Bolthole Index

Denton County, Texas

Building permits, zoning and septic in the Town of Flower Mound, Texas

The Town of Flower Mound, Texas requires building permits for new construction and additions, alterations or repairs, and administers its own zoning.12 Inside town limits, Flower Mound regulates septic systems with TCEQ oversight; Denton County’s septic authority covers unincorporated land.34 RV habitation and temporary occupancy are prohibited in Flower Mound residential districts.5

At a glance

Building permits
Required for new construction and building or trade-work changes1
Zoning
Town planning and zoning applies inside town limits2
Septic authority
Flower Mound, with TCEQ oversight3
RV living
Habitation and temporary occupancy prohibited in residential districts5
Minimum dwelling size
SF-5: 1,500 sq ft; A agricultural: 1,800 sq ft, subject to additional regulations67
Minimum lot size
SF-5: 5,000 sq ft, subject to district and supplementary regulations8

Who to call

Building permits

Town of Flower Mound Building Inspections

Town of Flower Mound Building Inspections inquiries in Flower Mound

972.874.6355

2121 Cross Timbers Rd. Flower Mound, TX 75028

Planning & zoning

Town of Flower Mound Planning Services

Town of Flower Mound Planning Services inquiries in Flower Mound

972.874.6350

2121 Cross Timbers Rd. Flower Mound, TX 75028

Septic permits

Town of Flower Mound Environmental Health

Town of Flower Mound Environmental Health inquiries in Flower Mound

972.874.6340

Floodplain permits

Town of Flower Mound Floodplain Manager

Town of Flower Mound Floodplain Manager inquiries in Flower Mound

972.874.6302

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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Do you need a building permit in the Town of Flower Mound, TX?

Flower Mound requires a building permit before new construction or additions, alterations and repairs to buildings, structures, plumbing, electrical or mechanical work.1 Emergency work performed outside business hours must be submitted for a building permit the next business day, and building-permit and registration fees are non-refundable.1 Flower Mound lists the 2024 International Residential Code and energy and pool codes, together with the 2023 National Electrical Code, for residential construction.9 Ask Town Building Inspections to identify the building-permit application for your proposed work before construction begins.10

Who handles building permits and zoning in the Town of Flower Mound?

Contact Flower Mound Building Inspections at 972.874.6355 for building-permit questions; the office is at 2121 Cross Timbers Rd. Flower Mound, TX 75028.10 Contact Flower Mound Planning Services at 972.874.6350 for land use, zoning, plats, site plans and development approvals.11 Flower Mound asks applicants to contact Planning staff before submitting so the application type, required documents and scheduling expectations are clear.12 Building-permit approval and zoning review belong with the Town, while septic projects inside Flower Mound go to the Town’s Environmental Health office.1213

Does the Town of Flower Mound have zoning and minimum lot sizes?

Flower Mound administers its own zoning inside town limits, so a parcel’s district matters to the home and site layout.2 In Flower Mound’s SF-5 district, the summarized minimum lot area is 5,000 square feet and minimum dwelling floor area is 1,500 square feet, subject to district and supplementary regulations.86 SF-5 minimum yards are 20 feet front, 5 feet side and 20 feet rear, subject to additional Chapter 98 provisions.14 In the A agricultural district, the summarized minimum dwelling floor area is 1,800 square feet and maximum lot coverage is 25 percent, also subject to additional provisions.715 Ask Planning Services to confirm the parcel’s district and controlling requirements before settling on a footprint.11

How do septic permits work inside the Town of Flower Mound?

Flower Mound is the local OSSF authorized agent and permitting authority for septic-related projects inside town limits, with TCEQ oversight.133 Texas generally requires a septic permit and approved plan to construct, alter, repair, extend or operate an on-site sewage facility.16 Start with Flower Mound Environmental Health at 972.874.6340 for the applicable local review; the Town’s environmental health specialists are its designated representatives.13 Texas has a conditional exemption for a single-family dwelling on at least 10 acres, but it requires a site evaluation, on-site disposal, all system parts at least 100 feet from property lines and the other stated conditions; local requirements may be stricter.16 Ask Environmental Health whether that exemption applies to the proposed Flower Mound system before relying on acreage alone.1613

Can you live in an RV or tiny home in the Town of Flower Mound?

