ADU Design Resource · Keller, TX
The Complete Guide to
Building an ADU in Keller, TX
Everything Keller homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Permit-ready drawings (more below)
Quick Answers About Keller, TX ADUs
Market Context
Keller has a median home value of $490,000. Adding an ADU typically increases that by 22% — approximately $107,800 in added equity. A 1-bedroom ADU in Keller rents for approximately $1,382/month in the Tarrant County rental market , yielding a 4% cap rate on the investment. Occupancy averages 93% in this market.
Top Keller neighborhoods for ADU investment include North Keller, Hidden Lakes, Brentwood Estates, Forest Lakes Estates, Saddlebrook Estates. Large-lot, high-value single-family neighborhood with strong household incomes and spacious yards suitable for detached ADUs. Premium lots and top-rated schools attract families and renters, and lots are often large enough for detached ADUs.
Permit Process
Permit applications are reviewed by the Community Development — Building Services , with a plan check timeline of approximately 6 weeks. Permit fees in Keller range from $2,000 to $8,000 depending on project scope. Design review: No - ADUs handled through standard building/plan review; design review only applies via Development Review for larger development applications or via private HOA/PD covenants
Keller's Community Development office requires ADUs to match the primary home's masonry percentage — typically 80% brick or stone on exterior walls — which can add $15,000-$25,000 to your build if you were planning a simpler siding exterior. Many Keller neighborhoods also carry deed restrictions through their HOAs that predate the city's ADU allowances, so you'll need title company research or a call to the HOA before assuming your lot qualifies, even if the city itself approves your permit. Because Keller sits partly on well-and-septic lots outside the Fort Worth water service boundary, some homeowners discover mid-process that adding a second dwelling unit triggers a septic system capacity review through Tarrant County Public Health, which can stall permitting for several weeks while an engineer re-evaluates the drain field.
"In my experience working Keller ADU projects, that 6-week plan check timeline and $300/sqft build cost are both state-level estimates that rarely survive contact with a real submittal or a real bid — incomplete drawing sets alone can add several weeks to the review. I'd call Community Development — Building Services directly to confirm current queue times, and get at least two local contractor quotes before you anchor your budget to that per-square-foot number. — Charlotte Pemberton, Senior ADU Design Consultant"
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Keller's building department records and current 2026 Texas's local zoning ordinances.
Property Eligibility
Is My Keller, TX Property Eligible for an ADU?
Keller homeowners are governed by Texas's local zoning ordinances — Texas has no statewide ADU-approval law. Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Keller under Texas's local zoning ordinances — Texas has no statewide ADU-approval law. No owner-occupancy requirement in Keller — you can rent both units as investment properties. Review process and timelines are set entirely by local ordinance — confirm the current process with the Community Development — Building Services before designing.
Multi-Family Property
Additional ADUs on multi-family and duplex lots may qualify under Texas's local zoning ordinances — Texas has no statewide ADU-approval law — the exact number and type allowed depends on Keller's local rules. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 30% of Keller homes are in an HOA. Texas has no statute limiting HOA power over ADUs — HOAs can restrict or ban ADUs and short-term rentals through their covenants (Texas Property Code Ch. 202/204/209). Our drawings include HOA submission formatting.
Always verify eligibility with Community Development — Building Services before designing.
Free — No Obligation
Will Keller Approve an ADU on Your Lot?
Send us the address and we’ll check it against Keller’s current zoning, setbacks, and lot-coverage rules — then tell you honestly whether to proceed. Free, and no payment is taken unless your property qualifies.
- ✓Lot qualification against current Keller code
- ✓Your buildable envelope — setbacks and maximum footprint
- ✓Realistic rental income and payback estimate
- ✓Financing pathways you’d likely qualify for
- ✓A straight GO / NO-GO answer within 48 hours
Check My Property — Free
Takes 60 seconds. We'll deliver your personalized report within 48 hours.
Request Received
Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
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Keller ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Keller construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. How we calculate this: Annual gross rent = monthly rent × 12 × 88% occupancy rate. Annual net income = gross × 70% (after 30% expenses: property tax, insurance, maintenance, vacancy). Value added = median home value × 22% uplift (regional ADU comparables). Total return = net income × years + value added. Break-even = total build cost ÷ annual net income. Consult a licensed financial advisor before investing.
Data sources: Community Development — Building Services (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-07-12.
Local Market Data
Top Keller Neighborhoods for ADU Investment
North Keller
Large-lot, high-value single-family neighborhood with strong household incomes and spacious yards suitable for detached ADUs.
Hidden Lakes
Premium lots and top-rated schools attract families and renters, and lots are often large enough for detached ADUs.
Brentwood Estates
High median values and large estate lots make it ideal for luxury in-law or rental ADU builds.
Forest Lakes Estates
Estate-style lots and higher price point support detached ADUs for family or short-term rental income.
Saddlebrook Estates
Established single-family neighborhood with sizeable lots and incomes that support premium ADU construction.
Highland Oaks
Well-located, family-oriented neighborhood with yards and good schools—good for accessory dwellings for family or rental.
