Plan record

Grandpa's ADU

Grandpa's ADU is a prototype detached ADU plan with no provider listed in the current public source. The public source lists it as 682 sq ft and 1 bed; bathroom count is not listed. It originated in the Coconino County, Arizona, USA program. This directory currently shows acceptance in Coconino County, Arizona, USA. Source context comes from Coconino County, last checked Aug 26, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Prototype Official county source
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Source-backed summary

What public sources list

Grandpa's ADU is a prototype detached ADU plan with no provider listed in the current public source. The public source lists it as 682 sq ft and 1 bed; bathroom count is not listed. It originated in the Coconino County, Arizona, USA program. This directory currently shows acceptance in Coconino County, Arizona, USA. Source context comes from Coconino County, last checked Aug 26, 2026. Use the linked provider, location, and source records to verify current acceptance before relying on the plan.

Provider record
Not listed in source
Accepted location pages

Details

Plan facts

Plan identifier
Not listed in source
Provider
Not listed in source
Accepted locations
Status
Prototype
Size
682 sq ft
Bedrooms
1 bed
Bathrooms
Not listed in source
ADU type
Detached
Construction type
Unknown
Plan fee
Not listed in source
Estimated cost
Not listed in source
Last checked
Aug 26, 2026

Plan notes

Notes

Foundation notes
Not listed in source
Utility notes
Not listed in source
Energy notes
Not listed in source
Accessibility notes
Not listed in source
Permit fee notes
County plan-library fees are separate from site-specific review, permit, modification, and professional costs.
Cost notes
Not listed in source
Additional notes
Plan name and listed size/bedroom summary come from the official Flagstaff catalog; Coconino County adopts the same library but has not pre-reviewed it.

Source and evidence

Model ADU Plans Library

Official county source
Publisher
Coconino County
Source type
Plan catalog
Reliability
Official city/county/state government source (5/5)
Last checked
Aug 26, 2026
Accessed
Aug 26, 2026
Official source Plan page

Accepted-in locations

Accepted Locations

1 accepted location