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Home Addition Cost


How Much Does a Home Addition Cost?

 
average costMedium: $13,891-$16,297high costHigh: $94,918-$122,085
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Remodeling an existing home almost always costs more per square foot than new construction, because the renovation must match the existing structure, which may not be level or straight. However, a home addition can add desired space without the hassle of moving to a new home.

Typical costs:

  • Adding a bathroom by converting existing floor space starts around $3,000-$6,000 (depending on easy access, size and quality of fixtures and other amenities) but can run $7,000-$25,000 or more for spa-like master baths or projects with poor access to existing utilities or requiring foundation reinforcement. Do-It-Yourself supplies start around $500-$1,500 for a basic bathroom or half-bathroom, but can run $2,000-$4,000 or more for a larger spa-like project. Having a contractor add new floor space for a bathroom starts around $25,000-$50,000 but can go up to $40,000-$80,000 or more for a spa-like room.
  • Converting existing floor space into a bedroom as a do-it-yourself project runs anywhere from $200-$5,000 or more depending on what's involved; hiring a contractor can be $7,500-$50,000 or more. Adding new floor space for a basic 10x15-foot bedroom runs around $3,750-$7,500 for an entirely do-it-yourself project or $7,500-$22,500 or more to hire a contractor. The cost of adding a porch can range from $50-$120 for do-it-yourself materials for a simple concrete slab to $3,000-$6,000 to have someone pour a 50x20-foot slab.
  • Converting existing floor space into a family room as a do-it-yourself project runs anywhere from $200-$5,000 or more depending on the complexity of the project, the quality of the materials and your skill level; hiring a contractor for the conversion can be anywhere from $7,500-$25,000, depending on what's included. Adding new floor space for a 400-square-foot family room can run $10,000-$20,000 for a do-it-yourself project, or $30,000-$100,000 or more for an addition built by a contractor.
  • Adding a 1,500-square-foot second floor with large sections done as a do-it-yourself project (plus serving as your own general contractor when needed) can run $105,000-$225,000; hiring a remodeling contractor for the same project can be $225,000-$450,000.
  • Adding a small 10x12-foot wood deck can run $500-$1,000 for do-it-yourself materials or $1,000-$1,900 to hire someone to build it. A larger deck of wood or plastic composite can be $4,000-$25,000 or more depending on size, materials and complexity.
Related articles: Interior Decorator, Bedroom Addition, Family Room Addition, Second Floor Addition, Bathroom Addition, Kitchen Remodeling

What should be included:
  • Each city or county has its own requirements for how much square footage you can add based on the amount of land.
  • Better Homes and Gardens explains what to consider in siting[1] your home addition. RemodelOrMove.com gives a detailed list of potential costs[2] for a home addition.
  • Construction work can be extremely disruptive, and often involves a crew working inside your home starting early each morning, which will change your family routines. Talk with the contractor about scheduling, and when water, electricity or other utilities might be turned off.
Additional costs:
  • Usually an addition will trigger a reassessment of your property taxes and a resulting tax increase, but in most areas the reassessment will only be on the value of the addition, not for your entire house. A large addition can also increase your monthly utility bills.
Shopping for a home addition:
  • To hire a general contractor to handle all aspects of a complex addition, the National Association for the Remodeling Industry provides an online booklet with tips[3] for hiring a contractor, as well as contractor referrals[4] .
  • Check whether a contractor is licensed[5] in your state, and whether there are any complaints with the Better Business Bureau[6] . A written contract should include a detailed outline of the work required and materials used, dates within which the project will be done, and a payment schedule.
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What People Are Paying - Recent Comments

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Medium room addition
Amount: $0.00
Posted by: JenRab in Burbank, CA.Posted: March 9th, 2013 12:03PM
Sq Ft of Addition: 168Which Floor: first
Number of Rooms: one
I am a licensed contractor who has worked as a subcontractor for many remodelers here in SoCal. Most of them are looking to get rich from oblivious homeowners, and will hire illegals to do most of the work and pay them $8/hr (which they are thrilled to get)then rip the customer by jacking up costs of plans, permits and materials to pay for their new trucks, boats etc. It's shameful, thank god I can do the work myself! A medium room addition should cost under $30,000.
