The Solar Installation Process in California: Step by Step for Temecula and Murrieta Homeowners

Adrian Marin|Independent Solar Advisor, Temecula CA

Helping Riverside County homeowners navigate SCE rates and solar options since 2020

Most homeowners expect to sign a contract and have panels on the roof within a few weeks. The real timeline in SW Riverside County is 60 to 90 days, and most of that time is waiting, not working. Here is exactly what happens at each stage, what you need to do, and what can slow things down.

The Full Timeline at a Glance

A typical residential solar installation in Temecula or Murrieta moves through six stages from contract signing to your first day generating power: site survey and engineering, permit application, utility interconnection application, installation day, city inspection, and SCE Permission to Operate. Each stage has a different timeline and a different party responsible for moving it forward.

Total time from contract to Permission to Operate typically runs 60 to 90 days for straightforward projects in Temecula and Murrieta. Complex projects, those requiring HOA approval, roof repairs, or main panel upgrades, routinely take 90 to 120 days. Here is what drives each window.

Stage 1: Site Survey and System Engineering (Days 1 to 14)

Within one to two weeks after signing, your installer sends a technician to your home for a site survey. This is not a sales visit. The technician physically measures your roof dimensions, checks the pitch and condition, photographs the main electrical panel, confirms the location of the meter, and often flies a drone to document shading from trees and neighboring structures.

The survey data goes to an engineer who designs the final system layout, specifies the racking configuration, and produces the set of drawings required for the permit application. This engineering package typically takes one to two weeks to complete after the survey.

What you need to do at this stage:

• Be home or arrange access for the site survey appointment.
• Clear the area around your main electrical panel if it is in a garage or utility room.
• Tell the installer about any recent roof work, known panel issues, or planned roof replacement within the next few years.

Stage 2: Permit Application with the City (Days 10 to 35)

Solar installations in Temecula require a building permit from the City of Temecula. Murrieta installations go through the City of Murrieta. Both cities process residential solar permits, though timelines differ. Temecula's building department has been issuing solar permits on an over-the-counter or same-day electronic review basis for straightforward residential projects in 2025 and 2026. Murrieta similarly offers expedited review for standard residential systems.

In practice, your installer submits the permit application electronically, and the review period runs two to four weeks. For projects flagged for additional review, such as roofs with complex geometries, older electrical panels, or systems requiring a load calculation addendum, the timeline can extend to four to six weeks.

The homeowner does not need to do anything during the permit stage. Your installer manages the submission and responds to any plan check corrections. If corrections are requested, expect one to two additional weeks for the revised submission.

Stage 3: SCE Interconnection Application (Concurrent with Permitting)

Your installer submits an interconnection application to Southern California Edison at roughly the same time as the permit application. This application requests approval for your solar system to connect to the SCE grid and operate under the Net Energy Metering program.

SCE reviews the application to confirm the proposed system does not exceed their technical thresholds for the local distribution circuit. For most residential systems under 10 kW in established neighborhoods, SCE issues a conditional approval within 10 to 30 business days. Larger systems, or systems in areas where the local grid circuit is already near capacity, can take longer and may require a more detailed engineering review.

SCE interconnection queue backlogs have been a documented delay factor in California. In periods of high installation volume, conditional approvals that normally take three weeks have taken six to eight weeks. Your installer should flag this risk if the local circuit queue is known to be backed up at the time of your application.

Stage 4: HOA Approval (If Required)

If your home is in a community governed by a homeowners association, you need HOA approval before installation. California law, under Civil Code Section 714, limits the ability of HOAs to prohibit solar installations and restricts them from imposing requirements that add more than $1,000 to system cost or reduce output by more than 10 percent. HOAs cannot deny approval outright, but they can specify mounting requirements, panel placement preferences, and color standards for conduit and hardware.

HOA review timelines vary widely. Some associations in Temecula and Murrieta process solar applications within two to three weeks. Others with quarterly board meeting schedules or slow administrative response times can take 45 to 60 days. This is one of the most variable factors in the total project timeline, and it runs concurrently with permitting if you submit both applications simultaneously.

If you live in an HOA, ask your installer to submit the HOA application and the city permit application at the same time, not sequentially. Serial processing can add six to eight weeks to your project timeline unnecessarily.

