ADU Design Resource · Sherman, TX
The Complete Guide to
Building an ADU in Sherman, TX
Everything Sherman 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 Sherman, TX ADUs
Market Context
Sherman has a median home value of $280,000. Adding an ADU typically increases that by 25% — approximately $70,000 in added equity. A 1-bedroom ADU in Sherman rents for approximately $903/month in the Grayson County rental market , yielding a 6% cap rate on the investment. Occupancy averages 91% in this market.
Top Sherman neighborhoods for ADU investment include Heritage Ranch, Canyon Creek Estates, Bel Air Village, Oaks of O'Hanlon Ranch, Pebblebrook / The Grove. Newer subdivision with large lots (12,000+ sq ft) and high single-family density, plus strong family-rental demand tied to nearby Texas Instruments semiconductor fab and Carrus Hospital job growth. Estate-style homes on oversized lots exceeding the city's 12,000 sq ft ADU minimum, with proximity to US-75 and Austin College driving consistent rental demand.
Permit Process
Permit applications are reviewed by the Development Services . Permit fees in Sherman range from $350 to $600 depending on project scope. Design review: Yes - in historic districts only
Sherman's Development Services will treat your ADU as a separate accessory structure for utility purposes, which often means running a new water tap and sewer tap from the street rather than just extending your existing home's lines — a cost that can add $3,000-$6,000 depending on where your main line sits on the lot. Because Sherman doesn't allow the unit to be rented short-term, the city cross-checks the address against active STR listings during final inspection, so if you're counting on Airbnb income to justify the build, that plan won't clear approval. Also, older Sherman neighborhoods near the historic core often have platted alleys that Grayson County still considers the legal access point, which can force your ADU's driveway or garage orientation in a direction your site plan didn't anticipate.
"In my 11 years handling Sherman ADU permits, I've noticed that both the timeline and cost-per-square-foot figures here are blank or missing entirely, which tells me they're likely state-level placeholders rather than numbers pulled from actual Sherman Development Services data or local contractor bids — I wouldn't build a budget or schedule around them. My honest advice: call Development Services directly for their current plan check queue and get at least two local contractor quotes before you commit to a start date, since even "clean" submittals here often pick up a correction round or two that adds real weeks to the process."
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Sherman's building department records and current 2026 Texas's local zoning ordinances.
Property Eligibility
Is My Sherman, TX Property Eligible for an ADU?
Sherman 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 Sherman under Texas's local zoning ordinances — Texas has no statewide ADU-approval law. No owner-occupancy requirement in Sherman — you can rent both units as investment properties. Review process and timelines are set entirely by local ordinance — confirm the current process with the Development 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 Sherman's local rules. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 21% of Sherman 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.
Historic Districts
Yes - in historic districts only
Always verify eligibility with Development Services before designing.
Free — No Obligation
Will Sherman Approve an ADU on Your Lot?
Send us the address and we’ll check it against Sherman’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 Sherman 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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Sherman ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Sherman 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 × 25% 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: Development Services (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-08-15.
Local Market Data
Top Sherman Neighborhoods for ADU Investment
Heritage Ranch
Newer subdivision with large lots (12,000+ sq ft) and high single-family density, plus strong family-rental demand tied to nearby Texas Instruments semiconductor fab and Carrus Hospital job growth.
Canyon Creek Estates
Estate-style homes on oversized lots exceeding the city's 12,000 sq ft ADU minimum, with proximity to US-75 and Austin College driving consistent rental demand.
Bel Air Village
Established SFH neighborhood with generously sized lots ideal for detached ADUs, well-positioned for commuter demand from Sherman's expanding tech and manufacturing sector.
Oaks of O'Hanlon Ranch
Spacious modern homes on large platted lots with strong appeal to young families renting while working at Texas Instruments' new Sherman fab campus.
Pebblebrook / The Grove
Growing suburban pocket with newer detached single-family homes and ample rear-yard space, ideal for a backyard ADU serving the booming local rental market.
West Sherman (Central/West)
Older central neighborhood near downtown employers and Austin College: lower-cost older SFHs on large legacy lots are prime candidates for detached ADU conversions.
College District (near Austin College)
Walking distance to Austin College creates persistent student and faculty rental demand, and many single-family lots exceed the 12,000 sq ft threshold for an ADU.
North Sherman
More affordable SFH stock with roomy lots, offering lower entry-cost ADU projects to capture spillover demand from the Texas Instruments semiconductor expansion.
