Maximize your property value and earn passive rental income. Compare licensed design-build contractors for custom detached ADUs, garage conversions, and modern prefab units.
Turnkey ADU costs range from $120,000 to $320,000+. Comparing architectural design-build firms, prefab modular builders, and general contractors gives you transparent cost-per-square-foot pricing and avoids hidden utility connection surprises.
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Specify detached ADU, garage conversion, or attached suite and estimated square footage.
Receive 3–4 itemized bids detailing architectural drawings, city permit fees, and finishes.
Hire an experienced builder with milestone escrow payments and clear completion guarantees.
States like California, Washington, Oregon, Texas, and Florida have passed historic zoning legislation eliminating parking requirements and streamlining permit approvals for backyard ADUs. Building a 600–800 sq. ft. 1-to-2 bedroom unit frequently delivers 12%–18% annual cash-on-cash rental yields while increasing overall property appraisal value by $150,000 to $300,000+.
Explore our specialized comparison guides for adu builders & backyard casitas:
Garage conversions leverage an existing foundation and roof to cut costs by 40%, whereas detached units allow larger 2-bedroom floorplans and total privacy for tenants.
Read Guide & Compare Quotes → Save $10,000+ SavingsPrefab ADUs offer factory-controlled quality and fixed pricing, but site preparation, crane delivery, and foundation costs vary. Comparing gives you the true all-in turnkey price.
Read Guide & Compare Quotes →Garage conversions average $75,000 to $130,000, while new detached ground-up ADUs average $160,000 to $290,000 depending on square footage, soil foundation, and utility trenching distance. Comparing bids helps you secure competitive per-square-foot pricing ($250 to $390/sq. ft.).
Yes! In most jurisdictions with updated ADU ordinances (including California, Washington, Texas, and parts of Florida), ADUs can be rented as long-term residential housing, generating immediate passive rental income.