Will Your San Francisco ADU Be Rent Controlled? It Depends on the Programme You Choose
In San Francisco, rent control is not decided by the ADU itself. It is decided by the programme you file under, whether your building already has a unit under the Rent Ordinance, and whether you asked for a waiver. Get that choice wrong and you cannot quietly undo it later.
The short answer
A new ADU falls under the SF Rent Ordinance if any one of three triggers applies
- (a) It was built under the Local Program — Planning Code §207.1.
- (b) It is added to a building that already has a unit under the Rent Ordinance.
- (c) The owner requested a waiver.
Where a trigger applies, the unit is registered under a recorded Costa-Hawkins Agreement. A unit built under the State Program (§207.2), in a building with no existing Rent Ordinance unit, and with no waiver requested, sits outside the Ordinance on this test. The San Francisco Rent Board is the confirming authority for a specific building.
Sources: San Francisco Local Program rules, sf.gov, and the SF Rent Ordinance framework (Admin Code Ch. 37), checked Nov 2026. Housing-services risk summarised from law-firm analysis of the Rent Ordinance — see that section for the attribution and the instruction to confirm with the Rent Board or counsel. This page is guidance, not legal advice.
The decision
State (§207.2) vs Local (§207.1): what you gain, what it costs
The two programmes are not just two permit routes. They are two different rental futures for the same physical unit.
| Route | What you gain | What it costs | Rent outcome for the new ADU |
|---|---|---|---|
| State Program — §207.2 | The state-mandated route, without asking Planning for local waivers. | Less local flexibility on some planning standards. | Outside the Rent Ordinance unless trigger (b) or (c) applies — an existing Ordinance unit in the building, or a waiver you requested. |
| Local Program — §207.1 | Access to planning waivers — flexibility on some standards where the Local Program allows them. | Rent Ordinance coverage, with registration under a recorded Costa-Hawkins Agreement. | Under the Rent Ordinance by trigger (a). |
| Either route + a waiver request | Whatever specific waiver Planning can grant for your design. | The waiver itself triggers Ordinance coverage. | Under the Rent Ordinance by trigger (c), and registered under a Costa-Hawkins Agreement. |
Some waivers are never available on any route. Planning waivers are never available for ceiling height, ventilation, fire safety, or exits. If your design only works by waiving one of those four, it does not work — re-scope the design rather than planning around a waiver that cannot be granted.
That is the real trade: the Local Program can offer flexibility on some standards, and the price of the local route — and of any waiver — is Rent Ordinance coverage plus the recorded agreement. Price that trade before you file, not after the unit is built.
Trigger (b) in plain language
If your building already has a Rent-Ordinance unit
The Rent Ordinance generally covers most units in buildings built before June 13, 1979. That date is only the general frame — it does not decide your building on its own. What matters for an ADU is the second trigger: if you add an ADU to a building that already has a unit under the Ordinance, the new ADU falls under the Ordinance too, whichever programme you chose.
This is why two identical ground-floor conversions on the same street can have different rent outcomes. One is in a newer building with no Ordinance unit. The other is added to a pre-1979 Victorian or Edwardian building where an existing flat is already covered. The construction looks the same. The rental rules do not.
Do not guess from the building's age or appearance. Confirm the specific building's status with the Rent Board before you choose a programme — because if trigger (b) already applies, the State route does not keep the new unit outside the Ordinance, and the decision table above reads differently for you.
The risk nobody warns you about
Housing services: the garage, laundry and storage your tenants already use
Many San Francisco ADUs are carved out of space tenants already use: a garage, parking, laundry, storage, a deck or a garden. Under the Rent Ordinance, those are housing services — part of what a tenant receives with their home, not empty space waiting for a better use.
Legal-risk summary — confirm with the Rent Board or counsel before you act. Law-firm analysis of the Rent Ordinance warns that removing or reducing a tenant housing service — garage, parking, laundry, storage, deck, garden and similar services — without just cause can expose the owner to treble damages, emotional-distress damages and attorney's fees. Building an ADU is not, by itself, just cause.
Read that carefully. It does not say you can never convert a garage. It says the conversion does not automatically authorise taking a housing service away, and the exposure for getting it wrong is severe. The check belongs at the start of the project, alongside ceiling height and egress — not when a tenant objects after work has begun.
- List every service the lower level currently provides, tenant by tenant: parking, storage cages, laundry access, bike space, deck or garden use.
- Ask how each service is replaced, reduced or retained in the ADU design — and get that answer reviewed before filing.
- If any service disappears, treat the rent-control page's warning as a stop sign until the Rent Board or your counsel has confirmed the position.
This check is built into our San Francisco checker for a reason. The basement and lower-level conversion guide and the Sunset District guide both link back here because the services question decides whether their conversions are safe to pursue at all.
Process
The Notice of Addition and the tenant contest
When an ADU is added to a rent-controlled building, a Notice of Addition process applies. Tenants have a contest window — an opportunity to contest the addition through that process.
Build that into your timeline and your tenant communications from the start. A homeowner who treats the notice as paperwork after the fact creates exactly the dispute the process is designed to surface early. Confirm the current notice requirements and the contest procedure for your building with the Rent Board when you confirm the building's status, so the filing you make matches the building you actually own.
