Quick Answer: The best time to add solar during a home renovation is before or during a roof replacement — you avoid the cost of removing panels from an old roof when it eventually needs replacing. The solar installation sequence during a renovation is: (1) Complete roof replacement first if the roof is under 10 years of remaining life; (2) Install rooftop solar (typical 6-10 kW system, 16-28 panels) while scaffolding is still up or before landscaping/hardscape work begins; (3) Coordinate the electrical sub-panel upgrade (usually to 200-amp if not already) as part of the same permit pull to reduce inspection costs. In San Jose, solar permits go through the city’s PBCE office and typically take 2-6 weeks. PG&E interconnection approval takes an additional 30-90 days before the system can go live.
Solar During a Renovation — Step-by-Step Guide for San Jose 2025
Helpful Resources:
- Assess roof condition: A solar system lasts 25-30 years. If your roof is more than 10-15 years old, replace it during the renovation before adding solar. Removing and reinstalling panels for a roof replacement 5 years later costs $2,000-$5,000 extra. A new roof + solar in one project saves that cost
- Size the system for your future load: If the renovation adds square footage (room addition, ADU), size the solar system for the expanded home — not your current electricity bill. Add 20-30% extra capacity to account for an EV charger if you don’t have one yet
- Coordinate electrical panel upgrade: Most older San Jose homes have 100-amp panels. A solar installation plus EV charger plus HVAC upgrade often requires upgrading to 200-amp service. Do it during the renovation so the electrician is already on site
- Understand NEM 3.0 net metering: California switched from NEM 2.0 to NEM 3.0 (Netting Billing Metering) in April 2023. Export credits under NEM 3.0 are about 75% lower than NEM 2.0. This means the payback period is longer under NEM 3.0 — typical San Jose payback is now 7-10 years (vs 5-7 years under NEM 2.0). Adding battery storage (Tesla Powerwall, Enphase IQ Battery) is more valuable under NEM 3.0 because you store daytime generation for nighttime use instead of exporting at low rates
- Pull permits concurrently: San Jose allows solar permits and building permits to be submitted together. A combined permit review may be faster than two separate submissions. Your general contractor and solar installer should coordinate on permit submission
- Schedule PG&E interconnection early: Submit the PG&E interconnection application as soon as the permit is issued. PG&E interconnection approval often takes 30-90 days — this is the step that delays when the system goes live, not the installation itself
| San Jose Solar System Cost 2025 | Details |
|---|---|
| System size (typical home) | 6-10 kW for a 2,000-3,000 sq ft home |
| Number of panels | 16-28 panels (400-watt panels) |
| Installed cost before incentives | $18,000 – $30,000 |
| Federal Solar Tax Credit (ITC) | 30% of cost = $5,400 – $9,000 off federal taxes |
| Net cost after ITC | $12,600 – $21,000 |
| Payback period (NEM 3.0) | 7-10 years |
| Battery storage (optional) | $10,000 – $16,000 per battery (Tesla Powerwall) |
Quartz Construction coordinates roof replacement and home renovation work with solar installations throughout San Jose — we work alongside your solar installer. Learn about home renovation services. CSLB #1003436 | Call (650) 749-7436.
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