What Can Delay Your Project (And by How Much)

Beyond HOA timing and SCE queue backlogs, four other issues commonly push project timelines past 90 days:

• Roof condition: if the site survey finds that the roof has less than five to eight years of remaining life, most reputable installers will require a reroofing before installation. A new roof adds two to six weeks and $8,000 to $20,000 to the project. Discovering this after contract signing delays everything downstream.
• Main panel upgrade: homes with 100-amp service panels often need an upgrade to 200 amps to safely accommodate a solar inverter and, if included, an EV charger or battery. Panel upgrades require separate electrical permits and add two to four weeks.
• Permit corrections: if the city's plan check reviewer requests corrections to the engineering drawings, the permit application goes back to the engineer, gets revised, and is resubmitted. One round of corrections typically adds two to three weeks.
• Equipment availability: supply chain disruptions affect specific inverter and panel models. If the system designed for your roof uses a model that is on backorder, the installer must either substitute an equivalent product or wait. Substitutions require updated engineering drawings and sometimes a revised permit.

Stage 5: Installation Day

Once the permit is in hand and SCE has issued conditional interconnection approval, your installer schedules the installation. Crew size varies by company and system size, but a typical residential installation in Temecula involves three to five workers.

For a standard single-story home with a straightforward roof pitch and no main panel upgrade, installation typically takes one full day of eight to ten hours. Two-story homes, complex rooflines, or systems that include battery storage commonly take one and a half to two days. Projects with a simultaneous main panel upgrade may require a second crew and extend to two to three days.

What installation day looks like:

• The crew arrives early, typically between 7 and 8 am.
• Roof work begins first: racking hardware is attached to the roof structure through the roofing material, panels are mounted, and wiring runs from the roof to the inverter location.
• At some point during the day, the crew needs to turn off the main breaker for one to three hours to connect the inverter and disconnect hardware safely. You will be without power for that window. Plan accordingly for refrigerators, medical equipment, and work-from-home needs.
• The inverter and any battery hardware are mounted, typically in the garage or on an exterior wall near the main panel.
• At the end of the day, the crew confirms all components are properly wired but does not energize the system. The panels and inverter sit ready but off until after the city inspection.

You do not need to be home for the entire day, but you or an authorized adult should be present when the crew arrives and when they finish. The site should be accessible throughout the day.

Stage 6: City Inspection (Days After Installation)

After installation, your installer schedules a final inspection with the city. A building inspector visits the property to verify that the installation matches the approved permit drawings and meets electrical code requirements. In Temecula and Murrieta, residential solar inspections are typically scheduled within five to ten business days of the request.

The inspection itself takes 20 to 45 minutes. The inspector checks the roof penetrations, conduit runs, inverter installation, labeling on all electrical components, and confirms the disconnect is accessible. If everything passes, the inspector signs off and the city issues a final permit sign-off.

If the inspection fails, the installer corrects the flagged items and reschedules. A reinspection adds five to ten more business days to the timeline. Inspection failures are uncommon for experienced installers but do happen, usually for minor labeling deficiencies or conduit routing issues.

Stage 7: SCE Permission to Operate

After the city inspection passes, your installer submits the final interconnection package to SCE. This package includes the signed permit, inspection sign-off, and a request for Permission to Operate (PTO). SCE reviews the documentation and, if everything is in order, issues the PTO letter by email.

PTO processing time in SCE territory currently runs two to four weeks from submission. Do not turn on your solar system before receiving the PTO letter. Operating a solar system without PTO violates your interconnection agreement and can result in penalties or delays in establishing your NEM account.

When you receive the PTO letter, your installer activates the system and walks you through the monitoring app. You will see real-time production data within hours. Your first SCE bill after PTO will begin crediting your NEM account for production.

After PTO: Your First SCE Bill Under NEM 3.0

Under NEM 3.0, SCE bills solar customers monthly and settles the annual NEM account at the end of a 12-month true-up period. Each monthly bill shows your net consumption: energy imported from the grid minus energy exported. You pay only for net imports at the current TOU rate. Exports are credited at the Avoided Cost Calculator rate, which is substantially lower than the retail rate.

Your first bill after PTO may still show a balance if the system went live mid-billing cycle or if early production is lower than expected due to seasonal factors. January through March production in Temecula runs 60 to 70 percent of peak summer levels due to shorter days and lower sun angles. If you activate in winter, the first few bills may not reflect the full annual savings your system is designed to deliver.

Set up your monitoring app (Tesla, Enphase Enlighten, SolarEdge, or whatever your system uses) during the activation walk-through. Monitor daily production during the first two weeks. If production is consistently lower than the estimates in your contract, contact your installer to confirm the system is configured correctly and all panels are producing.