Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Highland Park
Adding square footage in Highland Park means working inside a town with its own building department, its own inspectors, and a deed-restriction review process that dates back to the original 1907 planned development. We know how that works because we pull permits here regularly. A room addition in Highland Park generally runs $45,000 to $130,000, while a detached ADU starts closer to $90,000 and can reach $220,000 depending on site prep and finish level. If you’re weighing the project, call Barrett & Sons at (877) 610-1318 and Tom will walk you through the realistic numbers before you spend a dime.
We coordinate scheduling from our Dallas-Fort Worth office, and crews serve Highland Park locally. That means when a framing question comes up on Lakeside Drive or an inspector wants to walk the foundation on Armstrong Parkway, the person who shows up already knows the town’s expectations.
Why Barrett & Sons Construction Is Highland Park’s Preferred Home Additions & ADU Company
Highland Park is one of the few places in North Texas where a contractor can lose a job over a Windows & Doors - Highland Park mullion detail. The town’s architectural review board enforces deed restrictions alongside the building code, so exterior materials, massing, and setbacks all get scrutinized in ways they wouldn’t be fifteen minutes east in Dallas. We’ve worked through that review process enough times to know what gets flagged early and what sails through with proper documentation. That’s the kind of local knowledge you can’t get from a franchise builder.
Tom Barrett founded this company in 1998 and still answers his own phone. His sons run the crews. When you hire us for a home addition in Highland Park, you’re not getting a rotating cast of subcontractors you’ll never see again. You’re getting a family that lives near enough to drive through the neighborhood on the way home. Every scope, every allowance, every change order arrives in writing before the work happens. Permits get pulled, inspections get signed, and the 90-Day Done Right Promise is written into the contract.
We also carry a strong local reputation with Highland Park customers who’ve been burned before by outfits that quoted one price on the phone and handed them a different bill at the door. The permit inspector works for you, not for us, and we like it that way.
Our Home Additions & ADU Services in Highland Park
ADU Design & Permitting
Highland Park’s independent building department means an ADU that’s approved in University Park won’t automatically pass here. We handle the full design and permit package, including the architectural review submission the town requires before a single footing gets dug. The black clay under much of the 75205 zip code means your ADU foundation will likely need an engineered post-tension slab or piers, and we design for that from the first drawing, not as a surprise change order later. Our Home Additions & ADU team has managed enough Highland Park submittals to know which details trigger review comments and which ones clear without a pause.
Garage Conversion ADU
Converting a detached garage on the older platted streets off Preston Road comes with a set of challenges most Dallas builders never see. Many of those 1920s and 1930s garages sit on unreinforced slabs and were framed when a car weighed 2,000 pounds less than today’s SUV. In Highland Park, a garage conversion typically runs $30,000 to $80,000 depending on whether we’re reinforcing the slab, re-framing for living space, or running new utilities from the main house. We bring the same permit discipline to a garage conversion that we bring to a six-figure addition.
New Detached ADU
A new detached ADU in Highland Park starts around $90,000 and can pass $220,000 for a finished unit with a full bath and kitchen. The price swing comes from site access, tree protection requirements, and the foundation system the soil demands. North Texas expansive clay moves seasonally, drying out in July and August and re-saturating in spring storms, so any new structure needs a foundation designed for that movement. We’ve built detached ADUs in Highland Park and we know which lots back up to trees with root protection zones that change the foundation plan.
Junior ADU & Interior Conversion
Converting a finished attic, an oversized utility room, or a first-floor study into a junior ADU gives you rental income or multi-generational space without changing the footprint of the house. In Highland Park, where many homes are Tudor or Colonial Revival with steep roof pitches, the space is often already there under the eaves. We handle the egress requirements, the separate entrance, and the small kitchen or wet bar the unit needs to actually function as a rental. These interior conversions usually land between $45,000 and $130,000 depending on plumbing and electrical scope.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Highland Park
When we finish a Highland Park project, we want you to know exactly what’s behind the walls and under the tile. We install Schluter waterproofing systems in bathrooms and shower surrounds, and we use Grohe fixtures where clients want European plumbing that holds up to hard water. On additions that tie into existing Highland Park Roofing, GAF materials keep the clean look consistent across the new roofline. We keep common parts accessible so a warranty follow-up doesn’t stall while we wait on a shipment.
