ADU in Schertz, TX
An ADU in Schertz, TX typically starts with a design and permitting package that runs $18,000-$32,000 before construction begins, and the single biggest variable is the black clay soil under your lot. Schertz sits in a corridor where post-tension slabs and pier systems are the norm, not the upgrade, because the ground shrinks through 100°F summers and heaves when the rains return. That reality changes foundation engineering, drainage design, and timeline, which is why we start every Schertz project with a written site assessment and a permit set, not a brochure. Call (971) 497-2402 when you’re ready to see real numbers for your address.
Why Schertz Homes Are Different
Schertz is not one permitting jurisdiction, and that fact catches more homeowners than anything else. The city limits cross Guadalupe, Bexar, and Comal counties unevenly, so a house in one part of a subdivision may fall under Schertz’s building department while a neighbor two lots over answers to unincorporated Guadalupe County. Confirming the exact jurisdictional address is the non-negotiable first step before any ADU design work begins, because the permit path, inspection schedule, and fee structure change completely across those lines.
The housing stock matters too. Most Schertz ADU projects happen on 1990s-2010s tract home lots in planned subdivisions like Northcliffe, along the Schertz Parkway corridor, and in newer builds toward Cibolo Creek Ranch. Those lots run 7,000-10,000 square feet, which is room for a detached cottage in many cases, but HOA deed restrictions often operate independently of city permits. We have seen HOA architectural review committees take longer than the city plan check, and we plan for that from the first site visit.
Then there is the soil. The expansive black clay across the San Antonio northeast corridor moves enough through a Schertz summer to crack a conventional slab, so ADU foundations here almost always require post-tension engineering or deep piers. That is a line item, not a surprise, when you are working with a design-build studio that prices the full scope up front.
Our Main Schertz Services
Schertz homeowners call us most often about two projects: converting an existing garage into a rentable unit, and building a new detached ADU in the backyard. Both start with the same written process, and both are affected by the same local conditions.
Garage Conversion ADU in Schertz
A garage conversion turns the existing footprint into a permitted dwelling unit, which often means reinforcing the slab, adding insulation, running new electrical, and bringing the whole structure up to current code. On Schertz lots with HOA restrictions against new detached structures, this is frequently the fastest compliant path to rental income. The existing concrete usually works, but the clay soil underneath still matters when we open up the floor for plumbing. See the full scope on our Garage Conversion ADU in Schertz page.
New Detached ADU in Schertz
A new detached ADU gives you a freestanding unit sized to the setback requirements of your specific lot and jurisdiction. In Schertz, that means designing for a post-tension or pier foundation, routing utilities across the yard, and navigating HOA review where it applies. The payoff is a fully separate rental or family unit that does not compete with the main house. We cover the design, permit set, and build in one contract on our New Detached ADU in Schertz page.
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.
ADU Design & Permitting in Schertz
ADU Design & Permitting in Schertz is where most projects are won or lost. The first job is establishing exactly which jurisdiction governs your address, because Schertz city limits do not follow county lines, and a permit application filed in the wrong building department costs weeks. The second job is engineering the structure for the expansive clay soil that defines this corridor, which means the plans reflect post-tension or pier foundation requirements from day one. We handle the full ADU Design & Permitting scope inside one contract, so the drawings, the permit set, and the construction are the same written price, not three separate invoices.
Site Assessment
Signs you need it
You have a lot size in mind but no soil report, no survey, and no clear answer on which jurisdiction actually controls your address.
What it costs in Schertz
A site assessment for an ADU in Schertz typically runs $1,800-$4,500, including the survey, soil analysis, and a written feasibility memo for your specific lot.
How we do it
We pull the survey, take soil samples, confirm the governing jurisdiction, and walk the lot with you to map setbacks, utilities, and access before any drawings begin.
Permit Application
Signs you need it
You have plans or an estimate from another source but no permit set submitted, no plan check feedback, and no clarity on fees.
What it costs in Schertz
Permit application and plan check for a Schertz ADU typically runs $2,000-$5,500, depending on jurisdiction and whether HOA review runs in parallel.
How we do it
We prepare the full permit set, submit to the correct building department, track comments, and handle resubmissions until the permit is issued.
HOA & Zoning Compliance
Signs you need it
Your subdivision has a deed restriction, an architectural review committee, or setback language that conflicts with what you want to build.
What it costs in Schertz
HOA and zoning compliance work for a Schertz ADU typically runs $1,200-$3,000, including the application package, hearing prep, and variance language where needed.
How we do it
We pull the deed restrictions, prepare the HOA submittal, coordinate with the architectural review committee, and lock the zoning determination before design begins.
