When you’re deciding between a Built-In ADU (like a basement suite, garage conversion, or attached addition) and a Detached ADU (like a backyard cottage or casita), the choice comes down to cost, privacy, flexibility, and long-term value. R5 Homes builds both options seamlessly into their designs—but which one is right for you? Let’s break it down.
What Are the Advantages of a Built-In ADU?
- Lower Cost to Build – Uses your home’s existing foundation, walls, and utilities. Often $50k–$120k vs. $150k–$300k for detached.
- Faster Completion – Conversions can be finished in 6–12 weeks vs. months for a new detached build.
- Utility Efficiency – Shares water, sewer, and HVAC systems with the main home.
- Easier Permitting – Many cities already allow internal ADUs by right.
- Great for Family Use – Perfect for parents, in-laws, or adult children since it’s connected to the home.
What Are the Tradeoffs of a Built-In ADU?
- Less privacy due to shared walls and ceilings.
- Lower rental income potential since tenants may pay less.
- Layout limitations based on basement ceiling height or garage size.
- May be seen as “modified space” instead of a true second home when reselling.
What Are the Advantages of a Detached ADU?
- Maximum Privacy – A standalone unit with its own entrance and yard space.
- Higher Rental Income – Tenants pay more for full independence (great for long-term or Airbnb).
- Design Flexibility – Build exactly what you want, from 400–1,200 sq. ft. with 1–2 bedrooms.
- Adds Strong Resale Value – Viewed as a genuine second home on the property.
- Future Downsizing Option – Live in the ADU later and rent out the main home.
What Are the Tradeoffs of a Detached ADU?
- Higher construction cost with its own foundation and utilities.
- Longer permitting and build timeline—3–6 months or more.
- Stricter rules in many cities (setbacks, lot coverage, parking).
- Requires enough yard space, reducing backyard usability.
So Which ADU is Right for You?
👉 Built-In ADU = affordable, fast, and family-friendly—but less private and less valuable as a rental.
👉 Detached ADU = more expensive and time-intensive—but offers independence, higher rental income, and stronger resale value.
- Buyers who want affordability and multigenerational flexibility → choose a Built-In ADU.
- Buyers who want privacy, stronger rents, and long-term value → go with a Detached ADU.
With R5 Homes, you don’t have to choose between practicality and investment—they can design your ADU as either built-in or detached, seamlessly integrated with your home.
⚖️ Bottom line:
- Built-In ADU = cost-efficient and family-focused.
- Detached ADU = independent, higher-value investment.
- R5 Homes = the builder who delivers both, seamlessly.