Flower Mound prohibits habitation and temporary occupancy of recreational vehicles, travel trailers, campers and similar vehicles on private property in residential districts.5 The residential-district rule permits utility connections only for maintenance and defines those utilities as electricity and water; the prohibition does not provide a duration exception for temporary occupancy.5 We could not confirm a separate tiny-home occupancy rule for Flower Mound; ask Planning Services about the proposed use and Building Inspections about the structure.1110 A small permanent dwelling still faces district-specific floor-area standards: SF-5 requires at least 1,500 square feet under the summarized schedule, subject to additional regulations.6

Building a home in the Town of Flower Mound: what comes first?

  1. Contact Flower Mound Planning Services before submitting a development application, and establish the required application and supporting documents.12
  2. Confirm the parcel’s zoning and proposed site layout with Planning Services before committing to a house plan.11
  3. If the home will use septic, contact Flower Mound Environmental Health for the septic project’s local review, alongside the Texas septic-permit requirements.1316
  4. Apply through Town Building Inspections for the building permit before construction or covered trade work begins.1
  5. Use the Town’s Floodplain Information Request and contact the Floodplain Manager about the property’s floodplain questions.17

Flower Mound development applications may be withdrawn after 6 months without applicant activity; reactivation requires a new application under current standards.12

What should you check before buying in the Town of Flower Mound?

We could not confirm Flower Mound’s private-well permit requirements, mandatory water or sewer connection thresholds, or general accessory-dwelling and manufactured-home occupancy permissions; ask Planning Services to identify the applicable requirements for the proposed property and use.11 For floodplain questions, Flower Mound provides a Floodplain Information Request and lists the Floodplain Manager at 972.874.6302.17 If the property lies outside town limits, consult the Denton County guide: unincorporated development requires a county Development Permit, and Denton County Public Health administers septic regulation there.184 Flower Mound’s own zoning and building-permit requirements apply inside town limits.21

Watch-outs

  • Flower Mound’s residential-district RV prohibition includes temporary occupancy, so do not plan to live in a camper while building there.5
  • Flower Mound’s SF-5 and A agricultural dwelling standards differ; confirm the parcel’s district and supplementary rules with Planning Services.6711
  • Denton County’s septic authority covers unincorporated land; inside Flower Mound, contact the Town’s Environmental Health office.413

Sources

  1. Building Information and Permits (Town of Flower Mound), quoted and re-checked
  2. Planning Services (Town of Flower Mound), quoted and re-checked
  3. On-Site Sewage Facility (OSSF) (Town of Flower Mound), quoted and re-checked
  4. Environmental Health Division | Denton County, TX, quoted and re-checked
  5. Sec. 66-174. Parking in residential districts (Town of Flower Mound), quoted and re-checked
  6. Sec. 98-1021. Schedule of residential dimensional regulations (Town of Flower Mound), quoted and re-checked
  7. Sec. 98-1021. Schedule of residential dimensional regulations (Town of Flower Mound), quoted and re-checked
  8. Sec. 98-1021. Schedule of residential dimensional regulations (Town of Flower Mound), quoted and re-checked
  9. Building Inspections (Town of Flower Mound), quoted and re-checked
  10. Town of Flower Mound Building Inspections (flowermound.gov)
  11. Town of Flower Mound Planning Services (flowermound.gov)
  12. Applications / Checklists (Town of Flower Mound), quoted and re-checked
  13. Town of Flower Mound Environmental Health (flowermound.gov)
  14. Sec. 98-1021. Schedule of residential dimensional regulations (Town of Flower Mound), quoted and re-checked
  15. Sec. 98-1021. Schedule of residential dimensional regulations (Town of Flower Mound), quoted and re-checked
  16. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  17. Town of Flower Mound Floodplain Manager (flowermound.gov)
  18. Development Services, quoted and re-checked

Written October 11, 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 Town of Flower Mound

Town of Flower Mound’s own rules

  • Building permitRequired

    New construction and additions, alterations, or repairs to buildings, structures, plumbing, electrical, or mechanical work inside Flower Mound town limits.

    • Emergency work performed outside business hours must be submitted for permit the next business day.
    • Permit and registration fees are non-refundable.
    “Permits are required before performing any new construction or any addition, alteration or repair of existing buildings, structures, plumbing, electrical, or mechanical work (exception: all work which requires a permit, but is performed outside business hours for emergency reasons, must be submitted for permit the next business day). All permit and registration fees are non-refundable.”
  • Building code adoptedAdopted

    Residential and commercial construction inside Flower Mound town limits.

