Santa Clara Zoning and ADU Rules: A Home Seller’s Guide

Last updated: November 2026. Reviewed by the Cash Home Buyers CA team.

The City of Santa Clara publishes clear ADU limits for size, height and setbacks. If your house has a backyard unit or a garage conversion, these numbers decide whether it is legal when you sell.

Santa Clara ADU rules at a glance

Item	What the City says
Minimum size	150 sq ft
Detached ADU maximum	1,000 sq ft on a parcel of 5,500 sq ft or less; 1,200 sq ft on a larger parcel
Attached ADU maximum	1,000 sq ft or 50% of the main unit; 800 sq ft is allowed by State law
JADU maximum	500 sq ft
Height	Detached: 18 ft single story, 25 ft for 1.5 stories. Attached: 25 ft, 2 stories
Setbacks	4 ft side, rear and corner side (15 ft for multi-story rear elements); 6 ft from the main residence; none for conversions
Parking	Not required
Contacts	Planning 408-615-2450, planning@santaclaraca.gov; Public Works 408-615-3000

Other requirements

• Owner occupancy applies to JADUs, with a deed restriction.
• Historically listed properties need a Significant Property Alteration permit.
• ADUs can be submitted as a building permit.
• The governing section is City Code 18.60.020.

Selling a home with an ADU

California sellers must disclose known unpermitted construction. Buyers and lenders usually want a final permit for any ADU. You can legalize it, credit the buyer, or sell as-is for cash.

Seller checklist

• Confirm a final permit for the ADU or JADU.
• Check size and height against the limits above.
• For a JADU, confirm the deed restriction is recorded.
• If the home is historically listed, confirm alterations were approved.
• Keep plans, invoices and inspection records.

Closing costs

Santa Clara County’s documentary transfer tax is $0.55 per $500 of sale price, or $660 on a $600,000 sale.

How to sell a house in Santa Clara

1. Review your ADU and permit records.
2. Decide whether to legalize, credit, or sell as-is.
3. Request a cash offer from us.
4. Pick a closing date, often within days.
5. Close through escrow and get paid.

Frequently asked questions

How big can a detached ADU be in Santa Clara?

Up to 1,000 sq ft on a parcel of 5,500 sq ft or less, and up to 1,200 sq ft on a larger parcel.

Is parking required for an ADU?

No.

What setbacks apply?

4 ft side, rear and corner side, and 6 ft from the main residence. Conversions need no setbacks.

Can I sell with an unpermitted ADU?

Yes, with disclosure. A cash buyer can purchase as-is.

More guides

• Santa Clara permits guide
• Santa Clara code enforcement guide
• Santa Clara County property tax guide

Sources

• City of Santa Clara, Planning Division ADU handout

This guide is general information, not legal advice. Confirm current rules with the City of Santa Clara.