ADU in Irving, TX
ADU Design & Permitting in Irving starts with a hard look at what the city will approve, because Irving’s zoning department has historically been more conservative than most Metroplex suburbs on accessory dwellings. Most Irving properties we assess are 1960s to 1980s ranch homes on concrete slabs with 100-amp electrical panels, which means the permit path almost always includes a panel evaluation and often an upgrade before the ADU plans clear review. If you’re weighing an ADU on your Irving lot, call (971) 497-2402 and we’ll walk you through what your specific property can support, in writing, before you spend a dollar.
Why Irving Homes Are Different
Irving sits on North Texas’s expansive black-clay soil, and that single fact reshapes every detached ADU foundation we design here. The clay shrinks hard during summer droughts and heaves after rain, so a backyard ADU slab needs engineered piers driven 10 to 12 feet deep, far beyond what a standard residential slab requires elsewhere. Homeowners in the Heritage District, Hackberry Creek, and older Valley Ranch sections often hear foundation bids that sound high until they see what the soil actually demands.
The housing stock compounds the challenge. Irving’s residential core is dominated by ranch-style tract homes on 7,000 to 9,000 square foot lots, typically with detached single-car garages that make natural conversion candidates. But these homes routinely carry 100-amp electrical panels and aging cast-iron or early-PVC sewer laterals. Before a second dwelling unit can be added, both systems often need evaluation and upgrades. Summers that regularly exceed 100°F add another layer: an ADU’s HVAC must be sized independently, because the main home’s unit almost never has surplus capacity to share.
Our Main Irving Services
Two ADU paths account for most of the calls we receive from Irving homeowners, and each follows a different permitting route through the city.
Garage Conversion ADU in Irving
Irving’s detached single-car garages on concrete slabs are textbook conversion candidates, especially in the Heritage District and older Valley Ranch sections where garage footprints are compact but structurally straightforward. The catch is usually the slab itself: many were poured as non-structural parking slabs, and the city will require verification that the concrete can bear living-space loads before approving the change of use. We also check the sewer lateral at the same time, since Irving’s aging cast-iron lines frequently need replacement before the conversion can pass inspection. For the full picture on converting a garage in Irving, see Garage Conversion ADU in Irving.
New Detached ADU in Irving
A new detached ADU in Irving gives you full control over layout and finishes, but the foundation work is more involved here than in most Texas cities. The black-clay soil requires engineered piers at 10 to 12 feet, and if your lot falls within a FEMA Special Flood Hazard Area near the Elm Fork of the Trinity River or its tributaries, you’ll need an elevation certificate and floodplain development review before a building permit can issue. That review adds months in some Irving neighborhoods, so we start the paperwork on day one. Details on the full build path are on our New Detached ADU in Irving 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 Irving
ADU Design & Permitting in Irving is where projects stall most often, and the reasons are local. The city’s zoning department has historically been among the more conservative in the Metroplex on accessory dwellings, even as demand from DFW Airport and Las Colinas workers has surged. A permit set drawn for another city will not clear Irving review without revisions tied to the city’s setbacks, lot coverage, and floodplain requirements. Our ADU Design & Permitting process starts with the documents Irving actually requires, not a generic template.
Site Assessment
Signs you need it
You own an Irving lot and want to know, in writing, what size and placement of ADU the city will approve before you spend money on drawings.
What it costs in Irving
Site assessment for an ADU in Irving typically runs $450 to $950, depending on lot size, floodplain status, and whether soil testing is required.
How we do it
We measure the lot, review Irving zoning overlays and flood maps, test soil where a detached ADU is planned, and deliver a written feasibility summary with buildable area and constraints.
Permit Application
Signs you need it
Your plans are drawn and you need a submission package that Irving’s building department will accept without a first-round rejection for missing documentation.
What it costs in Irving
Full permit application preparation for an ADU in Irving typically runs $3,000 to $7,000, covering drawings, structural review, floodplain paperwork if required, and submission management.
