Building Setbacks & Zoning in Janesville, WI (2026)
3 verified building setbacks & zoning rules for Janesville, Wisconsin, sourced directly from the municipal code and official government pages.
Verified from official government sources
Setback Rules
In the City of Janesville, the R1 Single-Family and Two-Family Residence District requires a 25-foot front yard, an eight-foot side yard, and a 25-foot rear yard for every principal building, with a 25-foot corner side yard on corner lots. Accessory structures need only two feet plus the roof eave on the side and rear lines. The Building Division enforces these minimums through the building permit process.
Janesville R1 Front, Side and Rear Setbacks
Some RestrictionsJanesville Code of General Ordinances § 42-440(b)(1)e-f
e.Minimum setback requirements for principal use.1.Front yard: 25 feet;2.Side yard: Eight feet;3.Rear yard: 25 feet (except corner lots);4.Corner side yard: 25 feet from all street lines;5.Corner interior, side yard: side yard shall be eight feet, provided rear yard is 15 feet, or 15 feet, provided rear yard is eight feet.f.Minimum setback requirements for accessory structures.1.Front yard: as ...
Structure Height Limits
In the City of Janesville, a principal building in the R1 Single-Family and Two-Family Residence District cannot rise above two and one-half stories or 30 feet, whichever is greater. The same cap repeats in the R1D, R2 and R3M Districts. The Building Division enforces the limit when it reviews building permit plans.
Janesville R1 Maximum Building Height Limit
Some RestrictionsJanesville Code of General Ordinances § 42-440(b)(1)i
i.Maximum building height. Two and one-half stories or 30 feet, whichever is greater;
Lot Coverage Limits
In the City of Janesville, the R1 Single-Family and Two-Family Residence District requires 25 percent of a lot's gross area kept as unpaved green area and 40 percent left as open space under Code § 42-440(a)(2) and (b)(1)g-h, limiting how much of a residential lot can be covered.
Janesville Green Area and Open Space Minimums
Some RestrictionsJanesville Code of General Ordinances § 42-440(a)(2), (b)(1)g, (b)(1)h
(2)Green area. ... Green area shall be permanently provided and properly maintained on each lot devoted to any permitted or conditional use as set forth in each residential zoning district. This area shall be unobstructed to the sky and shall not be devoted to service driveways, walks, off-street parking spaces, loading berths, or other similar uses, but shall be usable for greenery, recreation...
Looking for Rock County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Janesville city rules.
Building Setbacks & Zoning in Rock County →