Should You Convert Your Berkeley ADU to a Condo or Keep It as a Rental? A 2026 Decision Guide
ADU Pilot Team
ADU Pilot Team
Bottom Line
Berkeley homeowners with a backyard ADU now have a genuine choice: sell it as an independent condo under AB 1033, or hold it as a rental. Three factors determine which makes more sense.
- Your mortgage: If your outstanding loan balance exceeds 60% of your property's post-split value, your lienholder can veto the conversion before any other question matters.
- Your tenant situation: Most Berkeley backyard ADU tenants do not have a statutory first right to purchase under the final ordinance — that protection applies only to tenants in multi-unit buildings with full rent stabilization coverage. But just-cause eviction rules apply to every tenant, regardless of unit type.
- Your math: At current Berkeley rental rates ($2,400/month for a 1-bedroom), keeping a well-maintained ADU as a rental is competitive with a condo sale unless the sale price clears roughly $540,000.
What Berkeley's AB 1033 Ordinance Actually Says
On January 20, 2026, Berkeley's City Council voted 6-1 to adopt Berkeley Municipal Code Chapter 21.29, establishing the city's framework for separate ADU condominium sales under AB 1033. [1] The deliberations mattered as much as the final vote.
Council Member Lunaparra, the sole dissenting vote, proposed an amendment that would have extended first-right-of-refusal protections to all ADU tenants and restricted conversions to units built after 2002. The Council rejected her amendment 4-3. [1]
This is worth knowing precisely because news coverage of the deliberations left some homeowners with a distorted picture of what the law requires.
The "post-2002 construction" restriction is not in the final ordinance. That language appeared in the Lunaparra amendment, not in the adopted text. Berkeley Municipal Code § 21.29.040 requires only that the ADU was built in compliance with BMC Chapter 23.306 (Berkeley's ADU zoning chapter, first adopted in 2003) or its predecessor. There is no calendar-year cutoff. [1]
There is no all-electric construction requirement for AB 1033 conversions. Berkeley's natural gas prohibition (BMC Chapter 12.80), passed in 2019, was struck down by the Ninth Circuit in 2023 and repealed by the City Council in May 2024. [2] References to an "all-electric mandate" for Berkeley ADU condo conversions describe a requirement that no longer exists.
For the complete state-level legal framework governing how AB 1033 conversions work, see our AB 1033 comprehensive guide.
Step 1: Does Your ADU Qualify?
Before weighing the tenant situation or the financial comparison, your property must clear three eligibility gates:
Permit compliance: The ADU must have been built with permits, in compliance with BMC Chapter 23.306 or its predecessor (BMC Chapter 23C.24). An unpermitted conversion — a garage turned into a studio without permits, for example — does not qualify until a certificate of compliance is obtained.
Existing HOA authorization: If your property already sits within a planned development with a homeowners association, BMC § 21.29.040(G) requires the HOA board (and, if the governing documents demand it, the membership) to give express written authorization before you can record a condominium plan. [1] HOA communities have an additional approval layer that properties without an HOA do not face.
Lienholder consent: California Government Code § 65852.26 requires written consent from every lienholder before a condo subdivision map can be recorded. [3] For homeowners carrying a Fannie Mae-backed mortgage with a loan balance above 60% of the post-split property value, this consent is structurally blocked under Fannie Mae's servicing guidelines — not merely unlikely, but unavailable under current GSE policy. The full mechanics are covered in our AB 1033 lending guide.
Step 2: The Tenant Question — Who Has a First Right to Buy?
Berkeley's final ordinance grants an exclusive right to purchase only to tenants in "Covered Rental ADUs" — units in multi-unit buildings where rent is subject to Berkeley's Rent Stabilization Ordinance from the moment the initial tenancy is established. [1]
For a typical Berkeley homeowner whose property is a single-family home with one backyard ADU — and who lives on the property — the ADU is most likely classified as a partially exempt or fully exempt unit under the rent stabilization ordinance. Measure Q, passed by Berkeley voters in November 2018 with 71% approval, exempts ADU tenancies beginning after November 6, 2018, on owner-occupied single-family properties from rent ceilings. [4] Measure MM (2020) refined that exemption to require owner occupancy.
The result: if your ADU falls into this exempt category, your tenant has no statutory first right to purchase under the final AB 1033 ordinance. That protection was part of the Lunaparra amendment that failed.
