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ADU Cost Calculator Los Angeles, California

Whether you’re planning a new development or repurposing an existing property, we deliver the data, analysis, and insight you need to make smart decisions.

Planning to build an Accessory Dwelling Unit (ADU) in Los Angeles County? Use our ADU Cost Calculator Los Angeles to quickly determine whether your property qualifies for an ADU and to estimate construction, permit, and impact fees.

How It Works

  • Enter property size, project type, and estimated construction cost.
  • Choose whether you are building a new ADU or converting an existing structure.
  • Get instant estimates of total fees, including building permits, plan check, inspections, and impact fees.

ADU Feasibility & Cost Calculator – Los Angeles County

This calculator helps determine whether your property qualifies for an Accessory Dwelling Unit (ADU) and estimates associated costs, including construction value, permit and impact fees. Use as an initial budgeting guide — JDJ Consulting can provide exact figures.

Total Estimated ADU‑Related Fees: $0

*These figures are estimates only. Actual fees depend on zoning, lot size, utility connections, fire code, state law exemptions (e.g., ADU under 750 sq ft may be exempt from certain impact fees)

Key Terms

  • Permit Fees: Costs charged by the city or county to issue and inspect your ADU permit.
  • Plan Check Fee: City review of your ADU plans for compliance with building codes.
  • Impact Fees: Fees for schools, parks, and infrastructure that may apply to new units.

  • Feasibility: Determines whether zoning and property size allow for an ADU.

Typical SB 9 Cost Breakdown 💰

Expense Estimated Range
Design & Permitting $20k – $50k
Construction $150k – $400k / unit
Utilities $10k – $30k
Contingency 10% of total

Data source: California SB 9 guidelines & regional development averages

Expert Help

After estimating, JDJ Consulting can review your project, confirm fee accuracy, and expedite approvals. Book a Consultation or call (818) 793-5058 to speak with an expert.

Expert entitlements and permit expediting services across Miami, Austin and LA. Helping developers understanding zoning laws and city processes since 2018.

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