How much does a contractor charge for room additions?
Mar 31, 2026
Here are the most common charges for the average room addition:
| Bedroom Addition | $250 – $400 Per SF |
| Bathroom Addition | $300 – $550 Per SF |
| Kitchen Expansion | $350 – $600 Per SF |
| Second-Story Addition | $450 – $850 Per SF |
There are many factors that can affect the costs of a room addition:
- Is it a second-story room addition or on the first floor?
- Is it a hillside property or on a flat lot?
- Is this a fire zone area? Coastal?
- How easy is access to the work zone?
- Is the home addition project involving a new kitchen, bathroom, or just open space?
- What is the overall quality requested or anticipated for the addition project?