Classification and Protections at a Glance
| ADU type | Rent ceiling applies? | First right to purchase? | Just-cause eviction? |
|---|---|---|---|
| Multi-unit building, full rent stabilization coverage | Yes | Yes — exclusive purchase window at market price [1] | Yes |
| SFH + 1 ADU, owner-occupied, tenancy after Nov. 6, 2018 | No (Measure Q) | No | Yes |
| SFH + 1 ADU, tenancy established before Nov. 6, 2018 | Case-specific | Case-specific | Yes |
One protection is universal: Berkeley Municipal Code § 13.76.130 requires just cause for every eviction, in every rental unit in the city. [5] You cannot end a tenancy solely to proceed with an AB 1033 conversion, regardless of whether the ADU is covered or exempt.
For exempt ADU tenants, this means you must wait for a lawful end to the tenancy — non-payment, a material lease violation, owner or qualifying family-member move-in, or the tenant's voluntary departure — before you can present a vacant unit to buyers.
For covered ADU tenants, the timeline is longer: the tenant has an exclusive right to purchase at market price for the period specified in BMC 21.28.090(C)(2). If they decline or cannot arrange financing in that window, you may proceed with an outside buyer.
Step 3: The Financial Comparison
The decision is a trade-off between a lump-sum sale and a long-run income stream. Neither option dominates in all cases.
What Berkeley Small Condos Sell For
Recent closed transaction data specifically for AB 1033 ADU condos in Berkeley does not yet exist — the ordinance is too new and no conversions have completed as of this writing. As a reference point, small condos (under 800 sqft) listed in Berkeley in early 2026 showed asking prices of roughly $518,000–$695,000 for units ranging from 768 to 925 square feet, implying per-square-foot figures of $674–$800. [6] An ADU-sized condo in the 500–650 sqft range would plausibly list in the $400,000–$550,000 range. These are asking prices, not verified closed sales, and an ADU condo may price below a comparable traditional condo given the novelty of the product and the shared-wall dynamic with the primary residence.
What Berkeley ADU Rentals Generate
A 1-bedroom Berkeley ADU currently rents for approximately $2,250–$2,670 per month, based on current market data for the East Bay. [7][8] Using $2,400/month as a working midpoint, annual gross income is $28,800.
Deduct Berkeley Rent Board registration fees ($397/year for FY2026-27 for fully covered units, $244/year for partially covered units [9]), landlord insurance, and routine maintenance — conservatively $3,500–$5,000/year — and net income runs approximately $23,800–$25,300/year.
The Break-Even Math
If you sell the ADU for $475,000 and invest the proceeds conservatively at 4.5% (a rough proxy for a diversified bond portfolio or money market as of mid-2026), the annual return is approximately $21,375 — below the net rental income in most scenarios. At a $550,000 sale price, the invested return at 4.5% reaches $24,750, approaching the midpoint of the rental income range.
The break-even sale price, at a 4.5% reinvestment rate and $24,500 average net rental income, is roughly $540,000.
This analysis does not capture:
- Property appreciation: Berkeley's appreciation history favors holding if you expect the underlying property to grow in value.
- Tax treatment: Rental income is taxed as ordinary income; sale proceeds may trigger capital gains. A CPA should model your specific situation.
- Management burden: Vacancy risk, maintenance calls, and Rent Board compliance carry real time and cost.
- Transaction costs: Conversion requires a condominium plan, subdivision map, county recording fees, and legal work. Expect $15,000–$25,000 in upfront costs before the ADU can be listed. [10] These must be recovered before a sale outperforms the status quo.
- Buyer's property tax: When the ADU is sold, the buyer's portion is reassessed at current market value under California's change-of-ownership rules. Your own primary home is not reassessed. This does not affect your decision directly, but it affects what buyers budget for their all-in carrying cost.
The Decision Framework
Work through these questions in order. Stop when you have a clear answer.
1. Does your ADU meet the eligibility requirements? If it lacks permits or sits in an HOA without authorization, resolve eligibility first. No other question is relevant until this is settled.
2. Do you carry a mortgage with an LTV above 60% of post-split value? If yes, the lienholder consent requirement is a structural blocker under current GSE policy. The conversion is not executable without a refinance or a significant principal paydown.