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farmers porch
Amount: $12,000.00
Posted by: Gi in Manchester, NH.Posted: February 6th, 2013 01:02PM
Sq Ft of Addition: 240Which Floor: first
Number of Rooms: 1
It was a rocky start but it was finally finished and it was well worth the wait
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Bath and kitchen remodel
Amount: $17,000.00
Posted by: Jill35 in Charlestown, RI.Posted: December 21st, 2012 02:12AM
Number of Rooms: 2
Jdh home improvement came and redid the kitchen and our bathroom..They were very professional and Jeremy was there actually doing the work.I would recommend this company and will definitely use them again Jdh home improvement 401-688-3639
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Add a bedroom
Amount: $12,800.00
Posted by: Larry in Dallas, GA in Dallas, GA.Posted: September 24th, 2012 09:09AM
Sq Ft of Addition: 168Which Floor: main
Number of Rooms: 1
Add on bedroom 12x16. Complete with HVAC,electric, light/fan, windows and two doors, and primed for painting. Excellent contractor with an outstanding history.
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Re-modeling and additions
Amount: $0.00
Posted by: Skilled Tradesman in Morton, PA.Posted: September 9th, 2012 04:09AM
Anyone writing on here who is concerned solely with price... don't get the work done. When work in your home is not done correctly it will present problems for the rest of your stay. I have worked with several contractors and the desparity in quality is sickening. That being said, some of the expensive guys sucked and all of the low-ball guys sucked. You really need to interview the contractor and get to know them and do your homework. Plenty of scum bags talk a good line and wear a hammer loop.
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I want to an addition
Amount: $0.00
Posted by: Kamo in escanaba, MI.Posted: August 27th, 2012 08:08AM
Sq Ft of Addition: 300Which Floor: 2
Number of Rooms: 1
So what i want to do is add a master bd/bath upstairs. It would extend over the lower lvl of the house. So what I would need the area built and weather tight. I can finish the inside (electric, plumbing, etc) and outside. The room would be roughly 20x15. Any ideas how much this would cost?
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Be mindful of contractors that quote "per square foot".
Amount: $0.00
Posted by: Brian G. in Indianapolis, IN.Posted: August 24th, 2012 02:08PM
Never, EVER, trust a contractor that only provides quotes based on the square footage being added. Not all projects are the same and for a contractor to quote based only on the square footage means they're going to RIP YOU OFF.

This is an acceptable way to get a very rough estimate, but when you actually get a quote from a contractor their estimate should include an extremely detailed list of materials, subcontractor costs (including materials) and their estimated labor hours and what the cost per hour will be. And once you've got it in writing, go over it in detail, ask questions and then have them sign a contract.
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Room Addition
Amount: $45,000.00
Posted by: researcher in Middlesboro, KY.Posted: December 17th, 2011 12:12AM
Sq Ft of Addition: 468Which Floor: rear of house/ new room
Number of Rooms: 1
First addition to my home. Can someone tell me what they think of this contract. A room addition that will be 26x18 in the rear of the house for $45,000. Built from the ground up, completely drywalled finish ready to paint, built deck ready to apply flooring, 10 windows 5ftx33'' with a door, standard electrical job with a heating and air unit (similar to one found in a hotelroom), outside will have siding, dry pipe will be redirected, entire job fully warrantied. Should I select this contractor?
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addition after gable end
Amount: $0.00
Posted by: Lim in fremont, CA.Posted: August 26th, 2011 03:08PM
Sq Ft of Addition: 300Which Floor: 1st
Number of Rooms: 1
I live in Fremont,CA.
In between gable end and my neighbor fence have huge space(18ft) which I currently have plastic shed.
I want to extend living room and want to have one room.
it'll be looked like following drawing.
Imagine square is my current house, and * is fence, and || stucco wall, | is drywall.
Right side will be my addition
current ---------> addition
+======|| * +=============|| *
| LR || * | LR || *
| ----||<18ft>* --> | ----+-----|| *
| kitch|| * |kitchen| room|| *
+======|| * +=======+=====|| *
backyard backyard
So, it's pretty simple addition from construction stand point of view since it is on the ground level and it is same direction in that of existing ridge board, no plumbing involved and a few electrical work.
