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Beloit in short
- 14,531
- housing units in Beloit
- 55.4%
- built before 1960 (county 37.1%)
- 22.5%
- built 1960 to 1979 (county 27.7%)
- 1957
- median year built (county 1970)
The local numbers
How old the wiring is likely to be in Beloit
Beloit has 14,531 housing units, and 3,915 of them (26.9%) were built in 1939 or earlier (Rock County: 19.2%). Knob-and-tube wiring was in common use from about 1880 into the 1940s, so those are the houses where it can still turn up behind plaster or in the attic. That is the highest share of pre-1940 homes of the 5 cities on this site.
3,270 homes in Beloit (22.5%) were built from 1960 through 1979, fewer than the county's 27.7%. The CPSC says cable installed from 1965 to the mid 1970s may have aluminum branch wiring, so in that slice of the housing it is worth a look at the cable markings before adding outlets or a bigger panel (aluminum wiring). It ranks 3rd of 5 here.
Half of Beloit's homes were built before 1957 (county 1970), and 55.4% went up before 1960. Houses that old were wired for far less than a kitchen, a heat pump and an electric car now draw, which is why a service upgrade comes up so often here. That is the highest share of pre-1960 homes of the 5 cities on this site.
Wiring eras: InterNACHI on knob-and-tube; U.S. CPSC on aluminum wiring.
Beloit housing and households vs Rock County
| Measure | Beloit | Rock County |
|---|---|---|
| Residents | 36,534 | 164,350 |
| Housing units | 14,531 | 71,109 |
| Occupied (households) | 13,638 | 67,201 |
| Owner-occupied households | 8,105 (59.4%) | 47,819 (71.2%) |
| Renter households | 5,533 (40.6%) | 19,382 (28.8%) |
| Single-family detached | 72.8% | 74.4% |
| Median year built | 1957 | 1970 |
| Built 1939 or earlier | 3,915 (26.9%) | 13,653 (19.2%) |
| Built before 1960 | 8,053 (55.4%) | 26,379 (37.1%) |
| Built 1960 to 1979 | 3,270 (22.5%) | 19,718 (27.7%) |
| Built 2000 or later | 11.3% | 16.3% |
| Mobile homes | 0.5% | 2.6% |
| In buildings of 5+ units | 13.9% | 11.7% |
Source: U.S. Census Bureau, ACS 2024 5-year (2020-2024), tables B01003, B25003, B25024, B25034 and B25035.
Local rules
Electrical permits and power in Beloit
We could not confirm on a city or utility page which power company serves every Beloit address, so ask when you call about a service upgrade.
- Permits and inspection
- Beloit's Planning and Building Services division requires a permit before construction, alteration, repair or improvement of any building, and the city's own building inspectors review plans for one- and two-family projects. source
- Permit fees
- Beloit's 2026 master fee schedule (electrical work fees, city code 10.04) charges a $50 filing fee on every permit application, doubled if work starts before approval. On top of that: $15 for a 100-amp service and $10 for each additional service from 100 to 1,000 amps, $0.75 per switch, receptacle or light fixture, $5 for each 240-volt outlet, GFCI or arc-fault device, $4 for a range or dryer circuit, $0.25 per kilowatt for a generator, $35 for an in-ground pool, hot tub or spa, and $15 for a re-inspection. source
Where Beloit publishes less, the state rules still apply everywhere in Wisconsin: electrical work has to be done by a licensed electrician unless you own and live in the house, and a new service, feeder or branch circuit needs a permit before work starts. How that plays out in Janesville is in the Janesville permit guide, and what a homeowner may do alone is in can you do your own electrical work.
About Beloit. Beloit sits on the Rock River at the Illinois state line; its 2020 census population was 36,657. Wikipedia
ZIP codes. 53511. Census 2020
Full pricing, the complete service menu, and the rest of the service area are on the electrician in Janesville, WI homepage.
Common questions
Beloit electrician questions
Who issues electrical permits in Beloit?
Beloit's Planning and Building Services division requires a permit before construction, alteration, repair or improvement of any building, and the city's own building inspectors review plans for one- and two-family projects.
How much is an electrical permit in Beloit?
Beloit's 2026 master fee schedule (electrical work fees, city code 10.04) charges a $50 filing fee on every permit application, doubled if work starts before approval. On top of that: $15 for a 100-amp service and $10 for each additional service from 100 to 1,000 amps, $0.75 per switch, receptacle or light fixture, $5 for each 240-volt outlet, GFCI or arc-fault device, $4 for a range or dryer circuit, $0.25 per kilowatt for a generator, $35 for an in-ground pool, hot tub or spa, and $15 for a re-inspection.
How old are the houses in Beloit?
Per the ACS 2020-2024 5-year estimates, 3,915 of 14,531 housing units in Beloit were built in 1939 or earlier and 55.4% before 1960, against 37.1% for Rock County. The median year built is 1957.
What does a panel upgrade cost in Beloit?
No local electrician publishes prices, so the best guide is Wisconsin data: about $1,500 to $4,500 for a 200-amp upgrade, with older houses and aluminum wiring at the high end. Every range is on the cost page.
Electrical work coming up in Beloit?
Tell us the address and the job. A licensed electrician who works in Beloit replies with a price, and nothing starts until you agree to it.