A seller in north Berkeley sits down with her agent to talk about listing timeline and finds out, partway through the conversation, that closing now involves a number she hadn't budgeted for: $2,500, held by the city, for an energy upgrade she hasn't made yet. It isn't a fee she can negotiate away. It isn't a repair credit she can offer instead. It's a deposit, and as of January 1, 2026, it's part of how a growing share of Berkeley home sales actually close.
That deposit is the clearest sign of what changed when Berkeley overhauled its Building Emissions Saving Ordinance this year. The city didn't just ask sellers to disclose more. It rebuilt the ordinance so that a piece of real money moves at closing whether or not the work gets done first. For sellers and buyers of single-family homes and duplexes, that shift changes what a net sheet looks like and what gets negotiated in escrow.
The Rule That Replaced a Rule Nobody Followed
The old version of BESO, in place for years before this update, asked sellers to get an energy assessment at time of sale. That was the whole requirement. No upgrade, no deposit, no enforcement beyond the paperwork itself. The result was predictable: almost nobody acted on the recommendations voluntarily. The assessment became a form that got filed and forgotten, not a lever that changed how homes got prepared for market.
Berkeley's City Council passed the expanded ordinance in April 2024, with the new rules taking effect at the start of this year. The redesign is built around a simple observation: disclosure alone doesn't change behavior, but money at the closing table does. Under the current version, sellers of one and two unit residential properties have to get a Home Energy Score before listing, post that score in the MLS listing itself, and then choose a real path to compliance rather than a form to file.
Two Paths, One Choice at Listing
Every seller of a single-family home or duplex in Berkeley now works through the same fork in the road before the sign goes up.
Path one is to complete the upgrade before listing. A qualifying heat pump water heater or heat pump HVAC system each earns the full six "emissions resiliency credits" the city requires, and either one clears the bar on its own. The energy assessment itself runs $200 to $600 per unit depending on the assessor and square footage, the heat pump installation typically runs $1,500 to $4,000 before rebates, and the seller pays a $150 filing fee to receive a formal Certificate of Compliance. A seller who does this can market the home as already compliant, which removes the issue from buyer conversations entirely.
Path two is to defer the upgrade to the buyer. This is where the deposit comes in. Seller and buyer each put $2,500 into a $5,000 deposit held by the City of Berkeley. The buyer then has two years from the sale date to complete a qualifying upgrade, with a one-year extension available through the BESO portal if needed. Once the work is documented, the city refunds the full $5,000 to the buyer.
| Path 1: Upgrade before listing | Path 2: Defer to buyer | |
|---|---|---|
| Who pays upfront | Seller covers assessment and upgrade | Seller and buyer split $5,000 deposit |
| Approximate cost | $200-600 assessment, $1,500-4,000 heat pump, $150 filing fee | $2,500 seller share, refunded to buyer later |
| Timeline | Completed before listing | Up to 2 years after closing, extension available |
| Marketing effect | Home lists as already compliant | Compliance becomes a post-closing task for the buyer |
| Non-compliance fee | $500 if score isn't obtained before listing | Same $500 fee applies if deferral isn't properly filed |
Skipping the process altogether, in either direction, triggers a flat $500 non-compliance fee. That's a small number next to the deposit, which is exactly why it functions as a backstop rather than a real deterrent. The deposit is the mechanism doing the actual work.
Why Most Berkeley Homes Start Outside the Exemption
There is one clean way out of all of this: if a home already runs entirely on an electric heat pump for both water and space heating, it may qualify for a full exemption from the upgrade requirement, though the Home Energy Score assessment is still required. According to the city's own overview of the amended ordinance, somewhere between 5 and 7 percent of Berkeley homes currently qualify for that exemption.
Read the other way, that means 93 to 95 percent of the city's housing stock starts this process without an exemption. Berkeley's residential blocks are dominated by homes built well before electric heat pump technology existed as a standard option, the Craftsman bungalows, brown shingles, and early twentieth century construction the city is known for. Those are exactly the homes most likely to still run on gas water heaters and furnaces, and exactly the homes that will need to pick a path at the moment of listing rather than skip the question.
This is the part of the ordinance that doesn't show up in a quick summary of the rule. It isn't evenly distributed friction. It concentrates on the older, character-driven housing that makes up the bulk of what actually trades hands in Berkeley in a given year.
A Deposit Rule Change Arriving September 30
The deposit system created a scenario the original 2026 rules didn't fully address: what happens when a buyer who deferred their upgrade turns around and sells the home again before the two-year compliance window closes. Does the new buyer inherit the deposit? Does the original buyer forfeit their $2,500?
The city has already answered that question. A new version of the BESO Administrative Regulations, effective September 30, 2026, updates exactly this scenario, clarifying how Resilience Upgrade deposits carry forward when a covered property resells before the upgrade work is finished. For anyone currently in escrow on a Berkeley property that deferred its BESO compliance at a prior sale, this is worth confirming with the title company before closing, since the rules governing that deposit are changing within the same month many fall transactions are scheduled to close.
The 2027 Deadline That Makes Early Action Pay Twice
Sellers weighing whether to do the upgrade now or defer it have one more date worth knowing. Starting in 2027, the Bay Area Air Quality Management District's rules take effect prohibiting the sale and installation of gas-powered water heaters that emit nitrogen oxide, with the same restriction extending to furnaces in 2029. A seller who installs an electric heat pump water heater now to satisfy BESO isn't just clearing a local requirement. They're getting ahead of a regional phase-out that will eventually make the gas replacement option unavailable anyway. For a seller choosing between path one and path two, that timing tilts the math toward doing the work before listing rather than pushing it onto a buyer who will face the same regional deadline regardless.
A Few Questions We Hear From Sellers
Does this apply if I'm selling a condo? No. The ordinance's time-of-sale requirements apply to single-family homes and duplexes. Condominiums and accessory dwelling units are excluded.
What if I own a triplex or fourplex? Those buildings are on a slower phase-in. They're required to complete an energy assessment before listing now, but the full upgrade requirement doesn't apply to them until January 2028.
Can my agent handle the Home Energy Score paperwork for me? A real estate agent may complete the BESO energy assessment requirement on behalf of the seller, though the assessment itself still has to be done by a registered assessor from the city's list.
How long is a Home Energy Score good for? Five years. If a home sold recently and already has a current score on file, that report can often be reused for a subsequent sale within the window rather than commissioning a new one.
Berkeley's housing stock has always rewarded sellers who prepare early rather than react at the last minute, and this ordinance is no exception. Knowing which path fits a specific property, and when the newest deposit rules take effect, is exactly the kind of groundwork that keeps a listing timeline on track instead of stalling it in escrow.
If you're weighing a Berkeley sale in the months ahead and want to know where your property lands on this new set of rules, Teri Carlisle & Alexandra Dierkx can walk through the specifics with you. Request a complimentary home valuation and we'll help you map out what preparation actually looks like before your home goes on the market.
