How Long Does It Take to Get a JADU Permit?

One of the first questions homeowners ask when planning a Junior Accessory Dwelling Unit (JADU) is: How long does the JADU permit process take?

While timelines vary based on the city and project details, using a preapproved ADU plan, a clear ADU blue print, and permit ready ADU plans can significantly shorten the process.

Typical JADU Permit Timelines

• Well-prepared applications: 4 to 8 weeks

• Applications needing major corrections: 2 to 4 months

Submitting complete documents and designs aligned with code greatly impacts how fast your JADU permit gets approved.

Factors That Affect JADU Permit Timing

1. Completeness of Application

Submitting:

• A full site plan

• A detailed ADU blue print

• Title 24 energy compliance documents

• Ownership affidavits

helps move your file to the top of the review queue.

2. Use of Preapproved Plans

Cities often offer preapproved ADU plans. Using one means:

• Less design review time

• Fewer required corrections

• Faster approval, sometimes within just 4–6 weeks

3. City or County Workload

Busy cities like Los Angeles or San Diego may experience delays, while smaller towns might process JADU permits faster. Checking local permitting timelines early sets realistic expectations.

4. Complexity of Construction

Simple interior conversions are much faster than:

• JADUs requiring exterior modifications

• JADUs needing major utility upgrades

Aligning your project with permit ready ADU plans simplifies approvals.

How to Speed Up the JADU Permit Process

• Use a preapproved ADU plan designed for your city

• Submit a complete package on first attempt

• Respond quickly to any city correction requests

• Work with experts who specialize in ADU permit preparation

Professional preparation — especially using a strong ADU blue print — can save months of frustration.

Real-World Example

A homeowner in Santa Barbara County prepared a full permit package using a permit ready ADU plan and a detailed ADU blue print.Result:

• First review completed in 3 weeks

• Minor corrections addressed in 5 days

• Final JADU permit issued within 6 weeks total

Common Mistakes That Delay Permits

• Incomplete floor plans

• Missing Title 24 energy documents

• No owner occupancy affidavit

• Plans not matching zoning setbacks

Final Thoughts

Understanding the JADU permit timeline helps homeowners plan their projects realistically and avoid unnecessary delays. At ADUnest, we help clients speed up the process with properly prepared ADU blueprints, access to preapproved ADU plans, and complete permit ready ADU plans designed for quick approvals.If you have questions about JADU permitting timelines, feel free to leave a comment below — the ADUnest team will get back to you quickly to help you move forward!