ADU Design Berkeley
Develop the floor plan, exterior direction, material selections, functionality, and site fit before committing to engineering and construction.
Alameda County · California
Berkeley ADU design & construction
Berkeley mails courtesy notices for ADU applications and assigns a new address to most ADUs. Its August 2026 information sheet provides newer fee figures than the City’s older FAQ PDF.
Local planning guide · Reviewed October 2, 2026
What matters for an ADU in Berkeley
Permitting authority: City of Berkeley — residential additions and ADUs
Official local guidanceLocal rules and design checks
| Topic | Local guidance |
|---|---|
| Courtesy notice | The City notifies neighboring owners and tenants; this is not a discretionary public hearing. |
| Addressing | ADUs other than JADUs need a new address assignment. |
| Unchanged preapproved plans | Berkeley does not accept design changes within its preapproved-plan route. |
Selected local requirements, not a complete zoning determination. Confirm the current rules for your address with the responsible agency.
Fees and budget checks
The August 20, 2026 sheet lists a $250 zoning plan-check fee and $500 neighbor-notice fee. The City also lists $250 for address assignment; valuation-based building fees and applicable school fees are additional.
Berkeley ADU information sheet — August 2026How to start the permit process
Submit the building application through Permits Online or the Permit Service Center. Coordinate the recorded documents, courtesy notice and address assignment before permit issuance and final inspection milestones.
Municipal plan program
Berkeley preapproved-design discount
The City advertises a plan-check fee at 50% of the usual cost for qualifying preapproved designs. Changing the design returns it to the normal application process.
View the original sourceBerkeley ADU questions
- Can a neighbor appeal the ADU courtesy notice?
- The City describes objective, ministerial ADU review and says approved ADU permits are not appealable.
- Can I customize a Berkeley preapproved design?
- The City says design changes must be submitted as a new design under normal processing.
Sources for this guide
- City of Berkeley — residential additions and ADUs
- Berkeley ADU information sheet — August 2026
- Berkeley preapproved-design discount
Local sources reviewed October 2, 2026. Historical examples retain their stated dates. Contact ADU California Inc. to confirm project availability; this guide does not establish an office location or property approval.
Design-led ADU planning
ADU design, architecture & engineering coordination in Berkeley
Start with ADU design in Berkeley, then coordinate architect and engineer scope, permitting, budgeting, and the custom builder or contractor work needed to move the project toward construction.
ADU Architect Berkeley
Architectural planning can address layout, massing, code constraints, site relationships, and permit drawings where an appropriately licensed professional is required.
ADU Engineer Berkeley
Engineering coordination can cover structural, foundation, utility, civil, energy, and other disciplines required by the property and permitting authority.
Custom ADU Builder Berkeley
Compare custom scope, site constraints, model options, finish level, construction sequence, and written pricing before selecting a build approach.
ADU Contractor Berkeley
Coordinate construction scope, subcontractors, schedule, inspections, site logistics, and closeout around a clearly defined permitted set.
ADU Design Build Berkeley
A coordinated design-build workflow keeps property review, design, engineering, permitting, budgeting, procurement, and construction aligned.
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 Berkeley 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.