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 Cypress
A home addition or ADU in Cypress typically runs $45,000 to $130,000 for an addition, $90,000 to $220,000 for a new detached ADU, and $30,000 to $80,000 for a garage conversion. The single biggest cost driver in Cypress isn’t square footage. It’s what’s under the slab. Cypress sits on expansive clay that heaves with every wet-dry season, and most of the housing stock was built between 1955 and 1980 on concrete slabs never designed for a 2026 addition. Before you sign anything, you need a contractor who knows which Cypress homes need subgrade work and which ones don’t. We’re Barrett & Sons Construction. Tom Barrett founded this company in 1998, and his sons run the crews. Call (877) 610-1318 for a free estimate on your Cypress addition or ADU.
Why Barrett & Sons Construction Is Cypress’s Preferred Home Additions & ADU Company
We answer our own phone. That matters when you’re spending $80,000 on a detached ADU near Holder Elementary and you have a question on a Tuesday morning. Tom Barrett lives twenty minutes away, and if something’s wrong he wants to know about it, not hear about it from an online review. Every Cypress job we take gets permits pulled and inspections signed. We don’t do the “permits are optional” song. The permit inspector works for you, not for me, so I like him on the job.
Cypress homeowners have been burned. National outfits quote one number on the phone, then discover “unforeseen conditions” after demolition. We put every change order in writing before work proceeds. An allowance that isn’t on paper is a surprise waiting for a date. That’s how we’ve operated since 1998, and it’s why our Cypress customers stay customers. The 90-Day Done Right Promise is written into every contract. If it’s not done right, one call brings Tom back.
Our Home Additions & ADU Services in Cypress
Garage Conversion ADU
Garage conversions are the most popular ADU route in Cypress because they use existing rooflines and foundation area. But most 1960s Cypress garage slabs were poured as driveways with a roof, not as living space. We evaluate the slab before we quote. On a 1968 tract home near Holder Elementary, we opened the floor and found hairline heave cracks running under the load-bearing wall line. We specified a 12-inch-thick thickened edge with #4 rebar doweled into the slab, then 3/4-inch tongue-and-groove plywood with marine-grade adhesive under a 3-inch concrete topping. Permits and inspection cleared the subgrade in one cycle. That’s the difference between a Cypress conversion that lasts and one that cracks in two wet seasons.
New Detached ADU
A detached ADU in Cypress gives you separate utilities, separate privacy, and a separate foundation, which is exactly what you want when the main slab is 55 years old and moving. We pull separate permits for the structure, the electrical panel, and the sewer tap. Cypress’s clay soils mean we typically over-excavate, scarify, and re-compact the subgrade before the form work goes in. It adds cost, but it prevents the racked door frames and popped tile joints that cheap ADU builders hand you down the road.
ADU Site Prep & Utilities
This is where Cypress jobs get real. Clay soil, flat grade, and 60-year-old infrastructure mean we’re frequently trenching new electrical service, replacing run-down cast iron sewer laterals, and tying into gas lines that haven’t moved since the Nixon administration. We coordinate the utility disconnects, the trenching, the backfill, and the compaction. One crew, one point of contact. You don’t manage three subcontractors and hope they talk to each other.
Junior ADU & Interior Conversion
A junior ADU, or JADU, converts interior space into a small separate living unit, typically 500 square feet or less, with its own kitchenette and bathroom. In Cypress, this often means carving space from a two-story home’s first floor or converting an oversized laundry-mudroom area. The advantage is no new foundation work. The catch is sound separation, fire rating, and a separate access point. We walk each property before quoting to see if a JADU actually works for your floor plan and your budget.
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 Cypress
Our Home Additions & ADU team specifies materials you can look up, not mystery brands off a van. For Cypress ADU hardscape and driveway tie-ins, we run Belgard and Techo-Bloc pavers, Oldcastle retaining systems, and Quikrete concrete products. Why these? Because Cypress’s clay movement punishes cheap paver bases within two seasons. We build the base right and seal the joints. If you’re pricing a garage conversion that includes a new entry walk or a detached ADU with a small patio, you get line items with actual brand names, not “pavers, assorted.”