In the room, I want to have ceiling light, window(of course) and sliding patio door out to backyard, and storage room. Of course a couple of outlet should be available to function as a room to use TV, PC...
In the extended living room, I want to have one ceiling fan.(there is already one but maybe it's better to have one more)
Any approx cost idea from foundation to roof finish? one of guy told me it'll be in between 200~300 but considering the simplicity of work, I think it's a bit pricey.
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Simple addition
Amount: $0.00
Posted by: Waxy in Readington, NJ.Posted: August 21st, 2011 03:08PM
Sq Ft of Addition: 400Which Floor:
Number of Rooms: 1
I have a 20 by 30 deck that I would like to convert into a family room. No closets or anything. All windows and hardwood floors. What could I expect to pay for this.
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2nd floor bedroom extension over kitchen
Amount: $10.00
Posted by: Ctduff in Manchester, CT.Posted: August 14th, 2011 02:08AM
Sq Ft of Addition: 10 x 12Which Floor: 2nd
Number of Rooms: 1
Considering a 2 nd floor addition to extend a bedroom out over afirst floor kitchen. Is 10 gs enough considering all I want is a box with a roof?
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addition
Amount: $40,000.00
Posted by: mr giddings in balt., MD.Posted: July 19th, 2011 10:07PM
Sq Ft of Addition: 150 to 300Which Floor: 1st. level
Number of Rooms: 4
As a contractor, who has been building for over 30 yrs., the gentleman was correct it matters where you live and the old saying " you get what you pay for". When your not a fly by nite, slap it up and over, temp. contractor, it cost money to run your buss. correctly,, i provide a very good warranty and quality building.your safety and quality in building come 1st.Go to my website and see what i have to say about unlice,unskilled,undocumented so called contractors. If your going to do something do it right, contractors are not getting as rich as you think, mike giddings giddings contracting
www.gcbuildandremodel.com
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Home addition
Amount: $36,000.00
Posted by: WeloveJ&amp;BConstruction573-201-5064 in St Robert, MO.Posted: May 15th, 2011 06:05PM
Sq Ft of Addition: 1200Which Floor: 1 and 2
Number of Rooms: 3
We needed a game room and two new bedrooms built onto our house and after calling J&B Construction 573-201-5064, we received exactly what we were looking for, and more. They were there when they said they would be, they worked very hard and fast to get the work done on time, [actually 3.5 weeks ahead of schedule] their work was very high quality and very great price. Perfect all around transaction. J&B Construction 573-201-5064 is the only company we will ever call for our building and repair needs!
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Sqft pricing
Amount: $0.00
Posted by: rarayford@comcast.net in livermore, CA.Posted: March 1st, 2011 06:03AM
Sq Ft of Addition: variesWhich Floor: 1
For the inquiries about pricing per/sqft. Only after the estimating against the plans is complete, you can come up with a price per/sqft. Most contractors reduce the final number to "cost per/sqft". This number can be shared with the customer or not. Many times the customer will arrive at this calculation on their own. A builder would be taking a gamble by giving a sqft price without doing the pencil work. The interior finishes alone could run $50/up per/sqft. So, with this in mind it is better for a consumer to have a budget before starting a project. This will help determine the needs over the wants.
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Add a bath and a bedroom
Amount: $0.00
Posted by: Dr D in San Jose, CA.Posted: February 17th, 2011 04:02PM
Sq Ft of Addition: 500Which Floor: 1
How much would it cost per sqft if I need to add roof as well? Having DIY as well as lic contractor's estimates would help. Someone who has already done a similar project may please share the expenditure info.
