ADU (Accessory Dwelling Unit) Cost in Columbia, SC (2026)
A ADU remodel in Columbia typically costs between $53,500 and $267,000, with most homeowners spending around $115,500. Here's the local breakdown and what drives it.
Where the money goes
Typical split of a $115,500 ADU remodel in Columbia.
What affects your Columbia price
FAQ
How much does a ADU remodel cost in Columbia?
In Columbia, South Carolina, a ADU remodel typically runs $53,500 to $267,000 in 2026, with most projects near $115,500. Local labor and material costs put Columbia at about 89% of the US average.
What's included in that price?
A detached or attached secondary unit — foundation to finishes, plus utilities and permits.
Why is Columbia different from the national average?
Construction labor rates, permit fees, and material delivery costs vary by metro. Columbia's cost index is 0.89× the US baseline, which we apply to national ADU ranges.
How do I get an exact number for my project?
Use the free Reno estimate tool — describe your project (or upload a photo) and get a line-item estimate tied to your ZIP code, then share it with vetted local contractors.
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ADU (Accessory Dwelling Unit) cost in other cities
Other remodels in Columbia
Ranges are 2026 market estimates based on national ADU costs adjusted by Columbia's local construction cost index. Your actual cost depends on scope, finishes, and contractor. Get a project-specific estimate above.