Home addition cost, Ashland 2026
What a home addition costs in Ashland in 2026
A ground-floor addition runs about $525 to $650 per square foot of new space in Ashland and southern Jackson County in 2026. A 400 square foot addition with a bathroom is most likely about $255,000, with a range of $203,000 to $305,000.
These figures come from our own additions, repriced to today’s labor, material and subcontractor costs. They are a ballpark, not a quote. Updated October 2026.
| Addition | Most likely | Range |
|---|---|---|
| 250 sq ft room, ground floor, no bathroom | $137,000 | $110,000 to $164,000 |
| 400 sq ft, ground floor, no bathroom | $209,000 | $167,000 to $250,000 |
| 400 sq ft, ground floor, one bathroom | $255,000 | $203,000 to $305,000 |
| 600 sq ft, ground floor, one bathroom | $350,000 | $280,000 to $420,000 |
| 400 sq ft, second story, one bathroom | $295,000 | $234,000 to $350,000 |
| 400 sq ft, ground floor, full kitchen | $300,000 | $241,000 to $360,000 |
Each row includes the foundation, framing, roof, windows, insulation, heat, electrical, drywall, trim, flooring and paint, with standard selections. It also includes the part of the existing house the addition opens into.
Ask what your project would cost
What drives the cost
Bathrooms and kitchens
A bathroom adds about $46,000 to a 400 square foot addition. A full kitchen adds about $91,000. Plain living space, such as a bedroom or family room, is the least per square foot.
Going up instead of out
A second story means taking off the roof, reinforcing the house below and building a stairway. The same 400 square feet with a bathroom costs about $40,000 more upstairs than on the ground.
Added features
Built-ins, wood or vaulted ceilings, special windows and millwork move the price more than anything else you choose. A 400 square foot addition with many of them is most likely about $285,000 without a bathroom, against $209,000 for a plain one.
Your selections are a small share
Premium flooring, fixtures and finishes add only about $3,000 to a plain 400 square foot addition. Most of the price is the structure and the work.
The existing house
An addition also changes part of the house it joins: a wall opened up, a floor matched, a roof tied in. We count that area in the price. In Ashland’s historic districts, an addition also goes through design review, which we handle.
Additions we’ve built
- C Street, Ashland. A 554 square foot two-story addition in the Railroad District, with a new kitchen downstairs and a bedroom, bathroom and closets upstairs. The flat roof became a gable roof over a full-length attic.
- Pinecrest Terrace, Ashland hills. A 103 square foot entry addition as part of a whole-house interior remodel. The whole job would cost about $325,000 to $540,000 to build today.
What these numbers don’t include
- Planning, which is billed hourly under its own agreement.
- Engineering and surveying, when a project needs them.
- Digging into a sloped lot, or a slab foundation.
- A new roof on the existing house.
- Decks and porches.
- Asbestos or lead removal in the existing house, if a test finds it.
Permit fees are included.
How we get to your number
- Ben meets you at your house. The first meeting is complimentary.
- We send a written description of the project and a cost range, at no charge.
- If the range fits what you want to invest, we start planning under an hourly planning agreement. Ben draws the building plans, and planning ends with your selections and a firm, fixed price.
Talk with us
Fill out the contact form; we get it right away and respond within a day. You can also call the office at 541-300-8118, Monday to Friday, 7 am to 3:30 pm, or email office@benthebuilderinc.com.