Fast, Reliable New Detached ADU Across Cypress
A new detached ADU in Cypress, TX typically runs $185,000-$320,000 all-in, drawings through final inspection. That number lands where it does because Cypress lots run small, the original tract homes were built between the 1960s and 1980s, and the utilities feeding them were sized for a different era. Ellery ADU Studio is a design-build practice, not a general contractor: the drawings, the permit set, and the construction sit under one contract at one written price. If you’re weighing a detached unit against a garage conversion, we’ll put both numbers in front of you before you sign anything. Call (971) 497-2402 to schedule a free estimate.
Why Ellery ADU Studio Is Cypress’s Preferred New Detached ADU Company
Most ADU projects stall in the gap between the person who drew it and the person who builds it. We closed that gap in 2015, when Nadia Ellery founded the studio around a single contract: one written price, one accountable team, one paper trail from schematic through final inspection. Under The Haven Standard, Clause 1, every Cypress project gets a written price before work starts. No “call for a quote.” The number is on the page.
Cypress homeowners tend to do their research before they pick up the phone. They’ve already read the horror stories about scope creep and permit rejection. That’s why our Cypress proposals include the documentation, not a summary of it: the full permit set, the written scope, the photo record from every site visit. If you have a written estimate from another firm already in hand, we’ll review it as a free second opinion. Nadia Ellery has led more than 900 ADU projects since 2015, and every one of them carried a written price before a single tool touched the property.
Our crews serve Cypress directly from the Houston metro office. That means scheduling stays local, parts and prefab modules route through suppliers we know, and someone answers the phone at (971) 497-2402 when you call. Not a voicemail queue. A person.
Our New Detached ADU Services in Cypress
Custom Built ADU
A custom-built detached ADU in Cypress runs $220,000-$320,000 for a one-bedroom unit with full kitchen and bath. The range shifts based on whether you’re building on a new foundation or tying into existing concrete, and whether your lot triggers a setback variance, the extra distance the city requires between the new structure and the property line. On compact Cypress lots, a variance is common enough that we factor the paperwork into the initial scope rather than treating it as a surprise.
Prefab ADU Installation
Prefab installation in Cypress typically lands between $185,000 and $260,000, including site prep, foundation, utility hookups, and finish work. We specify and coordinate systems from Abodu, Cover, and Dvele within the same single contract, so your prefab unit isn’t orphaned between a factory and a local crew that’s never touched the drawing set. Panelized delivery times shorten the on-site build window, which matters when you’re working inside a 6,000 sq ft lot with limited staging room.
Modular ADU
Modular ADUs share a lot with prefab, but the modules arrive more complete, often with fixtures and cabinetry already in place. In Cypress, a modular Studio ADU runs $195,000-$275,000, depending on utility distance and any electrical panel upgrades the original 100-amp service demands. We handle the crane scheduling, the foundation, and the final connections under the identical written price we gave you at signing.
Studio ADU
A detached studio ADU in Cypress, roughly 400-500 sq ft, runs $185,000-$230,000 turnkey. Studios are the most efficient option for a compact back yard and the fastest to permit, but they still trigger the same electrical and moisture-control requirements as a larger unit. We build the dimple-mat subfloor and the vapor barrier into the foundation line item from the first draft, because Cypress humidity will find the slab if you skip it.
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
We specify and coordinate prefab and modular systems from James Hardie, Abodu, Cover, and Dvele. That means one team handles the design, the permit set, and the installation, so nothing falls between a manufacturer’s warranty and a local installer who’s never read the spec sheet. When a Cypress project calls for a Hardie panel exterior to match the existing ranch style, we order it through local Texas suppliers and stage it on your lot, not a warehouse across town.
Common New Detached ADU Problems We See in Cypress Homes
- Slab moisture wicking on original 1960s concrete: Cypress sits in the coastal plain with persistent marine layer and moderate humidity. Original garage and driveway slabs were poured without moisture retarders, so condensation moves up through the concrete and ruins flooring within a year if you don’t install a dimple-mat or sleeper subfloor first.
- 100-amp panels feeding all-electric ADUs: The original electrical service in most Cypress ranch homes cannot support a second unit with a heat pump, electric range, and dryer. We size the upgrade to 200 amps in the written scope, before drywall, not after the inspector flags it.
- Setback violations from flush-to-fence placement: On a 6,000-7,500 sq ft Cypress lot, the instinct is to push the ADU against the rear property line to save yard space. If the variance isn’t applied for before framing, the city will send you back to redesign, and that’s a four-to-six-week delay at minimum.
