Fast, Reliable Garage Conversion ADU Across Cypress
Garage conversion ADUs in Cypress typically run $145,000 to $210,000 all-in for an attached conversion, drawings through final inspection. A garage JADU (junior ADU) lands between $95,000 and $130,000. Those are written-price ranges, not ballpark guesses. Every project we take on in Cypress gets a fixed price before we start, governed by the same standard we’ve applied to 900+ ADUs since 2015.
We know Cypress lots. Most were platted between 1960 and 1980 with attached two-car garages on 6,000 to 7,500 square feet. That geometry means a detached ADU eats most of the usable yard, which is exactly why garage conversions dominate the Cypress ADU market. If you’re weighing an attached conversion, a JADU, or a garage partition with a bathroom add, call (971) 497-2402 and we’ll give you a written price before any work begins.
Why Ellery ADU Studio Is Cypress’s Preferred Garage Conversion ADU Company
Ellery ADU Studio functions as one contract, one written price: the drawings, the permit set, and the construction are a single scope. No designer-versus-builder blame loop when the inspector flags a window rating or a slab issue. Nadia Ellery founded the studio in 2015, the year California’s ADU permitting rules opened up, and the company has designed, permitted, and built 900+ ADUs since then. Every one, including the garage conversions we’ve done throughout Cypress, had a written price before work started.
Homeowners in Cypress search hard before they call. They’ve read the permit horror stories, the change-order disputes, the “contractor ghosted after demo” reviews. Our documentation is the answer: a complete permit set that names every wind-load rating and foundation detail, a documented photo record on every visit, and a 365-Day Done Right Promise in writing. If the finished ADU is not built to the permitted drawings, we make it right. That clause is in the contract before we start.
We also don’t hide behind a voicemail tree. A live person answers (971) 497-2402 around the clock. If you already have a written estimate from another company, bring it to us. We’ll give you a free second opinion line by line.
Our Garage Conversion ADU Services in Cypress
Our Garage Conversion ADU work in Cypress splits across four sub-services. Each one has different code triggers, different wind-load requirements, and different pricing. Here’s what that looks like on Cypress ground.
Attached Garage Conversion
This is the most common project in Cypress, simply because the housing stock makes it the obvious move. A 1970s attached two-car garage on a slab foundation converts to a one-bedroom ADU with surprising efficiency once you address the slab moisture problem and the electrical panel. In Cypress, attached conversions run $145,000 to $210,000 depending on whether you’re adding a full kitchen, what the existing slab shows during our first site walk, and how much shear wall reinforcement the plan checker requires.
Detached Garage Conversion
Less common in Cypress than attached work, but it does come up in the pockets of larger lots near the western edge of town. A detached conversion costs more per square foot because the structure needs its own service run, often a new subpanel, and independent weatherproofing. Cypress detached conversions typically land between $170,000 and $230,000. Wind-load-rated windows and doors are non-negotiable on these structures.
Carport Conversion
Carport conversions exist in Cypress but are rare compared to garage work. When we do see them, the carport is usually an older enclosure that was never permitted as habitable space. That means the conversion has to be brought up to current code from the studs out, including a new foundation moisture barrier where none exists and full wind-load bracing. Pricing runs $120,000 to $175,000 in Cypress, and the permit path is longer because we’re correcting, not just converting.
Garage Partition & Bathroom Add
This is the pragmatic Cypress move. Keep half the garage as storage and convert the other half into a studio with a bathroom, or split the garage into two zones for multi-generational use. Given Cypress’s substantial Korean-American and Vietnamese-American households that often house aging parents, the partition approach is practical. $90,000 to $140,000 depending on where the sewer line sits and whether we’re tying into existing plumbing or running new.
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.
Trusted Brands We Service in Cypress
We specify and coordinate James Hardie siding, Abodu, and Cover prefab shells under the same single contract so there’s no gap between the modular vendor and the site contractor. For Cypress’s 1960s and 1970s ranch stock, Hardie’s fiber cement panels handle the humidity without warping the way original wood siding does after six decades. Our crews arrive in uniform, background-checked, and the license number appears on the proposal and every page of contract.
Common Garage Conversion ADU Problems We See in Cypress Homes
- No underslab moisture retarder, standard for 1960s Cypress construction. The original garage slab was poured directly on grade with nothing beneath it. Once you frame and insulate, the temperature difference between the conditioned space and the ground drives moisture up through the concrete. Without a vapor barrier or floating subfloor, you get condensation under flooring within the first year, then mold.
