ADU Pass
Mesquite
Dallas County portion
Also in: No County
ADU Pass helps homeowners in Mesquite, Dallas County, Texas navigate the permit paperwork for building an accessory dwelling unit. This area covers 4 ZIP codes.
Map
ADU details
ADU legality: unclear
Texas leaves ADU regulation to local municipalities under home-rule or Dillon-rule authority. Mesquite permits ADUs subject to local conditions per its zoning ordinance.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $1,800 | $34,200 | $36,000 |
| 600 | 600 | $1,800 | $136,800 | $138,600 |
| midpoint | 525 | $1,800 | $119,700 | $121,500 |
| maximum | 900 | $1,800 | $205,200 | $207,000 |
Fee breakdown (as of 2026-04)
Permitting process
- Mesquite Zoning Ordinance accessory-dwelling check (~5d)
Mesquite Zoning Ordinance (Section 2-203 Schedule of Permitted Uses and Section 2-600 Accessory Structure Regulations, as amended by Z.T.A. No. 2018-07 / Ordinance 4604) governs ADU eligibility. ADUs are permitted as accessory uses in single-family districts (R-2 / R-3 / R-4) subject to (a) detached secondary structure not exceeding 50% of primary footprint or 1,000 sqft, (b) shared utility connection with primary, (c) single owner/occupant requirement. Confirm parcel zoning at the Planning & Zoning counter. - Professional license registration (CSS prerequisite) (~3d)
Mesquite requires every permit applicant to register a professional license through Citizen Self Service (CSS) at energov.cityofmesquite.com. Owner-builders qualify only if they own the home, occupy it as their homestead per Dallas Central Appraisal District records, and live in it. Licensed contractors register their state license, COI, and bond. - CSS submittal of Residential Permit application (~2d)
Submit Residential Permit application through CSS (energov.cityofmesquite.com). Required documents: completed application, site plan with setbacks, floor plan and elevations, sealed structural plans (if attached or over 600 sqft), MEP narratives or stamped plans, energy compliance under IECC 2021 / 2024 IRC (Climate Zone 3A), Mesquite Water meter sizing form, and (for parcels in the LBJ Freeway / I-635 corridor) a transportation impact note for any added curb cut. - One-Stop intake routing (~3d)
Mesquite One-Stop (Building Inspection, Planning & Zoning, Fire, Engineering all at 1515 N. Galloway Ave) confirms intake completeness and routes to concurrent reviewers. Code base is 2024 IBC / 2024 IRC with local amendments (adopted 2025); residential plan review fee is 25% of base permit fee under the Mesquite Permit Fee Schedule. - Plan review (building, planning, fire, engineering) (~14d)
Concurrent review across departments. Typical first-cycle items: setback verification (5 ft side / 10 ft rear typical), 50% / 1,000 sqft cap on accessory structure, separation distance (10 ft min from primary), and stormwater impact for parcels along the Town East Branch and South Mesquite Creek floodplains. Mesquite has FEMA AE zones along these creeks; finished-floor elevation requirements apply. - Permit issuance and fee payment (~4d)
Once approved, applicant pays building permit fee (calculated on construction valuation per Mesquite Permit Fee Schedule), plan review fee (25% of permit fee), and water/sewer tap fees if a separate service is required. Pay through CSS. Permit issued with inspection card. - Construction inspections
Required Building Inspection visits: temporary power, foundation, plumbing rough, mechanical rough, electrical rough, framing, insulation, gypboard, final building, final electrical, final mechanical, final plumbing. Schedule via CSS or by phone +1-972-216-6212 with 24-hour notice. Re-inspection fees apply after the first failed visit. - Certificate of occupancy (~5d)
Building Inspection issues CO after final inspections. ADU is recorded with Dallas Central Appraisal District for tax assessment. Mesquite has no separate STR registration for ADUs but the home-rented-as-business rules in Chapter 13 apply to short-term rental advertising. Long-term rental is unrestricted.
Viability (permitted uses)
- Long-term rental: yes Long-term rental of ADU generally permitted; landlord-tenant law and any city rental-registration ordinance apply.
- Short-term rental: with-restrictions STR rules vary by city. Mesquite regulates STRs separately from ADU permitting; check local STR ordinance and HOA covenants.
- Office rental: with-restrictions Detached office rental requires home occupation permit or rezoning.
- Home office: yes Home occupation permitted with restrictions on signage and customer traffic.
- Studio / workshop: yes Personal artist studio is a permitted accessory use.
- Agriculture: with-restrictions Limited urban agriculture permitted in residential zones; livestock varies by district.
- Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.
Contacts
Staff: Building Inspection Division (Permits, inspections, and code adoption questions (1515 N. Galloway Ave)), Planning Department (Zoning, setbacks, accessory-structure interpretations under Section 2-600), CSS Online Portal Support (energov.cityofmesquite.com permit submittal and inspection scheduling)
Utilities
- Water: Mesquite Water Utility · 30d connect · $4,500
- Sewer: Mesquite Sewer / Wastewater · 30d connect · $5,500
- Electric: Mesquite Electric Utility · 21d connect · $1,800
- Gas: Mesquite Gas Utility · 30d connect · $1,500
Property values & taxes
Construction timeline
Realistic total: best 7mo · typical 10mo · worst 16mo
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Texas has no HOA-ADU preemption; HOA covenants restricting ADUs are enforceable.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Legal history (timeline)
Current ordinance: City of Mesquite Municipal Code — Accessory Dwelling Units, adopted 2020-01-01, last amended 2024-04-01
- 2024-01-01 — City of Mesquite ADU code refresh (city-ordinance)
Conforming local-code amendments aligning with current Texas accessory-dwelling framework.
