Solar Design Services in California

Proposal design for the sales stage, permit plan sets for California authorities, 3D pre-design and shade studies, detailed engineering for rooftop and ground mount, civil and structural engineering with STAAD Pro verification, and yield and technical reports. Most California installers start with one service and expand once turnaround and quality are proven.

Yes, and it is the substance of the work rather than a claim. California builds on the National Electrical Code through the California Electrical Code, then layers the Title 24 energy standards and the California Fire Code on top. Three documents govern a single rooftop array, and the fire code is usually what reshapes the layout.

Pacific Gas and Electric, Southern California Edison, San Diego Gas and Electric, LADWP, SMUD. Each expects its own diagram format and documentation, and export rules differ between them, which changes both the sizing case and what the drawings must show.

California carries the largest installer population in the country and the deepest competition, which means turnaround is a commercial weapon rather than a convenience. The shift to net billing under NEM 3.0 changed the economics: export credit fell sharply, self-consumption became the value driver, and battery attach rates rose steeply. Most residential work here is now solar plus storage, and that pulls NEC 706 and load calculations into sets that used to be array-only.

Yes. Commercial and industrial work brings structural calculations, equipment coordination and interconnection complexity. Our largest documented project is an 11 MW DC rooftop installation on tin shed structures, which required structural verification across dozens of shed roofs alongside the electrical design.

A second engineer reviews every set against a jurisdiction specific checklist before it leaves us. The reviewer is not the person who drew it, because the fastest way to miss a setback error is to check your own work. Structural output is verified in STAAD Pro rather than assumed from a racking table.

You do. Work is covered by NDA and all intellectual property in the deliverables transfers to you. We do not reuse your drawings, your customer data or your templates for anyone else.

Yes. No retainer, no minimum volume, no onboarding fee. Most clients send one project, check the output, then scale.

Wind: generally 85 to 110 mph design wind speed, higher through mountain passes and the Banning corridor. Snow: negligible on the coast and in the valleys, significant in the Sierra Nevada where ground snow loads climb steeply with elevation. Seismic: seismic design categories D through E across most populated areas, the highest routine seismic demand in the country. Also governing: wildfire urban interface zones add fire access and material requirements, and coastal sites need corrosion consideration. These decide the racking selection and attachment schedule, so we verify them per site rather than applying a regional default.

Title 24 Part 6 energy standards, including solar-ready and PV mandate provisions. California Fire Code Chapter 12 ridge setbacks and access pathways. California Residential Code structural provisions. Local seismic plan-check overlays, notably in Los Angeles. We work from these rather than a national template, because each can produce a review comment on an otherwise sound design.

Los Angeles Department of Building and Safety (City of Los Angeles): structural plan check applies to rooftop systems regardless of size because of seismic design category. Expect the framing detail to be examined closely. San Diego Development Services Department (City of San Diego): runs an established expedited residential pathway, but combination permits for solar plus storage are reviewed as a single package. San Francisco Department of Building Inspection (City and County of San Francisco): dense urban roofs, frequent historic overlays, and fire access pathways that often decide the module count outright. Los Angeles County Public Works (Unincorporated LA County): separate from LADBS with its own submittal route. Confusing the two is a common first-time filing error. Sacramento County Building Permits (Sacramento region): coordinates with SMUD rather than an investor-owned utility, so the interconnection paperwork differs from PG&E territory.

Net billing credits exports at hourly avoided cost rather than retail, so value comes from consuming your own generation instead of sending it to the grid. In practice that means most systems now include a battery, the array is sized against the load profile rather than annual consumption, and the plan set carries NEC 706 storage scope plus a load calculation that array-only sets did not need.

Ridge setbacks and access pathways sized so firefighters can reach and ventilate the roof, with clearances at hips and valleys. The practical effect is that the compliant layout is usually smaller than the geometrically possible one. We resolve setbacks before finalising module count, because doing it the other way round is how a customer signs for a system that then loses rows at plan check.