Most finished home additions cost $100 to $300 per square foot. In Columbus, the 2025 Cost vs. Value report puts a midrange bathroom addition at about $56,000 and a midrange primary suite addition at about $157,000, with upscale versions roughly double. Size, foundation, plumbing and how the roof ties in move the number most.
Those are published figures, not our quote. They give you a fair starting point for budgeting and for checking the estimates you get, ours included. Here is where the money goes and what pushes an addition toward either end.
Columbus Addition Costs, 2025
From the Remodeling and JLC Cost vs. Value report for Columbus. Resale value is what the project adds to a home’s value at sale.
| Project | Average cost | Resale value | Cost recouped |
|---|---|---|---|
| Bathroom addition, midrange | $56,384 | $26,833 | 47.6% |
| Bathroom addition, upscale | $104,045 | $40,571 | 39.0% |
| Primary suite addition, midrange | $157,176 | $58,564 | 37.3% |
| Primary suite addition, upscale | $323,563 | $73,167 | 22.6% |
Typical Ranges by Size and Type
National figures from Fixr, updated February 2025. Central Ohio usually lands within these ranges.
| Addition | Typical range |
|---|---|
| Finished addition, per square foot | $100–$300 |
| 200 sq ft room | $20,000–$60,000 |
| Bedroom addition | $30,000–$100,000 |
| Bathroom addition | $18,000–$70,000 |
| Second story | $100,000–$300,000 |
| Design and drawings | 10–17% of project cost |
What Pushes the Price Up
Two additions the same size can be tens of thousands apart. These are the line items that move it.
Is an Addition Worth It?
Not on resale alone. In Columbus, a midrange bathroom addition recoups a little under half its cost at sale, and a primary suite a little over a third. Additions pay off in how you live in the house: room for a parent, a bedroom for a growing family, or a primary suite instead of a move.
If you are weighing an addition against moving, compare the addition cost with the full cost of selling, buying and moving, not just the price difference between houses.
How We Price an Addition
- We walk the site and look at property lines, setbacks, the foundation and the roofline
- We confirm who issues your permits and whether septic or design review applies
- You get a written line-item estimate, so you can see where the money goes and what to phase
- Permits, drawings and inspections are listed in the estimate, not added later
Questions, Answered
How much does a home addition cost in Columbus, Ohio?
The 2025 Cost vs. Value report lists a midrange bathroom addition in Columbus at $56,384 and a midrange primary suite addition at $157,176. Upscale versions run $104,045 and $323,563. A simple room without plumbing usually costs less per square foot than either.
How much does a 200 square foot addition cost?
Roughly $20,000 to $60,000 for a finished room, based on national ranges of $100 to $300 per square foot. A 200 square foot addition with a bathroom will land toward the top of that range or above it.
Is it cheaper to build up or out?
Building out is usually cheaper per square foot, because a second story means reinforcing what is already there and reworking the roof. Building up makes sense when the lot is small or setbacks leave no room to expand outward.
Does a home addition need a permit in Ohio?
Yes. Additions need zoning approval nearly everywhere and a building permit wherever a building department reviews houses. Who issues them depends on your address.
How much does it cost to add a bathroom to a house?
In Columbus, the 2025 Cost vs. Value report puts a midrange bathroom addition at about $56,000 and an upscale one at about $104,000. Adding a bathroom inside existing space costs less because there is no foundation or roof to build.
Want a real number for your addition?
See how we build them, with real project photos and reviews, on our Home Additions page, or request a free written estimate.