an addition from the ground up? (You may need to have an architect which can cost about $5,000 extra.)

    Addition Cost Factors

    When you start planning the budget for your project, you have to consider a lot of factors, including the size of the addition and square footage. The bigger you go, the more expensive it will be. Other factors may include needed services such as:

    • Architect services to ensure that the design looks good with the style of your home. This will make up between 15% to 20% of the project budget.
    • Demolition, excavation, and site preparation cost will depend on the work that needs to be done for preparation. For instance, removing a wall is between $350 to $550 while excavation is around $3,000 on average.
    • Pouring concrete footings and a slab foundation will cost about $80 per cubic foot.
    • Roof trusses and support beams have to be integrated with the structure of the home. This can run between $20 to $35 per square foot, depending on the lumber charges and labor costs.
    • Roofing on the addition will run between $85 to $125 per square foot of galvanized metal flashing and asphalt shingles. Slate and metal roofing are pricier options.
    • Installing trim finishes and vinyl siding to the exterior will cost about $10 per square foot.
    • Finishing the interior by adding drywall to the walls and ceilings will cost about $10 per sheet of drywall.
    • Insulation is about $5 per square foot.
    • Doors cost about $200 or more, depending on the style and material of the door.
    • Adding windows for ventilation and light can cost between $350 to $750 per window.
    • Molding for the ceilings will cost about $5 per foot.
    • Electrical wiring and ensuring the electrical system is up to code is vital and it requires licensed electricians, which cost about $60 to $120 per hour.
    • Tying into an existing HVAC system will vary, but the average cost for installing vents and ducts is about $1100.
    • Flooring options will include wood flooring ($4500), Natural stone tile ($2000), Linoleum/vinyl ($1200), Laminate ($2800), Carpeting ($1500), or ceramic tile ($1800).
    • If you are remodeling multiple rooms within the floor plan to make the addition flow naturally, visit a home remodel calculator to plan out your budget.

    Is an architect needed for a home addition?

    The real answer to this will depend on the complexity of your addition. If you are just adding on a simple family room that has one door into the rest of your home and a door to the outside, then a contractor can handle it without an architect. If you plan to be moving walls, redesigning how rooms flow into each other, adding a spiral staircase, a half loft, or planning other intricate or complex changes, then you may need an architect.

    Architects can add to the cost of your project, but consider that professional engineers can take these ideas and build them into something really amazing. Not to mention when you add more clarity to your vision before the construction starts, the cost estimates will be closer to the mark. Whenever the project is done using an architect, you are also very likely to have something that boosts your home value.

    Dealing With The Contractor

    • Agree on a price and the payment schedules at the beginning
    • You want to get everything in writing. First, you need to agree on a total amount before you go any further.
    • It is reasonable that contractors will expect some money upfront, and then again after certain milestones during the project. You should be aware that handing over too much money can put you at risk and giving just a little can put your contractor at risk. It is a delicate balance, but it is one that needs to be figured out before anyone starts anything.
    • It doesn’t matter how detailed your plan is, you need to keep in mind that things happen. Find out about the change order policy from your contractor. Once you see the addition come to life, you could change your mind about the fixtures, the colors or layout of the room. You could find that your contractor had no understanding of what you wanted and made choices that didn’t come close to what you wanted. Or maybe the addition could have had some issues that neither of you foreseen. These issues can have big effects on the project costs and can cause issues with your contractor. To minimize the conflicts, be as clear as possible at the start about how each of these should be handled.

    FAQs About Home & Room Additions

    Will the addition add to my home value?

    Even if you have no plans to sell your home, you should consider the resale value of your project. You may not always turn a profit on the expansion investment, but you should have realistic expectations about some sort of payback. Home additions are up there with other expensive home projects and there are times that the return is less on the investment than a remodel. If you are really adding to the square footage of your home or you are adding some important rooms like a bathroom or bedroom, then your investment could really pay off.

