Looking for a basement contractor in Thief River Falls, MN? Describe your project once and up to five basement contractors who work in Thief River Falls and Pennington County get back to you with a quote. It's free and there is no obligation.
Thief River Falls is home to about 8,779 people (2024 Census Bureau estimate), a stable community (−1.0% since 2020). With 1,462 people per sq mi, it is a suburban area. Full basements are common here and often the cheapest way to add living space.
Thief River Falls at a glance
- Population (Census Bureau estimate, 2024)
- 8,779 (−1.0% since 2020)
- Rank in Minnesota
- 113th of 855 cities and towns
- Land area
- 6.0 sq mi
- Population density
- 1,462 people per sq mi (suburban)
- Type
- City (Thief River Falls city)
- Main county
- Pennington County
What to check before hiring in Thief River Falls
- Moisture first: waterproof before finishing.
- Egress: in Minnesota, a basement bedroom needs an escape opening.
- Radon: test before you finish.
- Price drivers: size, bathroom, ceiling height, finishes and egress.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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EPA: radon
Official information and guidance.
Services available in Thief River Falls
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Basement finishing
Framing, insulation, electrical, drywall and flooring of a basement, with permit.
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Basement bathroom or rental unit
Bathroom, kitchenette or legal basement unit with egress and plumbing.
Frequently asked questions in Thief River Falls
How much does basement finishing cost in Thief River Falls, MN?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Thief River Falls reply with a quote.
How long does it take?
Often several weeks.
Can I rent it out?
Only if local rules allow an accessory unit; check zoning.
Which basement contractors will contact me?
Up to five independent basement contractors who serve Thief River Falls and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.