    • Residential codes listed are the 2024 IRC, 2024 IECC, 2024 ISPSC, and 2023 NEC.
    • Commercial codes listed are the 2024 IBC, 2024 IPC, 2024 IMC, 2024 IECC, 2024 ISPSC, and 2023 NEC.
    • The Town Fire Department has a local amendment requiring automatic sprinklers in commercial buildings over 4,000 square feet.

    commercial sprinkler threshold: > 4000 sq ft (Town Fire Department local amendment)

    “For residential construction: | 2024 IRC (International Residential Code) 2024 IECC (International Energy Conservation Code) 2024 ISPSC (International Swimming Pool and Spa Code) 2023 NEC (National Electrical Code) For commercial construction: | 2024 IBC (International Building Code) 2024 IPC (International Plumbing Code) 2024 IMC (International Mechanical Code) 2024 IECC (International Energy Conservation Code) 2024 ISPSC (International Swimming Pool and Spa Code) 2023 NEC (National Electrical Code)”
  • Certificate of occupancyLimited

    Businesses and changes of owner or occupant of a building or space inside Flower Mound town limits.

    • The Town's building page lists Certificates of Occupancy among permit-required projects when the owner or occupant changes.
    • The inspections page specifically states that the Town issues Certificates of Occupancy for businesses.
    “Certificates of Occupancy (any time the owner or occupant of a building or space changes)”
  • Local zoningPresent

    Land inside Flower Mound town limits; the Town administers its own planning and zoning process and Chapter 98 zoning regulations.

    “Planning Services is responsible for providing the community with the quality of life Flower Mound expects through the impartial administration and enforcement of town codes and regulations pertaining to the development of commercial and residential property through the planning and zoning process.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    A agricultural district inside Flower Mound town limits.

    • The schedule states that individual district regulations and supplementary regulations may modify the summarized standards.
    • The rural-development option applies to qualifying rural development projects on lots of five acres or greater and states a separate five-acre minimum lot area.

    minimum floor area per dwelling unit: >= 1800 sq ft (Subject to Chapter 98 text and supplementary regulations)

    “Min. area/unit (sq. ft.) | 1,800 | 2,400 | 1,500 | 2,100 | 1,800 | 1,800 | 1,100 | 1,100 | 700 | 1,450 | *”
    One more reviewed finding on this topic
  • Minimum lot sizeDistrict specific (with conditions)

    Single-family residential SF-5 district inside Flower Mound town limits.

    • The schedule states that individual district regulations and supplementary regulations may modify the summarized standards.
    • The schedule states that the text of Chapter 98 controls in the event of conflict.

    minimum lot area: >= 5000 sq ft (SF-5 district)

    “Min. lot area (sq. ft.) | 2AC | 1AC | 5,000 | 30,000 | 15,000 | 10,000 | 5,000 | 5,000 | 2,800 | 7,500 | 8,500 | *”
  • SetbacksDistrict specific (with conditions)

    Single-family residential SF-5 district inside Flower Mound town limits.

    • The dimensional schedule may be modified by additional provisions in Chapter 98 or individual district regulations.
    • The table states that the text controls in case of conflict.

    minimum front yard: >= 20 feet (SF-5 district) · minimum side yard: >= 5 feet (SF-5 district) · minimum rear yard: >= 20 feet (SF-5 district)

    “Min. front yard (ft.) | 40 | 40 | 20 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 30 | * Min. side yard (ft.) | 25 | 20 | 5 | 15 | 12 | 10 | 0 | 8 | 10+ | 10 | 8 | * Min. rear yard (ft.) | 20 | 20 | 20 | 30 | 30 | 25 | 10 | 10 | 20+ | 10 | 20 | *”
  • Lot coverageDistrict specific (with conditions)

    A agricultural district inside Flower Mound town limits.

    • The dimensional schedule may be modified by additional provisions in Chapter 98 or individual district regulations.
    • The table states that the text controls in case of conflict.

    maximum lot coverage: <= 25 percent (A agricultural district)

    “Max. lot cover (percent) | 25 | 25 | 55** | 35 | 35 | 40 | 40 | 40 | 40 | 30 | 40 | *”
    One more reviewed finding on this topic
    • District specific (with conditions) — Single-family residential SF-5 district inside Flower Mound town limits.
      “** The maximum lot coverage in the SF-5 single family residential district shall be 55 percent, subject to section 98-1029 , except that the 50 percent limitation set forth in subsection 98-1029(b) does not apply to single-family detached dwellings.”
  • Building heightDistrict specific (with conditions)

    A agricultural district inside Flower Mound town limits.

