Plan record

The Barnhouse ADU

The Barnhouse ADU is a pre-approved detached ADU plan from Mayberry Workshop. The public source lists it as 900 sq ft, 2 beds, and 2 baths. It originated in the San Jose, Santa Clara County, California, USA program. This directory currently shows acceptance in Cotati, Sonoma County, California, USA and San Jose, Santa Clara County, California, USA. Source context comes from Mayberry Workshop Architecture, last checked May 4, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Pre-approved Mayberry Workshop Provider source
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Source-backed summary

What public sources list

The Barnhouse ADU is a pre-approved detached ADU plan from Mayberry Workshop. The public source lists it as 900 sq ft, 2 beds, and 2 baths. It originated in the San Jose, Santa Clara County, California, USA program. This directory currently shows acceptance in Cotati, Sonoma County, California, USA and San Jose, Santa Clara County, California, USA. Source context comes from Mayberry Workshop Architecture, last checked May 4, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Provider record
Mayberry Workshop

Details

Plan facts

Plan identifier
Not listed in source
Status
Pre-approved
Size
900 sq ft
Bedrooms
2 beds
Bathrooms
2 baths
ADU type
Detached
Construction type
Stick built
Plan fee
$800
Estimated cost
Not listed in source
Last checked
May 4, 2026

Plan notes

Notes

Foundation notes
Not listed in source
Utility notes
Not listed in source
Energy notes
16-18 ft ceilings; ~24x42 ft footprint.
Accessibility notes
Not listed in source
Permit fee notes
Mayberry licensing fee $800 + $5,500 full permit drawings; permit administration fee waived for San Jose preapproved.
Cost notes
Not listed in source
Additional notes
Verified on Mayberry Workshop website (preapproved in San Jose AND Napa/Sonoma County).

Source and evidence

ADU - Accessory Dwelling Units - Mayberry Workshop

Provider source
Publisher
Mayberry Workshop Architecture
Source type
Vendor page
Reliability
Provider linked by official source (3/5)
Last checked
May 4, 2026
Accessed
May 4, 2026
Official source

Accepted-in locations

Accepted Locations

2 accepted locations