A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Alvin, TX
ADU work in Alvin, TX means planning around two things most Houston-area contractors never think twice about: soil that moves and summers that don’t let up. An accessory dwelling unit (ADU) is a small, fully independent home built on the same lot as your main house – its own kitchen, bath, bedroom, and entrance. Whether that’s a detached backyard unit, a garage conversion, or an addition bumping out from the existing footprint, the build has to hold up to gumbo clay and Gulf Coast humidity. As the ADU company of the Kingswell family, we plan for both from the first site visit, and every project starts with a written price. Call (361) 326-2313 to get yours.
Why Alvin Homes Are Different
Alvin sits on some of the most expansive clay soil in Brazoria County. The gumbo here swells when it rains and shrinks when it dries, and any structure that isn’t accounted for that movement ends up with cracks in the slab, sticking doors, or a floor that isn’t level within a year. That’s why we always start an Alvin project by looking at drainage and foundation condition before drawing a single line. A backyard ADU on a pier-and-beam foundation, for example, needs different detailing than one on a slab we pour ourselves, and the difference shows up in the price – which is exactly why our written quote is based on the actual site, not a generic square-footage table.
Summer heat is the other constant. Humidity in Alvin regularly sits above 80% in July and August, which means air sealing, insulation choices, and how the HVAC ducting is routed all change a unit’s comfort and long-term durability. Homes across town – from the established streets near Alvin High School to the newer subdivisions south of Highway 6 – tend to run either 1960s ranches or 2000s builder-spec houses, and each one handles moisture differently. We plan ventilation and vapor barriers with that in mind, then put every commitment on paper so you’re never guessing.
Our Main Alvin Services
Most Alvin homeowners call us about one of three projects: adding square footage to the existing house, converting a garage into living space, or building a detached ADU from the ground up. Each one has its own Alvin page with full pricing detail and local specifics.
Home Addition Contractor in Alvin
A home addition in Alvin usually means tying new foundation work into an existing slab or pier system, which takes real care on this clay. We size footings to the soil conditions, match roof lines so the add-on doesn’t look stapled on, and run the numbers in writing before you commit. If you’re weighing a bump-out for a larger kitchen or a full primary-suite addition, the page has the pricing detail and what to expect with permits. See Home Addition Contractor in Alvin for the full breakdown.
Garage Conversion Contractor in Alvin
A garage conversion is one of the fastest ways to add a bedroom, office, or rental unit to an Alvin lot without changing the building footprint, but the details matter: raising the floor to meet living-space height, replacing the slab if it slopes, insulating the walls you can’t see, and tying the whole thing into your existing HVAC. Many Alvin garages were built as unconditioned space, so that’s where the real work lives. See Garage Conversion Contractor in Alvin for costs and a step-by-step look at how we do it.
ADU Builders in Alvin
A detached ADU on an Alvin lot gives you a full second home – rental income, multigenerational space, or a quiet work setup – without packing up and moving. We handle the site work, foundation, utility runs, and the build itself, and we’re comfortable pairing your project with prefab systems where it makes sense on your lot. The page covers detached unit pricing, lot considerations, and how the 365-Day Done Right Promise applies. See ADU Builders in Alvin for specifics before you call.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Alvin
We work regularly with ADU systems from Mighty Buildings, Boxabl, and Plant Prefab, plus Tuff Shed shells that get finish-out work on-site. If you have a brand in mind or want a side-by-side comparison for your Alvin lot, see our brands page for what we stock, what we recommend, and how turnaround shakes out.
Pricing for ADU Company in Alvin, TX
| Service | Typical range in Alvin |
|---|---|
| Detached ADU (studio, unfinished interior) | $85,000 – $120,000 |
| Detached ADU (1 bed / 1 bath, turnkey) | $140,000 – $190,000 |
| Detached ADU (2 bed / 2 bath, turnkey) | $210,000 – $280,000 |
| Prefab ADU (studio, installed) | $95,000 – $135,000 |
| Prefab ADU (1 bed, installed) | $150,000 – $205,000 |
| Garage conversion (attached, basic finish) | $55,000 – $85,000 |
| Garage conversion (with kitchenette/bath) | $80,000 – $115,000 |
| Home addition (single room bump-out) | $60,000 – $85,000 |
| Home addition (primary suite addition) | $110,000 – $160,000 |
| Site prep only (grading, drainage, utility stubs) | $8,000 – $18,000 |
What pushes a price up in Alvin most often is soil work – if a garage slab has to come out and be repoured with proper vapor barrier, or if drainage on the lot needs regrading before a detached ADU can go in, that’s real money. We’ll tell you exactly what’s included before you agree to anything: written price first, no price changes at the door.
Neighborhoods We Serve in Alvin
We cover all of Alvin, including the neighborhoods below. Crews are scheduled out of our Houston office, and typical response for an Alvin estimate is within a few business days, depending on the season.
- Downtown Alvin and the streets around Alvin High School
- Neighborhoods north of Highway 6 toward Mustang Bayou
- Subdivisions south of town near Alvin Community College
- Areas along South Gordon Street and east toward Chocolate Bayou
- Newer developments west of Highway 35
Service Area – Cities Near Alvin
Our Alvin crew also takes on ADU work in a handful of nearby towns. If you’re in Manvel, TX, Friendswood, TX, Santa Fe, TX, or Dickinson, TX, the site conditions are close enough to Alvin that our pricing and planning approach carries over directly.
Serving Alvin, TX - Our Local Coverage Area
We’re based in the Alvin 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 Company in Alvin
Most Alvin estimates are scheduled within a few business days from your first call, and after the written price is approved, a typical start date lands 4-8 weeks out depending on permit load and the scope of site work. Call (361) 326-2313 and we’ll give you a straight answer on where our schedule stands.
Yes. We pull permits, coordinate inspections, and close everything out – that’s part of every written quote, not an add-on. Alvin has its own permitting path for ADUs and garage conversions, and we walk through it with you before work begins so there are no surprises.
It won’t change because we said so – the number in your written quote is the number you pay, full stop. The only exception is if you add scope (a bigger footprint, upgraded finishes), and we put any change in writing and get your sign-off before proceeding. That’s part of The Kingswell Guarantee.
If you’re weighing an ADU in Alvin, get a real number before you make any decisions. Call (361) 326-2313 to schedule your free estimate with Lodgewick ADU Houston, and we’ll put the price, the schedule, and the guarantee in writing.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Alvin Customers Say
"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills"Added a suite for my dad. They walked us through every cost before a hammer swung and stuck to it. The written price is what we paid, no change orders."
- Ingrid Salazar"Added a bedroom and bath for our growing family. Honest from day one about what was possible and what it would cost. Showed up when they said and the work has held up great."
- Troy Benavidez
