Summary
- Location
- Stanislaus County, California, USA
- County-level accepted plans
- 8 accepted plans
- Providers
- 1 provider
- Origin programs
- 1 program
- Plan size range
- 260 to 1,192 sq ft
- Permit sources
- 3 sources
County context
Stanislaus County Pre-Approved ADU Plans
Browse official city and county pre-approved ADU plan programs in Stanislaus County, California.
Program Overview
This Stanislaus County page summarizes source-backed county context for Stanislaus County, California. The current export lists 1 city program page in this county and 8 county-level accepted-plan records. County-level plan sources include Stanislaus County Planning and Community Development. Provider names include Timothy P. Huff & Associates, Inc. (TPH Architects).
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 12 fee records and 8 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.
Included Locations
City
Modesto, Stanislaus County, California, USA
8 accepted plans
County-Level Accepted Plans
8 plans
Accepted
1050 square-foot two-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 1,050 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
1192 square-foot three-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 1,192 sq ft
- Bedrooms
- 3 beds
- Bathrooms
- 2 baths
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
260 square-foot one-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 260 sq ft
- Bedrooms
- Not listed in source
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
405 square-foot one-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 405 sq ft
- Bedrooms
- Not listed in source
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
562 square-foot one-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 562 sq ft
- Bedrooms
- 1 bed
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
744 square-foot one-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 744 sq ft
- Bedrooms
- 1 bed
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 798 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Accepted
896 square-foot two-bedroom ADU
Source-backed record Official county source
- Origin program
- Stanislaus County, California, USA
- Accepted location
- Stanislaus County, California, USA
- Size
- 896 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Permit Requirements
8 requirementsUnincorporated county
County geographic scope
County zoning and parcel-eligibility guidance applies to unincorporated Stanislaus County.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Partner-city use is governed by each city's own zoning and permitting.
Unincorporated county
Building permit
A building permit is required; only the property owner or a licensed contractor may be issued one.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- A tenant or lessee cannot receive the County permit.
Site specific
Scaled plot plan
Show the complete parcel, work, driveway, easements, north arrow, well, septic system, setbacks, and nearby structures.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Three sets are listed on the County page.
Site specific
Fire sprinkler plans
Required when the main dwelling is fire sprinklered; may be deferred.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Detached
Photovoltaic plans
Photovoltaic system plans are required for all new-construction detached ADUs.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- The County page labels this requirement as applicable.
Unincorporated county
Ownership records
Submit a recorded grant deed and complete assessor records.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Not listed in source
Site specific
Location-specific documents
Other documents may be required based on project type and location.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Flood, fire, septic, water, sewer, and other agency review may apply.
Unincorporated county
Pre-plan checked document relief
Floor, foundation, framing, construction-detail, elevation, engineering, electrical, plumbing, HVAC, and Title 24 sheets are listed as not required with pre-plan checked plans.
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- This does not waive the plot plan, permit, ownership records, applicable truss/PV/fire documents, or other site-specific submissions.
Fees
12 fee recordsDetached
County partner pre-plan checked plan cost
$0
- Source
- Accessory Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Free plan access does not waive permit, construction, utility, impact, or professional costs.
Unincorporated county
Estimated County building fees - 1,000 square feet or less
$2,625
- Last checked
- Jul 28, 2026
- Notes
- Undated estimate; includes up to $300 in plumbing, mechanical, and electrical fees. Verify before reliance.
Unincorporated county
Estimated County building fees - 1,100 square feet
$3,300
- Last checked
- Jul 28, 2026
- Notes
- Undated estimate; verify before reliance.
Unincorporated county
Estimated County building fees - 1,200 square feet
$3,500
- Last checked
- Jul 28, 2026
- Notes
- Undated estimate; verify before reliance.
Plans 750 sq ft or less
County impact fee at 750 square feet or less
$0
- Last checked
- Jul 28, 2026
- Notes
- The undated County estimate states that ADUs at or below 750 square feet are exempt.
Unincorporated county
Estimated County ADU impact fee over 750 square feet
$3,061
- Last checked
- Jul 28, 2026
- Notes
- Undated estimate; parcel and project conditions may change applicability.
Unincorporated county
Estimated Planning review
$102
- Last checked
- Jul 28, 2026
- Notes
- First hour; only if departmental review is required.
Unincorporated county
Estimated Addressing review
$60.50 for the first 1/2 hour
- Last checked
- Jul 28, 2026
- Notes
- The cents-based amount is preserved as text.
Unincorporated county
Estimated Public Works review
$164
- Last checked
- Jul 28, 2026
- Notes
- First hour; only if departmental review is required.
Unincorporated county
Estimated Fire Marshal review
$110.00 per hour
- Last checked
- Jul 28, 2026
- Notes
- Fire inspection varies by square footage.
Unincorporated county
Estimated Environmental Resources review
$75
- Last checked
- Jul 28, 2026
- Notes
- First half hour; only if review is required.
Unincorporated county
Estimated new septic system fee
$900
- Last checked
- Jul 28, 2026
- Notes
- Site-specific septic eligibility and additional work are not included.
Official Sources
3 sourcesAccessory Dwelling Units
- Publisher
- Stanislaus County Planning and Community Development
- Last checked
- Jul 28, 2026
Application for Building Permit
- Publisher
- Stanislaus County Planning and Community Development
- Last checked
- Jul 28, 2026
Accessory Dwelling Unit Building Permit Fee Estimate
- Publisher
- Stanislaus County Planning and Community Development
- Last checked
- Jul 28, 2026