Looking for a basement contractor in Olathe, KS? Describe your project once and up to five basement contractors who work in Olathe and Johnson County get back to you with a quote. It's free and there is no obligation.
Olathe is home to about 149,035 people (2024 Census Bureau estimate), a growing community (+5.5% since 2020). With 2,314 people per sq mi, it is a suburban area. Full basements are common here and often the cheapest way to add living space.
Olathe at a glance
- Population (Census Bureau estimate, 2024)
- 149,035 (+5.5% since 2020)
- Rank in Kansas
- 4th of 625 cities and towns
- Land area
- 64 sq mi
- Population density
- 2,314 people per sq mi (suburban)
- Type
- City (Olathe city)
- Main county
- Johnson County
What to check before hiring in Olathe
- Moisture first: waterproof before finishing.
- Egress: in Kansas, 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 Olathe
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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 Olathe
How much does basement finishing cost in Olathe, KS?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Olathe 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 Olathe 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.