ADU Permit Services in San Diego

Yes, converting a garage into living space requires a building permit everywhere in San Diego County, in both city and unincorporated areas. The application needs a complete drawing set showing the new floor plan, egress windows, insulation, electrical, and any plumbing additions. BluPlan Studio prepares the drawings and manages the submittal from start to approval.

Yes, California ADU law prohibits cities from requiring replacement parking when you convert a garage to an ADU. The rule applies to attached and detached garages throughout San Diego County, and it makes conversions significantly more feasible than they were under older local parking rules.

In 2026, contractors in San Diego typically price garage conversion construction around $350 per square foot, so a 400 square foot two-car garage lands near $140,000 to build out. Plan and permit packages from BluPlan Studio start at $8,500, and every project gets a fixed, itemized quote at your free consultation. The final number depends on your garage's existing condition and whether you are adding a kitchen and bathroom for a full ADU.

California law requires cities to act on a complete ADU permit application within 60 days. Real projects usually take longer once correction cycles are counted: our Thirty-Nine garage conversion in San Diego went from first submittal to approved permits in about 3.5 months. A complete, accurate drawing set is the biggest factor in keeping that timeline short.

A garage conversion costs less than a new ADU for almost every San Diego property because the foundation, framing, and roof already exist and are the most expensive parts of any build. Conversion construction runs about $350 per square foot with most contractors, while a detached new build carries a meaningfully higher cost per square foot once you add ground-up structure, utility trenching, and site work. ADUs under 750 square feet are also exempt from development impact fees, an exemption nearly every garage conversion qualifies for.

To legalize an unpermitted garage conversion, you document the existing space with as-built drawings, bring anything below code up to standard, and submit plans to your city for retroactive approval. This is one of BluPlan Studio's most requested services. A legalized conversion protects you during a sale, makes the space insurable, and can qualify it as a permitted ADU.

Yes, pre-approved ADU plans still need a site plan and Title 24 energy calculations specific to your property. Pre-approved plans cover the building design itself, but every San Diego submittal also requires a site plan showing boundaries, setbacks, and utilities, plus Title 24 compliance documentation for the new conditioned space. We prepare both as part of any permit package.

Every ADU requires a building permit from your city's building department, which covers the structure, electrical, plumbing, and mechanical work. Depending on your property you may also need related approvals: a Coastal Development Permit in the Coastal Zone, school and utility fee processing, or fire department review. We identify exactly which approvals your property needs and handle all of them as one package.

We provide construction drawings for ADUs, additions, remodels, garage conversions, and new construction, including floor plans, elevations, sections, site plans, and structural details.

Costs depend on project scope, whether structural engineering is involved, and your city's submittal requirements. We provide a fixed, itemized quote during your free consultation so you know your full cost before committing.

Yes. Properties in the California Coastal Zone (including much of La Jolla, Pacific Beach, Ocean Beach, and Imperial Beach) may need a Coastal Development Permit in addition to the standard building permit. We prepare the documentation and coordinate the coastal review alongside your city permit.

Yes. As-built plans document your home's existing conditions and are required when you remodel without original plans, legalize unpermitted work, or sell a property with undocumented changes. We measure the property and produce accurate as-built drawings accepted by San Diego County building departments.

A site plan for permit typically includes property boundaries, existing structures, proposed additions or ADUs, setbacks, utility locations, drainage, and any grading information required by the building department. We prepare site plans to meet the specific requirements of each San Diego County jurisdiction.