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Remodeling/ Addition sq/pricing
Amount: $148.00
Posted by: Rick C in San Jose, CA.Posted: February 8th, 2011 05:02PM
No licensed contractor in his right mind will give a price by sq footage. Local pricing will vary from region to region. Save big by doing it yourself. However, don't confuse DIY with hiring a legal licensed contractor who will service and warrant his work. He needs to make money to stay in business. He is not obligated to work for free as every unreasonable person would like. To find out if there is value in the proposal price go to the local assessors website and find out the latest valueation for the property improvments and get the cost per foot for what is already there. Any new footage and footage for remodel are need to be factored in. Remodeled footage price can be as much as the additonal space but must be figured appropriately. If the proposal price is less than footage price of existin you may have a great deal depending on what is done. It would be a good value. It is not free even if it is bonus space. Many who have commented here have no grey matter between the ears. So sad. I had a gentleman call requesting price for 250SF addition. I told him to send me the plans to bid. Possibly, it could be a low as $25000 but costing would reveal true cost. Turns out it was over $37,000 and the details of construction were still not nailed down. The roof was over 650 sf and impacting the cost. The addition would cost approx. $148/ft, The assessed value of the existing house was $250 for a home almost 50 yrs old. I told the man the proposal was a bargain considering what he had already given for an old house and I also said that since he was an engineer he should be able to understand numbers and know the truth of what I said. He still wanted something for nothing. Ridiculous reasoning.
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Answer for Hester
Amount: $110.00
Posted by: texstarservices.com in houston, TX.Posted: January 17th, 2011 10:01AM
Sq Ft of Addition: 150Which Floor: ground
Number of Rooms: 1
Most of your older homes have very small master baths. you can recoup most if not all of your cost on resale when it comes to kitchen and bath. However you will be going from a 4 bedroom to a three if you use that space.but you wont have to expand by adding on. If you would like I could have a look at it. texstarservices.com
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cost of room addition in houston
Amount: $110.00
Posted by: texstarservices.com in houston, TX.Posted: January 17th, 2011 10:01AM
Sq Ft of Addition: most sizesWhich Floor: first and second
Number of Rooms: any
most room additions in houston will start about $110sf. they will go up depending on what goes into the room such as custom wood work and such. You can allways find someone for less but you will get what you pay for. I have been doing this for over twenty years now and I am very knowledgeable about services and all the cost.
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Answer for Newbie
Amount: $90.00
Posted by: Rarayford@comcast.net in Livermore, CA.Posted: January 8th, 2011 07:01AM
Sq Ft of Addition: Which Floor: 2nd
Newbie, I am a Lic. Contractor that's been doing additions and remodels from San Francisco to L.A prices varies. You can expect to send a base price of $90.00-$120.00sf for your addition. This cost will increase based on your finish/upgraded materials. Do your homework, all Building Contractors are not the same.
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master bath addition, or convert small 4th bedroom adjacent to master bd
Amount: $0.00
Posted by: Hester in League City, TX.Posted: December 26th, 2010 07:12PM
Sq Ft of Addition: 150 sq ftWhich Floor: ground
Number of Rooms: 1
We bought a house that was built in 1979, and we love all of it except the tiny!! masterbath which has that motel look with the vanity open to the bedroom. The house is 2800 sq feet, and it has 4 bedrooms. We are wondering about initial cost of (as well as resale recoup) either converting the 4th small bedroom adjacent to master bedroom to a larger spa bath with additional closet space, or adding an addition to the back side of the master extending the existing bath out. Our lot is over half an acre, so yard space is not an issue. We do not use the bedroom except for storage. Anyone have any advice?
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add on
Amount: $0.00
Posted by: sarabethtaylor@yahoo.com in cape girardeau, MO.Posted: December 21st, 2010 04:12PM
Sq Ft of Addition: 400Which Floor: main
Number of Rooms: 2
i would like to know about how much it would cost to add a master bedroom 300 square feet and a 70 sq foot bath and 30 sq ft closet. this would include 3 windows.
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Question for NEWBIE!
Amount: $100,000.00
Posted by: Carrie Thanksforyourhelp in Benicia, CA.Posted: September 5th, 2010 01:09PM
Sq Ft of Addition: 800Which Floor: 2nd
Number of Rooms: 3
The amount I have put in is a wild guess!
Okay I am in Benicia. We would like to add a 2nd floor to an existing modest 900 square foot house. The house is currently 3 bedroom 1 bath with wonderful views. We want to add a master bedroom suite on top floor with jacuzzi bath taking advantage of the corner views plus an additional small guest bedroom and shower/bath. We want to do it right,(permitting etc) but don't have a giant budget. what would the diff be if we just did a big old box upstairs with modest bath (maybe 300 sq feet?) vs adding the 2 bedroom 2 baths as described? Thanks! We are newbies and have no clue.
