Olathe, KS Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- ADU lot coverage cap
- 75% max, house + ADU
- Standard districts
- No blanket coverage cap
- Lot coverage counts
- Structures, parking, private streets
- Excluded
- Pools, courts, sidewalks, plazas
Summary
Olathe doesn't set a blanket lot-coverage percentage for standard residential lots, but adding an accessory dwelling unit caps total lot coverage, house plus ADU, at 75 percent.
The ADU must not cause lot coverage to exceed seventy-five (75) percent, including the principal structures.
8. The ADU must meet current building code requirements.
9. The ADU must obtain a separate address to help guarantee emergency response.
10. The ADU must provide one (1) off-street parking space with access to a public street from the existing driveway. This space may be located in the existing driveway for the principal structure.
D. Process
1. An ADU requires a building permit only and a separate administrative review is not required.
2. Exceptions to the size, location, and architectural style requirements of this section may be approved by the Planning Official.
3. An applicant aggrieved by a final decision of the Planning Official may appeal to the Board of Zoning Appeals (see Section 18.40.220). (Ord. 22-22 § 12, 2022)
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 26-39, passed July 21, 2026).
Full Breakdown
Olathe's R-1 and other residential dimensional-standards tables regulate lot area, width, yards and open space, but don't set a general maximum lot-coverage percentage. The one hard lot-coverage number in the UDO applies specifically when a property adds an accessory dwelling unit: Section 18.50.025.C.7 caps combined coverage from the principal structure and the ADU at 75 percent of the lot. The UDO defines lot coverage, at Section 18.90, as the ground-floor footprint of structures, parking lots and private streets/drives, pools, tennis courts, sidewalks and plazas don't count.
Violations & Fines
An ADU project that pushes combined lot coverage past 75 percent can't get a building permit until the site plan is revised to bring coverage back under the cap.
Frequently Asked Questions
Is there a maximum lot coverage percentage in Olathe?
What counts as lot coverage under Olathe's UDO?
Sources & Official References
Other rules in Olathe
Compare Olathe to another location·View the Kansas building setbacks & zoning overview
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Lot Coverage Limits in Nearby Cities
How other cities in Johnson County handle lot coverage limits.