ADU Pass
Preston Royal
Also known as Preston Hollow, Preston Royal Village, Devonshire, Midway Hollow, North Dallas, Preston / Royal, 75230
ADU Pass helps homeowners in Preston Royal — a USPS locale inside Dallas, No County, Texas — navigate the permit paperwork for building an accessory dwelling unit. This locale covers 1 ZIP code.
Map
Locale-specific ADU details
Site (parcel physics)
Slope:
Soil:
Lot profile:
Geo-hazards:
Recent ADU permit activity
Utility capacity (upgrade likelihood)
Housing stock age:
Electric service drop:
Sewer lateral:
Water pressure:
Gas availability: available — Atmos Energy Mid-Tex Division serves all of Preston Royal. No all-electric mandate or gas ban in Dallas as of 2026-04-21. Most Preston Royal primary dwellings are gas-heated with gas cooking; ADUs typically tie into the parent home's gas service rather than a separate meter.
Locale property values
Locale market rent
| Sq ft | Rent |
|---|---|
| 300 | $1,450/mo |
| 500 | $1,900/mo |
| 700 | $2,375/mo |
| 800 | $2,550/mo |
Locale HOA prevalence
Locale overlays (2)
- other — No ADU Overlay District has been adopted over any Preston Royal residential parcels as of 2026-04-21. Every ADU application in the locale requires either a Board of Adjustment special exception (3-6 months, $600 filing fee) or a neighborhood-initiated overlay petition (6-18 months; requires at least 50 compact contiguous single-family structures per Sec. 51A-4.510(b)).
The absence of an adopted overlay is the single biggest procedural constraint on Preston Royal ADUs. Neighborhood groups in Preston Hollow and Devonshire have historically opposed overlay petitions as incompatible with the area's low-density residential character. - flood-zone — Bachman Branch and its tributaries cross the southwestern edge of ZIP 75230 near the Preston Ridge Trail. FEMA National Flood Hazard Layer shows Zone AE (1 percent annual chance flood) along the main Bachman Branch channel and Zone X (shaded, 0.2 percent annual chance) on adjacent parcels. Approximately 4-6 percent of 75230 parcels fall in a mapped SFHA, heavily concentrated along the southwestern and southern Bachman Branch reach. · +30d · +8% cost
Parcels along Preston Ridge Trail greenbelt and the lower-elevation swale south of Royal Ln and west of Hillcrest are more likely to carry flood risk. Dallas requires 1 percent annual-chance flood as design standard. ADU in Zone AE must be elevated to or above Base Flood Elevation. Most Preston Royal residential parcels sit well above the Bachman Branch floodplain on the rolling-terrain highlands and are NOT in a mapped SFHA.
Inherited from the city
These sections come from the city page. Click through to the Dallas ADU research for details.
- ADU legality
- legal history
- size range
- permitting process & fees
- permit forms
- contacts
- utilities
- incentives
- viability
- construction timeline
- pre-approved plans
- financing
- service complexity
Dallas — city ADU rules and incentives
ADU legality: with-restrictions
Cross-listed entry. See dallas-county/dallas.json for the primary record. Dallas's overlay-petition framework is unusual: ADUs are largely opt-in by neighborhood vote rather than allowed citywide.
City cost envelope
$153,500 all-in for a 600 sqft ADU (permit + build). Midpoint scenario.
Permit fee bundle: $3,500 (2026-04).
City viability (selected uses)
City incentives
- Texas Homestead Exemption — Owner-occupied primary residence exemption applies to primary structure; ADU added value generally taxed at full rate.
County: no attribution (synthetic bucket)
No county
This city sits in the state's "no county" bucket — its ADU rules derive directly from state law and city ordinance without a county intermediary. No county-level sections apply.
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 Code
- 75367
Post Office
- 5959 Royal Ln Ste 539, 75230