Plan record

Plan 1 - Efficiency Studio

Plan 1 - Efficiency Studio is a pre-approved detached ADU plan from RRM Design Group. The public source lists it as 205 sq ft, studio, and 1 bath. It originated in the Concord, Contra Costa County, California, USA program. This directory currently shows acceptance in Concord, Contra Costa County, California, USA. Source context comes from City of Concord, last checked Jul 28, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Pre-approved RRM Design Group Official city source
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Source-backed summary

What public sources list

Plan 1 - Efficiency Studio is a pre-approved detached ADU plan from RRM Design Group. The public source lists it as 205 sq ft, studio, and 1 bath. It originated in the Concord, Contra Costa County, California, USA program. This directory currently shows acceptance in Concord, Contra Costa County, California, USA. Source context comes from City of Concord, last checked Jul 28, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Provider record
RRM Design Group

Details

Plan facts

Plan identifier
Plan 1
Provider
RRM Design Group
Accepted locations
Status
Pre-approved
Size
205 sq ft
Bedrooms
Studio
Bathrooms
1 bath
ADU type
Detached
Construction type
Stick built
Plan fee
$0
Estimated cost
Not listed in source
Last checked
Jul 28, 2026

Plan notes

Notes

Foundation notes
Standard plan foundation still requires site confirmation; sloped sites or expansive soil may require geotechnical support and an alternate foundation permit.
Utility notes
Electrical load calculation is required; utility coordination and a service-panel upgrade may be needed.
Energy notes
Electric heat-pump HVAC and water heating are required. The City construction guide exempts this plan from its solar requirement.
Accessibility notes
Not listed in source
Permit fee notes
The plan is free, but hourly site-plan review and other permit, impact, utility, construction, and professional costs may apply.
Cost notes
City application instructions specify a $52,271 job valuation for permit entry; this is not an estimated project cost.
Additional notes
City-owned standardized plan licensed only for use within Concord. It may be mirrored or reoriented; design changes require a separate permit. No separately listed floor-plan option.

Source and evidence

FREE Pre-Approved ADU Plans

Official city source
Publisher
City of Concord
Source type
Plan catalog
Reliability
Official city/county/state government source (5/5)
Last checked
Jul 28, 2026
Accessed
Jul 28, 2026
Official source Plan document

Accepted-in locations

Accepted Locations

1 accepted location