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Tennessee Addition Costs
Amount: $55,000.00
Posted by: Harrison Jim in Harrison, TN.Posted: July 27th, 2010 06:07PM
Sq Ft of Addition: 1700Which Floor: New space
Number of Rooms: 6
Added a 20X20 Master Bedroom, 18X12 Master Bath w/ 29' walk in closets on both sides, a private 4X4 Master bath toilet (enclosed), one 10" double bowl and 5' single bowl vanity, 5X5 Sliding glass door steam shower with four body sprays and pan head, and a jaccuzi tub. Added a 7X11 laundry room, 8X11 pantry, 11X13 Study, 15X16 Family room with private 4X4 Toilet, 13X18 bonus room and a two 3/4 car garage, part of which is a 20X6 lawn/tool storage room. All work with the exception of grading, foundation, load bearing framing/exterior sheathing, concrete, and drywall finishing accomplished by homeowner. Current prices in our neighborhood are at $100 dollars/ft. Realistic pricing as this is now the biggest in the neighborhood is $75.00/ft. Value improvement is approximately 152K which is about what it would have cost to have a General Contractor do it. So in Tennessee, plan on spending between $75 to $95 dollars per ft. if using a contractor. As always, the more that you can do yourself, the more you save/make!
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Under quoted
Amount: $10,700.00
Posted by: henry69 in Seal Beach, CA.Posted: July 10th, 2010 10:07PM
Sq Ft of Addition: 480Which Floor: ground flr
Number of Rooms: 2 Office rms
I made a big booboo recently when I tried to have my warehouse converted into a infusion service center. My partner said he could do it for 10,000.00. But he was not licensed or insured. And the Office bldg owners required a license architect and Contractor with general liability Insurance to do the Job. Most of the quotes came in at between 22,000 and 28,000 for the Job. A friend of my mothers agreed to do it for 10,700.00 including most of the Materials. Eventhough he and his crew did most of the work and bought most of the materials, they only worked at night and when they could squeeze in the time. Eventually I had to finish the job with other contractors but using the permits of the original contractors. The job is complete now and looks good. But I saved myself several thousands by going this route. I feel though somewhat guilty, because I still owe the original contractor 3500.00. But they have moved to another state and I cannot find them. Any comments on this?
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Outrageous Costs
Amount: $0.00
Posted by: OC in San Jose, CA.Posted: May 29th, 2010 04:05PM
Sq Ft of Addition: 3500Which Floor: 1st & 2nd
Number of Rooms: 5
$320/sq ft? Are you kidding? Who charges that much for a simple sq ft. The Bay Area businesses are still trying to rip people beyond belief. This is, in part, what got us into this damn mess of the Depression(yes thats what it is, just a smaller version of the 1930's?) Between the Banks, Real Estate Co's & Contractors we're doomed in the Bay Area to recover anytime soon. All you real estate co's & builders/contractors just dont get it, do you? You think you can mark up stuff 100%, 200% or more & it'll have no efect on the economy down the road. Wake up already.Is your greed so great you have to take that kind of money from people? Absurd.
If I want to add 3500 sq ft to house thats 4000 sq ft already & add both 1st & 2nd flr theres no way it should cost more than $500,000 period, incl 2 bathrooms, 2 bdrms, a game room w/home theatre system, & high level security for the house. $320 per sq ft. The damn lumber & drywall, paint, nails etc doesn't cost anywhere near that nor the labor. One can build a 5000 sq ft house with high end everything for under $600,000. My goodness people are so greedy nowadays. No wonder we're heading downwards instead of upwards. last in education of all the major countries, last in getting global warming under control, & still trying to rip people off to make that extra buck.
When I do my addition I'll find someone reputable thats honest & cares about what my needs are rather than the bottom line.
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2nd floor
Amount: $0.00
Posted by: T Scott in Quincy, MA.Posted: May 23rd, 2010 04:05AM
Number of Rooms: 3
I am wondering what the cost range is to raise/replace a roof & the end to end 2nd floor addition? I have an unfinished attic which the roof would need to be raised 3-4 feet. I am 6'4 and I can walk down the center of the attic due to a low roof line. I would like to add one bathroom and two or three bedrooms. 1200 sq ft. no fancy extras! New baby & we need extra space... please advise.
