Bolthole Index

Marengo County, Alabama

Zoning, building permits and septic rules in Demopolis, Alabama

Inside Demopolis city limits, a building permit is required for any excavation, construction or alteration costing $1,000 or more, and the city's Building Department issues it1. Demopolis also has its own zoning ordinance and map covering all land in the city2. Septic permits are not a city matter: a property without public sewer applies to the Marengo County Health Department3.

At a glance

Building permit
Required inside Demopolis for work costing $1,000 or more1
Who issues it
City of Demopolis Building Department45
Zoning
Yes, a city ordinance and map cover all land inside city limits2
Building code
City has adopted the 2015 International Residential Code and 2021 International Building Code6
Septic
County health department permit where there is no public sewer37
RV living
Prohibited in manufactured home parks; other districts not confirmed8
A-1 agricultural lot
Minimum lot area 43,560 square feet9

Who to call

Building permits

City of Demopolis Building Department

Building permits, inspections and certificates of occupancy inside Demopolis city limits; planning and zoning questions

(334) 289-0577

211 North Walnut Avenue, Demopolis, AL 36732

Septic permits

Marengo County Health Department

Septic (onsite sewage) permit applications for Marengo County, including addresses inside Demopolis

334-295-4205

303 Industrial Drive, Linden, Alabama 36748

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Off-grid gear

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

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Do you need a building permit in Demopolis, Alabama?

Yes. Demopolis requires a building permit for any excavation, construction or alteration costing $1,000 or more1. The ordinance also requires a permit before earthwork starts, before building materials are stored, and before a structure is moved, altered or repaired, with exceptions for small repairs and for painting or wallpapering1.

The city's Building Department lists new construction, additions, mobile and manufactured homes, and accessory buildings such as sheds, pools and fences as work that needs a permit5. Anyone who builds, converts or changes the use of a building must also get a certificate of occupancy from the Building Official before the building is used10. We could not confirm an owner-builder exemption from city permits, so ask the Building Department before assuming one applies.

Who issues building permits in Demopolis, and how do you reach them?

The City of Demopolis Building Department, at City Hall, 211 North Walnut Avenue, handles building permits, inspections and zoning questions inside the city; call (334) 289-05775. You apply to the Building Official with the application form and the required fee4. We could not find the fee schedule, so ask the department what your project will cost.

Plans are checked for conformity before a permit is issued, and the required inspections must be finished before a certificate of occupancy is issued11. Inspections should be scheduled at least 24 hours ahead11. The city has adopted the 2015 International Residential Code and 2021 editions of the International Building Code and related codes6.

Does Demopolis have zoning, and what does it mean for RVs, tiny homes, lots and setbacks?

Demopolis has its own zoning ordinance and zoning map, which govern all land inside the city limits2. Zoning must be confirmed with the city's Zoning Administrator before you buy or build2.

Rules differ by district. In the A-1 Agricultural District the minimum lot area is 43,560 square feet9, buildings may cover at most 20 percent of the lot12, and structures may be up to 35 feet tall13. Check which district a parcel sits in before relying on those figures.

For RVs, the ordinance says that in manufactured home parks recreational vehicles may not be occupied as living quarters8. We could not confirm rules for living in an RV elsewhere in the city, for tiny homes, or for accessory dwellings, so ask the Building Department before planning around any of them.

How do septic permits work inside Demopolis?

Septic permits inside Demopolis come from the Marengo County Health Department, not from the city. Before building an onsite sewage system you submit an Application for a Permit to Install an Onsite Sewage Disposal System to your local county health department3. The application includes soils information, a legal description, a plot plan and a vicinity map, and installation can begin only after the permit is issued3.

Demopolis requires a septic tank for a dwelling with piped water and no access to public sewer, and the tank must meet county board of health approval14. If public sewer lies within 300 feet of the property line, the city can require a connection within 90 days of official notice15. Call the Marengo County Health Department at 334-295-4205 and ask for the Environmental Office7. Marengo County's share of soils rated not limited for a conventional drain field is only 5.6 percent, so expect a site evaluation and possibly an engineered system16.

Building a home in Demopolis: the steps, in order

  1. Confirm the parcel's zoning district with the Zoning Administrator at the Building Department, (334) 289-057725.
  2. Find out whether public sewer is within 300 feet of the lot15. If not, apply to the Marengo County Health Department for a septic permit3.
  3. Apply to the Building Official for a building permit with the form and fee4.
  4. Schedule the required inspections at least 24 hours ahead11.
  5. Obtain a certificate of occupancy before anyone uses the building10.

What stays with Marengo County, and what to check before you buy

City rules apply only inside Demopolis. For land outside city limits, see the Marengo County page: Marengo County has adopted no zoning ordinance of its own, so no county rule sets minimum lot size, setbacks or RV occupancy on unincorporated land17. That does not carry into the city.

