Bolthole Index

St. Louis County, Missouri

Building permits, zoning and septic rules in Black Jack, Missouri

Black Jack, Missouri requires a building permit for new construction, structural changes and major alterations inside city limits1. The city reviews building plans for zoning compliance, and St. Louis County performs the building-permit inspections2. We could not confirm who issues septic permits inside Black Jack, so ask city hall and the St. Louis County Department of Public Health before planning a private system.

At a glance

Building permit
Required for new construction, structural changes and major alterations1
Zoning
City zoning review; $100 non-refundable zoning application fee3
Inspections
Performed by St. Louis County2
Occupancy permit
Required before moving into a dwelling4
Plan review time
10 to 14 working days for building permits5
Septic
Private systems only where public sewer is unavailable; permit authority unconfirmed6

Who to call

Zoning

City of Black Jack, City Hall

Zoning application and plan review for zoning compliance, occupancy permits, and questions about city permits

314-355-0400

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Do you need a building permit in Black Jack, Missouri?

Yes. Inside Black Jack city limits, a building permit is required when any structural change, major alteration or renovation is made to a structure, or when new construction is done1. Normal maintenance generally does not need one, and separate plumbing, electrical and mechanical permits apply when that work is involved1. Plan review for a building permit takes 10 to 14 working days, so build that into your schedule5.

Driveways are covered too: the city's code-enforcement page says permits are required for driveways7. Black Jack has adopted its own building code, and plan review checks the proposed work against it8.

Who issues building permits and inspects in Black Jack?

Black Jack contracts with St. Louis County Public Works to handle building permits and commercial inspections, while the city engineer and director of public works initially reviews building plans for zoning compliance9. All building-permit inspections are performed by St. Louis County29.

For questions about city permits, call Black Jack City Hall at 314-355-04009. The county's own building rules in Chapter 1115 govern unincorporated St. Louis County, not land inside Black Jack, so use them only as background10.

Does Black Jack have zoning, and what does it mean for RVs, tiny homes and lot size?

Black Jack runs its own zoning review inside city limits, and a $100 non-refundable zoning-application fee is due when you submit3. St. Louis County's zoning applies to unincorporated land; where a property is inside a municipality, the municipality's zoning approval is required instead11.

We could not confirm Black Jack's rules on RV occupancy, tiny homes, accessory dwellings, minimum lot size, setbacks or height limits. Ask City Hall at 314-355-0400 for the zoning district of the specific parcel before you buy9. Subdivision indentures can also add private restrictions beyond city zoning12.

How do septic permits work in Black Jack?

Black Jack's plumbing code allows a private sewage disposal system only where a public sewer is not available, and the system must be an approved one that works without surface discharge6. We could not confirm which office issues septic permits inside Black Jack city limits.

Across St. Louis County, a construction permit is required before installing or repairing most onsite wastewater systems, though some single-family lots may be exempt13. The state lists the St. Louis County Plumbing Department and the St. Louis County Department of Public Health as ordinance authorities, and incorporated areas may be handled differently14. Ask both City Hall and the county health department who handles your address before work starts.

Do you need an occupancy permit in Black Jack?

Yes. Occupancy of a dwelling in Black Jack is illegal without an occupancy permit, and you apply in person at City Hall4. A city inspection must find the dwelling free of health, safety and welfare issues first4. Published fees include a $125 first inspection and a $40 owner-occupied purchase occupancy permit; a home rental permit is $6515.

Building a home in Black Jack: the steps, in order

  1. Call Black Jack City Hall at 314-355-0400 to confirm the parcel's zoning district and what is allowed9.
  2. Submit the $100 zoning application so the city can review your plans for zoning compliance3.
  3. Apply for the building permit with a scaled site plan and one copy of detailed plans, then allow 10 to 14 working days for review5.
  4. Add separate plumbing, electrical and mechanical permits where they apply1.
  5. Have St. Louis County perform the building-permit inspections2.
  6. Get the occupancy permit at City Hall before moving in4.

What stays with St. Louis County, and what to check before you buy?

Building-permit inspections for Black Jack projects are performed by St. Louis County2. For land outside city limits, see the St. Louis County page. Flood rules are set by the county for unincorporated land, so ask whether a Black Jack parcel sits in a flood hazard area; we could not confirm a city floodplain rule.

Missouri requires a non-restricted permit to construct or repair a water well, though landowners may install their own well without a permit under the cited law and rules16. St. Louis County's effective property tax rate is 1.2%17.

Watch-outs

  • Unconfirmed in Black Jack: RV and tiny-home occupancy, minimum lot size, setbacks and septic permit authority, so call City Hall at 314-355-04009.
  • A mismatch of offices is easy to make: the St. Louis County building code covers unincorporated land, while Black Jack's own permit and zoning process applies inside city limits101.
  • Occupancy fees are not refundable, and a conditional certificate of occupancy is not allowed except for exterior seasonal repairs415.