Quail Valley Estates
Single-family homes on moderately large lots in a stable market that can support detached ADUs for rental demand.
Chase Oaks
Spacious yards and proximity to parks and community amenities make ADUs attractive to homeowners and renters.
Bear Creek Park
Close to Keller amenities and parks with many single-family parcels that can accommodate accessory buildings.
Parkwood
Moderate-priced single-family neighborhood where ADUs can be a strong rental or multigenerational housing play.
Keller ADU Market at a Glance
Local Zoning Rules
2026 Keller ADU Rules
Keller's 2026 ADU ordinance caps new units at 1,200 sq ft — in the typical range most ADU floor plans are designed around. Setbacks run 5 ft side and 5 ft rear, close to the regional baseline. Keller doesn't trigger the extra engineer-stamp requirement we see in higher seismic-risk or hurricane-code cities — a standard code-compliant ADU under the size cap can typically be designed and submitted without an architect or engineer stamp, though any load-bearing change to the existing house still needs one.
Permit fees run $2,000–$8,000 — in line with what most homeowners budget for permitting, and plan check takes about 6 weeks at Community Development — Building Services. Submit directly to the department online — link below.
| Regulation | Keller Allowance |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Max Height | 16 ft (detached) |
| Side Setback | 5 ft |
| Rear Setback | 5 ft |
| Architect / Engineer Stamp | Not required under the size cap* |
| Owner Occupancy | Set by local ordinance |
| Short-Term Rental | Check local ordinance |
| Coastal Overlay | Parcel-dependent |
| Design Review | No - ADUs handled through standard building/plan review; design review only applies via Development Review for larger development applications or via private HOA/PD covenants |
| HOA Prevalence | 30% of properties |
| Permit Fees | $2,000–$8,000 |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-07-12T23:00:00.000Z. Always confirm with the Community Development — Building Services before designing.
Keller Permit Process
Keller ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on regional averages. Actual Keller data coming soon.
Local Financing Resources
Local ADU Lenders in Keller
These lenders offer HELOC, construction, and renovation loans for ADU projects in Tarrant County. Compare terms before committing.
Offers home equity loans with terms up to 30 years and borrowing up to 80% of home value.
Visit Lender ↗Provides fixed-rate home equity loans up to $250,000 with a maximum 80% LTV.
Visit Lender ↗Offers specialized home improvement loans that can be secured by home collateral or unsecured.
Visit Lender ↗Provides customized home construction loans for renovation or purchase with one-time closing.
Visit Lender ↗A fintech that partners with credit unions to provide high-LTV renovation underwriting for ADUs.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Keller
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Keller ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Community Development — Building Services.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
Quoted on your free call
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Community Development — Building Services. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Keller ADU Package
Engineered for TX Permit Approvals
What You Get
Keller ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Keller:
| Service Type | Typical Cost | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Standard | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Premium | Quoted on your free call | 5 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓local energy code form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Keller ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. One flat fee — about what an architect charges just to start. Yours would rent around $1,382/mo.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Keller's building department requirements and TX code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Community Development — Building Services. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three representative project scenarios based on actual drawing packages delivered in Texas cities with similar market conditions to Keller.
Build costs reflect local construction data for Keller. Client names are initials only. Permit timelines are project-specific and may vary.
"Permit approved on the first submittal. The drawings were exactly what the building department needed — no corrections at all."
"We converted our two-car garage in under 6 months. Drawings were ready in 10 days — faster than any local firm we contacted."
"The JADU drawings included everything the city required. Submitted day 11, approved six weeks later. Tenant moved in two months after that."
Representative scenarios. Build costs modeled using Keller construction data (city-verified data) and Community Development — Building Services. Outcomes vary by project scope and site conditions.
Building Code
Keller Climate Zone & Energy Code
Texas Energy Code (2018 International Energy Conservation Code): Keller enforces the 2018 IECC for residential construction, requiring ADUs to meet specific building thermal envelope, HVAC, and lighting efficiency provisions.
Compare Cities
Keller vs. Nearby Texas Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Eligibility |
|---|---|---|---|---|---|
| Keller ← you | $300 | $2,000+ | $1,382/mo | 4% | Free check → |
| Fort Worth | $200 | $2,000+ | $1,254/mo | 6.8% | View → |
| Arlington | $250 | $2,000+ | $1,118/mo | 6.8% | View → |
| North Richland Hills | $220 | $1,478+ | $1,250/mo | 5.5% | View → |
| Mansfield | $375 | $14,720+ | $1,404/mo | 6.8% | View → |
Frequently Asked
Keller ADU Questions
How much does it cost to build an ADU in Keller? +
What is the maximum ADU size allowed in Keller? +
How long does the ADU permit process take in Keller? +
Do I need owner-occupancy to build an ADU in Keller? +
What's the rental income potential for an ADU in Keller? +
How much does it cost to get ADU drawings in Keller? +
What drawings are required for an ADU permit in Keller? +
Can I convert my garage to an ADU in Keller? +
What neighborhoods in Keller are best for ADU investment? +
Is Keller ADU-friendly? +
How much will an ADU increase my property value in Keller? +
Does Keller's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Keller? +
More Services in Keller
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