Bolthole Index

Platte County, Missouri

Building permits, zoning and septic rules in Dearborn, Missouri

Dearborn, Missouri requires a city building permit before a building is constructed, altered, moved or enlarged.1 Dearborn has its own zoning regulations; for a Platte County address, confirm whether the parcel is inside city limits before choosing the permit office.2 Private sewage systems inside Dearborn require a city inspector’s permit, and additional state or county health requirements may apply.34

At a glance

Building permits
City permit required for construction, alterations, moves and enlargement; valid for 6 months1
Zoning
Dearborn has municipal zoning regulations2
Private sewage permits
City inspector’s written permit required; state or county health requirements may also apply34
Septic lot area
Subsurface soil absorption systems need at least 15,000 square feet3
Public sewer
Connection required after official notice when the qualifying public sewer is within 100 feet of the property line5
Residential height
District 1 single-family residential: maximum 2 stories6

Who to call

Building permits

Dearborn City Hall — Building Permits

Building-permit forms and application submission at City Hall

(816) 992-3576

100 Short Street P.O. Box 86 Dearborn, MO 64439

Zoning

Dearborn Code Compliance

City code information and enforcement; contact through City Hall

(816) 992-3576

100 Short Street P.O. Box 86 Dearborn, MO 64439

Septic permits

Platte County Health Department — Environmental Health

Ask about additional county health requirements for a Dearborn private sewage system; the city inspector’s permit remains separate

(816) 858-2412

[email protected]

7925 NW 110th Street Kansas City, MO 64153

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Dearborn means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

Do you need a building permit in Dearborn, MO?

Dearborn requires the owner to obtain a building permit before erecting, constructing, altering, moving, converting, extending or enlarging a building inside city limits.1 Dearborn’s building permit must conform to the city zoning regulations and is valid for 6 months.1

Ask City Hall which forms apply to your project and how to handle work that may extend beyond the permit period. We could not confirm Dearborn’s adopted construction-code edition, general building-inspection schedule, certificate-of-occupancy requirement or owner-builder exemption; ask for those answers before setting a construction schedule.

Who issues building permits in Dearborn, and where do you apply?

Dearborn’s building-permit page directs residential and commercial applicants to call for the necessary forms, then complete the building-permit application and return it to City Hall.7 Call Dearborn City Hall at (816) 992-3576 for building-permit forms.7

Dearborn’s application must include drawings or plats showing lot lines, buildings, building locations and proposed uses; the enforcing officer may require a boundary survey, staking and complete construction plans.8 Ask City Hall for the current fee schedule and the required plan package for your particular building before ordering final drawings.

Does Dearborn have zoning, and what does it mean for your lot?

Dearborn has its own municipal zoning regulations, including district rules, conditional uses, permits and enforcement.2 Dearborn’s District 1 single-family residential height chart sets a maximum of 2 stories.6 The Dearborn Code Compliance Division provides city-code information and enforces city codes and ordinances.9

Ask Code Compliance to identify the parcel’s district and confirm its permitted uses, minimum lot area, frontage and setbacks before designing a home. We could not confirm a minimum dwelling floor area or lot-coverage percentage for Dearborn. Treat those as questions for the city, especially if a small house or unusually narrow lot is central to your purchase.

How do septic permits work inside Dearborn?

Dearborn requires a written permit signed by the city inspector before constructing a private sewage disposal system where public sewer is unavailable; the application may require plans and specifications.3 Dearborn’s code lists a $10 permit-and-inspection fee and prohibits permits for subsurface soil absorption systems on lots smaller than 15,000 square feet.3

Dearborn’s private sewage system design must follow state public-health recommendations, and state or county health officers may impose additional requirements; ask the city inspector and Platte County Health Department which approvals apply to the parcel.4 Notify Dearborn’s inspector for final inspection before covering underground portions.10

A qualifying public sewer within 100 feet of the property line triggers connection at the owner’s expense within 90 days after official notice.5 Confirm sewer availability before buying a lot specifically for septic.

Can you live in an RV or tiny home in Dearborn?

We could not confirm Dearborn’s rules for residential RV occupancy, temporary camping, tiny homes, accessory dwellings or manufactured-home occupancy. Ask Dearborn Code Compliance about the exact proposed use: permanent residence, temporary housing during construction or occasional camping. Request an answer tied to the parcel’s zoning district and the proposed structure.

Dearborn has municipal zoning, and its building-permit requirement includes buildings that are moved or converted as well as newly constructed buildings.21 Dearborn also requires city approval for private sewage systems where public sewer is unavailable, so resolve wastewater approval alongside the housing question.3

Building a home in Dearborn: what should you do first?

  1. Ask Dearborn Code Compliance to confirm the parcel’s zoning district and proposed use under the city’s zoning regulations.2
  2. Ask the city about public sewer availability; Dearborn requires connection under its qualifying sewer-distance and official-notice conditions.5
  3. Obtain City Hall’s building-permit application and prepare the required lot drawings or plats, with any survey and construction plans the enforcing officer requests.78
  4. Obtain Dearborn’s building permit before starting covered building work, and arrange the city inspector’s separate written approval if constructing private sewage disposal.13
  5. Arrange final private-sewage inspection before covering underground work.10

For land outside Dearborn city limits, use the Platte County guide: Platte County’s building regulations apply to unincorporated territory.11 Ask City Hall about floodplain administration, municipal-street driveway access and water service; we could not confirm those local requirements.