    Experts have stated that you could have return investments of:

    • Add 66% value for a Second story addition with a master suite upstairs and a living area downstairs
    • Add 63% value for a master suite addition
    • Add 53% value for a bathroom addition
    • Add 49% value for a sunroom addition

    Will an addition look like it was just tacked on?

    Without the help of an architect or designer, then you could be left with an addition that looks like an obvious add-on or afterthought. Skilled designers can create the space you are wanting and make it tie into your home so that it looked like it was always there.

    Should I worry about restrictions?

    You should always check with your local government about zoning restrictions. There are some areas that you not be able to build within a certain distance from the rear, front or sides of the property lines. Other areas have rules about how much space on your property can be covered with a building, how high you can build up and how close you can get to protected spaces such as wetlands.

    What do I need to look for in a remodeling company or contractor?

    You should verify that the professional is insured and licensed. Check for references and ask for pictures of recent projects. Ask how long that they have been doing this work, how long they expect the project to take, and how they screen their subcontractors. Get estimates from 3 contractors so that you will get competitive prices and find the one that will work best for you.

    What should the first step be?

    You need to create a plan for your new addition, find a contractor to do the work and get all the permits. This is a major project that will require local permits to ensure that it is done according to local building codes.

    How to save money before an addition?

    Adding on to your home can be expensive, but there are ways to save money. For instance, you could just remodel instead of adding on. You could finish the basement which costs about $3000 to provide an extra bedroom with a bathroom or a living space. Increasing efficiency of the space can make an addition unneeded. For instance, adding 200 square feet to your kitchen can cost between $50,000 and $100,000. Swapping old cabinets for more organized, custom cabinets can cost about $36,000, but it may be all that you need which is saving you up to $65,000.

    Other options are using a detached addition instead of an attached one. Prefabricated detached structures can cost under $25,000 and it could be used as an office or guesthouse to provide extra space that you want. Believe it or not but building up can save you some money on your project, simply by avoiding the costs for excavations and getting a new foundation poured.

    Also, consider just how handy you are. Tackle the DIY projects like laying flooring, installing a new vanity, painting the walls on your own instead of paying a contractor. Doing your own demolition for instance can save about $600 in labor costs.

    Atchison Construction Builds Home & Room Additions In Phoenix, Arizona


    If you’re interested in building onto your home with a home addition or room addition project in Phoenix, ARizona, Atchison Construction is here to help!  Our experienced design, demolition, and construction team knows how to plan, get permits, and complete all stages of home addition projects.  From a small reading room to a large addition our team will help you build the space of your dreams anywhere in the Phoenix Valley.  For more information about how much your dream home addition will cost please get in touch with us by calling (602) 478-9870.

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  • Posted by Sandra Tapia on May 6, 2018, 11:41 pm

    Do you provide residential room additions (and remodeling) to the Waddell area? I saw your area of coverage map and your coverage seems to extend to Loop 303 (Bob Stump Memorial Freeway). Our new home (not yet in our possession) is located in Waddell about 1-2 miles west of Loop 303. We are hoping you can help us with additions/remodeling when we move in, in about 2 months. Please let me know so that I can start looking for another contractor if you dont service the Waddell area.

    Thank you.

    Sandy Tapia
    602-717-0658

    Reply →
  • Posted by Daphne Gilpin on June 13, 2019, 5:32 pm

    Thanks for explaining that the materials we pick for a detached garage addition will have an effect on the overall cost for the whole project. My husband and I live in an area that gets a lot of snow, so we’re thinking about having a detached gar added to protect our cars from the weather. I’m glad I read your article because you gave me a better idea of what to expect from finding and working with a garage builder.

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  • Posted by Sarah Smith on July 22, 2019, 4:15 pm

    Thanks for explaining that we should go over our home structure and floor plan with the contractor we choose to make sure our addition is both attractive and useful. My husband and I really like the idea of having a sunroom added so we can have a space to relax or enjoy the scenery. I’m glad I read your article because now I’m excited to find a contractor and start discussing the details of achieving a beautiful and functional sunroom addition!

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