Bolthole Index

Thomas County, Kansas

Zoning, building permits and septic rules in Colby, Kansas

Colby is a city in Thomas County, Kansas. Colby adopts its own zoning, so inside its limits Colby’s rules apply, not the county’s. 5 rules below are quoted from official sources and independently re-checked, most recently on November 11, 2026. Rules for unincorporated land are on the Thomas County page.

Answers from the rulebook for Colby

Colby’s own rules

  • Local zoningPresent

    Land inside Colby city limits

    • Amended by later ordinances (e.g., 1616, 1654, 1668, 1675, 1676, 1691); current text not fully checked.
    “except as hereinafter provided, no building shall hereafter be erected or structurally altered, nor shall any building or premise be used for any purpose not conforming with the regulations herein prescribed by the zoning districts in which such building or premise a”
  • Zoning districtsPublished

    Zoning districts inside Colby city

    • Boundaries are shown on the zoning district map kept in the city clerk's office.

    districts: R-1, R-2, R-3, R-2 MH, PUD, C-1 downtown, C-1 commercial, C-2, C-M, C-3, I-1

    “r-1 single family dwelling district r-2 two family dwelling district r-3 multiple family dwelling district r-2 mh mobile home district p.u.d. planned unit development district c-1 downtown business district c-1 commercial district c-2 neighborhood commercial district c-m commercial/mixed use district c-3 heavy commercial district i-1 light industrial district”
  • Minimum lot sizeSpecified

    R-1 single family dwelling district, Colby city

    • Area between Range and Cleveland Avenue is excepted from R-1 area requirements; minimum lot width there is 50 feet.
    • Ordinance 1668 amended 21-103 later; not checked.

    minimum lot area: >= 6250 square feet (Range/Cleveland blocks)

    “intensity of use: every lot shall have an area of not less than six thousand two hundred and fifty (6,250) square feet.”
  • Building heightSpecified

    R-1 single family dwelling district, Colby city

    • Churches and educational institutions may reach 60 feet, churches and temples 75 feet, with added setback of 1 foot per foot above the limit.

    maximum height: <= 35 feet (2.5 stories) (churches/educational institutions)

    “no building shall exceed two and one-half (2½) stories or thirty-five (35) feet in height.”
  • Manufactured homesLimited

    Manufactured homes inside Colby city

    • Residential-design manufactured homes need a permanent foundation, minimum 22 body feet width, pitched roof, and conforming siding/roofing per 21-103 l.
    • Pre-June 15, 1976 or non-HUD units are deemed mobile homes; mobile homes have a separate R-2 MH district.
    • Which districts allow each type was not checked.

    minimum width: >= 22 feet

    “a residential-design manufactured home shall be considered a single-family dwelling.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Colby or Thomas County directly.

  • Building permit — Colby city
  • Owner-builder exemption — Colby city
  • Building code adopted — Colby city
  • Inspections — Colby city
  • Certificate of occupancy — Colby city
21 more unanswered
  • Minimum dwelling size
  • Setbacks
  • Lot coverage
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Shed and accessory-building permit exemption
  • Subdividing land
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees
  • Permit process

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Colby publishes no rule on the point, not that none exists. Thomas County’s page lists the county offices to call.

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