3. Is the ADU currently occupied? If no, skip to question 5 below. If yes, continue.
4. What type of tenancy is it?
- Multi-unit building with full rent stabilization: your tenant has an exclusive right to purchase at market price for a defined window per BMC 21.28.090(C)(2). Build that timeline into your planning.
- Owner-occupied SFH with a post-November 2018 tenancy: no statutory first right to purchase, but just-cause eviction still applies. You cannot remove the tenant to enable a sale.
5. Run the sale vs. hold comparison for your specific numbers.
| Sell if | Hold if |
|---|---|
| Realistic sale price is above $540,000 | Realistic sale price is below $500,000 |
| You need the capital for another purpose | ADU generates reliable rental income with low vacancy |
| Management burden outweighs the income | You are in the accumulation phase and prefer asset appreciation |
| ADU is older with significant maintenance needs | ADU is new or recently renovated, low-maintenance |
| Capital gains tax impact is manageable | A sale would trigger a large taxable gain |
What the HOA Means for Your Buyer Pool
Every California condominium — including a two-unit house-plus-ADU project — must comply with the Davis-Stirling Common Interest Development Act, which mandates establishing a homeowners association. [11] In a two-unit conversion, you and the ADU buyer are the only two members.
Realistic HOA costs for a two-unit California condo run $130–$355 per month, covering master property insurance, liability insurance, reserve contributions, and basic administration. Under Fannie Mae underwriting guidelines, each $100 in monthly HOA dues reduces a buyer's maximum loan capacity by roughly $15,000 at current interest rates. At $250/month — a plausible midpoint for Berkeley's insurance environment — your buyer loses approximately $37,500 in purchasing power.
This is a factor in pricing, not a barrier to conversion. A buyer with sufficient income to absorb the HOA payment within their debt-to-income limits is a well-qualified buyer. Price the ADU at a level where the HOA-adjusted carrying cost is competitive with Berkeley rents, and the buyer pool is real. Price it above that level, and the unit may sit.
The detailed mechanics of Fannie Mae's two-unit condo underwriting and the lienholder consent process are covered in our AB 1033 lending guide.
References
[1] Berkeley City Council Revised Agenda Packet, January 20, 2026. Ordinance adopting BMC Chapter 21.29 — separate ADU sales framework. https://berkeleyca.gov/sites/default/files/city-council-meetings/2026-01-20%20Revised%20Agenda%20Packet%20-%20Council%20-%20WEB.pdf
[2] Berkeley City Council, Report on Repeal of BMC Chapter 12.80, May 14, 2024. https://berkeleyca.gov/sites/default/files/documents/2024-05-14%20Item%2002%20Repeal%20of%20Berkeley%20Municipal%20Code%20Chapter%2020.80.pdf (Note: The city's PDF filename references "Chapter 20.80"; the ordinance as enacted and referenced in council documents is BMC Chapter 12.80.)
[3] California Government Code § 65852.26 (AB 1033 condominium conversion statute). https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=65852.26.&lawCode=GOV
[4] Measure Q (November 6, 2018), City of Berkeley — Rent Ordinance ADU Exemption. Alameda County Registrar of Voters. https://acvote.alamedacountyca.gov/acvote-assets/02_election_information/PDFs/20181106/en/Measures/13%20-%20Measure%20Q%20-%20City%20of%20Berkeley.pdf
[5] Berkeley Municipal Code § 13.76.130, Just Cause Required for Eviction. https://berkeley.municipal.codes/BMC/13.76.130
[6] East Bay Condo Mania, Berkeley new listings April 3–9, 2026. Asking prices only; no recent closed AB 1033 ADU condo sales available. https://eastbaycondomania.com/city/BERKELEY.php
[7] Zumper, Berkeley Rent Research, April 2026. https://www.zumper.com/rent-research/berkeley-ca
[8] Matthews Real Estate Investment Services, Berkeley Multifamily Market Report, Q2 2024. https://matthews.com/market_insights/multifamily-market-report-berkeley-california
[9] Berkeley Rent Stabilization Board, Registration Fees Fiscal Year 2026-2027. https://rentboard.berkeleyca.gov/elected-rent-board/news/registration-fees-fiscal-year-fy-2026-2027
[10] Industry estimate based on standard California condominium conversion costs (attorney fees, survey, county recording, title work). No Berkeley-specific primary source available as of May 2026.
[11] California Civil Code § 4000 et seq., Davis-Stirling Common Interest Development Act. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=4000.&lawCode=CIV
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