Southeast Sherman (near Carrus Hospital)
Proximity to Carrus Hospital (650 employees) and Sherman Medical Center drives strong nurse and technician rental demand from professionals seeking housing near work.
South Sherman / Travis Street Corridor
Mixed older SFH fabric close to downtown Sherman and government employers (City of Sherman 606 employees), with many in-fill lots that can accommodate a compliant detached ADU.
Sherman ADU Market at a Glance
Local Zoning Rules
2026 Sherman ADU Rules
Sherman'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. Sherman 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 $350–$600 — notably inexpensive compared to most cities we cover through Development Services. Submit directly to the department online — link below.
| Regulation | Sherman Allowance |
|---|---|
| Max ADU Size | Set by local ordinance (no TX state cap) |
| Max Height | 16 ft (detached) |
| Side Setback | 5 ft |
| Rear Setback | 5 ft |
| Architect / Engineer Stamp | Not required under the size cap* |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | Yes - in historic districts only |
| HOA Prevalence | 21% of properties |
| Permit Fees | $350–$600 |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-08-15T06:10:50.038Z. Always confirm with the Development Services before designing.
Sherman Permit Process
Sherman ADU Permit Timeline & Fees
Local Financing Resources
Local ADU Lenders in Sherman
These lenders offer HELOC, construction, and renovation loans for ADU projects in Grayson County. Compare terms before committing.
Specialty ADU lender partnering with Texas credit unions (e.g., First Community CU); RenoFi Loan is underwritten on the home's after-renovation value, allowing borrowers to access up to ~90% of post-completion value with up to 20-year terms — ideal for ADU projects.
Visit Lender ↗Sherman branch HELOC with intro APR of 6.99% (12 months) with checking + autopay, credit limits $10K–$1,000,000, max 80% LTV, 700+ credit score required for intro rate — equity can be drawn as needed to fund an ADU build.
Visit Lender ↗Oldest state bank in Texas with a full-service Sherman branch (2315 N. Hwy 75, 903-771-4555); offers residential construction and home improvement loans across North & Central Texas, suitable for ADU ground-up builds.
Visit Lender ↗One-Time Close construction loan up to $766,550 in Texas, 9-month build phase with interest-only payments, converts to permanent financing — usable for ADU ground-up construction.
Visit Lender ↗North Texas community bank serving Sherman and surrounding Grayson County communities; offers mortgage loans including home purchase, lot, refinancing, and construction options suitable for ADU projects.
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 Sherman
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 Sherman 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 Development 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 Development Services. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Sherman ADU Package
Engineered for TX Permit Approvals
What You Get
Sherman ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Sherman:
| 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 Sherman 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 $903/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 Sherman'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 Development 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 Sherman.
Build costs reflect local construction data for Sherman. 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 Sherman construction data (city-verified data) and Development Services. Outcomes vary by project scope and site conditions.
Building Code
Sherman Climate Zone & Energy Code
Texas does not adopt California Title 24. Texas uses the 2015 International Energy Conservation Code (IECC) with Texas-specific amendments (effective 09/01/2016 for residential, 11/01/2016 for commercial) administered by the State Energy Conservation Office; per Ordinance No. 6691 (effective Feb 5, 2024), the City of Sherman has adopted the 2021 I-Codes (referencing the 2015 IECC for energy) plus the 2023 NEC.
Compare Cities
Sherman vs. Nearby Texas Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Eligibility |
|---|---|---|---|---|---|
| Sherman ← you | — | $350+ | $903/mo | 6% | Free check → |
| Houston | $250 | $2,000+ | $1,143/mo | 6.5% | View → |
| San Antonio | $275 | $2,000+ | $1,024/mo | 6% | View → |
| Dallas | $250 | $1,707+ | $1,384/mo | 5.5% | View → |
| Fort Worth | $200 | $2,000+ | $1,254/mo | 6.8% | View → |
Frequently Asked
Sherman ADU Questions
How much does it cost to build an ADU in Sherman? +
What is the maximum ADU size allowed in Sherman? +
How long does the ADU permit process take in Sherman? +
Do I need owner-occupancy to build an ADU in Sherman? +
What's the rental income potential for an ADU in Sherman? +
How much does it cost to get ADU drawings in Sherman? +
What drawings are required for an ADU permit in Sherman? +
Can I convert my garage to an ADU in Sherman? +
What neighborhoods in Sherman are best for ADU investment? +
Is Sherman ADU-friendly? +
How much will an ADU increase my property value in Sherman? +
Can I use my Sherman ADU as a short-term rental (Airbnb / VRBO)? +
Does Sherman's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Sherman? +
More Services in Sherman
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