Berkeley Never Fixed Its Condo Shortage. It Built a Detour Around It.

"We're trying to create more housing inventory that's available for less than $1 million," Berkeley Councilmember Brent Blackaby said the night the city council voted to let homeowners sell their backyard cottages as condos. He added the hope that it would land "substantially less" than that. It sounds like a modest tweak to accessory dwelling unit rules. It is actually an admission that a 2009 city ordinance capping how many units can convert to condominiums each year was never going to loosen on its own, and that the council decided to build around it instead of waiting.

Here is the puzzle a Berkeley buyer runs into almost immediately. Single-family homes here closed at a median of roughly $1.4 million to $1.5 million through 2026, and they move fast, typically under contract within about two weeks. Condos should be the release valve. In a city this expensive, cheaper attached homes are usually where first-time buyers land. Instead, condo prices in Berkeley actually fell by roughly 21 percent year over year in the first quarter of 2026, landing at a median around $625,000, even as single-family prices held close to flat. A falling price with almost no accompanying inventory is not a bargain. It is a symptom.

The cap nobody talks about

The reason traces back to an ordinance most Berkeley buyers have never heard of. Since 2009, the city's condominium conversion rules have capped the number of rental units that can be approved for conversion to condominiums at 100 per year, with any unused capacity rolling forward but never exceeding 200 units in a single year. That ordinance exists to protect renters from being pushed out by a wave of conversions, and it has done exactly that. It has also meant that Berkeley's condo stock has grown at a trickle for nearly two decades while the region's population, incomes, and housing demand did not stand still.

You can see the effect in the price gap itself. A condo market with genuinely healthy supply doesn't sit 55 percent below the single-family median while simultaneously getting cheaper. What you're looking at is a market where almost nothing new enters, existing units rarely turn over, and the properties that do sell increasingly skew toward older, smaller, or less desirable stock. Berkeley didn't build its way past this constraint. It legislated the constraint into place and left it there.

The side door: BMC 21.29

On January 21, 2026, the city council voted 6-1 to open a different path entirely. The new ordinance, Berkeley Municipal Code Chapter 21.29, implements a 2024 state law, AB 1033, that lets cities allow homeowners to sell a legally permitted accessory dwelling unit separately from the main house, structured as a condominium. Berkeley chose to opt in. Councilmember Cecilia Lunaparra cast the lone no vote, after her broader amendments to add tenant protections and impose the standard mitigation fee on ADU conversions failed to gather enough support.

What makes this a genuine detour rather than a variation on the old process is what it skips. An ADU condo conversion under 21.29 does not count against the 100-unit cap in Chapter 21.28. It does not require the public hearing or appeals process that a standard condo conversion involves. And it waives the Affordable Housing Mitigation Fee that the city normally charges when a rental unit converts to ownership housing, the same fee that has made conventional conversions slow and expensive for decades. A property can host up to ten ADU condo units under the ordinance, reviewed through a ministerial map process rather than discretionary approval.

Berkeley has issued roughly 100 ADU building permits a year on average since 2018. That stock of backyard cottages, garage conversions, and basement units is the raw material this ordinance is trying to turn into a new category of starter home, without touching the 2009 cap that has kept the rest of the condo market frozen.

What actually has to be true before a sale happens

This is where the ordinance gets less tidy, and where a buyer or seller needs to slow down before assuming a specific ADU qualifies.

The unit has to already be legally permitted and meet current building and safety standards. An unpermitted garage conversion, however livable it looks, does not clear this bar without going through the standard permitting process first, which is its own timeline and cost. If the ADU is a covered rental unit under Berkeley's Rent Stabilization Ordinance, the tenant living there gets a three-month window to make the first offer before the unit can go to the open market. That window applies specifically to older, rent-controlled units rather than every occupied ADU in the city, but it is a real delay that a seller working toward a specific closing date needs to plan around.

The property also has to go through the condominium creation process under California's Davis-Stirling Act, which means a recorded map, lienholder consent if there's a mortgage on the property, and the legal machinery of establishing a common interest development, even for a two-unit lot. None of that is unique to Berkeley, but it is a meaningfully different process than listing a single-family home, and it is not something a seller can shortcut by simply pointing to the new ordinance.

Location matters too. A lot inside Berkeley's Hillside Overlay, which roughly tracks the higher-fire-risk zones in the hills, faces smaller size limits on any ADU built there and additional fire-safety requirements on new construction. That doesn't disqualify a hillside ADU from the condo pathway, but it does mean the unit being sold is more constrained in size than a comparable ADU in the flats.

What this means if you're searching right now

For a buyer who has been watching Berkeley's single-family median sit near $1.5 million and hoping a condo search would be more forgiving, this ordinance is worth tracking closely over the next year, not as a guarantee of inventory today, but as the first real crack in a supply constraint that has held since before most current Berkeley homeowners bought their houses. The units that come to market this way will be small, they will be scattered one or two at a time across existing residential lots rather than delivered in a single new building, and many of them will carry the particular quirks of whatever structure they started as, a garage, a converted basement, a cottage built for a family member.

For a homeowner who already has a legal ADU on the property, the more immediate change is optionality. An ADU that used to function only as rental income or extra family space now has a separate exit strategy, provided it clears the permitting, tenancy, and Davis-Stirling requirements above. That is a meaningfully different asset than it was a year ago.

None of this changes the pace of the broader Berkeley market. Homes here have continued to close in around two weeks with multiple offers well above asking through the summer of 2026. The ADU condo ordinance is not going to soften that competition for single-family buyers. What it does is create a category of ownership that functionally did not exist in this city twelve months ago, and give both sellers and buyers a new set of questions to ask before assuming a listing works the way it looks on paper.

A few questions Berkeley buyers and sellers are asking

Can I sell my ADU as a condo right now? Only if it is already legally permitted and meets current building and safety code. An informal or unpermitted unit needs to go through standard permitting first, which is a separate and often lengthy process.

Does the three-month tenant right of first refusal apply to every occupied ADU? No. It specifically applies to ADUs covered by Berkeley's Rent Stabilization Ordinance. Confirm a unit's rent-control status before assuming a timeline.

Does this affect homes in the Berkeley Hills differently? Yes. Properties inside the Hillside Overlay face smaller ADU size caps and additional fire-safety construction requirements, which shapes what can be built and sold there even under the new ordinance.

Will this bring down single-family prices? There's no evidence it will. It creates a new small-ownership category alongside the existing single-family and traditional condo markets, not a substitute for either.

If you're trying to figure out where a specific ADU, lot, or Berkeley listing actually falls in all of this, that's exactly the kind of local detail worth a real conversation rather than a guess. Caitlin Crawford works these Berkeley micro-markets daily and can walk you through what a property's permit history, zoning overlay, and rent-control status mean for your specific plans. Request a personalized consultation to start that conversation.