County context

Contra Costa County Pre-Approved ADU Plans

Browse official city and county pre-approved ADU plan programs in Contra Costa County, California.

Source-backed county plan listings

Program Overview

This Contra Costa County page summarizes source-backed county context for Contra Costa County, California. The current public dataset lists 5 city program pages in this county and 1 county-level accepted-plan record. County-level plan sources include ADORE Homes and Contra Costa County. Provider names include Adore Homes.

County records may apply only in unincorporated areas or county-administered jurisdictions, so verify the official source before relying on a plan for an incorporated city. County fee and permit data includes 3 fee records and 14 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.

Summary

Location
Contra Costa County, California, USA
County-level accepted plans
1 accepted plan
Providers
1 provider
Origin programs
1 program
Plan size range
800 sq ft
Permit sources
18 sources

Included Locations

County-Level Accepted Plans

1 plan

Permit Requirements

14 requirements

ADORE Horizon 800 X

ADORE Horizon separation condition

Government PDF

Place the manufactured ADU at least five feet from the property line and ten feet from adjacent dwellings to avoid a rated-wall trigger.

Last checked
Jul 28, 2026
Notes
The plan explains that a triggered rated wall would require DAPIA inspection and approval.

Fees

3 fee records

Site specific

Site-specific planning review

Official county source

Minimum deposit with time-and-materials billing; customized estimate required

Last checked
Jul 28, 2026
Notes
Not listed in source

Official Sources

18 sources