Septic permits stay with the Marengo County Health Department for every address, city or not18. A driveway onto a state highway needs a permit from the Alabama Department of Transportation, applied for with form BM-11119. Development in a mapped flood hazard area needs a floodplain development permit in communities that take part in the National Flood Insurance Program20. Demopolis lists a Flood Damage Prevention Ordinance, but we could not review its text, so ask the Building Department whether a lot is mapped.

Watch-outs

  • The $1,000 permit threshold is low, so even modest alterations inside Demopolis may need a building permit1.
  • We could not confirm permit fees, private-well rules, short-term rental rules or subdivision rules for Demopolis; ask the Building Department at (334) 289-0577 before you commit5.
  • Marengo County's rule of no county zoning does not apply inside Demopolis, which has its own zoning2.

Sources

  1. Permits - Demopolis Building Department (Demopolis), quoted and re-checked
  2. Building Planning & Zoning (Demopolis), quoted and re-checked
  3. Onsite Sewage - Alabama Department of Public Health (Demopolis), quoted and re-checked
  4. Building Department Overview (Demopolis), quoted and re-checked
  5. City of Demopolis Building Department (building.demopolisal.gov)
  6. Sec. 6-2. - Codes adopted (Demopolis), quoted and re-checked
  7. Marengo County Health Department (alabamapublichealth.gov)
  8. Zoning Ordinance of the City of Demopolis, Alabama (Demopolis), quoted and re-checked
  9. Zoning Ordinance of the City of Demopolis, Alabama (Demopolis), quoted and re-checked
  10. Building Department Overview (Demopolis), quoted and re-checked
  11. Building Department Overview (Demopolis), quoted and re-checked
  12. Zoning Ordinance of the City of Demopolis, Alabama (Demopolis), quoted and re-checked
  13. Zoning Ordinance of the City of Demopolis, Alabama (Demopolis), quoted and re-checked
  14. Sec. 12-22. - Septic tank (Demopolis), quoted and re-checked
  15. Sec. 13-43. - Required installation of toilet facilities and connection to public sewer (Demopolis), quoted and re-checked
  16. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  17. Alabama law on county zoning and building authority
  18. alabamapublichealth.gov, quoted and re-checked
  19. ALDOT Permit Manual, quoted and re-checked
  20. What is the role of the community in floodplain management?, quoted and re-checked

Written October 15, 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 Demopolis

Demopolis’s own rules

  • Building permitRequired

    New construction, excavation, construction, alteration, moving, and covered repairs inside Demopolis city limits.

    • A building permit is required for excavation, construction, or alteration costing $1,000 or more.
    • The ordinance also requires a permit before commencing earthwork, construction, storing building materials, erecting temporary field offices, or moving, altering, or repairing a structure.
    • Repairs not exceeding the City's current minimum cost policies and painting or wallpapering are exceptions in the general procedure.

    minimum project cost: >= 1000 USD

    “Building permits shall be required for any excavation, construction, or alteration the cost of which is one thousand dollars ($1,000.00) or more.”
  • Building code adoptedAdopted

    Construction inside Demopolis city limits.

    • The adopted list includes multiple code editions, including the 2015 International Residential Code and 2021 International Building, Plumbing, Mechanical, Fire, Fuel Gas, Pool, and Existing Building Codes.
    “Pursuant to the authority granted to the cities and towns of Alabama by the Code of Ala. 1975, § 11-45-8(c) as amended, the following Codes are hereby adopted by the city council of the City of Demopolis, Alabama for the purpose of prescribing regulations governing the areas listed below: 2021 Edition: International Existing Building Code 2021 Edition: International Building Code 2015 Edition: International Residential Code”
  • InspectionsRequired

    Permitted construction and zoning-compliance work inside Demopolis city limits.

    • Plans must be inspected for conformity before approval or permit issuance.
    • Required inspections must be completed before the certificate of occupancy is issued.
    • City inspection scheduling should be made at least 24 hours in advance.

    inspection scheduling notice: >= 24 hours

    “the minimum required inspections should be scheduled at least 24 hours in advance.”
  • Certificate of occupancyRequired

    Buildings erected, converted, structurally altered, or changed in use, and land used inside Demopolis city limits.

    • A certificate of occupancy must be issued before use, occupancy, or change in use.
    • Site development plan approval is required first when applicable.
    “No building hereafter erected, converted or structurally altered shall be used, occupied or changed in use and no land may be used until and unless the Building Official shall have issued a certificate of occupancy.”
  • Local zoningPresent

    All land within Demopolis city limits.

    • The zoning map is part of the ordinance.
    • Zoning must be confirmed by the Zoning Administrator.
    “said zoning ordinance and zoning map shall govern and regulate all land within the corporate limits of the city of demopolis, alabama.”
  • Living in an RVProhibited

    Recreational vehicles used as living quarters inside Demopolis manufactured home parks.

