San Diego ADU Permits and Fees: Budgeting for Them
Permit and plan fees are a real line in an ADU budget, and they get paid before construction starts. In San Diego County, the first thing to know is which agency issues your permit, because each one sets its own fees.
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Who issues your ADU permit
It depends on your address, not your mailing city. City of San Diego addresses go through the Development Services Department. Unincorporated areas go through the County of San Diego Planning and Development Services. Chula Vista, Oceanside, Escondido and the other cities in the county run their own permitting.
State law helps on two fronts: it limits impact fees on smaller ADUs, and it requires cities to act on a complete ADU application within a set review period. Confirm the details with your city or county.
At a glance
- City address: City of San Diego Development Services
- Unincorporated: County Planning and Development Services
- Other cities: your own city's permit office
- Paid when: before construction starts
What drives ADU permit and fee cost in San Diego
Fees follow the agency, the size of the unit and the work involved. Ask the agency for its current fee schedule before you set a budget.
| Cost line | What moves it |
|---|---|
| Design and plans | Custom design or a ready made plan, plus engineering |
| Permits and fees | The issuing agency, unit size and plan check rounds |
| Site work and foundation | Grading or drainage the plans must show |
| Utility connections | New or upgraded sewer, water and electrical service |
| Construction | Unit type and size |
| Finishes | Energy and code requirements on fixtures |
Typical price range
A written estimate from a builder who has walked your lot is the most reliable number you can get. Ask for it broken down by the lines above so you can match it to a loan.
Paying for permits and the build
Permit costs come early, so a HELOC that lets you draw now suits many owners. Grant programs may reimburse some predevelopment costs.
San Diego HELOC for an ADU
Draw on your equity as builder invoices arrive.
San Diego ADU grants and programs
Which agencies run ADU programs and how to check status.
ADU cost in San Diego
What moves the price of a San Diego ADU, line by line.
San Diego ADU permit questions
How to get a permit in San Diego?
Find out which agency covers your address, then submit complete plans to it. A designer or builder who has permitted ADUs locally can prepare the application.
Will an ADU fit in my backyard in California?
It depends on lot size, setbacks, easements and where utilities run. A designer, or the agency that issues your permit, can confirm what fits.
What happens if you build an ADU without a permit in California?
The agency can require you to legalize or remove the unit, and unpermitted space can cause problems when you sell, insure or borrow.
Talk to a lender who finances ADUs
Tell us about your project, budget and timeline and we will connect you with a lender who finances ADUs.
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