Coastal ADU Solutions crew at work on a home in Houston, TX

ADU in Houston, TX

A Backyard Home That Adds Real Value

We build detached ADUs, garage conversions and room additions across Houston and the towns around it, from the foundation up.

Free Estimates
Licensed & Insured
11 Cities Covered
No-Obligation Quotes
What We Do

Our Services

A look at the ADU work we handle most, from full detached builds to smaller conversions.

Detached ADU Construction

A standalone unit built on its own foundation, wired and plumbed separately from your main house.

Garage Conversion ADU

Turn the garage you're not using for cars into square footage you can rent or live in.

Attached ADU Additions

Add on to your existing house with a properly rated shared wall and matched roofline.

ADU Design & Permitting

We handle the Houston Permitting Center paperwork so your project doesn't stall for months.

ADU Foundation & Slab Work

A foundation engineered for Houston's clay soil, not a generic slab poured the same everywhere.

Junior ADU Conversions

Convert an existing bedroom into a legal rental with its own entrance.

Who We Are

People Who Know Houston Ground

We build accessory dwelling units for homeowners in Houston who need more space without buying a bigger house. That might be a place for a parent to live close by, a rental unit to help with the mortgage, or a garage that's turned into something worth living in. Most people who call us have already run into the same wall: a builder who can frame a house but doesn't know how Houston's permitting office reviews an ADU application, or one who pours a slab without checking what the clay under it is going to do. That gap is where jobs go wrong.

We start with a soil and site check, not a sales pitch, because the foundation decision comes first here. If your lot sits in a flood zone we look at the elevation certificate before we design anything, not after the permit gets kicked back. We run separate electrical and plumbing tie-ins so the ADU functions as its own unit, not an extension cord off the main house. That's the difference between a structure that passes inspection once and one that still works the way you need it in five years.

10+
Years Experience
500+
Projects Completed
11
Cities Served
More About Us
Coastal ADU Solutions crew working on a home
Licensed & Insured
Estimates are free, always
Where We Work

Serving Houston, TX

Building ADUs across Houston and the towns nearby.

Houston, TX
Pasadena, TX
Pearland, TX
Sugar Land, TX
League City, TX
The Woodlands, TX
Baytown, TX
Conroe, TX
Missouri City, TX
Friendswood, TX
Katy, TX

Not on the list? Give us a call anyway. We are often working nearby.

Why Choose Us

Why people keep calling us back

Most of our work comes from someone telling a neighbor about us. Here is why that keeps happening.

Licensed and Insured

We carry the insurance and licensing an ADU project requires.

Permits Handled For You

We deal with the Houston Permitting Center so you don't have to.

Clean Job Site

Scrap lumber and concrete debris get cleared daily, not left in a pile.

Written, Itemized Quotes

You get a written quote that breaks down foundation, framing and utility costs separately.

Realistic Scheduling

We give you a start date based on the permit timeline, not a guess.

Our Own Crew

The same crew that pours your foundation is on site through framing.

Reviews

What people said afterwards

5.0 from 100+ reviews
Our garage in Houston had a slab crack running right to the door, they repoured it before framing anything. Took an extra week for the inspection to clear but nobody rushed it.
Marcus D.
Garage Conversion ADU · Pasadena, TX
Went with the detached unit out in Katy for my mom. Post tension slab held up fine through this spring's rain, no cracking so far.
Priya S.
Detached ADU Construction · Pearland, TX
We're just outside League City and our lot is half in a flood zone. They got the elevation certificate sorted before submitting, saved us a rejected permit.
Tom R.
ADU Design & Permitting · Sugar Land, TX
Common Questions

Questions we get a lot

Common questions before booking an ADU project.

How much does an ADU cost in Houston?
ADU construction cost in the Houston area typically runs from around $150 to $250 per square foot depending on foundation type, finish level and whether new utility taps are needed. A detached ADU with its own post-tensioned slab and separate electrical service costs more than a garage conversion using an existing foundation. Flood zone lots that require elevation add to the foundation cost specifically.
Are ADU contractors licensed and insured?
ADU contractors in Texas carry general liability insurance and Houston building permits require a licensed contractor of record on file for the project. Ask any ADU builder for proof of insurance and their Houston Permitting Center contractor registration before signing a contract.
How soon can an ADU project start?
Start dates for ADU construction depend on the permitting timeline as much as the contractor's schedule, and a straightforward permit in Houston can take four to eight weeks while a floodplain or deed-restricted lot takes longer. Once permits clear, an ADU builder can usually mobilize within two to three weeks.
What areas around Houston do you build in?
ADU construction services in this area typically cover Houston and surrounding cities such as Pasadena, Pearland, Sugar Land, League City, Baytown, Conroe and Katy, generally within about a 50 mile radius.
Can an ADU be built on any type of property?
Most single-family lots in Houston can support an ADU, but lot size, existing setbacks, and whether the property sits in a floodplain all affect what's allowed. A property with a deed restriction or HOA may limit or prohibit detached units entirely, which is worth checking before any design work starts.
Will a small ADU project like a garage conversion get taken on?
Garage conversions and junior ADU conversions are common, smaller-scope projects that many ADU contractors take on alongside full detached builds. These jobs use an existing foundation and structure, which usually keeps cost and timeline lower than new construction.
How do I get started on an ADU project?
The first step is a site visit to check the lot's setbacks, soil, and flood zone status, followed by a written estimate and a design that gets submitted for permit. Most ADU projects move from that initial site visit to a permit submission within a few weeks.
What actually affects the price of an ADU?
Foundation type is usually the biggest cost driver, since a post-tensioned slab engineered for Houston clay costs more than building on an existing garage slab. Utility hookups, whether a new electrical meter or sewer tap is needed, and finish level on kitchens and bathrooms also move the number significantly.
Is a deposit required before starting work?
Most ADU contractors work on a deposit followed by progress payments tied to completed phases, such as foundation, framing, and rough-in, rather than one lump sum upfront. A contract should spell out exactly what percentage is due at each stage before construction begins.
What happens if it rains during construction?
Foundation pours get rescheduled around rain since a slab poured in standing water won't cure properly, and Houston's spring and summer storms regularly push pour dates back a few days. Framing and roofing work can usually continue on a modified schedule as long as the site drains well.

Contact Info

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(713) 597-2080
Hours
Open 7 days, 8am to 8pm
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