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
- 11 sources
County context
Contra Costa County Pre-Approved ADU Plans
Browse official city and county pre-approved ADU plan programs in Contra Costa County, California.
Program Overview
This Contra Costa County page summarizes source-backed county context for Contra Costa County, California. The current export lists 2 city program pages in this county and 1 county-level accepted-plan record. County-level plan sources include 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 9 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.
Included Locations
City
Concord, Contra Costa County, California, USA
6 accepted plans
City
Pleasant Hill, Contra Costa County, California, USA
9 accepted plans
County-Level Accepted Plans
1 plan Source-backed record Official county source
- Provider
- Adore Homes
- Origin program
- Contra Costa County, California, USA
- Accepted location
- Contra Costa County, California, USA
- Size
- 800 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 2 baths
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Permit Requirements
9 requirementsSite specific
Site-specific planning and building permits
A PADU still requires site-specific review and separate planning and building permits.
- Last checked
- Jul 28, 2026
- Notes
- Preapproval of the design is not approval for a particular property.
Site specific
Plan creator authorization
The applicant and plan creator must authorize use and submit the underlying authorization agreement.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Site specific
Site plan and foundation package
A site plan, foundation plan, details, and calculations are required.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Site specific
Geotechnical investigation
May be required where site slope exceeds 5 percent or one foot across the ADU.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Site specific
Health, safety, and fire compliance
Applicable health, safety, and fire requirements remain subject to site review.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
All
PADU revision and code-cycle limits
Revisions require separate approval, and preapproval is effective only in the current triennial code cycle.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
ADORE Horizon 800 X
ADORE Horizon separation condition
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.
Site specific
Final sanitary and fire approvals
Verify applicable Sanitary District and Fire Protection District approvals before final inspection.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
County plan users
County permit package
Site plan, foundation, geotechnical, fire, planning, and building review can remain.
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Fees
3 fee recordsCounty program vendor submission
Vendor PADU preapproval processing
Initial retainer plus staff time billed at approved hourly rates; total varies by complexity
- Last checked
- Jul 28, 2026
- Notes
- This is the vendor design-preapproval process, not the property owner's site permit.
Site specific
Site-specific planning review
Minimum deposit with time-and-materials billing; customized estimate required
- Source
- Payment Information
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Site specific
Site-specific building permit
Valuation-based; customized estimate required
- Source
- Payment Information
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Official Sources
11 sourcesAccessory Dwelling Units
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Payment Information
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Pre-Approved Accessory Dwelling Unit Plans
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Accessory Dwelling Units
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Pre-Approved Accessory Dwelling Unit Plans
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Building Permit Accessory Dwelling Unit Submittal Checklist for a Site
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Preapproved ADU Plan Application Checklist
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Preapproved ADU Plan Application Checklist for Vendors
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Applicant Authorization and Agreement to Pay Application Fees
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
Authorization for Use of Preapproved or Previously Approved ADU Plans
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026
CDSU25-00141 Pre-Approval Plans Final
- Publisher
- Contra Costa County
- Last checked
- Jul 28, 2026