San Mateo County · California
Woodside ADU guide: local rules, permits & property planning
Woodside’s ADU guidance emphasizes the land beneath and around the building: slope, geotechnical conditions, stream corridors, septic capacity and fire access can shape the project before a floor plan is chosen.
Local planning guide · Reviewed October 2, 2026
What matters for an ADU in Woodside
Permitting authority: Town of Woodside — ADUs
Official local guidanceLocal rules and design checks
| Topic | Local guidance |
|---|---|
| Site constraints | Screen easements, steep slopes, stream corridors and geotechnical conditions early. |
| Outside agencies | The Town identifies Fire District and County Health review among the potential requirements. |
| Preapproved plans | A site-driven change to a master plan can remove it from the expedited preapproved-plan path. |
Selected local requirements, not a complete zoning determination. Confirm the current rules for your address with the responsible agency.
Fees and budget checks
Use Woodside’s Schedule of Fees and Charges for Town review, then obtain separate estimates for septic or health review, fire requirements and site engineering where applicable. A standard-plan price cannot capture these parcel-dependent items.
Woodside Schedule of Fees and ChargesHow to start the permit process
Discuss site constraints with Town Planning before purchasing plans. Prepare the relevant submittal checklist and identify outside-agency materials before applying for the building permit.
Municipal program guidance
Woodside’s preapproval guidance
The Town warns that standard plans may need changes for local site conditions. Its reviewed page did not list an available Town plan inventory.
View the original sourceWoodside ADU questions
- Should I buy a prefab design before checking the site?
- Woodside recommends discussing the property with Planning first, especially where septic, slopes or access may dictate changes.
- Is there a ready-to-download Woodside plan collection?
- The reviewed Town page did not list plans in its inventory. Confirm availability directly before assuming a catalog option exists.
Sources for this guide
- Town of Woodside — ADUs
- Woodside Schedule of Fees and Charges
- Woodside submittal requirements and forms
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 Woodside 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.