Cost guide
Two basements of the same size can land far apart in price. Water, bathrooms, egress windows, and finishes make most of the difference. This page gives you a starting point before anyone comes out to measure. Every number here is an estimate, not a quote.
Two national averages: about $22,900 and $32,000
There's no reliable published average for basement finishing in Sioux Falls, so this page starts from national cost guides (checked October 2026). One puts the average basement remodel at about $22,900, based on more than 7,000 projects. Another puts the average cost to finish a basement at about $32,000.
Those are national figures. They mix small rec rooms with full basements that have a bathroom and a bedroom. Local prices can run above or below them, and they can't tell you what your basement will cost.
Online guides also quote anywhere from $7 to $75 a square foot for basement work. That spread is too wide to price from, so we price from a measured plan.
| Service | What the estimate covers | Estimated range |
|---|---|---|
| Full basement finishing | Unfinished basement to finished living space, about 700 to 2,000 sq ft, standard finishes | $17,000 to $34,000 |
| Basement remodeling | Reworking an already-finished basement | $12,000 to $35,000 |
| Egress window | One window: dig the well, cut the foundation, install the window and well | $3,000 to $6,400 (Sioux Falls reported range) |
| Basement bathroom | A new bathroom in the basement | $6,600 to $16,500 |
| Home theater | Theater room build-out, with equipment | $10,000 to $60,000 |
Larger basements and high-end finishes can run well past these ranges. One national guide's typical range for finishing goes up to $75,000.
The egress window range comes from published Sioux Falls data, and national guides show a similar spread. Everything else is a national estimate. Your written quote is the real number.
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What pushes a price up
- Water problems that need a sump pump, drainage, or waterproofing first. National guides put sump pump installation at about $600 to $1,600.
- A high radon test. South Dakota's Department of Agriculture and Natural Resources lists an average of about $1,200 to install a mitigation system.
- A bathroom, especially one that needs an ejector pump or a long trench to the drain line
- Each new bedroom, since each one needs an egress window
- Low ceilings, beams, or ductwork that have to be boxed in or moved
- Tearing out an old finish before building new
- High-end flooring, tile, lighting, and trim
- Permit fees, which each city sets
What brings a price down
- A dry basement with sound walls and floor
- A simple, open layout with few new walls
- Drain stubs already in the floor for a bathroom
- Standard finishes, like carpet or vinyl plank and a drywall ceiling
- Doing the egress window, bathroom, and finish as one job instead of three
The fastest way to a real number is a look at the space. Send the form or call (605) 250-3470 for a free quote. We'll measure, check for water, and give you a written price.
Get a free quote
Tell us what you want to do with your basement and which town you're in. We'll call to set up a free on-site quote.