What ADU Design & Permitting Costs in Schertz
| Item | Typical range in Schertz |
|---|---|
| Site Assessment (survey, soil, feasibility) | $1,800-$4,500 |
| ADU Design & Blueprints (full permit set) | $8,000-$16,000 |
| Permit Application & Plan Check | $2,000-$5,500 |
Does Schertz require HOA approval before I can permit an ADU?
Yes, often. City permits and HOA deed restrictions are separate approval tracks, and in Schertz subdivisions like Northcliffe, the HOA architectural review committee can block a design the city would approve. We pull the deed restrictions first and build the design around both layers.
Will the permit drawings match the finished ADU?
Yes. Under our 365-Day Done Right Promise, if the finished ADU is not built to the permitted drawings, we make it right, in writing, before the project starts. Your permit set is the construction scope, not a suggestion. Call (971) 497-2402 to start with a site assessment.
Junior ADU & Interior Conversion in Schertz
Junior ADU & Interior Conversion in Schertz is the path for homeowners who want a rentable unit without adding a new structure to the lot. The 1990s-2010s tract homes that dominate Schertz often have underused space, a bonus room, a large primary suite, or an attached garage with a finished ceiling that can convert cleanly into a permitted JADU. The local constraint is usually the HOA, not the house, and we run the deed restriction check as the first step on every Junior ADU & Interior Conversion project so the design does not fight the HOA rules later.
Above-Garage ADU
Signs you need it
You have an attached garage with a bonus room above it that is already framed but never permitted as living space.
What it costs in Schertz
An above-garage ADU conversion in Schertz typically runs $25,000-$55,000, including insulation, egress, electrical, and a separate entry.
How we do it
We verify the structure, add the required egress and separation, upgrade electrical and insulation, and bring the space to permitted living status under current code.
Room-to-ADU Conversion
Signs you need it
You have a primary suite, den, or bonus room with its own entrance or the space to add one, and you want a permitted rental unit inside the existing footprint.
What it costs in Schertz
A room-to-ADU conversion in Schertz typically runs $40,000-$85,000, depending on whether you need a kitchenette, a separate entry, or a private bath added.
How we do it
We add the kitchenette or wet bar, create the separate entry, separate utilities where required, and run the new electrical and plumbing through the permit set and inspection.
Interior JADU
Signs you need it
You want a compact, fully permitted junior unit attached to or within the main house, with a separate cooking capacity and a private entrance or shared entry.
What it costs in Schertz
An interior JADU in Schertz typically runs $30,000-$70,000, with the final number driven by kitchen scope, entry configuration, and whether the panel can carry the load.
How we do it
We convert an existing room or wing, add the required kitchenette and bath, create the separate entrance, and file the JADU permit with the correct jurisdiction for your address.
What Junior ADU & Interior Conversion Costs in Schertz
| Item | Typical range in Schertz |
|---|---|
| Above-Garage ADU Conversion | $25,000-$55,000 |
| Room-to-ADU Conversion | $40,000-$85,000 |
| Interior JADU | $30,000-$70,000 |
Can I rent out a JADU in Schertz if my HOA says no rentals?
Usually not. HOA covenants that prohibit or restrict rentals apply to JADUs the same as to the main house, and Schertz HOAs are more aggressive on this than most buyers expect. We pull the full deed restrictions in writing before design starts.
Will a JADU conversion require a separate electrical meter in Schertz?
Not in every case. The meter requirement depends on your jurisdiction and utility provider, and on whether the unit has its own kitchen. We confirm the exact meter requirement for your address in writing before pricing the panel scope. Call (971) 497-2402 for an exact quote with the JADU scope locked.
ADU Site Prep & Utilities in Schertz
ADU Site Prep & Utilities in Schertz is the part of the project where the black clay soil stops being someone else’s problem and becomes a line item on your written estimate. The shrink-swell cycle through Schertz’s 100°F summers and wet winters means almost every detached ADU here needs a post-tension slab or deep piers, and that decision drives the grading, drainage, and utility trench plan. We run the full ADU Site Prep & Utilities scope inside the same single contract, so the foundation engineer and the utility crew work from one set of drawings, one price, and one accountable team.
Foundation & Grading
Signs you need it
Your lot has expansive clay, visible cracking in the main home’s slab, or drainage that pools near the proposed ADU footprint after rain.
What it costs in Schertz
Foundation and grading for a Schertz ADU typically runs $12,000-$28,000, with post-tension engineering and pier depth driving the range.
How we do it
We bring in a geotechnical engineer, design the slab or pier system for the soil report, grade for positive drainage, and form and pour to the approved plans.
Electrical Panel Upgrade
Signs you need it
Your main panel is full, your service is 100 amps or less, or the ADU will run an electric range, HVAC, or a dryer.
