Shawnee County, KS Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Rear yard coverage cap
- 30% of rear yard area
- Small-parcel area cap
- 1,200 sq ft under 1 acre
- Large-parcel area cap
- 6,000 sq ft over 10 acres
- Max sidewall height
- 16 feet
- Exception authority
- Board of Zoning Appeals, Art. XXXIV
Summary
Shawnee County limits detached accessory buildings to 30 percent of the rear yard area and applies parcel-size-based square footage caps, with a Board of Zoning Appeals exception process for larger structures, under Sec. 29.03 of the Zoning Regulations.
Maximum rear yard coverage. Accessory buildings shall not occupy more than 30 percent of the rear yard area. Maximum height. Buildings and structures accessory to a residential use shall be subject to a height limit based on a gable roof design with a roof pitch not exceeding 6/12... No portion of an accessory building or structure can exceed a total building height based on the following formula where SW = span width, SH = sidewall height, and, TBH = total building height: (SW / 2) x 6 + SH = TBH, 12
Full Breakdown
Sec. ' That cap works together with the cumulative building-area table in Sec. 5% of lot area on parcels between three and ten acres, and 6,000 square feet on parcels larger than ten acres, provided no single structure exceeds 6,000 square feet. Every accessory building under this cap is also limited to a 16-foot sidewall height, with total building height further capped by the gable-roof formula in Sec. 03(a)(8): (span width / 2) x 6 / 12, plus sidewall height. 5 rounds up to the next whole number.
The regulations carve out exceptions for two situations. First, agricultural buildings used only for farming purposes such as barns, silos, bins and machinery sheds are not counted as accessory buildings at all and instead must meet the district's principal-building yard requirements (Sec. 03(a)(1)). Second, the Board of Zoning Appeals may authorize a larger cumulative building area or greater height under Article XXXIV if the applicant demonstrates the additional accessory space is compatible with the neighborhood in design, location and size, and proportional to the principal building, parcel and street frontage (Sec.
03(a)(4)b). Existing accessory buildings that already exceed today's caps are grandfathered under Sec. 03(a)(4)c and can be rebuilt after destruction by fire, explosion, act of God, or public enemy if the original building complied with the rules in force when built, subject to any variance previously granted and to current yard setbacks unless a new variance is obtained. R. Resolution 2008-3, Sec. R. Resolution 2009-3, effective November 5, 2009.
Violations & Fines
The Shawnee County zoning administrator enforces the coverage and size limits under the general enforcement duty in Sec. 1.11 of the Zoning Regulations, directing noncompliant accessory structures to be brought into conformance or removed through proper legal channels. A landowner seeking to exceed the 30 percent rear-yard limit or the parcel-size area table must apply for an exception to the Board of Zoning Appeals under Article XXXIV and show compatibility with the surrounding neighborhood and proportionality to the principal structure.
Frequently Asked Questions
What percentage of my rear yard can accessory buildings cover in Shawnee County?
Do barns and farm sheds count toward the accessory building limits?
Can I build more coverage than the code allows?
Sources & Official References
Other rules in Shawnee County
Compare Shawnee County to another location·View the Kansas building setbacks & zoning overview
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