- Non-wind-rated windows and unrated garage doors failing the wind-load plan check. Cypress sits in the coastal plain of northwestern Orange County, and the city enforces wind-load ratings on any opening that becomes part of a conditioned space. A cheap quote leaves these out and stalls at plan check.
- Original 100-amp panels that can’t carry the new load. A 1970s Cypress home with a 100-amp service still works fine until you add a kitchen, a mini-split, and laundry circuits to a converted garage. The final electrical inspection fails, and the homeowner is out the cost of a panel upgrade plus the delay.
- Galvanized supply lines with internal corrosion. Most Cypress tract homes were plumbed with galvanized steel. After 50 years, the interior diameter has narrowed so much that the new ADU’s water pressure suffers, and the lines can fail when we cut into them for the conversion tie-in. We replace them when needed and note it on the written scope before work starts.
Pricing for Garage Conversion ADU in Cypress, TX
Let’s put actual numbers on the table for Garage Conversion ADU in Cypress. Attached conversions run $145,000 to $210,000. JADUs run $95,000 to $130,000. Detached conversions run $170,000 to $230,000. A garage partition with bathroom runs $90,000 to $140,000. Those figures include design, permit drawings, a 200-amp panel where required, slab moisture correction, wind-rated windows and doors, all finish work, and the final inspection. They reflect what it actually costs to convert a 1960s or 1970s Cypress garage correctly, not what it costs to get a permit and then chase change orders. Under Haven Standard Clause 1, the price we give you in writing before you sign is the price you pay. We don’t do door-side upsells.
Call (971) 497-2402 and we’ll schedule a site walk. You get a written price, not a verbal estimate.
We Also Serve Cities Near Cypress
Our crews serve Cypress and the surrounding area, including Alief, Spring, Sugar Land, and Houston. The lot geometry and housing age differ from city to city, but the standard doesn’t change: written price before work starts, documented photo record, and a 365-day promise in writing.
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 - Garage Conversion ADU in Cypress
Cypress enforces a wind-load rating of 120 mph on windows, doors, and any garage door that becomes part of the conditioned envelope. Your permit set must name the specific products and their ratings, and the inspector verifies them at the rough and final inspections. We specify rated windows and shear-wall details in every Cypress permit set. Call (971) 497-2402 for a written quote that includes this line item, and check your existing estimate against it.
Because most Cypress garage slabs from the 1960s and 1970s were poured without any underslab moisture retarder, so groundwater moves up through the concrete once the space is conditioned. Current habitable-space code requires a 6-mil vapor barrier under the flooring or a dimple-mat floating subfloor that creates an air gap between slab and floor. We install the vapor barrier and subfloor thermal break as standard on every Cypress conversion, and we write that line into the price. Skip it, and you’re replacing mold-damaged flooring within a year.
Usually not. Adding a kitchen, mini-split, bathroom circuit, and lighting to a converted garage pushes the load well past what a 100-amp panel can safely serve, and the final electrical inspection won’t clear it. We include the panel upgrade to 200 amps in our Cypress pricing when the existing service can’t carry the new load. Call (971) 497-2402 and we’ll confirm during the site walk, then put the upgrade on the written quote.
Your insurer wants proof that the conversion was built to current code, including wind-load ratings on windows and doors, shear wall details, and the final inspection sign-off. We give every client a complete permit set, a photo record on every visit, and the final inspection documentation. That file becomes what you send your insurance company if a claim is ever filed. Built-to-drawing compliance isn’t a marketing claim. It’s Clause 5 of The Haven Standard, and it’s in writing before we start.
Yes, a JADU (junior ADU) is the lighter path in Cypress: up to 500 square feet inside the existing garage footprint, with its own entrance and a bathroom. The wind-load requirements still apply to any new window or door you install, because a JADU is conditioned living space, not a garage. The price difference comes from not adding a full kitchen and from a simpler sewer tie-in. Cypress JADUs typically run $95,000 to $130,000. Call (971) 497-2402 to get a written price for the JADU path versus the full conversion.
Our Cypress Garage Conversion Promise
We’re the only Cypress-specific garage conversion resource that ties the city’s 1960s slab-moisture reality and wind-load code directly to what a compliant quote must include and how that documentation protects your insurance claim. We write it down. We build to the permitted drawings. If we don’t, we fix it under the 365-Day Done Right Promise. That’s the standard, on paper, every time.
To schedule a site walk and get your written price, call (971) 497-2402 today. Live person, no voicemail queue.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Cypress since 2015.
Garage Conversion ADU in Nearby Areas
