Looking for an addition contractor in Round Lake, IL? Describe your project once and up to three addition contractors who work in Round Lake and Lake County get back to you with a quote. It's free and there is no obligation.
Round Lake is home to about 18,654 people (2024 Census Bureau estimate), a stable community (−0.4% since 2020). With 3,355 people per sq mi, it is a suburban area. Growing families here often add space instead of moving.
Round Lake at a glance
- Population (Census Bureau estimate, 2024)
- 18,654 (−0.4% since 2020)
- Rank in Illinois
- 133rd of 1,294 cities and towns
- Land area
- 5.6 sq mi
- Population density
- 3,355 people per sq mi (suburban)
- Type
- Village (Round Lake village)
- Main county
- Lake County
What to check before hiring in Round Lake
- Zoning: check Round Lake's setbacks, lot coverage and height limits first.
- License and permit: in Illinois, additions are built by licensed contractors under a permit.
- Structure: second stories need an engineer to check the existing house.
- Price drivers: size, foundation, roof tie-in, plumbing and finishes.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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NAHB
Official information and guidance.
Services available in Round Lake
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Room addition
Ground-floor addition with foundation, framing, roof and finishes.
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Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Round Lake
How much does an addition cost in Round Lake, IL?
It depends on size, foundation and finishes. Describe your project: contractors who serve Round Lake reply with a quote.
How long does it take?
Often a few months, plus design and permits.
Does an addition raise property taxes?
Usually, since it increases the assessed value.
Which addition contractors will contact me?
Up to three independent addition contractors who serve Round Lake 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.