Step-by-Step Guide to JADU Permits

Building a Junior Accessory Dwelling Unit (JADU) is an exciting way to maximize your property’s potential. However, many homeowners wonder: What are the exact steps to successfully obtain a JADU permit?

Following a clear roadmap — and using a preapproved ADU plan, a professional ADU blue print, and permit ready ADU plans — can dramatically simplify the journey.

Step 1: Confirm Property Eligibility

Before you start designing:

• Check that your property is zoned for single-family residential use.

• Confirm that the JADU will be created within the existing home or attached garage.

• Verify that the planned unit will not exceed 500 square feet.

Step 2: Design Your JADU Layout

Prepare a design that includes:

• An independent exterior entrance

• An efficiency kitchen

• Either a shared or separate bathroom

Using a preapproved ADU plan that already meets these requirements can save weeks of design corrections.

Step 3: Prepare a Complete Permit Application

Typical JADU application packets include:

• Completed permit application forms

• Site plan showing the entire lot and structures

• Detailed ADU blue print with room dimensions

• Title 24 energy compliance forms

• Owner occupancy affidavit

• Deed restriction agreement

Cities often move faster when the application uses permit ready ADU plans.

Step 4: Submit the Permit Application

• Submit the complete package to the local building department.

• Pay plan review and permit fees.

• Respond quickly to any city correction comments.

Fast responses keep the review process moving.

Step 5: Address Corrections (If Any)

City reviewers may request minor changes, such as:

• Adjusting window sizes for egress compliance

• Clarifying kitchen appliance specifications

Plans based on permit ready ADU plans usually require fewer corrections.

Step 6: Obtain the Permit and Begin Construction

Once approved:

• Post the permit on the job site.

• Begin construction according to the approved ADU blue print.

• Schedule inspections at key stages (framing, plumbing, final).

Step 7: Final Inspection and Occupancy

After passing all inspections:

• Receive a Certificate of Occupancy.

• Legally rent out or use your JADU as living space.

Real-World Example

In San Jose, a homeowner used a city-approved preapproved ADU plan and submitted a complete application with an organized ADU blue print. Their JADU permit was approved within six weeks, and construction began without any costly redesigns.

Common Mistakes to Avoid

• Forgetting to include the separate exterior entrance

• Designing over 500 square feet

• Omitting energy efficiency documentation

• Submitting incomplete floor plans

Final Thoughts

Following a clear, strategic process for obtaining a JADU permit saves time, prevents frustration, and speeds up construction. At ADUnest, we guide homeowners through every step — from preparing accurate ADU blueprints to offering preapproved ADU plans and delivering permit ready ADU plans built for fast approvals.If you have questions about your JADU permit journey, leave a comment below — the ADUnest team is ready to assist you right away!