Effect: Codified permissive ADU standards consistent with state law and local zoning.
Dallas County — county ADU rules and overlays
County regulatory overlays
Dallas County's county-level overlays apply only inside its small unincorporated footprint (under 10% of county land, primarily southeastern Dallas County). The two material overlays at county scope are FEMA-mapped Special Flood Hazard Areas administered by Dallas County Public Works under the county's floodplain ordinance, and the countywide Trinity Common Vision Program governing floodplain management along the Trinity River corridor. Inside incorporated cities — where the vast majority of Dallas County residents and ADU-candidate parcels sit — overlay administration is a city function (e.g., the City of Dallas administers its own Escarpment Zone at Dallas Development Code Art. V and its own Floodplain regulations at Div. 51A-5.100). There is no countywide WUI / wildland-fire hazard overlay of the kind seen in California or Washington; North Texas's fire-hazard regime is ESD-by-ESD rather than a county-administered WUI zone.
- Dallas County Floodplain Management (FEMA NFIP participation) — A new ADU in a Zone AE parcel must be elevated to or above the Base Flood Elevation per the county ordinance and is generally not permitted as a basement or ground-floor sleeping space.
- Trinity Common Vision Program — Structures including ADUs proposed within the Common Vision corridor face stricter review than FEMA NFIP alone and may require a No-Rise Certificate from a Texas-licensed engineer.
- On-Site Sewage Facility (OSSF) jurisdiction — An ADU counts as an additional dwelling for OSSF sizing purposes, which can trigger system expansion on undersized lots and may be infeasible on very small unincorporated parcels.
County permitting (unincorporated parcels)
Dallas County regulates construction in unincorporated areas through the Department of Unincorporated Area Services (DUAS), in partnership with the Dallas County Fire Marshal's Office and Public Works. Because the county has no zoning authority (see countyOrdinance), DUAS does not restrict whether an ADU may be built — it regulates only subdivision/plat compliance, residential building-code inspection, on-site sewage (OSSF) compliance, floodplain compliance, 911 addressing, and nuisance abatement. A detached secondary dwelling on an unincorporated parcel is permitted as an ordinary residential structure through DUAS's building-permit pathway; there is no separate 'ADU permit' because there is no county use category for accessory dwellings. Unincorporated Dallas County comprises under 10% of county land area, primarily in the southeastern corner of the county. Most ADU activity in Dallas County occurs in incorporated cities (notably the City of Dallas ADU Overlay at Dallas Development Code Sec. 51A-4.510), which are governed by city-level permitting, not this section.
Texas state — ADU law and programs
State ADU law
Texas has NOT enacted a statewide ADU preemption or ADU-by-right statute. Local governments (municipalities and counties) retain full authority over ADU zoning, setbacks, parking, size limits, owner-occupancy, and permitting. Two recent housing-reform bills in the 89th Legislature (2025) touch density and zoning procedure but do NOT preempt ADU-specific local rules: SB 15 (Bettencourt, signed 2025-06-20, effective 2025-09-01) caps minimum single-family lot sizes in cities over 150,000 in counties over 300,000, and HB 24 (signed 2025-06-20, effective 2025-09-01) raises the protest petition threshold for zoning changes. A dedicated ADU-preemption bill — SB 673 (Hughes, 2025) — passed the Texas Senate on 2025-04-10 and was reported favorably by the House Land & Resource Management Committee on 2025-05-08, but died on the General State Calendar when the 89th Regular Session adjourned on 2025-06-02. In the absence of a state ADU statute, homeowners must consult the ordinance of the municipality (or the county's subdivision rules for unincorporated areas) where the lot sits.
- Texas SB 15 (89R, 2025) — Relating to size and density requirements for residential lots in certain municipalities; authorizing a fee — Prohibits municipalities of population greater than 150,000 located in counties of population greater than 300,000 from imposing minimum lot sizes greater than a specified threshold (3,000 sqft for certain residentially zoned subdivisions; lower for new subdivisions) and limits their authority over setbacks, parking, permeable-surface, and height on those lots. Not ADU-specific, but functionally expands the footprint of small-lot single-family housing in Austin, Dallas, Fort Worth, Houston, San Antonio, and other qualifying cities. Signed 2025-06-20; effective 2025-09-01.
- Texas HB 24 (89R, 2025) — Relating to procedures for changes to a zoning regulation or district boundary — Raises the protest-petition threshold for neighboring property owners who wish to trigger a supermajority city-council vote on a rezoning from 20% to 60%, and constrains the ability of a small minority to block citywide zoning updates. Not ADU-specific; affects the procedural posture of any city-wide ADU-enabling rezoning. Signed 2025-06-20; effective 2025-09-01.
State financing programs
Texas does not operate an ADU-specific statewide loan, grant, or forgivable-loan program comparable to California's CalHFA ADU Grant. The Texas Department of Housing and Community Affairs (TDHCA) administers the state's general housing finance programs — My First Texas Home, My Choice Texas Home, Mortgage Credit Certificates, multifamily Housing Tax Credits, the Homeowner Assistance Fund, and Housing Trust Fund awards. None target ADU construction directly, but several can apply to an ADU as part of a primary-residence purchase or refinance when program criteria are met. ADU-specific financing in Texas is primarily local: the City of Austin's ADU Loan Program (administered through Neighborhood Housing and Community Development) and a handful of smaller pilot programs are the most visible, but these sit at the city tier, not the state tier.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Codes
- 75149
- 75180
- 75181
- 75182
Post Office
- 120 E Grubb Dr, 75149