A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Preston Hollow
Building an accessory dwelling unit (ADU, a second smaller home on your existing lot) in Preston Hollow runs $180,000 to $420,000 for a custom detached unit, while prefab options land between $130,000 and $280,000 installed. The number that matters more than any national average is the one tied to your specific lot, because Preston Hollow has floodplain easements along White Rock Creek, older deed restrictions, and clay soil that changes foundation costs before framing ever starts. We walk every Preston Hollow lot before quoting, so the written price you get is the price you build to. Call (361) 204-4652 to schedule a free site walk and written estimate.
Why Lodgewick ADU Dallas Is Preston Hollow’s Preferred ADU Builders Company
Lodgewick ADU Dallas is the ADU company of the Kingswell family, and our work in Preston Hollow shows up in the details homeowners here notice: we pull the DWU floodplain verification before we quote a foundation, we read the deed restrictions on your specific block, and we put the price in writing before a single footing is poured. Russ Delmar leads our Dallas team and has walked dozens of Preston Hollow lots from the Park Lane corridor up to the neighborhoods off Royal Lane. He knows which blocks have platted building lines that push an ADU back 10-plus feet and which ones carry older restrictions from the 1950s and 1960s subdivisions.
We coordinate dispatch and scheduling from the Dallas-Fort Worth office, and crews serve Preston Hollow locally. A live person answers every call, day or night, so when you call about your build or your guarantee, you talk to a human, not a voicemail loop. Every project runs under The Kingswell Guarantee: a written price before work begins, a defined arrival window, a clean job site, and a written guarantee, with a free return visit if anything fails within the 365-day period. That commitment goes in writing on every Preston Hollow project.
ADU Construction in Preston Hollow
ADU Construction in Preston Hollow starts with a site-specific reality check: where does your lot sit relative to the 100-year floodplain boundary that follows White Rock Creek, and what do your deed restrictions actually say? We scope every project by pulling the current GIS parcel lines, reading the platted building lines, and checking soil borings before we write a number. A Preston Hollow homeowner needs this level of scoping when the quoted price has to hold, because an ADU built over an undocumented floodplain easement can be stopped mid-build.
Lot Verification Before You Sign
Before excavation, we verify the floodplain boundary with Dallas Water Utilities and compare the current GIS parcel lines to the original survey pins. Preston Hollow has 1960s-era surveys that no longer match the city’s digital records, and that discrepancy can shift your setback or force a pier-and-beam foundation where a slab was assumed. We catch that before you spend a dollar on concrete.
Permit Reality in Preston Hollow
Most detached ADUs in Preston Hollow need a building permit, an electrical permit, a plumbing permit, and often a Dallas Water Utilities floodplain development permit. Plan review typically takes four to eight weeks depending on whether your lot triggers floodplain review. We handle the permit package from start to finish, including the DWU submittals that generic ADU builders skip.
Detached ADU in Preston Hollow
A Detached ADU in Preston Hollow is a standalone second dwelling, typically 400 to 1,200 square feet, built in your side or rear yard with its own kitchen, bath, and entrance. These units run $180,000 to $420,000 for custom builds in this market, with the foundation choice driving the biggest early cost swing. On lots along White Rock Creek or its tributary fingers, a slab-on-grade foundation often fails DWU review, which pushes you to an engineered pier-and-beam system that adds $18,000 to $40,000 before framing.
Foundation Decisions on Clay Soil
Preston Hollow sits on expansive clay that shrinks in drought and swells after rain, especially south of Royal Lane where the clay pockets are deeper. A slab can heave and crack within two wet seasons if the soil wasn’t tested. We take soil borings on every custom ADU lot and design the foundation for what’s actually under your grass, not what worked in a different part of Dallas.
Garage and Setback Adjustments
Some homeowners assume a standard 3-foot side setback applies everywhere in Preston Hollow. It doesn’t. Several lots along Park Lane carry platted building lines that push an ADU back 10-plus feet, and we’ve had to shift setbacks mid-scope after pulling the original plat. Our crew is currently finishing a detached ADU off Walnut Hill Lane near Preston Road where the original 1960s survey pins didn’t match the current GIS parcel lines – we pulled a new boundary survey, shifted the setback 4 feet west, and re-engineered the foundation as pier-and-beam to clear the floodplain easement before passing the first footing inspection.
Trusted Brands We Service in Preston Hollow
We install and finish prefab ADU systems from Mighty Buildings, Boxabl, and Plant Prefab, matched to each Preston Hollow lot’s access, setback, and foundation requirements. Prefab doesn’t mean the lot prep gets easier – the floodplain verification, soil borings, and permit package are identical to a custom build. What changes is the framing timeline: a panelized system can knock four to six weeks off the construction calendar. We stock common components locally and coordinate crane access for lots with tight Preston Hollow alley or driveway constraints.
