New Space Addition Cost

How much does it cost to add a new space?

Adding on to any home, whether it is an expansion of the existing "footprint" or an entirely new level is a very complex project. For this discussion we will examine the requirements and general costs associated with adding a single-story 192 square foot (12'x16') room. This type of project will not be considered a "DIY" project in the least, and several contractors will be necessary for the job (carpentry, installation, electrical, etc.).

For the new addition such as described above, the typical costs include:

  • According to Hanley Wood and their "Remodeling" magazine the average basic addition in which a foundation is added, vinyl 1 siding is applied, adequate roofing is done, interior walls are insulated and finished, new carpet and windows are installed and all electrical and HVAC works is completed will cost $23,804. The resale value of this update would hold at $19,757, or an 83% return on investment.
  • The above figures place the cost of the addition at $124 per square foot. This pricing structure assumes that carpenters charge an average of $70 per hour, electricians between $65 to $85 per hour, and painters between $20 and $35 per hour.

Cost breakdown

What needs to be included:

  • Architectural design services to ensure that new addition is housed in a structure in a style appropriate to the existing house, and up to code for the neighborhood or area in which the home is located. This should require no more than 10 - 17% of the total building budget;
  • Arrange any required demolition, excavation, or site preparation - Average costs are going to vary according to the level of work necessary;
  • Pour concrete footings 2 and slab if no crawlspace foundation exists - Average price of concrete is $75 per cubic yard, with piers and the full slab it that would require roughly 14 cubic yards and would cost at least $1050;
  • Build roof trusses 3 and support beam system and tie into existing structure - lumber prices will vary as will the design used by the carpenters constructing the new space. The project should require 2x4 wood framing along with OSB structural sheathing;
  • Asphalt 4 shingles 5 with galvanized metal flashing 6 - Average of $80 to $100 per square of 50-year shingles 5. Total cost of $450, plus installation time of at least 16 hours;
  • Install vinyl 1 siding and trim - Average price of $7 per square foot installed, and for the 514 square feet needed, this would total $3600;
  • Finish ceilings and walls - Drywall 7 throughout would require 20 panels of 4'x8' for walls and ceiling at $9.80 each (plus screws, nails and finishing compound) for an approximate total of $250 plus approximately 24 hours of installation;
  • Fiberglass 8 wall and attic insulation with R-49 and R-28 values respectively value will cost an overall average of $2.00 per square foot (installed) for an approximate total cost of $825;
  • 1 - six-panel primed hardboard door 9 - Average of $178 each plus four hours of installation;
  • Three new windows - Average price of $300-$700 per window, plus installation time of two to five hours per window. Be sure that the windows purchased will qualify for tax deductions;
  • Carpeting - Averages at $15 to $25 per square yard (with padding 10 and installation) totals $533;
  • New moldings - Average of $3.00 per foot of installed molding for a total of roughly $850;
  • Tie into existing HVAC - Average cost will vary according to pre-existing system;
  • Provide electrical wiring and lighting to code - This is going to depend upon the amount of work required, but electricians average from $65 to $85 per hour. This project might be priced on a per item basis, or the electrician might simply base it on the square footage; and
  • Provide carpentry to code - This is going to depend upon the amount of work required, but carpenters average $70 per hour. This project might be priced on a per item basis, or the carpenter might simply base it on the square footage.

Enhancement and improvement costs

  • 6 recessed ceiling lights; and
  • Painting of trim and walls.
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Remodeling Terms Cheat Sheet

Definitions in laymen's terms, cost considerations, pictures and things you need to know.
See full cheat sheet.
1 Vinyl: A synthetic plastic made from ethylene and chlorine. Vinyl has many applications in the construction industry and it is widely used in sidings, window frames, roofing and gutters, among others
2 Footings: A support for the foundation of a house that also helps prevent settling. It is typically made of concrete reinforced with rebar, but can also be made of masonry or brick. It is usually built under a heavier part of the house like a wall or column, to distribute the weight of the house over a larger area.
3 Trusses: Structural framework used to support a roof
4 Asphalt: A viscous, black mixture of hydrocarbons often used for roofing and waterproofing. It is also used in asphalt for paving roads
5 Shingles: A smooth, uniform, flat piece of construction material, available in a wide variety of materials and laid in a series of overlapping rows, used to cover the outside of roofs or walls to protect against weather damage and leaks.
6 Metal flashing: A thin sheet of metal used around the edges and junctions of the roofing material,such as around a chimney or vent, to prevent water from entering the structure through those joints
7 Drywall: Type of plasterboard, commonly used to build walls and ceilings, composed of gypsum that is layered between sheets of heavy paper
8 Fiberglass: Plastic that is reinforced with glass fibers. The fibers may be mixed randomly throughout the plastic, or come in the form of a flat sheet, or be woven into a fabric
9 Hardboard door: A door finished with a surface made of high-density fiberboard, an engineered wood product also called hardboard, and factory painted to look like wood. This term can also refer to a door with a solid hardboard core and wood veneer panels
10 Padding: A cushion placed under a carpet to absorb impact, thus extending the life of the carpet

Cost to add a new space varies greatly by region (and even by zipcode). To get free estimates from local contractors, please indicate yours.

Labor cost by city and zipcode

Compared to national average
Andover, MN
+8%
Arlington, TX
+6%
Arlington, VA
+38%
Atlanta, GA
+24%
Austin, TX
+13%
Birmingham, AL
+6%
Bluffton, SC
+1%
Boston, MA
+40%
Bronx, NY
+32%
Brooklyn, NY
+16%
Buffalo, NY
-1%
Burbank, CA
+12%
Cape Coral, FL
-9%
Carrollton, TX
+14%
Charlotte, NC
+6%
Chicago, IL
+40%
Columbus, OH
+5%
Dallas, TX
+10%
Denver, CO
+1%
Detroit, MI
+16%
Foley, AL
-11%
Fort Lauderdale, FL
+2%
Fort Worth, TX
+6%
Fremont, CA
+35%
Greensboro, NC
-9%
Greenville, SC
-12%
Houston, TX
+24%
Indianapolis, IN
+6%
Jacksonville, FL
-1%
Jamaica, NY
+35%
Knoxville, TN
+10%
Lake Worth, FL
-2%
Las Vegas, NV
+7%
Laurel, MD
+26%
Lenexa, KS
+13%
Long Beach, CA
+16%
Los Angeles, CA
+11%
Louisville, KY
-7%
Miami, FL
+1%
Minneapolis, MN
+25%
Mobile, AL
-8%
Mukilteo, WA
-14%
Nashville, TN
+21%
New Orleans, LA
+35%
New York, NY
+77%
Norwalk, CT
+46%
Oakland, CA
+36%
Oklahoma City, OK
-12%
Ontario, CA
+19%
Orlando, FL
+2%

Labor cost in your zipcode

Methodology and sources