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wtf
Amount: $7,000.00
Posted by: tj in deltona, FL.Posted: May 17th, 2010 01:05AM
Sq Ft of Addition: 660Which Floor: 1
Number of Rooms: 1
its cheap as hell to build one here in florida a slab of 660 sq ft cost about $900 to get poured for you. total for block walls and all. 7000 at max.
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Addition Costs
Amount: $54,000.00
Posted by: Pleasanton Contractor in Pleasanton, CA.Posted: May 8th, 2010 04:05PM
Sq Ft of Addition: 168Which Floor: first
Number of Rooms: 1
You get what you pay for. Slab on grade, stucco exterior, concrete tile roof, 3 Andersen windows and 1 French door, recessed lighting, electrical, drywall, paint in and out, prefinished hardwood all for $ 320/sq ft. That cuts profit to 12% in San Francisco Bay Area. You can always find the illegal to slop it together with no permit, taxes, insurance, etc. for 1/2 the cost and then pay me in 5 years to fix it right. These guys keep me in business and are the reason for construction nightmare stories!
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Price depends on location
Amount: $0.00
Posted by: a user in Indianapolis, IN.Posted: January 21st, 2010 06:01AM
Those prices are tremendously inflated for the Midwest. You can build an entirely new 3000sq house for $225k in metro Indianapolis, and it's even cheaper when you get into the small towns. I'm sure those prices are reasonable for markets where housing prices are a lot higher, though. It just depends on your local market, and this website is smart to estimate on the high side so that people are pleasantly surprised when they go to actually get a real estimate.
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I am a contractor
Amount: $0.00
Posted by: Ilya in San Jose, CA.Posted: December 15th, 2009 09:12AM
Most of do-it-yourself projects for additions or new construction are under estimated: timeline and money way off of the reality. I'm dealing every day with people, who want to build upscale 5000-7000 sq.ft house for $140 sq.ft. or build a 100 sq.ft addition for $90 sq.ft. That is insane. However, some room additions are very simple from construction stand point, and a prices can be low for spaces without bathrooms or kitchen or walk-in closets. Or if your room addition contain only 2 new exterior walls and a new roof is just a an extension of existing gable end. For example: simplest addition project i ever build was 400 sq. ft. Family room, no plumbing, no fireplace, 2 exterior walls, 1 window and 1 sliding patio door. With my crew i built it in 6 weeks from start to final inspection and price was $44K. Compare with 950 sq.ft addition with 2 bedrooms, 2 bathrooms, kitchen and living room, using very basic finish materials - $210,000.00
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putting on a new bedroom
Amount: $30,000.00
Posted by: Jim in the Berkshires, Massachusetts in Lanesboro, MA.Posted: November 15th, 2009 12:11PM
Sq Ft of Addition: 300 to 350 square feetWhich Floor: 1st
Number of Rooms: one
Anyone know if that amount is what we would be looking at? Just curious
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External Resources:
  1.  www.bhg.com/home-improvement/remodeling/additions/siting-home-additions/
  2.  www.remodelormove.com/remodeling-and-home-improvement-articles
  3.  www.nari.org/pdf/selectremodpro.pdf
  4.  www.nari.org/search/address/
  5.  www.contractors-license.org/
  6.  search.bbb.org/
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Went in & 2 other cases came in later but had 2 be served 1st. Gave me a pain killer & never saw a doctor. Each thing they did was hurry up & wait... [more]
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Emergency Room Visit Cost
Bone graft injection
Paid: 7700.00
The dentist said I needed 7cc's of bone @ $1100 per cc. Is this a reasonable amount? This was to secure an implant the was infected... [more]
-Gala Dali
Dental Bone Graft Cost
wheel balance (front tires)
Paid: 38.00
They busted 1 of my wheel studs, didn't tell me, and replaced it with a really crappy looking lugnut. Oh, and the ride quality is worse. I paid them to do this... [more]
-Hue Janus
Wheel Balancing Cost
Deep cleaning and extractions
Paid: 90.00
When we got our 4-year baby from someone she had horrible breath and our vet recommended a deep cleaning for $175. I checked around and the SOHFGA did the same procedure for $80. So I had them do it at the same time we had her spayed... [more]
-Cocoa's Mom - Phyllis Rios
Dog Teeth Cleaning Cost