Timing
How programme choice is made — and when it is too late to change
Programme choice is decided when you file. The choice is effectively locked once the permit route is set: changing course after filing means re-filing. That is why the decision table at the top of this page matters before drawings are finalised — a design drawn around Local Program waivers cannot be casually re-badged as a State Program filing, and a filing made to obtain a waiver carries the rent consequence with it.
Sequence it in this order: (1) confirm whether your building already has a Rent Ordinance unit; (2) run the housing-services check; (3) only then choose State or Local, with the rent outcome written down. If step 1 already triggers coverage, steps 2 and 3 are about managing a known outcome, not avoiding a surprise one.
Confirm, do not assume
Confirm your building with the Rent Board
This page gives you the decision framework. Only the San Francisco Rent Board confirms a specific building's status. Before you file, confirm: whether any existing unit is under the Ordinance, how the Notice of Addition applies to your building, and how any affected housing services must be handled. For anything contested or high-value, take independent legal advice as well — the housing-services exposure described above is exactly the kind of risk that should be confirmed for your facts, not read off a guide.
Our checker asks the two screening questions that start this work for San Francisco properties: was the building built before June 13, 1979, and does the space you want to convert currently provide tenant services (garage, parking, laundry, storage or similar)? Your answers shape the plan you receive — they do not replace Rent Board confirmation.
Questions, answered
Rent control and your ADU
Will my new ADU be rent controlled — yes or no?
It depends on the three triggers: built under the Local Program (§207.1), added to a building that already has a Rent Ordinance unit, or built with a waiver you requested. Any one trigger brings the new unit under the Ordinance, registered under a recorded Costa-Hawkins Agreement. The Rent Board confirms for a specific building.
What do I gain and give up with the Local Program?
You gain access to planning waivers — flexibility on some standards. You give up the State route's position outside the Ordinance: a Local Program ADU is under the Rent Ordinance by trigger (a). Waivers are never available for ceiling height, ventilation, fire safety or exits on any route.
My building already has a rent-controlled unit. Does programme choice still matter?
Less than you might hope. Under trigger (b), an ADU added to a building with an existing Rent Ordinance unit falls under the Ordinance itself. Programme choice still affects your planning route, but it does not keep the new unit outside the Ordinance in that situation.
Can I take the tenants' garage or laundry for the ADU?
Not on the assumption that building an ADU is itself just cause — law-firm analysis of the Ordinance says it is not, and removing or reducing a housing service without just cause can expose an owner to treble damages, emotional-distress damages and attorney's fees. This is a legal-risk summary, not a damages promise: confirm your exact position with the Rent Board or counsel first.
What is a Costa-Hawkins Agreement?
On the sf.gov Local Program rules, units that fall under the Rent Ordinance through these triggers are registered under a recorded Costa-Hawkins Agreement. Treat it as part of the price of the Local route or a waiver: a recorded commitment, not an informal understanding.
When is it too late to change programme?
Programme choice is decided when you file, and is effectively locked once the permit route is set. Changing course after filing means re-filing — so make the State vs Local decision, with its rent consequence, before you file.
San Francisco guides
The rest of the SF cluster
Two detached ADUs from 2027
What AB 956 changes on Jan 1, 2027 — and which SF lots can honestly fit two detached units.
San FranciscoSell an ADU separately — AB 1033
The exact eligibility test for converting an SF ADU to a separately saleable condo.
San FranciscoBasement & lower-level conversion
Ceilings, egress, structure and the mandatory housing-services check for ground-floor conversions.
San Francisco · District 4ADUs in the Sunset District
What District 4 permit data actually shows for 25-foot Sunset lots.
Check your property
Start with the two screening questions
The checker is pre-set to San Francisco. It asks whether your building predates June 13, 1979 and whether the space you want to convert provides tenant services — then builds your plan around the answers, with Rent Board confirmation flagged where your building needs it.
Check my lot
FREE · FAST VERDICTStep 1 of 2 — your address and one tap on what you want to build. That is enough for a first verdict; sharpen it afterwards only if you want to.
Every type, answered — not just the one you picked
True cost — the planning band, the fees on record, and what the band leaves out
Not in the band — budget these separately; no honest source lets us put a number on them for your lot, so none is invented:
How long until someone can move in?
Dates that change this decision
What the permit record shows
What would change this answer
Lay your quotes side by side
Print this sheet and write each contractor's figures in a column. Every row is something a comparable bid has to state; a blank in a quote is a question for that contractor, not a saving. The first column is your brief, filled from your answers.
| Line every quote must state | Your brief | Quote A | Quote B | Quote C |
|---|
Check each contractor's licence number on the Contractors State License Board's public lookup (cslb.ca.gov) before you compare prices. Figures in your brief are the rule caps and planning estimates shown above, not bids.
Make your verdict more exact (optional)
Skip these — save my brief now ↓San Francisco screening — two questions that decide an SF project
In San Francisco, space a tenant uses can be a protected “housing service” — it changes what’s allowed, so we ask now, not later. Why this matters →
Stored and confirmed
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