Berkeley homeowners tend to arrive with more of this already worked out than anywhere else I work. Two things still catch people: the hills' shade, and BESO.
If you might sell in the next few years, read the BESO section first. Berkeley's time-of-sale energy rules changed at the start of 2026, and they interact with any electrification plan you're making.
Berkeley's Building Emissions Saving Ordinance requires an energy assessment and a Home Energy Score before listing a single-family home or duplex — a requirement that took effect on January 1, 2026. Sellers can complete upgrades before the sale or defer them, with the buyer then carrying a window to finish the work.
This isn't a solar mandate, and solar isn't automatically the cheapest way to satisfy anything in it. But it changes the sequencing question. If you're weighing solar, a heat pump, a panel upgrade, and a sale in the same few years, the order you do them in matters, and doing them as one coordinated project is usually cheaper than three reactive ones.
The rules and thresholds are the City's and they do get updated — confirm the current requirements with Berkeley's Office of Energy and Sustainable Development, or ask me and I'll tell you what I'm seeing on current projects. I'm a solar consultant, not your assessor.
Same split as Oakland, sharper. Below campus you get flatter lots, simpler roofs, and decent unobstructed sun. Above it — the north Berkeley hills, Claremont, Cragmont — you get larger homes, steeper sites, heavy tree cover, and afternoon terrain shading that a satellite-based sales tool will miss entirely.
For a hills house I want a real shade study before I'll put a production number in writing. An array that looks excellent in June can badly underperform in December when the sun is low and the ridge is in the way.
Much of the Berkeley hills also sits in a high fire-threat district, which makes PSPS outages a live consideration and can open the meaningful tiers of the state battery rebate. That's covered in do I need a battery.
A lot of Berkeley's stock predates the war, and brown-shingle and Craftsman houses often carry electrical service that hasn't kept up. Undersized panels and the occasional Federal Pacific are common enough that I check first. Details in the panel guide.
Berkeley is PG&E territory, so NEM 3 applies and the usual conclusion holds: storage is usually what makes the project work, and the size of your evening load is what decides it. What changed in 2026 — and it's the part most articles still get wrong — is in the NEM 3 guide.
Berkeley homeowners generally ask good, skeptical questions, which I appreciate. Bring twelve months of usage data and we can get to a real answer in one visit.
A free 45-minute visit, a look at your bill and your roof, and a straight answer about whether solar makes sense for your home.
Or call or text (510) 926-8332