Texas ADU ROI Calculator
Calculate the return on investment for an accessory dwelling unit in Texas
Texas Calculator
Get accurate results
Updated for 2025 with real Texas rates, brackets, and regulations
ADU (Accessory Dwelling Unit) investment in Texas varies dramatically by city — Houston has NO zoning restrictions (easiest in the state), Austin passed major ADU reforms in 2023, while Dallas and San Antonio have varying restrictions. Unlike California's statewide ADU mandate, Texas has no state-level ADU law, so rules depend entirely on local ordinances. This calculator factors in Texas-specific costs including the property tax increase your ADU will trigger (at the full 1.80% rate), permit fees by city, and realistic rent projections for each market.
Calculate Your TX Tax
10-Year Total ROI
117.7%
Monthly Rental Income
$1,400
Annual Net Income
$12,084
Cap Rate
7.53%
Payback Period
13.3years
Total Build Cost
$160,500
Annual Property Tax Increase
$2,700
Est. Value Added
$68,000
Breakdown
Insight
A detached ADU costing $160,500 generates $12,084/year net income (7.5% cap rate). Payback: 13.3 years. Texas ADU rules vary dramatically by city: Houston has NO zoning (easiest in state), Austin passed major ADU reforms in 2023 allowing ADUs on most residential lots. CAUTION: Texas's high property taxes (1.80%) mean your ADU will increase your property tax by ~$2,700/year — factor this into your ROI. Unlike California, Texas has no statewide ADU mandate, so check your city's specific ordinances. Dallas, San Antonio, and Fort Worth have varying ADU restrictions.
AI Explanation
What This Means
Based on default inputs, the Texas ADU ROI Calculator shows a 10-year total roi of 117.7 %. Key figures: Monthly Rental Income: $1,400, Annual Net Income: $12,084, Cap Rate: 7.53%, Payback Period: 13.3years, Total Build Cost: $160,500, Annual Property Tax Increase: $2,700, Est. Value Added: $68,000.
Key Insights
A detached ADU costing $160,500 generates $12,084/year net income (7.5% cap rate). Payback: 13.3 years. Texas ADU rules vary dramatically by city: Houston has NO zoning (easiest in state), Austin passed major ADU reforms in 2023 allowing ADUs on most residential lots. CAUTION: Texas's high property taxes (1.80%) mean your ADU will increase your property tax by ~$2,700/year — factor this into your ROI. Unlike California, Texas has no statewide ADU mandate, so check your city's specific ordinances. Dallas, San Antonio, and Fort Worth have varying ADU restrictions.
What You Can Do
Enter your actual figures in the calculator above for a personalized breakdown. Consider consulting a tax professional for comprehensive planning, especially for complex situations involving multiple income sources or deductions.
Keep In Mind
This calculator provides estimates based on 2026 rates. Actual tax liability may vary based on credits, exemptions, and other factors not captured here. This is for educational purposes only and should not be considered tax advice.
How the Texas ADU ROI Calculator Works
The Texas ADU ROI Calculator uses 2026 tax rates, brackets, and deductions specific to Texas to provide you with an accurate estimate of your tax obligations. Unlike generic federal-only calculators, this tool accounts for the unique tax structure that Texas residents face.
Formula
ROI = (10yr Net Income + Value Added) / Total Cost. Net Income = Rent - Expenses - Property Tax Increase. TX property tax on ADU value: ~1.80%.Simply enter your financial details above, and the calculator instantly computes your results using the latest available data. All calculations happen directly in your browser — your personal information is never sent to any server or stored anywhere.
Why Use a Texas-Specific Calculator?
State-Specific Rates
Uses real 2026 Texas tax brackets, rates, and thresholds — not generic national averages that miss state-level nuances.
Local Programs & Exemptions
Factors in Texas-specific programs, exemptions, and deductions that national calculators simply don't account for.
Instant & Private
All calculations run locally in your browser. No account required, no data stored, no waiting for results.
AI-Powered Explanations
Get a plain-English breakdown of your results with actionable insights you can actually use for financial planning.
What's Included
City-Specific Rules
Accounts for Houston (no zoning), Austin (reformed), and other TX city ADU regulations.
Property Tax Impact
Shows the significant property tax increase your ADU will trigger at Texas rates.
Realistic TX ROI
Lower construction costs + lower rents + high property taxes = accurate Texas ADU returns.
Frequently Asked Questions
Can I build an ADU anywhere in Texas?
It depends on the city. Houston has no zoning — you can build virtually anywhere. Austin passed pro-ADU reforms in 2023 allowing ADUs on most residential lots. Dallas, San Antonio, and Fort Worth have varying restrictions on lot size, setbacks, and parking. Check your specific city ordinance.
Will an ADU increase my property taxes?
Yes, significantly. Texas assesses ADUs at full market value with no exemption. At 1.80% property tax, a $150,000 ADU adds ~$2,700/year in property taxes. This must be factored into your ROI calculation — it's a major ongoing expense that reduces net rental income.
What does an ADU cost to build in Texas?
Detached ADUs: $120,000-$200,000. Attached additions: $80,000-$150,000. Garage conversions: $50,000-$100,000. Texas construction costs are lower than California (roughly 25-40% less), making ADUs more financially viable.
How much can I rent an ADU for in Texas?
Average ADU rents: Austin $1,200-1,600, Dallas $1,000-1,400, Houston $900-1,300, San Antonio $800-1,100. These are lower than coastal state ADU rents but your construction costs are also significantly lower.
Does Texas have an ADU waiver for impact fees?
No. Unlike California (which waives impact fees for ADUs under 750 sqft), Texas cities can and do charge impact fees for ADUs. These typically range from $1,500-$5,000 depending on the jurisdiction and whether new utility connections are required.
Important Information for Texas Residents
Tax laws in Texas can change annually. This calculator is updated regularly to reflect the latest 2026 rates and regulations, but you should always verify important financial decisions with a qualified Texas tax professional or CPA.
This tool is designed for informational and educational purposes. While we strive for accuracy using official Texas Department of Taxation data, the results should be used as estimates for planning purposes only. Your actual tax liability may differ based on credits, special circumstances, and legislative changes that occur after our last update.
For filing deadlines, payment schedules, and official forms, visit the Texas Department of Taxation and Finance website. If you have complex tax situations involving multiple states, business income, or significant investment gains, professional guidance is recommended.
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