Basement Finishing in South Beloit, IL
Updated
South Beloit in short
- 3,339
- households in South Beloit
- 1991
- median year built (county 1971)
- 40.9%
- of homes built before 1980 (county 63.4%)
- 69%
- own their home (county 65.9%)
The local numbers
How old the homes are in South Beloit
South Beloit skews newer than Winnebago County as a whole. 31.2% of its 3,559 homes were built in 2000 or later, against 13.6% county-wide, for a median year built of 1991. Only 40.9% predate 1980 (county: 63.4%), so the permit and code rules below matter more here than the age of the foundation.
Owner-occupied homes make up 69% of South Beloit's 3,339 households. The county figure is 65.9%. 70.5% of housing units are single-family detached houses (county: 70.4%), and 14.8% are in buildings of five or more units.
For a building permit in South Beloit, the office is the Winnebago County Building Division. It is at 404 Elm Street, Room 403, Rockford, (815) 319-4350. Its posted schedule values a finished basement at a set rate per square foot and charges a processing fee per trade; the schedule is undated, so confirm any dollar figure with the office. The county's codes page lists the 2015 International Residential Code, so confirm the edition with the Building Division.
Radon belongs on the checklist. IEMA says to retest if renovations or additions are made, and that homes with elevated levels have been found throughout the state. In South Beloit, with 3,559 homes, that includes a basement you have just closed in with drywall.
South Beloit housing and households vs Winnebago County
| Measure | South Beloit | Winnebago County |
|---|---|---|
| Residents | 7,946 | 283,292 |
| Housing units | 3,559 | 125,002 |
| Occupied (households) | 3,339 | 116,014 |
| Owner-occupied households | 2,304 (69%) | 76,408 (65.9%) |
| Renter households | 1,035 (31%) | 39,606 (34.1%) |
| Median year built | 1991 | 1971 |
| Built before 1940 | 13.4% | 15.5% |
| Built before 1960 | 23.4% | 35.5% |
| Built before 1980 | 40.9% | 63.4% |
| Built 2000 or later | 31.2% | 13.6% |
| Single-family detached | 70.5% | 70.4% |
| Mobile homes | 7.2% | 1.3% |
| In buildings of 5+ units | 14.8% | 11.4% |
Source: U.S. Census Bureau, ACS 2024 5-year (2020-2024), tables B01003, B25003, B25024, B25034, B25035 and B25038.
Local rules
Permits, codes and egress in South Beloit
- Permit office
- The City of South Beloit does not run its own building permit desk. Its community development page links the Winnebago County Building Permit application, and a city site development permit form refers to a building permit that "has been issued by the County of Winnebago on behalf of the City of South Beloit." The county application goes to the Building Department, 404 Elm Street, Room 403, Rockford, (815) 319-4350. The city's community development page lists zoning permit applications, and whether an interior basement finish needs one is not stated, so ask the city. source 1 source 2 source 3
- Permit fee
- City code Sec. 14-58 says "The permits and fees established by the county relating to the building code, and as such permits and fees may be amended from time to time by the county, are hereby adopted by reference." So the county's schedule applies: Interior Remodel and Finished Basement are valued at $60.00 per square foot, the processing fee is $40.00 per trade, and an egress window permit on an existing structure is $30.00 each plus the $40.00 processing fee. The county PDF is undated, so confirm with the Building Division before relying on a dollar figure. source 1 source 2
- Code edition
- The city's building chapter adopts the Winnebago County Building Code by reference, including later county amendments (the section text was only partly retrievable), so the county's codes list applies: its codes page (last modified February 20, 2025) lists the 2015 International Residential Code. That looks old next to the statewide baseline that began January 1, 2025, so confirm the edition with the Building Division. source 1 source 2
- Contractor rules
- The city's building chapter has a section (14-59) headed "Registered contractor require..."; the text was cut off in the copy we could retrieve, so ask the city what registration it requires before hiring. Illinois itself does not license general contractors. source 1 source 2
- Also worth knowing
- The Winnebago County Health Department sells radon test kits (call 815-720-4100; the price includes return postage and certified lab analysis) and says kits are also sold at many local hardware and building stores. It also verifies that proposed additions, garages, pools and decks will not adversely affect an existing well or septic system. We found no Health Department rule specific to finishing a basement. source 1 source 2
About South Beloit. South Beloit is a city on the Illinois-Wisconsin border, a suburban extension of Beloit, Wisconsin, with 7,989 residents at the 2020 census. Wikipedia
ZIP codes. 61080 (93% of its land), 61073 (6% of its land), 61072 (1% of its land). Census 2020
Full pricing, the complete service menu, and the rest of the service area are on the basement finishing in Rockford, IL homepage.
Nearby, sharing a ZIP code with South Beloit
Basement work
Basement jobs homeowners ask about in South Beloit
Common questions
South Beloit basement finishing questions
Who issues basement finishing permits in South Beloit?
The City of South Beloit does not run its own building permit desk. Its community development page links the Winnebago County Building Permit application, and a city site development permit form refers to a building permit that "has been issued by the County of Winnebago on behalf of the City of South Beloit." The county application goes to the Building Department, 404 Elm Street, Room 403, Rockford, (815) 319-4350.
What building code applies to a basement in South Beloit?
The city's building chapter adopts the Winnebago County Building Code by reference, including later county amendments (the section text was only partly retrievable), so the county's codes list applies: its codes page (last modified February 20, 2025) lists the 2015 International Residential Code. That looks old next to the statewide baseline that began January 1, 2025, so confirm the edition with the Building Division.
Does a basement bedroom in South Beloit need an egress window?
Every basement and every sleeping room needs at least one operable emergency escape and rescue opening. A finished basement bedroom needs its own. Net clear opening of at least 5.7 square feet, or 5 square feet for a grade floor or below-grade opening, at least 24 inches high and 20 inches wide, with the sill no more than 44 inches above the floor. These are the model 2021 IRC numbers as reproduced by a state building agency fact sheet; a city or county amendment could change them, so confirm with the permit office.
How much is the permit fee in South Beloit?
City code Sec. 14-58 says "The permits and fees established by the county relating to the building code, and as such permits and fees may be amended from time to time by the county, are hereby adopted by reference." So the county's schedule applies: Interior Remodel and Finished Basement are valued at $60.00 per square foot, the processing fee is $40.00 per trade, and an egress window permit on an existing structure is $30.00 each plus the $40.00 processing fee. The county PDF is undated, so confirm with the Building Division before relying on a dollar figure. The permit fee is separate from the build cost; see the cost page for what finishing itself runs.
How old are the homes in South Beloit?
Per the ACS 2020-2024 5-year estimates, the median home in South Beloit was built in 1991 (Winnebago County: 1971). 13.4% of its 3,559 homes were built before 1940 and 40.9% before 1980, against 63.4% county-wide.
What does finishing a basement cost in South Beloit?
No cost guide publishes a Rockford figure. HomeGuide's national guide puts a finish at $30 to $50 per sq ft, Angi's Chicago page $55 to $145 per sq ft, and Angi's national average is $32,000. The full price table shows each source and its date.
Do basement contractors have to be licensed or registered in South Beloit?
The city's building chapter has a section (14-59) headed "Registered contractor require..."; the text was cut off in the copy we could retrieve, so ask the city what registration it requires before hiring. Illinois itself does not license general contractors.
Planning a basement finish in South Beloit?
Tell us the address, the rough basement size and what you want down there. We reply with a price before any work is scheduled.