Sources

  1. Building Permits | Black Jack, MO (Black Jack), quoted and re-checked
  2. Forms, Permits & Applications | Black Jack, MO (Black Jack), quoted and re-checked
  3. Forms, Permits & Applications | Black Jack, MO (Black Jack), quoted and re-checked
  4. Occupancy Permits & Inspections | Black Jack, MO (Black Jack), quoted and re-checked
  5. Building Permits | Black Jack, MO (Black Jack), quoted and re-checked
  6. Article VII - Plumbing | Code of Ordinances | Black Jack, MO (Black Jack), quoted and re-checked
  7. Code Enforcement | Black Jack, MO (Black Jack), quoted and re-checked
  8. Building Permits | Black Jack, MO (Black Jack), quoted and re-checked
  9. City of Black Jack, City Hall (cityofblackjack.com)
  10. Chapter 1115 - Building Code, quoted and re-checked
  11. Residential Above Ground Swimming Pool Checklist and Guide for a Building Permit, quoted and re-checked
  12. Single-Family Dwelling Design Checklist, quoted and re-checked
  13. OWTS Construction Permit Process, quoted and re-checked
  14. OWTS Construction Permit Process — St. Louis County authorities, quoted and re-checked
  15. Occupancy Permits & Inspections | Black Jack, MO (Black Jack), quoted and re-checked
  16. Water Wells - PUB2945, quoted and re-checked
  17. Effective property tax rate: Bolthole Index county data

Written October 24, 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 Black Jack

Black Jack’s own rules

  • Building permitRequired

    New construction, structural changes, major alterations, and renovations inside Black Jack city limits.

    • Normal maintenance generally does not require a permit.
    • Separate plumbing, electrical, and mechanical permits are required when applicable.
    • Minor-work exceptions include tuck pointing, repairing plaster, exterior painting, certain replacements, property-line sidewalks/driveways, and roof-surface materials.
    “a building permit is required when any structural change”
  • Building code adoptedAdopted (with conditions)

    Construction subject to Black Jack's building-permit review inside city limits.

    • Plan review verifies proposed work is designed in compliance with the city's building code.
    “compliance with the city’s building code.”
  • Certificate of occupancyRequired

    Anyone moving into a dwelling in Black Jack city limits.

    • Application is in person at City Hall.
    • A city inspection must find the dwelling free of health, safety, and welfare issues before issuance.
    • Conditional certificate of occupancy is not allowed unless for exterior seasonal repairs.
    “Occupancy is illegal without an occupancy permit.”
  • Local zoningPresent (with conditions)

    Land and development inside Black Jack city limits.

    • City engineer/director of Public Works initially reviews building plans for zoning compliance.
    • A $100 non-refundable zoning-application fee is due upon submission.

    zoning application fee: 100 USD (Non-refundable)

    “review all building plans for zoning compliance; [...] A $100 non-refundable fee”
  • Off-grid sanitationLimited

    Sanitary drainage for buildings with plumbing fixtures inside Black Jack city limits.

    • Permitted only where public sewer is not available.
    • System must be an approved private sewage disposal system.
    • Private system must be maintained and function without ground-surface discharge.
    “When a sewer is not available, sanitary drainage shall be connected to an approved private sewage disposal system.”
  • Driveway accessRequired

    Driveway work inside Black Jack city limits.

    • The official city page states permits are required for driveways; it does not specify a separate curb-cut or road-access approval process.
    “Permits are required for any plumbing, electrical, or mechanical work for decks, concrete-poured patios, new fences, and driveways”
  • Permit feesPublished (with conditions)

    Occupancy inspections and occupancy permits inside Black Jack city limits.

    • Occupancy fees are not refundable.
    • Listed inspection fees became effective April 1, 2020.

    home first inspection: 125 USD · owner-occupied purchase occupancy permit: 40 USD · home-rental occupancy permit: 65 USD

    “First Inspection $125.00 [...] Owner Occupied (purchase) $ 40.00 [...] Home Rental $ 65.00”
  • Permit processPublished (with conditions)

    Building-permit applications for construction inside Black Jack city limits.

    • One copy of detailed plans is required.
    • Multifamily, commercial, and industrial construction drawings must bear the original seal and signature of a Missouri-registered architect or engineer.
    • A scaled site plan showing distances to property lines and other structures is required.

    building permit plan review: 10 to 14 working days

    “one copy of detailed plans must be submitted”

Rules another office applies inside Black Jack

Black Jack does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • InspectionsRequired

    Building-permit inspections for work inside Black Jack city limits.

    • Black Jack initially reviews building plans for zoning compliance.
    • St. Louis County performs all building-permit inspections under the stated contract.
    “all building permit inspections will be performed by St. Louis County.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Black Jack or St. Louis County directly.

  • Owner-builder exemption — Owner-builders inside Black Jack city limits.
  • Minimum dwelling size — Dwelling construction inside Black Jack city limits.
  • Minimum lot size — Lots inside Black Jack city limits.
  • Setbacks — Structures inside Black Jack city limits.
  • Lot coverage — Lots inside Black Jack city limits.
14 more unanswered
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • 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 Black Jack publishes no rule on the point, not that none exists. St. Louis County’s page lists the county offices to call.

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