A finished home addition in the Augusta area typically costs $125 to $250+ per square foot. A 400-square-foot bedroom and bath addition usually lands between $50,000 and $100,000, depending on finishes and site conditions.
Augusta figures run from $124 per square foot for standard construction to $247 for premium work (HomeBlue). Here's what that looks like by size:
| Addition size | Square feet | Standard finish | Premium finish |
|---|---|---|---|
| 12 × 12 | 144 | $18,000 | $36,000 |
| 20 × 20 | 400 | $49,000 | $99,000 |
| 20 × 30 | 600 | $74,000 | $148,000 |
| 25 × 40 | 1,000 | $124,000 | $247,000 |
The type of room matters as much as the size. Kitchens and bathrooms cost the most per square foot because of plumbing, cabinets and tile. Bedrooms, family rooms and garage conversions cost the least. Georgia guides put kitchen extensions at $240 to $430 per square foot and bedroom or family room additions at $140 to $260 (Home Addition Cost Calculator).
What drives the price
- Foundation and site work. Red clay, slopes and drainage can add cost before the walls go up. Crawlspace and slab foundations are priced differently.
- Tying into the house. Matching the roofline, brick or siding and opening up an existing wall takes careful work.
- HVAC. Your current system may not handle the extra space. Some additions need a new unit or a mini-split.
- Plumbing. Adding a bathroom or kitchen means new supply and drain lines.
- Porches and decks. These are priced separately from heated living space, so ask for them as their own line.
- Permits and plans. Additions need a building permit, and many need drawings or an engineer's stamp. Plan review can take 2 to 4 weeks.
How to plan a smart addition
- Decide early what the room is for. A bathroom or kitchen changes the budget a lot.
- Check your lot for setbacks and easements before you design.
- Budget 10% contingency for site surprises and tie-in work.
- Hire a licensed general contractor who pulls the permits in their own name.
Plan your addition with 10th Avenue Designs
We design and build additions, sunrooms and garage conversions across North Augusta, Augusta, Evans and Martinez. Call (706) 445-4023 or book a meeting to talk through your space.
Planning a project in the CSRA?
Tell us what you have in mind and we will help you take the next step with clarity and a clear quote.