The Step-by-Step Guide to Getting a Building Permit in San Diego
Planning to build an ADU (Accessory Dwelling Unit) or begin a home remodel in San Diego? Whether you’re updating your kitchen, adding a second story, or creating a rental-ready backyard unit, one of the most important steps is securing your San Diego building permit.
At Romex Design, we specialize in helping homeowners across the region navigate the design and permitting process with confidence. Below is our clear, step-by-step guide to help you understand what to expect—and how to avoid unnecessary delays.
Step 1: Know When You Need a Permit
Not every home improvement requires a permit, but most structural, electrical, plumbing, and major remodeling projects do. You will likely need a permit for:
Building a new ADU in San Diego
Interior or exterior home remodels that alter walls, windows, or utilities
Room additions, garage conversions, or accessory structures
Any project affecting safety, energy efficiency, or egress
Still not sure? Romex Design will help you assess your project and identify which permits apply—before any designs are finalized.
Step 2: Start with a Professional Design Plan
The City of San Diego requires detailed architectural drawings and Title 24 energy reports for permit approval. This is where many homeowners get stuck.
Romex Design provides permit-ready plans that are tailored to your site, goals, and city requirements. Our architectural design team works with you to develop:
Scaled floor plans
Site plans
Elevations and building sections
Structural coordination as needed
Title 24 energy compliance documentation
Having a complete and accurate plan set is the #1 way to avoid delays in permitting.
Step 3: Submit Your Plans to the City of San Diego
Once your plans are complete, they must be submitted to the City of San Diego’s Development Services Department (DSD). Depending on the project, you can submit:
Online via the City’s permitting portal
In person at the downtown permitting center
Romex Design handles this process on your behalf, ensuring your documents are submitted correctly and efficiently.
Step 4: Wait for Plan Review and Respond to Corrections
After submission, the City will assign a plan checker to review your documents. Typical review timelines can range from 2 to 8 weeks, depending on the scope of the project and permit volume.
Most submissions receive at least one round of corrections. This is completely normal.
At Romex Design, we quickly address and resubmit any required changes. Our experience with San Diego ADU and home remodel projects means we know what the city looks for—and how to avoid repeated rejections.
Step 5: Get Your Permit and Begin Construction
Once your plans are approved, you’ll receive your official building permit. This allows your general contractor to begin construction legally.
Romex Design can also help you connect with experienced San Diego builders we trust. We make sure your design translates smoothly into real-life execution.
Bonus: Streamlined Permitting for San Diego ADUs
Did you know the City of San Diego has a streamlined permitting process for ADUs? Under California law, cities must simplify ADU approvals and waive certain fees. However, you still need a complete, code-compliant plan set and coordination with the city.
Romex Design specializes in ADU design in San Diego and can help you:
Determine what kind of ADU you can build
Maximize your space and layout
Get through the city approval process with minimal delays
Final Thoughts: Make Permitting Easier with Romex Design
Getting a building permit in San Diego doesn’t have to be complicated—when you have the right team behind you. At Romex Design, we make sure your San Diego ADU, home remodel, or addition project is fully permitted, code-compliant, and designed for real life.
Let’s bring your vision to life—from idea to approval.
Ready to get started?
Contact Romex Design today for a free consultation and let’s talk about your project.
