Preston

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Gas availability: available — Full gas service throughout Preston via Atmos Energy Mid-Tex. Texas HB 17 (2021) prohibits Texas cities from adopting all-electric mandates; Dallas has no electrification ordinance. Preston ADUs typically install gas tankless water heater + gas furnace to match main-house fuel profile.

Preston / ZIP 75225 consistently ranks among the highest-value ZIP codes in Dallas. Zillow and Redfin ZIP-level trackers for 75225 reported median sale price in the $1.8M-$2.4M range through 2024-2025, roughly 7x the Dallas citywide median (~$295K). Submarkets vary sharply: Volk Estates and Strait Lane estate parcels regularly trade at $5M-$25M+; Preston Place and the smaller mid-century pockets range $900K-$1.5M; condo / townhouse stock (near Preston Center) $450K-$1.2M. Effective property-tax rate is the Dallas County countywide effective rate (DISD + City + County + Parkland + Dallas College blended). The Texas Residence Homestead 10% appraisal cap limits year-over-year assessed-value increases on owner-occupied primary residences — a significant benefit in Preston given recent price appreciation. Property tax values here are ADU-relevant: the $2.1M median corresponds to roughly $34,860/year in base tax, so even a modest ADU-driven assessment delta is meaningful.

Preston Hollow has higher HOA / deed-restriction prevalence than typical Dallas single-family neighborhoods but lower than master-planned suburbs like Frisco or Prosper. The 1940s-1960s Preston subdivisions (Devonshire, Volk Estates, Strait Lane) carry active HOAs with enforced architectural controls. Newer infill parcels along Preston Rd and Inwood Rd often carry deed restrictions from the original plat but no active HOA. The practical ADU impact is similar across both regimes — both layers of private governance typically require approval or consent before a detached accessory dwelling unit may be constructed.

• airport-noise-zone — Dallas Love Field AICUZ (Air Installations Compatible Use Zones) — Preston sits ~3.5-4 miles east-northeast of Love Field. The 65 dB DNL noise contour does NOT typically reach ZIP 75225, which is east of the primary flight paths. The 60 dB DNL contour may touch the western edge of Preston near Midway Rd / the Dallas North Tollway.
  Not a practical constraint on most Preston ADU construction. Owners on the western edge (near Midway / the Tollway) may see modest benefit from upgraded-STC windows but Dallas does not require noise-attenuation construction for residential outside the 65 dB contour.
• flood-zone — Bachman Branch and its tributaries cross the Preston locale in the vicinity of Walnut Hill Ln and the western Preston Hollow / Bluffview transition. FEMA-mapped Special Flood Hazard Areas (Zone AE) follow the creek corridors in narrow strips; most Preston parcels sit on the high Austin Chalk uplands and are Zone X. · +21d · +15% cost
  Approximately 3-5% of Preston parcels touch mapped SFHA along Bachman Branch. Those parcels require elevation certificates, floodplain-ordinance compliance, and typically higher flood-insurance premiums. The majority of Preston parcels are Zone X (minimal flood risk).
• other — Preston Hollow residential subdivisions carry 1940s-1960s deed restrictions and restrictive covenants that independently govern accessory structures, typically limiting each lot to 'one single-family dwelling'. Enforced under Texas Property Code Ch. 202 (covenant enforcement) by neighbors or by successor HOAs. Key subdivisions with active restrictions: Devonshire, Volk Estates, Strait Lane, Preston Place, Meadowbrook, Northern Hills, Glen Lakes. · +60d
  This is the single most important regulatory overlay for Preston ADU analysis. Owners must independently review recorded restrictions before committing to the Dallas BoA special-exception process. Restriction language varies — some subdivisions permit detached accessory structures occupied by family members but prohibit separate rental dwelling; others prohibit any second unit. A title attorney's opinion on covenant compatibility typically costs $500-$1,500 and is advisable before filing.
• other — Active homeowners associations in portions of Preston Hollow enforce architectural-review standards over any new exterior construction. Devonshire HOA, Volk Estates, and several smaller Preston Hollow subdivision associations maintain Architectural Control Committees. · +30d
  Preston HOAs commonly require ACC approval before a permit application. Approval is discretionary and can impose design conditions (matching roof pitch, masonry veneer, fenestration style) that add 10-20% to ADU construction cost. Texas Property Code Ch. 209 governs the HOA's procedural obligations but does not preempt its substantive power over accessory structures.

These sections come from the city page. Click through to the Dallas ADU research for details.

• legal history
• size range
• permitting process & fees
• permit forms
• contacts
• utilities
• incentives
• viability
• resale value impact
• construction timeline
• pre-approved plans
• financing
• service complexity