"It is unlawful for the owner of a residential building in the City of Mill Valley to sell or exchange the same without first having obtained" a resale report. That sentence sits in the municipal code, unchanged since 1973, and it sounds like the kind of rule that closes a door. It reads like permission the city has to grant before a deed can record.
It isn't. Mill Valley's own building department says so directly: the city has no authority to hold up a sale. The report is mandatory. The consequence of what it finds is optional, and it lands on whoever owns the house the day escrow closes.
What the Ordinance Actually Requires
The Residential Building Report, known locally as an RBR, applies to every residential property that changes hands inside city limits: single-family homes, apartment buildings, condominiums, and mixed-use buildings. The requirement traces to Ordinance 789 in 1973 and was updated by Ordinance 1261 in 2013, and it's codified in Mill Valley Municipal Code sections 20.70.020, 20.70.040, and 20.70.070. Under 20.70.070, selling a residential building without first obtaining and delivering an RBR to the buyer is against the law. Under 20.70.040, the report has to reach the buyer before the sale actually closes.
An inspector from the city comes out, walks the property, and produces a document that becomes part of the transaction file. The city's Resale RBR page directs agents to apply for the report online, and the guidance is consistent everywhere it appears: order it early, because the report needs time.
The Loophole Built Into the Law
Here's where the ordinance stops behaving like a gate. Mill Valley's FAQ answers the obvious question directly: can the RBR postpone the close of escrow? The city's answer is no. It doesn't have the authority to hold up the sale of a property.
What happens instead is a transfer. If the report identifies unpermitted work or a code violation, that violation doesn't vanish and it doesn't have to be fixed before the sale. It becomes the legal responsibility of the new owner the moment title changes hands. The seller can hand off a documented problem and still close on schedule. The buyer inherits it whether they read the report closely or not.
This is the part that generic closing checklists skip past. A mandatory inspection that can't block a sale isn't there to protect the transaction from a bad house. It's there to make sure someone on paper knows what they're buying, and that someone is no longer the seller once the deed records.
What the Inspector Is Actually Looking For
The city describes the inspection's purpose in plain terms. It's a cursory review aimed at three things:
- Life safety or sanitation issues with the potential to cause injury
- Illegal construction
- Unpermitted second units
That third category carries particular weight in a town like Mill Valley, where older housing stock on hillside and canyon lots has a long history of in-law units, converted garages, and lower-level additions built without permits over the decades. An RBR is one of the few moments in a transaction where someone with city authority is specifically looking for that kind of work, rather than a home inspector focused on systems and structure.
Once the inspection is done, the city generally treats the report as final. Reports aren't revised and re-inspections aren't required. If something is flagged, the owner can pull emergency permits to address an immediate safety concern, but full permits for the underlying work won't be granted until the unpermitted portion is resolved. That distinction matters: an emergency permit calms a hazard. It does not legalize the addition that caused it.
What the Report Costs, By Property Type
| Property | RBR Fee |
|---|---|
| Single-family home | $389 |
| Each additional unit | $89 |
A single-family home with one legal in-law unit runs $478 total. A duplex or a property with a second dwelling adds another $89 per unit on top of the base fee. It's a modest cost relative to a Marin transaction, but the fee isn't the part that matters. The report it buys is the thing that determines whether a known issue gets negotiated before closing or discovered by the new owner after.
The Timing Problem Escrow Doesn't Forgive
A standard financed transaction in California typically runs 30 to 45 days from acceptance to close, and the customary purchase agreement gives buyers a default window of around 17 days after acceptance to remove major contingencies, including inspection and disclosure items. Layer an RBR into that calendar and the timing gets tight fast.
The city's own guidance is to request the report as early in the process as possible, specifically because it takes time to schedule the inspection, receive the findings, and address anything mandatory before the report needs to reach the buyer. A seller who waits until midway through escrow to order the RBR risks a scenario where a flagged violation surfaces after the buyer has already removed most of their contingencies, at which point the conversation shifts from "let's negotiate a repair credit" to "we're already committed, now what."
Ordering the report the day a home goes on the market, rather than the day it goes into contract, gives everyone involved a working document before the negotiation clock starts.
Two Sides of the Same Report
If you're selling. The RBR isn't a hurdle to clear quietly and move past. It's an early warning system for exactly the kind of thing that complicates a closing: an unpermitted second unit, a life-safety item that needs an emergency permit, a piece of construction history nobody currently living in the house actually witnessed. Ordering it before listing turns a potential mid-escrow surprise into something you can price, disclose, or address on your own timeline instead of the buyer's.
If you're buying. The report isn't paperwork to skim on the way to signing. It's the one document in the file specifically built to answer whether the house has unpermitted work, and the city has already told you it won't stop the sale even if the answer is yes. Reading it before your contingency deadlines close is the only leverage you have to negotiate a credit, request repairs, or walk away with your deposit intact.
A Few Questions Worth Asking
Does every Marin town require something like this? No. The RBR in this specific form, with this fee structure and this inspection scope, is a Mill Valley requirement. Other Marin cities and the county have their own disclosure practices, and they aren't identical to this one.
What if a violation is found but nobody wants to fix it before closing? The city can't force a repair before the sale, but it also won't issue new permits on the property until the unpermitted work is addressed. That limitation follows the house, not the seller, so it becomes the new owner's problem to solve before doing any future permitted work of their own.
Can I ask for a re-inspection if I disagree with the findings? Generally, no. The city treats completed reports as final rather than something to revise, so the RBR that gets delivered is typically the one both sides work from for the rest of the transaction.
A house doesn't get less complicated because a report exists. It gets more legible, and legibility is worth something in a market where the difference between a smooth close and a stalled one often comes down to who knew what, and when.
If you're weighing a Mill Valley purchase or sale and want to understand exactly how this fits into your specific timeline, Rick van der Wal can walk you through it before you're staring down a contingency deadline. Let's Connect.
