Pricing Guide: How Much Does a 20×20 Room Addition Cost?
Building a 20×20 room addition will provide the extra space one needs in a house, and it is significantly cheaper than purchasing a new home. Most homeowners can expect to spend between $42,000 to $88,000 on room additions of this size. The national average 20×20 addition costs are around $65,000. This rate breaks down to approximately $80 to $200 a square foot for an average cost of $140 a square foot.
How Much Does a 20×20 Addition Cost?
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National average cost: $65,000
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Extreme low-end: $15,000
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Typical price range: $42,000 – $88,000
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Extreme high-end: $200,000
These prices should include materials and the GM’s labor charges. Just bear in mind every choice you make with regard to construction methods and materials will increase or reduce the cost. For example, if you add a prefabricated or modular room on the first floor in place of a custom build, the job may only cost about $15,000. however, building a 20×20 second floor that has more expensive materials, multiple plumbing fixtures, and intricate electrical work will significantly increase the price to $200,000.
Cost Breakdown for a 20×20 Addition
What goes into the cost of an addition? This includes the foundation, the roof, and the walls; a new addition will have countless stages. For a job of this scale, you will need to hire a general contractor, or GC for short, who will then subcontract specialists for the likes of electrical work, plumbing, roofing, etc.
|
Element |
Approx. Cost |
|
Windows (per window) |
$193 – $845 |
|
Insulation |
$200 – $1,600 |
|
Building permits |
$250 – $850 |
|
Doors (per door) |
$393 – $2,015 |
|
Site preparation |
$400 – $800 |
|
Drywall |
$600 – $1,200 |
|
Electrical work |
$630 – $1,930 |
|
Roofing |
$800 – $8,000 |
|
Siding |
$800 – $10,800 |
|
Plumbing |
$975 – $2,900 |
|
Flooring |
$1,100 – $4,500 |
|
Interior painting |
$1,216 – $3,270 |
|
HVAC ductwork |
$1,933 – $4,768 |
|
Foundation |
$2,400 – $6,200 |
|
Design |
$2,740 – $9,460 |
|
Framing |
$2,800 – $5,300 |
If you would like to make an appointment to discuss a room addition, please contact Construction Solution at (425) 225-3305 now! We’re happy to take on projects throughout the Bellevue, WA region.