ADU permit process in Milpitas, California

Last verified August 29, 2026

Prepared by GetYourPermit editorial teamReport an error

This guide includes the portions of the City permit process that passed our evidence review. Confirm project-specific requirements with the City before submitting.

Where to apply

Department: Office of Building Safety / Building Department
Permit portal: City Online Portal System
Contact: 408-586-3240 BuildingPermitCenter@milpitas.gov

Step by step

1
Confirm pre-approved-plan site eligibility when applicable
For a City pre-approved detached plan, check parcel restrictions and selected plan eligibility Use ADU Monday appointment or contact named City departments for project-specific questions Eligibility determination needed before pre-approved-plan application
2
Submit Building Permit application online
Prepare the Building Permit submittal package For pre-approved plans, include site-specific plans Submit online to the Building Department Online Building Permit application
3
City plan review under applicable program conditions
Respond to City requests if issued City review result or further applicant action
4
Schedule Building inspection when work is ready
Schedule online through eTRAKiT Keep approved plans and permit card available, provide site access, complete requested corrections Inspection request and City inspection result

What you need to submit

JADU Deed Restriction Form — only in some cases
Pre-approved ADU site-specific plan submittal package

Pre-approved ADU plans

Use Milpitas’s official page to confirm which designs, site conditions, and supplemental documents qualify. Plan-check timing still depends on the project and city review.

View pre-approved plans

Project-specific next step

Build your Milpitas permit report

Choose your ADU type and size to bring the City process, researched permit fees, and early construction budget into one planning report.

Start my permit report

Sources for this guide

Additional city reference pages

CityBuilding Fee Schedule
The current Building Safety schedule is effective August 3, 2026 and includes a New Residential table expressly covering additional dwelling units.
Accessed August 28, 2026
CityADU Incentive Program
The City states current Community Investment Fund support can cover permit costs for eligible ADU/JADU projects on single-family or duplex lots until funds are exhausted.
Accessed August 28, 2026