Looking for a basement contractor in Belvidere, IL? Describe your project once and up to three basement contractors who work in Belvidere and Boone County get back to you with a quote. It's free and there is no obligation.
Belvidere is home to about 25,325 people (2024 Census Bureau estimate), a stable community (−0.0% since 2020). With 2,000 people per sq mi, it is a suburban area. Full basements are common here and often the cheapest way to add living space.
Belvidere at a glance
- Population (Census Bureau estimate, 2024)
- 25,325 (−0.0% since 2020)
- Rank in Illinois
- 88th of 1,294 cities and towns
- Land area
- 13 sq mi
- Population density
- 2,000 people per sq mi (suburban)
- Type
- City (Belvidere city)
- Main county
- Boone County
What to check before hiring in Belvidere
- 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 Belvidere
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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 Belvidere
How much does basement finishing cost in Belvidere, IL?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Belvidere 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 Belvidere 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.