How we do it
We assemble the permit set, elevation certificates where flood zones apply, structural calculations, and Title 24 energy documents, then manage the submission and respond to every plan review comment until the permit issues.
What ADU Design & Permitting Costs in Irving
| Item | Typical range in Irving |
|---|---|
| Site assessment | $450 - $950 |
| Permit application preparation | $3,000 - $7,000 |
| Full design and permit set | $8,000 - $20,000 |
Does Irving require a floodplain review before an ADU permit?
Yes, if your lot falls within a FEMA Special Flood Hazard Area near the Elm Fork of the Trinity River or its tributaries. You’ll need an elevation certificate and floodplain development review before the building permit can issue, which can add months.
How long does ADU permitting take in Irving?
Expect 3 to 6 months from submission to issued permit for a typical detached ADU in Irving, longer if floodplain review applies or the zoning department requests revisions. A complete, accurate permit set is the single biggest lever on timeline.
Junior ADU & Interior Conversion in Irving
A Junior ADU or interior conversion in Irving turns existing square footage into a rentable unit without touching the foundation, which sidesteps the black-clay soil work entirely. That’s a meaningful advantage on Irving’s expansive clay, where a new detached slab can add tens of thousands in pier work. Our Junior ADU & Interior Conversion process covers attached conversions, garage-to-JADU work, and room-to-unit reconfigurations that Irving’s zoning code can accommodate.
Attached Addition ADU
Signs you need it
Your Irving home has an attached space, like a converted den with its own entry, that you want legally recognized as a separate dwelling unit through the city.
What it costs in Irving
An attached addition ADU in Irving typically runs $120,000 to $220,000 all-in, depending on finish level, kitchen and bath scope, and whether the electrical panel needs upgrading.
How we do it
We verify the existing structure against Irving’s building code, design the separation and utility connections, pull permits, and build to the approved drawings.
Interior JADU
Signs you need it
You have a spare bedroom or finished space inside your Irving home and want a compact, code-compliant rental unit without adding any square footage.
What it costs in Irving
An interior JADU in Irving typically runs $60,000 to $120,000, covering the kitchenette, bath, and separate entry requirements the city mandates.
How we do it
We design the unit to Irving’s JADU standards, separate the utilities where required, build the kitchen and bath, and document the work for final inspection.
What Junior ADU & Interior Conversion Costs in Irving
| Item | Typical range in Irving |
|---|---|
| Interior JADU | $60,000 - $120,000 |
| Attached addition ADU | $120,000 - $220,000 |
| Electrical panel upgrade | $3,000 - $6,000 |
Can I convert my attached garage into a JADU in Irving?
Yes, attached garage conversions are common in Irving, but the city will require verification that the slab can bear living-space loads and that the conversion meets the code requirements for a separate dwelling unit. Existing cast-iron sewer lines often need replacement at the same time.
Does a JADU in Irving need its own electrical panel?
Not necessarily, but Irving’s building department will review the load calculation. Many 1960s to 1980s ranch homes in Irving have 100-amp panels that cannot support a second unit without an upgrade, which adds $3,000 to $6,000.
ADU Site Prep & Utilities in Irving
ADU Site Prep & Utilities in Irving carries more weight than in most cities because the soil and the housing stock both work against you. Expansive black clay requires engineered piers, and Irving’s older neighborhoods routinely have 100-amp panels and cast-iron sewer laterals that were never designed for a second dwelling. Our ADU Site Prep & Utilities work covers everything from foundation to final utility connection, under the same written price.
Foundation & Grading
Signs you need it
You’re adding a detached ADU in Irving and need a foundation that won’t crack or heave as the black-clay soil expands and contracts through North Texas seasons.
What it costs in Irving
Foundation and grading for an ADU in Irving typically runs $25,000 to $45,000, driven by engineered piers at 10 to 12 feet depths that the local soil demands.
How we do it
We run soil tests, design the pier depths to Irving’s expansive clay conditions, excavate, form, and pour, then document the work photographically for the permit record.
