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Find Detached ADU Builders and Contractors

A detached ADU is a standalone accessory dwelling unit built separately from the main house. These backyard homes offer maximum privacy and can range from 400 to 1,200 sqft, with costs from $200,000 to $400,000.

62,610 contractors found

About Detached ADU

Detached ADUs are the highest-value type of accessory dwelling unit, offering complete separation from the primary residence. Also known as backyard cottages, granny flats, or guest houses, detached ADUs add the most resale value and generate the highest rental income. In Florida, homeowners often search for these as "guest houses," "casitas," or "in-law suites."

Typical Cost Range

$200,000 – $400,000+

Timeline

8–14 months

Detached ADU Pros and Cons

Pros

  • +Maximum privacy — fully separate from main home
  • +Highest rental income potential
  • +Adds the most resale value to your property
  • +Flexible design — studio, 1BR, or 2BR layouts

Cons

  • Highest cost ADU type ($200K–$400K+)
  • Longest construction timeline (8–14 months)
  • Requires sufficient lot space and setback clearance
  • Utility connections (sewer, water, electric) add cost

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Frequently Asked Questions

How much does a detached ADU cost to build?
Detached ADUs typically cost $200,000 to $400,000+, or $350–$600 per square foot. Costs vary by size, finishes, and location. California’s coastal cities tend to be at the higher end.
What are the setback requirements for a detached ADU?
California requires a minimum 4-foot setback from side and rear property lines for new detached ADUs. Florida setback requirements vary by municipality under SB 48.
How much rental income can a detached ADU generate?
Detached ADUs in California generate $1,500–$3,500/month depending on size and location. Florida rental income varies but is growing as ADU awareness increases.
How close to my property line can I build a detached ADU?
In California, detached ADUs can be built as close as 4 feet from side and rear property lines. Converted existing structures may maintain their current setbacks even if closer than 4 feet.

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