Common ADU Builders Problems We See in Preston Hollow Homes
- Slab poured without floodplain verification: A stop-work order arrives after footings are in because the DWU floodplain boundary was never checked. Tearing out a fresh slab and re-engineering a pier-and-beam foundation adds $25,000 and two months.
- Wrong setback assumption: The builder used a 3-foot side setback, but the platted building line on that Park Lane block requires 10-plus feet. The ADU has to be redesigned or the permit resubmitted from scratch.
- Expansive clay ignored: Soil borings were never taken south of Royal Lane, and the slab heaves within two wet seasons. Cracks run through the floor and the doors stop closing square.
- Deed restrictions missed: Older Preston Hollow subdivisions carry restrictions from the 1950s and 1960s that limit detached ADUs even when current zoning allows them. We read the deed before you sign a contract.
Pricing for ADU Builders in Preston Hollow, TX
Here are the numbers we’re actually quoting in Preston Hollow right now:
- Custom detached ADU (600 – 800 sq ft): $220,000 – $340,000
- Custom detached ADU (800 – 1,200 sq ft): $310,000 – $420,000
- Prefab or panelized ADU installed: $130,000 – $280,000 depending on system and site work
- Pier-and-beam foundation upgrade over slab: $18,000 – $40,000 when floodplain or soil conditions require it
- Studio ADU (400 – 600 sq ft): $180,000 – $260,000
- Junior ADU (JADU, converted interior space): $70,000 – $130,000
What moves the price in Preston Hollow is what’s under and around the build: floodplain verification, soil borings, survey corrections, setback adjustments, and utility trenching. We give you a written line-item quote before work starts, and that number doesn’t change at the door. Call (361) 204-4652 for a free site walk and exact quote for your lot.
We Also Serve Cities Near Preston Hollow
Our ADU Builders team covers Preston Hollow and the surrounding North Dallas communities, including Dallas, Plano, Garland, and Richardson. If you’re a few miles outside Preston Hollow proper, we’ll still come walk your lot and give you a written price. You can learn more about our work on the ADU Builders in Preston Hollow page.
Serving Preston Hollow, TX - Our Local Coverage Area
We’re based in the Preston Hollow area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Builders in Preston Hollow
Yes. If any part of your proposed ADU footprint falls within the 100-year floodplain boundary that follows White Rock Creek, Dallas Water Utilities will likely reject a slab-on-grade foundation and require an engineered pier-and-beam system instead. That adds $18,000 to $40,000 to the foundation cost and about two to four weeks to the permit review. We verify the floodplain boundary with DWU before we quote, so you’re not surprised mid-permit. Call (361) 204-4652 and we’ll check your lot’s floodplain status as part of the free estimate.
A detached ADU in Preston Hollow typically requires a building permit, electrical permit, plumbing permit, and often a Dallas Water Utilities floodplain development permit if you’re near the creek. Plan review runs four to eight weeks on average, longer if floodplain review is triggered or the survey needs correction. We prepare and submit the full permit package, including DWU submittals, so you don’t lose weeks to resubmissions. Call (361) 204-4652 and we’ll map your specific permit path.
Many do, but some older Preston Hollow subdivisions from the 1950s and 1960s carry deed restrictions that limit detached ADUs even when current Dallas zoning allows them. We pull and read the deed restrictions for your specific lot before you sign a contract, because a deed restriction violation is civil and can’t be fixed with a zoning variance. If your block has restrictions, we’ll tell you in plain terms what’s buildable. Call (361) 204-4652 for a free lot review that includes a deed restriction check.
Plan for 10 to 14 months from first site walk to final inspection for a custom detached ADU in Preston Hollow. Permits take four to eight weeks, foundation and framing run eight to twelve weeks, and finishes, utilities, and inspections fill the rest. A prefab or panelized system from Mighty Buildings or Boxabl can shave four to six weeks off the framing phase, but the permit and foundation timeline stays the same. We give you a written schedule with your written price, so you know the calendar before you commit. Call (361) 204-4652 to get your project on the schedule.
Yes, prefab and panelized ADU systems from manufacturers like Mighty Buildings, Boxabl, and Plant Prefab are permitted in Preston Hollow, provided the foundation, setbacks, and floodplain requirements are still met. The prefab panels don’t bypass DWU floodplain review or Dallas building code – what changes is the framing speed, not the permit path. We install these systems and handle the full site prep so the panelized build meets every local requirement. Call (361) 204-4652 for a free estimate that compares prefab and custom options for your lot.
Written by Russ Delmar, Owner at Lodgewick ADU Dallas, serving Preston Hollow and the surrounding North Dallas communities since 2010.