Common Home Additions & ADU Problems We See in Highland Park Homes
- Foundation movement from Blackland Prairie clay. The shrink-swell soil under Highland Park is some of the most active in Texas. Older homes without post-tension slabs or piers shift seasonally, and any new addition has to be designed so it moves independently of the original foundation without cracking at the tie-in.
- Historic framing that won’t cleanly tie to new construction. Many 1920s and 1930s homes were framed with dimensional lumber at spacings and load paths that don’t match modern code. A second-story addition or a new wing means we’re often reinforcing existing framing first, which is part of why Highland Park room additions trend toward the higher end of the $45,000 to $130,000 range.
- Deed restrictions that override what the building code allows. A project can be fully code-compliant and still get stopped by the town’s architectural review if the exterior massing, setback, or material palette conflicts with neighborhood covenants. We review deed restrictions before we draw, because redesigning after review is the single most expensive mistake we see out-of-town builders make here.
- Teardown-adjacent additions on narrow, irregular lots. Highland Park’s older platted streets have lot widths and setbacks that don’t match anything in the new subdivisions to the north. When you’re adding to a house that sits on a lot laid out a century ago, access for equipment and materials becomes a real design constraint, not just a scheduling note.
Pricing for Home Additions & ADU in Highland Park, TX
A home addition in Highland Park generally falls between $45,000 and $130,000. Detached ADU construction runs $90,000 to $220,000, while garage conversions land at $30,000 to $80,000. Where your project lands inside those ranges comes down to foundation work, structural reinforcing on the existing house, finish level, and how the architectural review shapes the exterior.
Here’s the honest part: Highland Park is not a budget market. The town’s strict review standards, the active soil, and the age of much of the housing stock push every number higher than the same project would cost in an adjacent suburb. But here’s the second honest part: a written scope and a written change order policy mean the number you approve is the number you pay. No allowances hiding in the corner waiting to surprise you. Call (877) 610-1318 and we’ll walk your specific lot and give you a line-item estimate. The estimate is free.
We Also Serve Cities Near Highland Park
We work throughout Highland Park and the surrounding communities, including University Park, Dallas, Richardson, and Irving. Each city has its own permit path, and we’ve pulled them all. If you’re looking at a Kitchen Remodeling in Highland Park project or a full Bathroom Remodeling in Highland Park alongside your addition, we handle those under the same roof and the same written contract.
Serving Highland Park, TX - Our Local Coverage Area
We’re based in the Highland Park 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 - Home Additions & ADU in Highland Park
A home addition in Highland Park typically costs $45,000 to $130,000, with the final number driven by foundation reinforcement, structural tie-ins to the existing house, and the town’s architectural review requirements. A detached ADU runs $90,000 to $220,000, and a garage conversion usually lands between $30,000 and $80,000. Call (877) 610-1318 for an exact quote on your lot, estimates are free and the scope arrives in writing.
Only if you change the scope, and even then, you’ll see the number in writing before anything moves. Every change order at Barrett & Sons is documented and signed before work proceeds, so there are no end-of-job surprises. An allowance that isn’t on paper is a surprise waiting for a date, and Tom doesn’t work that way.
Yes, on every eligible job. Highland Park runs its own building department separate from the City of Dallas, and we submit to that department directly. The town also enforces deed restrictions through its architectural review board, so we handle that layer of approval as part of the permit package. The inspector works for you, not for us, and we like it that way.
Yes, we cover the entire 75205 zip code, from the older streets near Armstrong Parkway and Lakeside Drive to the newer luxury builds throughout the town. If you’re inside Highland Park’s municipal boundary, we handle the scheduling and the permits for your specific lot. Our crews serve Highland Park locally, and a live person answers the phone 24 hours a day.
Every job carries our written 90-Day Done Right Promise. If something isn’t right, one call brings Tom back to make it right. It’s written on the contract, not buried in fine print, and it applies to every addition, ADU, and conversion we complete in Highland Park. Call (877) 610-1318 to schedule your free estimate and we’ll put the warranty in writing before you sign anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Highland Park with honest pricing and written change orders since 1998.