Home Additions & ADU in Spring - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Spring

Home additions and ADU construction in Spring, TX typically run $45,000-$130,000 for a full addition, while a garage conversion ADU lands between $30,000-$80,000 and a new detached ADU starts around $90,000. Those are real numbers for this market. If you live off Rayford Road near the Grand Parkway or in a 1980s tract home near Cypresswood and Spring Creek, you’re probably weighing whether to move or build up and out. Moving off your lot, your schools, your neighbors, isn’t always the right answer. We’ve seen it work either way, but when staying put makes sense, Barrett & Sons Construction is the local team you call at (877) 610-1318.

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Why Barrett & Sons Construction Is Spring’s Preferred Home Additions & ADU Company

Barrett & Sons has been owner-operated since 1998, and Tom Barrett’s sons run the crews that work in Spring. You won’t get a dispatcher or a rotating cast of strangers showing up at your door. The people who walk the job are the same names on the contract. That matters in a place like Spring because so much of what we do here-from Spring Roofing to full additions-involves navigating rules that change depending on which side of the county line you’re on.

Spring straddles Harris and Montgomery Counties. A room addition in the 77373 ZIP code can face an entirely different permit and inspection process than the same addition six minutes away in 77382. We know the difference because we’ve pulled permits in both. The Woodlands Community Association adds another layer for Montgomery County jobs around 77380-77382, requiring reviews for impervious cover limits, tree-removal mitigation, and exterior material palettes before you ever break ground. That kind of local knowledge isn’t something an out-of-area crew picks up on day one. It’s earned, job by job, year after year.

Read our reviews from Spring homeowners and you’ll notice the same thread: the price on the first written estimate is the price you pay, unless a written change order says otherwise. Every scope item, every allowance, every adjustment goes on paper before a nail moves. That’s the Barrett & Sons way, and it’s why people in Spring keep our number.

Our Home Additions & ADU Services in Spring

These are the four Home Additions & ADU projects we handle most often across Spring’s neighborhoods. Every one starts with the same conversation: what you need, what the county or association will require, and what it will honestly cost.

ADU Design & Permitting

Before any structure goes up in Spring, the plans have to survive two review gauntlets. Harris County and Montgomery County each have their own building code amendments, and any project near Spring Creek falls under post-Harvey FEMA floodplain rules that changed the elevation and freeboard math for thousands of parcels. Our team handles the design, the permits, and the inspections. We don’t treat permits as optional or as a hassle to dodge. The last thing a Spring homeowner needs is an unpermitted addition that torpedoes a future appraisal.

Garage Conversion ADU

Converting an attached or detached garage in Spring is the fastest path to a rentable unit or an in-law suite, and it’s almost always cheaper than building new. The catch here is the slab. Spring’s 1980s and 1990s housing stock sits on Beaumont clay that swells and shrinks with Houston’s wet-dry cycles. Before we frame a single wall, we check the existing slab for movement and drainage. If the grade pitches toward the foundation, a garage conversion can turn into a moisture problem. We fix the drainage before we build, not after the first big rain.

New Detached ADU

Spring has room for this, especially on larger lots in neighborhoods like Gleannloch Farms or along the Spring Creek corridor where parcels open up. A detached ADU in Spring generally runs $90,000-$220,000 depending on size, utilities, and foundation. The foundation work tends to be heavier here than in other Texas markets because of the clay. Expect engineered slab design, moisture barriers, and careful grading. It’s a real house, not a shed with a bathroom. We treat it that way.

Junior ADU & Interior Conversion

Spring homes from the 1980s and 1990s often have formal living rooms, dining rooms, or oversized utility spaces that can convert into a junior ADU without adding square footage. That keeps the footprint small, the cost lower, and the permit path simpler in most cases. For aging parents or adult children coming back home, a JADU inside the existing envelope is often the most practical answer in Spring. We also handle full laundry-to-studio conversions and attached-suite additions for families in the 77379 and 77381 ZIP codes.

While we’re inside the house, we often fold in related work. A Home Addition that touches the existing kitchen flows straight into Kitchen Remodeling in Spring, and a new primary suite addition pairs naturally with Bathroom Remodeling in Spring. Doing both under one roof, one permit set, one crew, saves time and money.

Trusted Brands We Service in Spring

For Windows & Doors in Spring additions and ADUs, we install brands you can look up and verify: Simonton, Ply Gem, PGT, and CGI. These aren’t mystery products off a van. Simonton and Ply Gem are workhorse vinyl and composite lines that hold up fine in Houston’s humidity. PGT and CGI are our go-to when a project calls for impact-rated glass, which more Spring homeowners are asking about after the last few hurricane seasons. We keep these product lines flowing to Spring jobs, and our crews know the local code requirements for window placement, egress, and energy ratings.

Common Home Additions & ADU Problems We See in Spring Homes

• Slab movement under new loads. The Beaumont clay across Spring shrinks in dry summers and swells in wet winters. Adding a room or second story adds weight, and weight on moving clay shows up as cracks. We spec foundation reinforcement or slab leveling before framing.
• Floodplain surprises after Hurricane Harvey. FEMA revised the flood maps along the Spring Creek corridor after 2017. Properties that were fine before now sit in zones with elevation and freeboard requirements. If your addition is in a revised zone, the design changes. We check this first.
• Woodlands Community Association review delays. In the Montgomery County portion of Spring, especially 77380-77382, exterior additions need WCA sign-off on materials, impervious cover, and tree preservation. That can add three to six weeks. We build that into the schedule up front.
• Moisture intrusion in existing walls. Houston humidity plus standing water risk means Spring additions need better moisture barriers than builders used in the 1980s. We see rot and mold hiding behind old siding when we open walls for an addition. Fixed before we close them up.

Pricing for Home Additions & ADU in Spring, TX

We Also Serve Cities Near Spring

Barrett & Sons Construction is built around Spring, and we regularly run crews into the surrounding communities. If you’re in Spring proper or just over the line in The Woodlands, Tomball, Aldine, or Jersey Village, the same owner-operated team, the same written change order rule, and the same 90-Day Done Right Promise apply. We know the county line issues better than almost anyone, because we cross it every week.

FAQs - Home Additions & ADU in Spring