Common Home Additions & ADU Problems We See in Cypress Homes
- Slab heave cracking new work. Seasonal clay expansion under Cypress slabs will rack a new addition’s door frames and pop tile joints within two wet seasons if the subgrade wasn’t scarified and recompacted before the pour. We over-excavate on every structural addition, no exceptions.
- Original stucco delaminating at the tie-in line. When a room addition is framed tight to an un-repaired crack in 1970s stucco, moisture gets behind the veneer and rots the new sheathing. We cut back, inspect, and repair the existing wall before tying in.
- Undersized roof tie-ins on second-story additions. Cypress’s 1960s trusses were not built for a second-floor load. Frames sag under the added weight, then interior drywall cracks along the new load-bearing header within three years. We engineer the connection, not just nail it on.
- Garage slabs that were never meant to be lived on. Most Cypress tract garages were uninsulated, unventilated, and poured thin. A conversion without subgrade work gives you a cold, cracking ADU. We waterproof, insulate, and structurally remediate before the finishes go in.
Pricing for Home Additions & ADU in Cypress, TX
Here’s what we see across Cypress jobs right now.
| Project Type | Cypress Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number? Subgrade work first. If your Cypress slab has heave cracks that need a thickened edge, doweling, and re-leveling, that’s real money before the first wall goes up. Foundation and subgrade assessments on slab-on-grade homes routinely add $8,000 to $20,000 to an ADU scope. Second, utility runs: older Cypress homes often need new electrical services and sewer lateral replacement. Third, finishes: kitchenette, bath, flooring, and windows all have their own range. We provide written change orders for every scope change, so the price only moves when you approve it. Call (877) 610-1318 for a free estimate on your Cypress addition or ADU. Estimates are free, and we’ll walk the property with you.
We Also Serve Cities Near Cypress
If you’re outside Cypress proper, we still cover the surrounding area. We regularly do Home Additions & ADU in Cypress and the neighboring communities, including Jersey Village, Tomball, Cinco Ranch, and Alief. If you’re within a short drive of Cypress and wondering whether we make it out your way, call us. Chances are we already have a crew nearby.
Serving Cypress, TX - Our Local Coverage Area
We’re based in the Cypress 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 Cypress
Cypress garage conversions typically run $180-$320 per square foot depending on finishes, while inland equivalents often come in $40-$70 lower. The gap is soil. Cypress’s expansive clay requires subgrade remediation, thickened slabs, and structural doweling that inland projects on more forgiving soil can skip. If an estimate looks like the inland price, ask whether subgrade work is actually in the scope. Call (877) 610-1318 for an exact quote, with every line item spelled out.
Not always. Many 1960s Cypress slabs can support a second story with targeted improvements, thickened edge beams, and new load-path connections, but nearly every one we evaluate needs at least partial remedial work. We’ll send a structural engineer to look before we quote. The engineer’s findings are yours to keep, and the recommendation comes in writing. Call (877) 610-1318 to schedule an assessment.
Cut back the stucco at the tie-in, inspect the sheathing and framing behind it, repair any moisture damage, and install proper flashing before the new framing ties in. In Cypress, we regularly find rot behind hairline stucco cracks caused by slab movement. It’s a standard part of our additions scope, and it’s why our pricing includes tie-in remediation instead of hiding it as a “surprise” later. Call (877) 610-1318 to talk through your project.
A detached ADU gets its own foundation, period. Tying a new structure to a 55-year-old moving slab is a recipe for differential settlement and cracks along the connection. We pour a separate foundation with its own reinforcement, over-excavated and compacted for Cypress’s clay. It’s more cost up front and dramatically less cost over the life of the building. Call (877) 610-1318 to see what a separate-foundation ADU looks like for your lot.
We assess them before we quote anything. Hairline cracks may be cosmetic. Wider cracks, especially with vertical displacement or racked door frames above them, tell us the slab is moving and needs structural remediation before an ADU gets built. You’ll get a written scope for the repair. We don’t frame over movement. Call (877) 610-1318 for a free estimate and honest slab assessment on your Cypress home.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Cypress since 1998.