What is the cheapest ADU to build in Sacramento?

A garage conversion (JADU or ADU) is typically the most affordable option, starting around $80,000 for a basic conversion. The existing structure reduces foundation and framing costs significantly.

How much does a 1,000 sq ft ADU cost in Sacramento?

A 1,000 sq ft detached ADU in Sacramento typically costs $280,000–$420,000 including all soft costs and permits. Budget $300,000 as a reasonable midpoint estimate.

Back to all articles

Costs & Financing10 min readJanuary 22, 2026

Sacramento ADU Cost Breakdown 2026: What You'll Actually Pay

ADU costs in Sacramento range from $80,000 for a basic garage conversion to $450,000+ for a custom detached unit. Here's a detailed breakdown of what drives the price.

ADU Cost by Type in Sacramento (2026)

Costs vary significantly by ADU type. Here are current market ranges based on Sacramento builder quotes and completed projects.

Garage Conversion (JADU/ADU): $80,000–$150,000
Attached ADU (addition to home): $150,000–$300,000
Detached ADU (new construction): $200,000–$450,000
Prefab/Modular ADU: $100,000–$280,000 (including site prep and installation)

Hard Costs: Construction

Hard costs are the direct construction expenses — labor and materials. In Sacramento, construction costs run $250–$450 per square foot for ADUs, depending on finishes and complexity.

Soft Costs: Design, Permits, and Fees

Soft costs are often underestimated. Budget 15–25% of your total project cost for these items.

Architectural design: $8,000–$25,000
Structural engineering: $3,000–$8,000
Permit fees: $5,000–$15,000
Utility connection fees: $5,000–$20,000
Soil report (if required): $2,000–$5,000
Title 24 energy report: $1,500–$3,000

Site Preparation Costs

Site conditions significantly affect total cost. Sloped lots, poor soil, or existing structures that need removal can add $10,000–$50,000 to your project.

Financing Costs

If you're financing your ADU, factor in loan origination fees (1–3% of loan amount), interest costs during construction, and any prepayment penalties on existing loans.

Return on Investment

At current Sacramento rental rates ($1,400–$2,500/month), a $200,000 ADU investment generates $16,800–$30,000 in annual gross rental income — a 8–15% gross yield before expenses.

Related Resources

Pair your cost research with these guides on financing, investment returns, and builder selection.

ADU Financing Options Compared — 7 loan options to fund your ADU project
Best Sacramento Neighborhoods for ADU Investment — Where your construction dollars generate the highest rental returns
ADU Cost Calculator — Get a personalized estimate based on your ADU type and size
8 Costly ADU Mistakes to Avoid — Common cost overruns and how to prevent them