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Planning & Building

County of San Luis Obispo

Coastal Accessory Dwelling Unit

There are five (5) different types of Accessory Dwelling Unit options depending on the home or multi-family dwelling.

 

Review ADU Types

  • Click on an ADU development type in the table below for development specific standards.

 

Refer to Frequently Asked Questions Below

  • Click on the Frequently Asked Questions at the bottom of this page.

 

Read Full Text of  Coastal ADU Ordinance and State ADU Law

 

ADU DEVELOPMENT TYPES

 

Sites with an existing or proposed

SINGLE-FAMILY DWELLING (SFD)

Sites with an existing or proposed

MULTI-FAMILY DWELLING (MFD)

One (1)

Additional Accessory Dwelling Unit

Proposing one ADU or JADU within:

  • A proposed SFD;
  • An existing SFD; or
  • An existing accessory structure, such as a garage

Max. ADU size: 1,000 sq. ft.

Max. JADU size: 500 sq. ft.

 

See “TYPE A

for development type specific standards

See “TYPE C” or “TYPE D

for development type specific standards

Proposing one attached or detached ADU:

Max. size: 1,200 sq. ft.

 

See “TYPE E
for development type specific standards

Up to Two (2)

Additional Accessory Dwelling Units

Proposing one attached JADU and 1 detached ADU:

Max. ADU size: 800 sq. ft.

Max. JADU size: 500 sq. ft.

 

See “TYPE B

for development type specific standards

Proposing two or less detached ADUs:

Max. size: 1,000 sq. ft.

 

 

See “TYPE D

for development type specific standards

More Than

Two (2)

Additional Accessory Dwelling Units

----------

Proposing multiple ADUs within existing MFD:

Min. number of ADUs: One

Max. number of ADUs: 25% of existing dwellings

Max. ADU size: 1,000 sq. ft.

 

See “TYPE C

for development type specific standards

Frequently Asked Questions