Contra Costa County · California
Danville ADU guide: local rules, permits & property planning
Danville pairs its ADU ordinance with an outside-agency checklist and an online permit portal. Its advertised Accelerator rebate had a September 30, 2026 end date, so a new budget should not assume that funding remains available.
Local planning guide · Reviewed October 2, 2026
What matters for an ADU in Danville
Permitting authority: Town of Danville — ADUs
Official local guidanceLocal rules and design checks
| Topic | Local guidance |
|---|---|
| Rental term | The Town’s guidance requires ADU and JADU rental terms longer than 30 days. |
| Drawing changes | Changes to an existing design should go back to its architect and engineer of record. |
| Agency coordination | Use the Town’s outside-agency checklist to identify approvals beyond the building permit. |
Selected local requirements, not a complete zoning determination. Confirm the current rules for your address with the responsible agency.
Fees and budget checks
Request current permit charges from the Town Permit Center. The published Accelerator program period ended September 30, 2026, or earlier if exhausted. Do not deduct a rebate without written confirmation of an applicable reservation or extension.
Danville Accelerator program dates and conditionsHow to start the permit process
Compile the Town’s building submittal requirements, plot plan and applicable outside-agency materials, then apply through Danville’s CSS portal. Keep any rebate reservation and occupancy deadlines separate from permit approval.
Historical municipal program
Danville Accelerator program record
The published program linked rebates to size, affordability restrictions and final occupancy. It is a dated incentive example, not an offer of new funding as of this review.
View the original sourceDanville ADU questions
- Can I budget a new Accelerator rebate now?
- The posted program period has ended. Ask the Town about extensions or an existing reservation before including a rebate.
- Who should revise a reused plan?
- Danville directs applicants to the architect and engineer of record; revisions are at the applicant’s expense.
Sources for this guide
- Town of Danville — ADUs
- Danville Accelerator program dates and conditions
- Danville ADU guidance and forms
- Danville Permit Center
Local sources reviewed October 2, 2026. Historical examples retain their stated dates. Contact ADU California to confirm project availability; this guide does not establish an office location or property approval.
A useful first review
Separate what is available from what still needs verification.
01
Confirm the property
Start with a complete address and review the available parcel, building, and map context.
02
Identify the unknowns
Keep missing setbacks, easements, utilities, access, hazards, and local requirements visible.
03
Choose the next review
Use the preliminary result to prepare a focused conversation with the required professionals and agencies.
Explore project types
Compare the scope before choosing a solution.
These pages explain the questions each project type introduces. They do not assert that a particular scope is permitted or suitable for your address.
Compare planning footprints
See common ADU sizes before choosing a design.
These model pages are planning references only. They are not a statement that a particular size is allowed or buildable at a Danville address.
California directory
Explore more city guides.
The next useful action
Put your address at the center of the conversation.
The online review is preliminary and is not a permit decision, survey, engineering opinion, construction document, final price, or guaranteed schedule.