What it costs in Schertz
An electrical panel upgrade for a Schertz ADU typically runs $3,000-$8,000, depending on whether you need a subpanel, a service upgrade, or a new feeder run.
How we do it
We load-calculate the ADU, specify the panel and feeder size in the permit set, pull the electrical permit, and complete the panel upgrade and rough-in.
Plumbing Lateral
Signs you need it
Your ADU needs a new sewer connection, the existing lateral is too shallow, or the city requires a separate cleanout at the ADU.
What it costs in Schertz
A plumbing lateral for a Schertz ADU typically runs $2,500-$7,000, depending on the distance to the main sewer line and the trench depth through clay.
How we do it
We locate the existing lateral, excavate to the required depth, run the new sewer line, install the cleanout, and backfill with compacted material per city spec.
What ADU Site Prep & Utilities Costs in Schertz
| Item | Typical range in Schertz |
|---|---|
| Foundation & Grading | $12,000-$28,000 |
| Electrical Panel Upgrade | $3,000-$8,000 |
| Plumbing Lateral | $2,500-$7,000 |
Does every Schertz ADU need a post-tension foundation?
Almost every detached ADU on Schertz’s expansive clay does. The soil movement through a single summer is enough to crack a conventional slab, so we specify post-tension or piers from the first drawings. Your written price includes the geotech report, not just the pour.
Will the utility trench damage my yard?
It will disturb it, yes. We trench along the agreed path, backfill with compacted material, and document the condition before and after, but the disturbed area will need re-sodding or landscaping once the ground settles. Call (971) 497-2402 to get the full site prep scope priced in writing.
Brands We Service in Schertz
We specify and coordinate prefab and modular systems from James Hardie, Abodu, Cover, and Dvele within the same single contract, so the factory components and the site work are one accountable scope. We stock common James Hardie siding and trim locally for Schertz jobs, and we order the prefab modules with lead times built into your schedule. See our brands page for the full list.
Pricing for ADU in Schertz, TX
| Service | Typical range in Schertz |
|---|---|
| Site Assessment | $1,800-$4,500 |
| ADU Design & Blueprints | $8,000-$16,000 |
| Permit Application & Plan Check | $2,000-$5,500 |
| HOA & Zoning Compliance | $1,200-$3,000 |
| Above-Garage ADU Conversion | $25,000-$55,000 |
| Room-to-ADU Conversion | $40,000-$85,000 |
| Interior JADU | $30,000-$70,000 |
| Foundation & Grading | $12,000-$28,000 |
| Electrical Panel Upgrade | $3,000-$8,000 |
| Plumbing Lateral | $2,500-$7,000 |
What pushes the price up in Schertz is the soil: post-tension slabs and pier foundations cost more than conventional work in stable ground, and every detached ADU here needs one or the other. What does not push the price up is surprises, because under Haven Standard Clause 1, your written price covers the full scope before any work begins, and no change order appears mid-project without your signed approval.
Neighborhoods We Serve in Schertz
We work across the Schertz city limits and the unincorporated pockets that share the same lots, soil, and HOA realities. Our San Antonio office coordinates scheduling for all Schertz crews, and we keep a written photo record on every visit, from first site walk to final inspection.
- Northcliffe
- Schertz Parkway corridor
- Cibolo Creek Ranch
- Ashley Place
- Belmont Park
Service Area - Cities Near Schertz
Beyond Schertz, we run the same design-build process in Cibolo, TX, San Antonio, TX, San Marcos, TX, and Kyle, TX. Each city has its own permit desk, soil profile, and HOA landscape, and we build the written price around the specific jurisdiction from day one.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz 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 About ADU in Schertz
The fastest way is to pull the official jurisdiction lookup for your exact address, because Schertz crosses Guadalupe, Bexar, and Comal counties unevenly. The permit path, fee schedule, and inspection process change completely across those lines. We confirm jurisdiction in writing as step one on every Schertz project, before any design work is priced.
Yes, and more often than city permits do. Many Schertz subdivisions have deed restrictions that run independent of city ADU allowances, and the architectural review committee can take longer than the city plan check. We pull the full deed restrictions before design begins so the plan never fights a rule we already know about.
Will you give me a written price before any work starts?
Yes. Under Haven Standard Clause 1, every Schertz project is quoted with a written price before any work begins, no exceptions. You will see the full scope, the permit set, the foundation approach, and the utilities plan in one document, and that number is the number. Call (971) 497-2402 to start with a written site assessment.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Schertz Customers Say
"The rental income has covered the payment since the second month. They were realistic about the numbers rather than optimistic."
- Odette N."They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
- Mireille T."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H.