Watch-outs

  • Dearborn’s building permit lasts 6 months; ask City Hall how your construction timetable fits that validity period.1
  • Dearborn’s subsurface soil absorption permit requires at least 15,000 square feet of lot area; meeting that threshold does not replace the city’s system approval.3
  • We could not confirm RV or tiny-home residential occupancy in Dearborn; ask the city Code Compliance Division, which provides city-code information, before purchasing land for either use.9
  • Missouri requires a MoDOT right-of-way permit for constructing or modifying a driveway on MoDOT right-of-way; ask MoDOT if your Dearborn access involves a state-maintained road.12

Sources

  1. Article VIII: Permits, Plats and Filing Fees and Culverts - City of Dearborn, MO (Dearborn), quoted and re-checked
  2. Table of Contents - City of Dearborn, MO (Dearborn), quoted and re-checked
  3. Chapter 710 Public and Private Sewers - City of Dearborn, MO (Dearborn), quoted and re-checked
  4. Chapter 710 Public and Private Sewers - City of Dearborn, MO (Dearborn), quoted and re-checked
  5. Chapter 710 Public and Private Sewers - City of Dearborn, MO (Dearborn), quoted and re-checked
  6. Article IV: Height, Area and Bulk - City of Dearborn, MO (Dearborn), quoted and re-checked
  7. Dearborn City Hall — Building Permits (cityofdearbornmo.org)
  8. Article VIII: Permits, Plats and Filing Fees and Culverts - City of Dearborn, MO (Dearborn), quoted and re-checked
  9. Dearborn Code Compliance (cityofdearbornmo.org)
  10. Chapter 710 Public and Private Sewers - City of Dearborn, MO (Dearborn), quoted and re-checked
  11. RSMo Section 64.170 — County commissions control construction; issue building permits (Missouri statewide rule), quoted and re-checked
  12. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Dearborn

Dearborn’s own rules

  • Building permitRequired

    Buildings erected, constructed, altered, moved, converted, extended, or enlarged inside Dearborn city limits.

    • Permit must conform to Chapter 405.
    • Permit is valid for six months.

    permit validity: 6 months

    “No building shall be erected, constructed, altered, moved, converted, extended or enlarged without the owner or owners first having obtained a building permit”
  • Local zoningPresent

    Land inside Dearborn city limits; City of Dearborn Chapter 405 is its zoning regulations.

    • The code index identifies Chapter 405 as Zoning Regulations and includes district regulations, permits, conditional uses, and enforcement.
    “Chapter 405 Zoning Regulations (Section 405.010 – Section 405.420)”
  • Building heightSpecified

    District 1 single-family residential inside Dearborn city limits.

    • The chart states a maximum height of two stories.

    maximum building height: 2 story

    “5 | *1 | 10 | Comparable to existing homes | 6,000 | 60 | 2 story”
  • Who permits septicMixed (with conditions)

    Private sewage disposal systems inside Dearborn city limits.

    • The City issues the private sewage disposal permit and performs inspection through its inspector.
    • System design must comply with recommendations of the Missouri Department of Public Health.
    • Additional requirements may be imposed by the state or county health officer.
    “No statement contained in this Section shall be construed to interfere with any additional requirements that may be imposed by the Health Officer of the State or County.”
  • Septic permitRequired

    Construction of a private sewage disposal system inside Dearborn city limits where public sewer is unavailable.

    • Written permit signed by the City inspector is required before construction.
    • Application uses a City form and may require plans, specifications, and other information.
    • Permit and inspection fee is $10.
    • No permit for subsurface soil absorption systems where lot area is less than 15,000 square feet.

    permit and inspection fee: 10 USD · minimum lot area for subsurface soil absorption: >= 15000 square feet (No permit shall be issued below this area.)

    “Before commencement of construction of a private sewage disposal system, the owner shall first obtain a written permit signed by the inspector.”
  • Septic inspectionRequired

    Private sewage disposal systems inside Dearborn city limits.

    • Inspector may inspect at any construction stage.
    • Applicant must notify the inspector for final inspection before underground portions are covered.
    • Inspection timing is four hours for forenoon notice and eighteen hours for afternoon notice.

    inspection response for forenoon notice: 4 hours · inspection response for afternoon notice: 18 hours

    “the applicant for the permit shall notify the inspector when the work is ready for final inspection and before any underground portions are covered.”
  • Mandatory utility hookupSewer (with conditions)

    Human-occupancy, employment, recreation, or other properties inside Dearborn city limits where a public sanitary sewer is located or may be located in the abutting street, alley, or right-of-way.

    • Connection is required at the owner's expense within 90 days after official notice.
    • The public sewer must be within 100 feet of the property line.
    • Where public sewer is unavailable under the rule, a private sewage disposal system may be used.

    connection deadline after official notice: 90 days · maximum sewer distance from property line: <= 100 feet

    “within ninety (90) days after date of official notice to do so, provided that said public sewer is within one hundred (100) feet”
  • Permit processPartial

    Building-permit applications inside Dearborn city limits.

    • Applications must include drawings or plats in duplicate or more as required by the enforcing officer.
    • Materials must show lot lines, buildings, building locations, proposed uses, and any other information necessary for enforcement.
    • A boundary survey, staking, and complete construction plans may be required.
    “All applications for building permits shall be accompanied by a drawing or a plat in duplicate or more as required by the enforcing officer”

Still unanswered

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

  • Owner-builder exemption — Owner-builders inside Dearborn city limits.
  • Building code adopted — Building-code adoption inside Dearborn city limits.
  • Inspections — Building inspections inside Dearborn city limits.
  • Certificate of occupancy — Certificates of occupancy inside Dearborn city limits.
  • Minimum dwelling size — Minimum dwelling size inside Dearborn city limits.
12 more unanswered
  • Lot coverage
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

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 Dearborn publishes no rule on the point, not that none exists. Platte County’s page lists the county offices to call.

← All of Platte County: county rules, score and offices