How Much Does a ADU (Accessory Dwelling Unit) Cost in 2026?
Building a secondary dwelling unit on a residential property, either attached or detached, with full kitchen and bath.
pie_chartCost Breakdown
Percentages show typical range of total project cost. Actual breakdown varies by scope and specifications.
tuneFactors That Affect Cost
trending_upROI & Resale Value
Rental income potential $1,000-$3,000/month; 70-80% cost recovery on sale
mapRegional Cost Adjustments
National average costs should be adjusted based on your location. Coastal cities and high cost-of-living areas run significantly higher.
| Region | Adjustment |
|---|---|
| Northeast (NYC, Boston) | +20-35% |
| West Coast (SF, LA, Seattle) | +15-30% |
| Mountain West (Denver, SLC) | +5-15% |
| Midwest (Chicago, Detroit) | -5% to +10% |
| Southeast (Atlanta, Charlotte) | -5% to +5% |
| South Central (Dallas, Houston) | -10% to +5% |
| Rural areas | -10% to -20% |
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helpFrequently Asked Questions
How much does a adu (accessory dwelling unit) cost in 2026?
A adu (accessory dwelling unit) costs between $80,000 and $300,000 for most projects, with a mid-range average of $175,000. Luxury or custom projects can reach $500,000 or more.
How long does a adu (accessory dwelling unit) take?
A typical adu (accessory dwelling unit) takes 4-8 months to complete. Timeline varies based on project scope, permit requirements, weather, and contractor availability.
What is the ROI on a adu (accessory dwelling unit)?
Rental income potential $1,000-$3,000/month; 70-80% cost recovery on sale
Should I DIY or hire a contractor for a adu (accessory dwelling unit)?
It depends on the complexity and your skill level. Budget-tier costs assume some DIY work, while mid-range and above include full professional labor. For projects involving structural, electrical, or plumbing work, hiring licensed professionals is strongly recommended for safety and code compliance.