Full ADU Conversion Cost across San Diego County
A complete garage ADU can include design, permits, utility work, and construction. In an October 16, 2026 guide, GreatBuildz estimates $150,000 to $230,000 for a San Diego garage-conversion ADU including plans, permits, city fees, and construction. This is one company’s published estimate, not a quote or a measured market average. The guide does not specify a project sample; property conditions and scope can change the total.
What moves the price
- Kitchen and bathroom layout
- Distance and condition of utility connections
- Existing garage structure and slab
- Finish selections and agency fees
What to ask about in a quote
- Drawings and application responsibilities
- Utility work and fixtures
- Interior and exterior finishes
- Inspections and any excluded fees
Source for the published estimate
Common questions
How can I compare ADU proposals?
Give each professional the same intended layout and ask for an itemized scope, allowances, and exclusions.
What belongs in a full ADU estimate?
Ask whether drawings, permit fees, utility connections, kitchen and bathroom fixtures, and finish work are included. Separate the construction quote from fees paid to the agency or utility.
How should I compare fixture allowances?
Compare the allowance for each fixture and cabinet package, installation, and what happens if your selections cost more. Ask whether sales tax and delivery are included.
Discuss your project
Share your plans and request a connection with a local professional.