How Much Does a New Garage Cost in California?
Garage construction costs in California in 2026 run $80-200 per square foot for stick-built construction. A standard 2-car detached garage runs $60K-160K depending on city, finish level, and whether the lot needs grading. Many homeowners considering a garage are also considering an ADU — costs are surprisingly close, and the rental income from an ADU often justifies the marginal $40-80K extra.
Garage Types and Per-Sqft Cost
Pricing varies by attachment and complexity:
- Detached, simple stick-built: $100-150/sqft. New foundation, framing, roof, single door. Fastest permit
- Attached, sharing a wall: $80-130/sqft. Saves on one wall but firewall requirements add cost
- Prefab steel: $40-80/sqft. Faster install but rarely permitted as primary garage in CA cities
- Garage with second-story room/ADU above: $200-400/sqft. Counts as an ADU, hits ADU permit fees plus second-story load engineering
What Drives Garage Cost
Beyond the obvious:
- Lot grading: a sloped lot can add $10-30K for cut/fill before foundation
- Driveway extension or replacement: $8-25K for typical SD residential lots
- Permits and city fees: $4-15K depending on city (San Diego is on the higher end)
- Electrical sub-panel for EV charger and shop outlets: $3-7K
- Insulation, drywall, finished interior (if you'll use as workshop): $8-20K extra
- Garage door (high quality, insulated): $1.5-4K each (don't cheap out — biggest visible feature)
Garage vs ADU — Which Pays Off?
If you have the lot space and the building envelope to support either, do the math:
- Detached garage: $80-160K, $0/mo income, modest resale lift
- Garage with ADU above: $200-400K, $1,800-3,200/mo rent potential, 20-30% property value lift
- Standalone ADU (no garage): $180-320K, similar rent, no parking added
- Decision: if you need parking AND want rental income, garage-with-ADU dominates economically. If you only need parking, simple detached garage wins on cost
Our garage cost calculator estimates by size, type, and city, factors site work and permits separately, and shows the marginal cost of adding an ADU above. Run a garage construction estimate before talking to contractors.
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