Electrical Panel Upgrade
Signs you need it
Your Irving home still has a 100-amp panel and the ADU will add a second living unit’s worth of load to a system that was sized for a single 1960s household.
What it costs in Irving
An electrical panel upgrade for an ADU in Irving typically runs $3,000 to $6,000 for a 200-amp replacement, including the disconnect and labeling the city requires.
How we do it
We coordinate with Oncor, replace the panel, run the feeder to the ADU, and pass the city’s electrical inspection with documentation in hand.
What ADU Site Prep & Utilities Costs in Irving
| Item | Typical range in Irving |
|---|---|
| Foundation and grading | $25,000 - $45,000 |
| Electrical panel upgrade | $3,000 - $6,000 |
| Sewer lateral replacement | $4,000 - $9,000 |
Do I need to replace my sewer lateral for an ADU in Irving?
Often yes. Irving’s 1960s to 1980s ranch homes frequently have cast-iron or early-PVC laterals that are deteriorating or undersized for a second unit’s flow. The city will require a lateral inspection before the ADU permit clears, and replacement typically runs $4,000 to $9,000.
Why are ADU foundations so expensive in Irving?
The expansive black-clay soil requires engineered piers driven 10 to 12 feet deep, far exceeding standard slab footings. This is the single largest foundation cost driver in Irving, and it is non-negotiable if you want a detached ADU that does not heave or crack.
Brands We Service in Irving
Irving homeowners often ask about prefab and modular systems, and we specify and coordinate Abodu, Cover, and James Hardie products within our single contract. Parts for these systems are ordered through our Dallas-Fort Worth office, and a live person answers calls 24/7 to track orders. See our brands for the full list.
Pricing for ADU in Irving, TX
| Service | Typical range in Irving |
|---|---|
| Site assessment | $450 - $950 |
| Permit application preparation | $3,000 - $7,000 |
| Full design and permit set | $8,000 - $20,000 |
| Interior JADU | $60,000 - $120,000 |
| Attached addition ADU | $120,000 - $220,000 |
| Foundation and grading | $25,000 - $45,000 |
| Electrical panel upgrade | $3,000 - $6,000 |
| Sewer lateral replacement | $4,000 - $9,000 |
What pushes an ADU price up in Irving more than most cities is the soil: engineered piers at 10 to 12 feet add tens of thousands to any detached build. Every price above is covered by our written-price guarantee under Haven Standard Clause 1, so the figure you approve before work starts is the figure you pay at final inspection.
Neighborhoods We Serve in Irving
We work across Irving’s residential core and the surrounding subdivisions, and our crews are typically on site within a week of permit issuance for most ADU projects in the area.
- Heritage District
- Hackberry Creek
- Valley Ranch
- Las Colinas
- University Hills
Service Area - Cities Near Irving
While this page focuses on Irving, our design-build work extends across the metro. We also serve Dallas, TX, Mesquite, TX, Lancaster, TX, and Duncanville, TX, with the same written-price guarantee and documented photo record on every visit.
Serving Irving, TX - Our Local Coverage Area
We’re based in the Irving 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 Irving
Site assessment and design typically begin within two weeks of your written approval. Permitting itself runs 3 to 6 months in Irving, and we cannot shorten the city’s review calendar, but a complete and accurate permit set prevents the avoidable delays that come from plan review rejections.
Some do. The Heritage District and certain Valley Ranch subdivisions have active HOAs with their own rules on rentals, exterior materials, and setbacks, independent of city zoning. We review your HOA covenants during site assessment so you know every restriction before drawings start.
Yes, but the path is longer. Lots near the Elm Fork of the Trinity River or its tributaries require an elevation certificate and floodplain development review before a building permit issues. We handle that paperwork as part of the permit application, and it does not change our written-price guarantee.
Ready to find out what your Irving property can support? Call (971) 497-2402 and we’ll schedule a site assessment with a written feasibility summary, priced before any work begins.
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 Irving Customers Say
"Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."Handled the whole planning process. We went to one hearing and that was it."
- Rowena C."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D.