Accessory Dwelling Units (ADUs) offer flexibility—guest suites, home offices, rental income, or independent living for family. In Dallas–Fort Worth, ADU planning involves understanding zoning basics, site placement, privacy considerations, and the design details that make a small structure feel like a real home.
Here's a practical guide to planning ADUs in DFW.
What is an ADU?
An ADU is a secondary living structure on a residential lot:
- detached backyard units (casitas, guest houses)
- garage conversions
- above-garage apartments
- pool house conversions
ADUs typically include a bedroom, bathroom, and kitchenette or full kitchen—enough to function as independent living space.
Zoning Basics in DFW (Know Before You Plan)
Zoning rules for ADUs vary significantly across Dallas–Fort Worth:
- lot size minimums: many cities require a minimum lot size
- setback requirements: distance from property lines, main house, and other structures
- size limits: maximum square footage or percentage of main house size
- height restrictions: many neighborhoods cap ADU height
- parking requirements: some cities require additional parking spaces
- HOA rules: separate from city zoning, HOAs may restrict or prohibit ADUs
Always confirm local and HOA requirements before designing an ADU.
Site Placement Strategy
ADU location affects privacy, access, and livability:
- privacy for both units: position the ADU to minimize sightlines into main house windows
- access and circulation: plan a clear path from street or driveway
- utility connections: proximity to existing water, sewer, gas, and electric reduces costs
- outdoor space: leave usable yard space for both the main house and ADU
- sun orientation: consider natural light and shade for comfort
Utility Connections and Infrastructure
ADUs need real infrastructure:
- electrical service: may require panel upgrades or separate metering
- plumbing: connection to existing sewer or septic
- HVAC: independent heating and cooling systems
- gas (if applicable): for cooking, heating, or water heaters
Running utilities to a detached ADU is one of the largest cost factors—plan routes early.
Design Details That Matter
Small spaces need smart planning:
- open layouts: maximize perceived space
- high ceilings: vaulted or raised ceilings add volume
- natural light: windows and skylights make small spaces feel larger
- storage solutions: built-ins and efficient cabinetry
- material continuity: consistent finishes create cohesion
Well-designed ADUs feel complete—not like "just a shed with a bathroom."
Permitting and Approval Process
ADUs typically require:
- site plans showing placement and setbacks
- architectural drawings
- utility plans
- engineering (if needed for foundation or structure)
- HOA approval (if applicable)
The permitting process varies by city. Some municipalities encourage ADUs, while others have restrictive rules.
Common ADU Uses in DFW
- guest suites: private space for visitors or family
- home offices: separate work environment
- rental income: long-term or short-term rentals (where allowed)
- aging-in-place: independent living for parents or family members
- teen or adult children: semi-independent living on the same property
DFW Tips
- Zoning and HOA rules vary widely—confirm before planning
- Site placement affects privacy, access, and utility costs
- Design for natural light and efficient layouts
- Utility infrastructure is a major cost factor
- Permitting process varies by city
FAQ
Some areas allow ADUs, but rules vary by zoning district, lot size, and HOA guidelines. Always verify with your city's planning department and HOA before moving forward.
ADUs commonly range from 400 to 1,200 square feet, depending on zoning limits and site constraints. Many cities cap ADU size as a percentage of the main house square footage.
It depends on the city and intended use. Some jurisdictions require separate metering for rentals, while owner-occupied ADUs may share utilities with the main house.
Costs vary widely based on size, finishes, site conditions, and utility access. Budget for design, permitting, site prep, utilities, structure, and finishes. Professional ADU builders can provide estimates based on your specific site.
In some cities, yes—but short-term rentals may have additional restrictions. Long-term rentals are more commonly allowed. Always verify local rules and HOA covenants.
ADUs typically require building permits, site plans, architectural drawings, and utility permits. If the ADU affects setbacks, height, or lot coverage, additional zoning approvals may be needed.