    • The dimensional schedule may be modified by additional provisions in Chapter 98 or individual district regulations.
    • The table states that the text controls in case of conflict.

    maximum building height: 3/35 stories/feet (A agricultural district)

    “Max. height (stories/ft.) | 3/35 | 3/35 | 3/35 | 3/35 | 3/35 | 3/35 | 3/35 | 3/35 | 3/35 | 2/25 | 3/35 | *”
    One more reviewed finding on this topic
  • Living in an RVProhibited

    Habitation or temporary occupancy of recreational vehicles, travel trailers, boats, campers, or similar vehicles on private property in Flower Mound residential districts.

    • The section applies to residential districts.
    • Utilities are defined by the section as electricity and water.
    • The prohibition does not state a duration exception for habitation or temporary occupancy.
    • The section separately prohibits oversized recreational vehicles over 8.5 feet wide, 14 feet high, or 36 feet long from storage or parking on public thoroughfares or private property in residential districts.

    maximum recreational vehicle width: <= 8.5 feet (Residential-district storage or parking rule) · maximum recreational vehicle height: <= 14 feet (Residential-district storage or parking rule) · maximum recreational vehicle length: <= 36 feet (Residential-district storage or parking rule)

    “No recreational vehicle, travel trailer, boat, boat trailer, camper, camper top, or any other type of vehicle shall be connected to utilities except for the purpose of maintenance. Utilities shall only include electricity and water. Habitation and/or temporary occupancy is prohibited.”
  • Who permits septicMixed

    On-site sewage facilities inside Flower Mound town limits.

    • TCEQ provides approval and oversight of the statewide OSSF framework.
    • Flower Mound states that local governments enforce the laws and regulations.
    • Flower Mound states its current OSSF regulations were adopted in 2010.
    “So who is in charge of regulation? That would be the Texas Commission on Environmental Quality (TCEQ) and the Town of Flower Mound. On-site sewage facility law in Texas is structured as such that local governments will enforce the laws and regulations with approval and oversight by the TCEQ.”
  • Short-term rentalsLimited

    Short-term rentals operating inside Flower Mound town limits.

    • The Town requires payment of its adopted hotel occupancy tax.
    • The official page states the adopted hotel occupancy tax rate is 7%.
    • Registration and monthly reporting are required through the Town's GovOS platform.

    hotel occupancy tax rate: 7 percent (Town-adopted rate)

    “The Town of Flower Mound requires short-term rentals (STRs) operating within the Town to remit the Town's adopted hotel occupancy tax rate of 7% to rentals booked at their property.”
  • Permit feesPublished

    Town permit and inspection fees inside Flower Mound town limits.

    • Fees are adopted by Town Council.
    • The Town states that the most recent adopted fees are on the fee schedule.
    • Additional fees may apply for operational permits, failed inspections, no-shows, cancellations, or subsequent plan reviews.
    “Application, Permit and Inspection fees are adopted by Town Council, typically in association with the update of the International Fire Code adoption. The most recent adopted fees may be found on the fee schedule.”
  • Permit processPublished (with conditions)

    Town development and building-permit submissions inside Flower Mound town limits.

    • Project-specific checklists identify submission requirements.
    • Applicants should contact Planning staff before submitting.
    • Applications may be withdrawn after six months of inactivity; reactivation requires a new application under current standards.
    • Complex projects may require additional departmental approvals and extra review time.

    withdrawal inactivity period: 6 months (No applicant activity)

    “Please contact Planning staff prior to submitting an application at 972.874.6350 or [email protected]. That way we can make sure you understand the process for setting up a User Name and Password; you know the type of application that is needed and what documents are required; and you have a realistic expectation for follow-up and scheduling.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Flower Mound or Denton County directly.

  • Tiny homes — Tiny-home occupancy inside Flower Mound town limits.
  • Manufactured homes — Manufactured-home occupancy inside Flower Mound town limits.
  • Accessory dwellings — Accessory dwelling units inside Flower Mound town limits.
  • Septic permit — Installation or modification of an OSSF inside Flower Mound town limits.
  • Septic inspection — Inspection of an OSSF inside Flower Mound town limits.
4 more unanswered
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption

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 Town of Flower Mound publishes no rule on the point, not that none exists. Denton County’s page lists the county offices to call.

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