What happens if you skip the permit (and you needed one)
- Stop-work orders cost $500–$2,000 in fines plus forced removal or costly remediation if the ADU fails inspection after completion.
- Insurance claim denial: most homeowner policies exclude unpermitted structures, leaving you uninsured for liability, fire, or theft—and lenders will demand removal before refinance.
- Seller disclosure at sale: California requires disclosure of unpermitted work (TDS 3.7); buyer can sue for rescission or damages, often $50K–$150K+ for a full detached ADU.
- Rental-income tax audit trigger: income from unpermitted rental ADUs raises red flags with the IRS and California Franchise Tax Board; penalties can exceed the unpermitted-work cost.
El Cajon ADU permits — the key details
Every ADU in El Cajon requires a building permit, regardless of type: detached new-construction, existing-garage conversion, junior ADU (410 sq ft or less, no separate kitchen), or above-garage unit. California Government Code 65852.2 mandates that cities allow ADUs in single-family zones, and AB 881 (effective January 1, 2024) further strips away local restrictions on owner-occupied primary-unit ADUs and junior ADUs. However, El Cajon's local ADU ordinance still governs design standards, setbacks, utility connections, and parking—so you cannot bypass the permit. The city Building Department applies a 60-day shot clock per AB 671: once your application is deemed 'complete,' the city has 60 calendar days to issue, issue with conditions, or deny. In practice, 'complete' means you've submitted architectural plans (minimum 1/4-inch scale site plan showing lot lines, proposed ADU footprint, setbacks, parking, utilities, and drainage), a Title 24 energy-compliance form, utility letters from the water and sewer districts, and the application fee. Incomplete submissions reset the clock, so clarity upfront saves 2–3 weeks.
Contact city hall, El Cajon, CA
Phone: Search 'El Cajon CA building permit phone' to confirm
Typical: Mon-Fri 8 AM - 5 PM (verify locally)