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 Murphy
Building an ADU in Murphy means adding a second home to your lot, and we treat it that way. We’re Lodgewick ADU Dallas, the ADU company of the Kingswell family. We coordinate every Murphy project directly from our Dallas-Fort Worth office, with crews working in Rolling Creek, Maxwell Creek, and the neighborhoods off Betsy Lane and North Murphy Road every week. If you’re weighing a detached backyard unit, a garage conversion, or a prefab ADU on your Murphy property, call (361) 204-4652. You’ll get a written price before any work starts, and a live person answers that number 24/7. No voicemail loops, no guessing.
Why Lodgewick ADU Dallas Is Murphy’s Preferred ADU Builders Company
Murphy homeowners have a right to be skeptical. Too many have been burned by a contractor who quoted one number, showed up late, and left a mess. That’s why we put everything in writing before the first nail is driven. The Kingswell Guarantee runs through every Murphy project: written price first, a real arrival window, a clean job site, and a written guarantee delivered before we begin.
Russ Delmar leads our ADU work in Murphy. He’s been with Lodgewick ADU Dallas since it came into the Kingswell family of home-service companies in 2010, and he knows what Collin County’s permitting process does to timelines. Homeowners consistently tell us the same thing: the price we wrote down is the price they paid, and when something wasn’t right, we came back.
Our Murphy customers also know who’s on their property. Every technician is background-checked and uniformed. When the crew pulls up, you know exactly who’s walking your lot. And if you call with a question mid-build, a person answers, not a phone tree.
Backyard ADU in Murphy
A Backyard ADU in Murphy is a detached accessory dwelling unit built in your rear yard, separate from the main house. In Murphy, that typically means a 400 to 800 square foot structure with its own kitchen, bath, and entrance. Most Murphy lots are large enough to accommodate one, but setback rules and the city’s drainage requirements shape where it can go and how the site work gets priced.
In Murphy, a backyard ADU built from site-framed construction typically runs $180,000 to $320,000 depending on size, finishes, and the lot’s slope. A prefab approach using a Boxabl core module or Plant Prefab panel system can land between $140,000 and $260,000 once site work, foundation, and utility connections are included.
Site Work and Drainage on Murphy Lots
Murphy sits on expansive clay soil, and the city’s lot drainage rules often require an engineered swale or retaining edge. That adds $3k to $6k to site work compared to a flatter lot in Dallas. We price this upfront, in writing, so it doesn’t surprise you later.
Foundation Choices for the Clay
For a permanent backyard ADU in Murphy, we recommend slab-on-grade with deeper edge beams and proper soil prep. Pier-and-beam works too, but clay movement means the framing has to accommodate it. We’ll spec the right approach during the estimate, not guess at it.
ADU Construction in Murphy
ADU Construction in Murphy means building a new dwelling unit on your property, whether that’s from the ground up, a conversion of existing space, or the installation of a prefabricated structure. Every one of these in Murphy runs through Collin County’s ETJ review process, not Murphy’s city hall. That distinction changes the permit calendar, the inspection scheduling, and which code editions apply. We handle all of it.
Plan check in the Collin County ETJ typically takes two to four weeks before we can pull a permit. Then comes site prep, foundation, framing, rough-in for plumbing and electrical, insulation, drywall, finishes, and final inspection. A realistic start-to-finish timeline in Murphy is five to eight months for a custom build, and four to six months for a prefab ADU on a prepared slab.
Coordinating Collin County Inspections
Collin County residential inspectors cover a large unincorporated area, so scheduling a rough-in inspection can sit for several days. We plan around that reality from day one. Our Murphy jobs are sequenced so trades aren’t standing around waiting on an inspector.
Keeping the Site Clean and Safe
A construction site on your property shouldn’t feel like a war zone. Our crews follow The Kingswell Way: say the price before the work, show up in the window given, leave the place cleaner than found. We walk every Murphy job at the end of each day and clean up before we leave.
Trusted Brands We Service in Murphy
We install and finish ADUs from Mighty Buildings, Boxabl, and Plant Prefab, and we frame custom exteriors with James Hardie siding when the design calls for it. For Murphy’s clay soil and drainage requirements, prefab cores like Boxabl arrive as a pre-built module set on a permanent slab, cutting several weeks off the build calendar. We coordinate delivery, crane placement, and the Collin County inspections that follow. If a Murphy homeowner wants a Tuff Shed frame converted into a finished ADU, we handle the insulation, electrical, plumbing, and finish work that turns a shell into a dwelling. Parts and materials are ordered locally for faster turnaround on changes.