- Stucco shear-wall deficiencies on older ranch framing: Tying new framing into 1960s stucco without upgrading the shear wall to 2023 Code fails seismic inspection. We open the wall, assess the existing plywood, and write the retrofit into the scope before the first inspection, not after.
Pricing for New Detached ADU in Cypress, TX
A new detached ADU in Cypress runs $185,000-$320,000 all-in. The spread reflects square footage, site conditions, and what the existing house forces us to fix. Studio units start around $185,000. One-bedroom custom builds land between $220,000 and $280,000. A two-bedroom unit on a lot that needs a panel upgrade, a slab moisture barrier, and a setback variance can reach $320,000. Here’s the line-item breakdown we give every Cypress client:
- Design, structural engineering, and permit set: $18,000-$28,000
- Site prep, foundation, and slab moisture control: $22,000-$38,000
- Framing, siding (James Hardie or equivalent), and roofing: $55,000-$85,000
- Electrical upgrade (100-amp to 200-amp) and rough-in: $8,000-$16,000
- Plumbing rough-in and supply line replacement: $10,000-$20,000
- Drywall, insulation, flooring, and finish carpentry: $40,000-$70,000
- Kitchen and bath fixtures, cabinetry, and appliances: $32,000-$63,000
Every line is locked at signing under The Haven Standard, Clause 5. If a surprise appears when walls open, we price it, you approve it in writing, and only then do we proceed. Call (971) 497-2402 to get your written price.
We Also Serve Cities Near Cypress
Our New Detached ADU team covers the entire northwest Houston corridor. We serve Alief, Spring, Sugar Land, and Houston proper with the same design-build contract and written-price guarantee. If you’re just outside Cypress, call (971) 497-2402 and we’ll tell you whether your lot fits our service area.
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 - New Detached ADU in Cypress
A Cypress lot of 6,000-7,500 sq ft leaves roughly 2,500-4,000 sq ft of buildable yard area once the existing home, driveway, and required setbacks are accounted for. That means a detached ADU consumes most, and sometimes all, of the usable back yard. In practice, we steer many Cypress homeowners toward two-story units with a small footprint, or toward garage conversions and JADUs, which preserve yard space. This is not a hypothetical: a single-story Cypress ranch in Cypress Village pushed our team to design a two-story unit on a narrow side yard because no other footprint would clear the setback requirements. Call (971) 497-2402 and we’ll walk your specific lot dimensions through the same exercise.
The three upgrade you’ll almost certainly face are a 200-amp electrical panel, a moisture barrier for the existing slab, and a shear-wall retrofit where framing ties into original stucco. Cypress’s original tract homes were built with 100-amp panels, slabs without vapor retarders, and stucco over framing that does not meet 2023 Code. We write all three into the initial scope, with a line-item price, so the inspector doesn’t force them on you mid-project. On one Cypress job, our crew replaced aging galvanized supply lines to the new unit after opening the wall and finding corrosion; because the allowance was already in the contract, the schedule didn’t slip.
We price it in writing before we touch it. The Haven Standard, Clause 5, locks the scope at signing, but it also requires that any deviation get a written change order, with a number, that you approve before work continues. No door-side upsells, no “while we’re in here” surprises. If your written estimate from another contractor ballooned after discovery, bring it to us for a free second opinion; we’ll tell you which line items are real and which are padding.
Because the original 1960s and 1970s garage slabs in Cypress were poured without moisture retarders, and the marine layer keeps humidity high enough that condensation wicks up through bare concrete all year. A habitable ADU floor over that slab, with no barrier, will trap moisture under the flooring and grow mold within the first winter. A dimple-mat floating subfloor creates an air gap that lets moisture dissipate; a sleeper system raises the floor off the slab entirely. In Cypress, this is not an upsell. It’s a code-and-comfort requirement, and we write it into the foundation line item from the first draft.
A detached ADU is a separate structure, which on a Cypress lot usually means giving up most of the yard and navigating setback variances. A JADU, by contrast, is a conversion of space already inside the home’s footprint, often a garage or a portion of it, capped at 500 sq ft. For Cypress homeowners who want rental income or an in-law suite without sacrificing outdoor space, a JADU or New Detached ADU in Cypress garage conversion often produces better long-term value than a detached build. We’ll show you both options with printed permit sets and written pricing so you can compare square footage against lot coverage before committing.
Call (971) 497-2402 to schedule your free estimate, or to get a written second opinion on any estimate you already hold.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Cypress, TX.