    • The prohibition is specific to manufactured home parks.
    “in manufactured home parks, recreational vehicles shall not be occupied as living quarters and manufactured home sales lots shall not be permitted”
  • Who permits septicMixed (with conditions)

    Onsite sewage systems inside Demopolis city limits.

    • Demopolis requires septic tanks when a dwelling with piped water lacks access to public sewer.
    • The city ordinance requires approval by the county board of health.
    • Alabama state law assigns onsite sewage permitting to the local health department.
    “The septic tank must be installed and the septic tank must be built and maintained in a way to meet the approval of the county board of health.”
  • Off-grid sanitationLimited

    Sanitation for dwellings inside Demopolis city limits without access to public sewer.

    • A dwelling with water piped into the building and without access to public sewer must have a septic tank.
    • The septic tank must meet county board of health approval.
    “All property used as a dwelling which does have water piped into the actual building used as such dwelling and which does not have access to a public sewer as provided in section 13-43 shall have a septic tank.”
  • Mandatory utility hookupSewer (with conditions)

    Buildings and properties used for human occupancy, employment, recreation, or other purposes inside Demopolis city limits.

    • The property must abut a street, alley, or right-of-way containing a public sanitary or combined sewer.
    • The county health officer or authorized representative must determine the connection is needed for sanitary or health reasons.
    • Public sewer must be within 300 feet of the property line.
    • Connection is required within 90 days after official notice.
    • The owner bears the expense and a written building-sewer permit is required.

    public sewer distance: <= 300 feet from property line · connection deadline: 90 days after official notice

    “The owner of all houses, buildings, or properties used for human occupancy, employment, recreation, or other purposes, situated within the city and abutting on any street, alley, or right-of-way in which there is now located or may in the future be located a public sanitary or combined sewer of the board, shall be required by the city, at the owner's expense, to install suitable toilet facilities therein, and to connect such facilities directly with the proper public sewer in accordance with the provisions of this article, within ninety (90) days after date of official notice to do so, when it has been determined by the county health officer or such officer's authorized representative that such installation or connection is needed for sanitary or health reasons, provided that public sewer is within three hundred (300) feet of the property line.”
  • Permit processPublished

    Building permit and certificate-of-occupancy process inside Demopolis city limits.

    • Applications require the appropriate form and fee.
    • Site development plan approval is required before permit or certificate issuance when applicable.
    • After issuance, the applicant may proceed only with the action permitted.
    “All persons desiring to undertake any excavation, new construction, structural alteration, or changes in the use of a building or lot except for repairs not exceeding the City of Demopolis’ current minimum cost policies or painting or wallpapering shall apply to the Building Official for a building permit and certificate of occupancy, or statement of zoning compliance, by filling out the appropriate application form and submitting the required fee.”

Rules another office applies inside Demopolis

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

  • Minimum lot sizeSpecified

    A-1 Agricultural District inside Demopolis city limits.

    • Minimum lot area is 43,560 square feet, subject to table footnote (8).

    minimum lot area: 43560 square feet (table footnote (8))

    “a-1 43,560(8) 150 35 40 15 35 - 20% r-1 10,000 70 30 30 10 35 - 25%”
  • Lot coverageSpecified

    A-1 Agricultural District inside Demopolis city limits.

    maximum ground building coverage: 20 percent

    “a-1 43,560(8) 150 35 40 15 35 - 20% r-1 10,000 70 30 30 10 35 - 25%”
  • Building heightSpecified

    A-1 Agricultural District inside Demopolis city limits.

    maximum structure height: 35 feet

    “a-1 43,560(8) 150 35 40 15 35 - 20% r-1 10,000 70 30 30 10 35 - 25%”
  • Septic permitRequired

    New or repaired onsite sewage systems inside Demopolis city limits where the property is not connected to public sanitary sewer.

    • Apply to the local county health department before installation or repair.
    • The application must include soils information, legal description, plot plan, vicinity map, and sometimes a construction plan.
    • The health department reviews the application and soil-test results; installation may begin only after approval and issuance of the permit.
    “Before the construction of an onsite sewage disposal system, you must submit an Application for a Permit to Install an Onsite Sewage Disposal System to your local county health department.”

Still unanswered

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

  • Owner-builder exemption — Owner-builders constructing inside Demopolis city limits.
  • Camping on your land — Temporary camping on private land inside Demopolis city limits.
  • Tiny homes — Tiny-home occupancy inside Demopolis city limits.
  • Accessory dwellings — Accessory dwelling units inside Demopolis city limits.
  • Septic inspection — Septic inspections inside Demopolis city limits.
7 more unanswered
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

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

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