Common ADU Builders Problems We See in Murphy Homes
- The Collin County ETJ surprise. A contractor assumes Murphy city hall issues ADU permits directly. They miss the ETJ review entirely and lose two to four weeks at plan check before a shovel hits the ground. We file through Collin County from day one.
- Generic per-square-foot pricing that misses drainage. Murphy’s lot drainage rules often require an engineered swale or retaining edge. A cheap quote ignores that and hits you with a change order later. Our written price includes it.
- Exposed clay and slab movement. Building on Murphy’s expansive clay without proper soil prep leads to cracks in the slab and doors that stop closing right. We spec foundation work for the soil we actually have here.
- Inspection gap delays. A crew that expects same-day rough-in inspections in Murphy gets stuck. Collin County’s ETJ inspectors cover a wide area, so a “one-day rough-in” can turn into a five-day gap. We schedule around that reality, not against it.
Pricing for ADU Builders in Murphy, TX
Here are honest numbers for Murphy. A custom-built backyard ADU of 500 to 600 square feet runs roughly $220,000 to $310,000. A prefab ADU from Boxabl or Plant Prefab, installed on a prepared Murphy slab, lands between $140,000 and $260,000. A garage conversion typically costs $90,000 to $150,000 depending on what’s already there for plumbing and power. The biggest cost drivers in Murphy are site work for drainage, foundation depth for the clay, utility trenching distance from the main house, and finish level inside. We write every number down before work begins. Call (361) 204-4652 for a free estimate with a written line-item price. You’ll know exactly what the job costs before you commit to anything.
We Also Serve Cities Near Murphy
Beyond Murphy, our crews work regularly in Dallas, Plano, Garland, and Richardson. Each city has its own permitting quirks, but the same Kingswell Guarantee applies everywhere: written price first, written guarantee on every project. If you’re in a neighboring city and comparing ADU Builders, we’re happy to walk your lot and give you a real number. Our ADU Builders in Murphy team knows the Collin County process inside and out, and we bring that same clarity to every nearby job.
Serving Murphy, TX - Our Local Coverage Area
We’re based in the Murphy 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 Murphy
Murphy does not issue its own ADU building permits. Because Murphy sits entirely within Collin County’s extraterritorial jurisdiction, the county handles ADU plan review, permitting, and inspections. That means your plans go to Collin County, not Murphy city hall. We handle the submittal and manage the inspection schedule for you. Call (361) 204-4652 and we’ll walk you through the timeline for your specific lot.
Plan for five to eight months for a custom-built backyard ADU in Murphy, and four to six months for a prefab ADU on a prepared slab. Permit review through Collin County’s ETJ takes roughly two to four weeks before construction starts, and inspection scheduling adds buffer between trades. We build that buffer into the calendar from the beginning so you’re not surprised. Call (361) 204-4652 for a written timeline tied to your project scope.
Slab-on-grade with deeper edge beams and proper soil prep is the most dependable foundation for an ADU on Murphy’s expansive clay. Pier-and-beam can work, but the framing must be engineered for soil movement. The wrong foundation spec leads to cracks and stuck doors within a few years. We spec the foundation for the actual soil on your lot, not a generic formula. Call (361) 204-4652 to schedule a free lot walk and foundation recommendation.
The legitimate price changers in Murphy are hidden site conditions: unexpected rock during excavation, a drainage swale that needs more engineering than planned, or a utility trench that runs farther than the site map suggests. Our written price includes an allowance for normal Murphy soil and drainage conditions. If something genuinely unexpected appears, we stop, show you exactly what we found, and give you a new written number for the change before any extra work proceeds. You’ll never see a surprise line item at the end. Call (361) 204-4652 and we’ll explain how our change order process works in plain English.
Yes. Boxabl core modules and Tuff Shed frames are both workable ADU starting points in Murphy, subject to Collin County ETJ approval. A Boxabl module set on a permanent slab can trim weeks off the calendar because the core arrives pre-built. A Tuff Shed conversion takes longer because the shell needs full insulation, electrical, plumbing, and interior finish work. The permitting path is the same for both. Call (361) 204-4652 and we’ll compare a prefab timeline against a custom build for your specific lot, in writing.
Need a real number for your Murphy ADU? Call (361) 204-4652. You’ll talk to a person, get a free estimate, and walk away with a written price and a written guarantee. That’s how we work in Murphy, and that’s how we’ve worked since 2010.
Written by Russ Delmar, Owner at Lodgewick ADU Dallas, serving Murphy and the surrounding Collin County area.
