City program

Pre-Approved ADU Plans in Modesto, California

Browse official and accepted pre-approved ADU plans for Modesto, California. Compare plan size, bedrooms, providers, approval status, official source links, permit requirements, and fees.

Program status: source-backed listings Last checked Jul 28, 2026

Program Overview

This Modesto page summarizes source-backed pre-approved ADU plan listings for Modesto, California, using official records tied to City of Modesto. The current export lists 8 accepted plans from 1 provider; provider names include Timothy P. Huff & Associates, Inc. (TPH Architects). The accepted listings originate from Stanislaus County, California, USA. Plan records cover 260 to 1,192 sq ft and 1 bedroom to 3 bedrooms where those fields were listed by the source.

Permit and fee context is kept separate from plan acceptance. The data export includes 10 permit requirement records and 5 fee records for Modesto. Permit requirement records include Site plan, Planning and zoning review, and others. Fee records include Partner pre-approved plan cost, New ADU street address, and others. When a source did not publish a value, the page keeps that field as Not listed in source instead of filling a blank.

Use these listings as a starting point for matching a plan to a property. Source links, checked dates, acceptance notes, and provider records are shown so you can verify whether a plan remains accepted locally, what site-specific review remains, and whether local fees, plan licensing, or provider terms apply. A listing in this directory does not guarantee permit approval for a specific parcel.

Summary

Location
Modesto, Stanislaus County, California, USA
Accepted plans
8 accepted plans
Providers
1 provider
Origin programs
1 program
Plan size range
260 to 1,192 sq ft
Permit sources
4 sources

How to use this page

  1. Pick a plan size and bedroom count.
  2. Check whether the plan originated locally or is accepted from another city/county program.
  3. Open the official source.
  4. Confirm current status with the local building department.
  5. Ask the provider what site-specific work, plan licensing, engineering, and utility review are still required.

Accepted Plans

8 plans

Permit Requirements

10 requirements

All

Site plan

Official city source

Show property boundaries and the placement and size of the existing house and all structures.

Last checked
Jul 28, 2026
Notes
Required before relying on any standard design.

Site specific

Planning and zoning review

Official city source

Confirm setbacks and other zoning requirements with the City Planning Division.

Last checked
Jul 28, 2026
Notes
A listed or pre-approved design does not establish parcel eligibility.

All

Permit submittal package

Official city source

Complete plans, energy calculations, truss calculations, and structural calculations.

Last checked
Jul 28, 2026
Notes
The public floor/elevation PDF alone is not the complete listed package.

All

Building permit and City review

Official city source

Apply for an ADU building permit; City staff review the plans before permit issuance.

Last checked
Jul 28, 2026
Notes
Fees must be paid before issuance and inspections follow.

Detached

Second-story garage review

Official city source

A second-story garage ADU may require administrative review when neighboring properties are all single-story.

Last checked
Jul 28, 2026
Notes
Material to the 798 SF two-story above-garage design.

All

ADU Express eligibility

Official city source

Participation does not guarantee approval; all plans must comply with zoning, building, and safety requirements.

Last checked
Jul 28, 2026
Notes
Same-day approval is limited to qualifying, complete projects.

Fees

5 fee records

All

Building permit and plan-review fees

Official city source

Variable; use the City of Modesto real-time Permitting Fee Estimator.

Last checked
Jul 28, 2026
Notes
No current static FY 2026-27 ADU total was identified.

Official Sources

4 sources

Modesto ADU FAQ

6 answers

Does Modesto have accepted or pre-approved ADU plans in this directory?

Yes. The current Modesto, California page lists 8 accepted plans from 1 provider in the source-backed export.

What ADU plan sizes are listed for Modesto?

The listed Modesto plan records range from 260 to 1,192 sq ft. Use the individual plan cards to confirm bedrooms, bathrooms, plan documents, and provider details because some fields are not listed by every official source.

Where do the Modesto ADU plan records come from?

They are tied to 4 official sources in this page's source set, including City of Modesto. Each plan, fee, and permit note should still be checked against the linked official source before use.

Can Stanislaus County or nearby city ADU plans be used in Modesto?

This page includes plans accepted for Modesto that originated in Stanislaus County. That does not mean every Stanislaus County or nearby city plan applies in Modesto; rely on the accepted-plan record and official source link for each listing.

Do pre-approved ADU plans guarantee permits in Modesto?

No. A source-backed accepted plan can reduce plan review work, but Modesto can still require site-specific review, zoning checks, fees, utility coordination, and current code compliance. This page lists 10 permit requirements to help flag items to verify with the local building department.

Are Modesto ADU permit fees and requirements listed?

This page includes 5 fee records and 10 permit requirements for Modesto. These are source-backed summaries, not a final permit quote or approval checklist.