Looking for a basement contractor in Henderson, IL? Describe your project once and up to three basement contractors who work in Henderson and Knox County get back to you with a quote. It's free and there is no obligation.
Henderson is home to about 257 people (2024 Census Bureau estimate), a shrinking community (−2.3% since 2020). With 969 people per sq mi, it is a semi-rural area. Full basements are common here and often the cheapest way to add living space.
Henderson at a glance
- Population (Census Bureau estimate, 2024)
- 257 (−2.3% since 2020)
- Rank in Illinois
- 1,050th of 1,294 cities and towns
- Land area
- 0.3 sq mi
- Population density
- 969 people per sq mi (semi-rural)
- Type
- Village (Henderson village)
- Main county
- Knox County
What to check before hiring in Henderson
- Moisture first: waterproof before finishing.
- Egress: in Illinois, 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 Henderson
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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 Henderson
How much does basement finishing cost in Henderson, IL?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Henderson 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 three independent basement contractors who serve Henderson 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.