What the Sanitary Code requires of the owner
Turnover is the moment a building's keys stop being accounted for. A tenant hands back two keys, and nobody can say whether there were three. In a Brockton three-decker where one common entry serves every unit, that is not only a question about one apartment.
Two Massachusetts rules sit behind this. One says what locks an owner must provide; the other lets certain tenants require a lock change on a short deadline. What follows states what each says, and where rekeying and lock changes in Brockton fit around them. None of it is legal advice.
The provision is 105 CMR 410.480, the locks section of the Massachusetts State Sanitary Code. It assigns the duty plainly: "The owner shall provide, install and maintain locks" meeting its standards. That obligation sits with the owner, not with a hardware-store deadbolt.
What it calls for:
- "Every entry door of a dwelling unit or rooming unit shall be capable of being secured from unlawful entry."
- In a building with more than three dwelling units, the main entry door must be "so designed or equipped so as to close and lock automatically with a lock, including a lock with an electrically-operated striker mechanism, a self-closing door and associated equipment."
- Other common entryway doors and exterior doors must "be equipped with an operating lock."
The three-unit line, and what it does not mean
The threshold is more than three dwelling units. A three-family house has three, placing it below the line; a four-unit building is above it, and its main entry door falls within the self-closing, automatically locking requirement. Brockton's rental stock is full of three-deckers, so the line runs through the middle of the city's housing.
What the threshold does not touch matters as much. Every entry door of a dwelling unit must be securable against unlawful entry whatever the unit count, and common entryway and exterior doors need an operating lock on the same terms.
Only the self-closing main entrance turns on unit count, so exceeding the standard is not a fault and its absence in a three-family is not by itself a violation. A three-family and a four-unit conversion can sit on the same Montello block on opposite sides of that line, and anyone unsure should ask the city.
Rekey or replace, and keying alike versus a hierarchy
Rekeying keeps the hardware and re-stacks the pins inside the cylinder so a new key works and the old one does not. Replacement changes the hardware, and suits a lock that is worn, damaged, of too low a grade for an exterior door, or too old for parts. Between tenants rekeying is usually the answer, so most lock changes in apartments and commercial units involve no new hardware.
Several cylinders can be keyed alike, putting a front door, back door and basement entry on one key. In a multi-family the same technique builds a hierarchy: one key for a unit, another for the common entry, and one that opens both. A unit key can then change at turnover without reissuing every other tenant's.
A hierarchy is designed on paper before any cylinder is pinned, because the structure decides which keys can exist; retrofitting one onto unrelated locks means re-pinning all of them. Cylinder count, lock type, and whether keys are cut on site or at a bench shape the cost of a lock change.
The lock change a tenant can require, and on what terms
M.G.L. c. 186, s. 26 creates a separate route. A tenant, co-tenant or household member who is at least 18 or an emancipated minor, and who reasonably believes they are under imminent threat of domestic violence, rape, sexual assault or stalking, may request that the locks be changed. The owner may request proof of victim status; where the threat is from a tenant, co-tenant or household member, the request must include either a valid protective order under chapter 209A or chapter 258E, or court or law enforcement records showing the imminent threat.
The deadline is the operative part: the owner must, "within 2 business days, make a good faith effort to change the locks or give the tenant, co-tenant or household member permission to change the locks." If the owner does not comply in that time, the tenant may change the locks themselves, installing locks of equal or better quality in a workmanlike manner. The statute also provides that the tenant, co-tenant or household member "shall not voluntarily give the new key to the perpetrator", and an owner who refuses a key to an alleged perpetrator has no liability for that refusal.
On money the section is specific without naming a figure: "An owner may charge a fee for the expense of changing the locks. The fee shall not exceed the reasonable price customarily charged for changing such locks in that community." An owner who violates it is liable for actual damages or three months' rent, whichever is greater, plus attorney's fees, unless the court finds the owner acted in good faith.
What applies to a particular tenancy is a question for a housing advice service or the city.
The doors everyone forgets
The trigger is turnover rather than the calendar: when a keyholder leaves, a key goes missing, or a contractor finishes a job, the keys that person held should stop working. A change of occupancy tends to cover the front door and stop there.
The test is which keys a departing keyholder could have held. Where a hierarchy is in use, changing the common entry means checking every unit key that opens it.
- The mailbox lock, on a separate key nobody counts as a building key.
- The rear stair door, a full exterior door serving every floor.
- The bulkhead over the basement stairs, and any cellar door.
- Storage and utility rooms, where an old key often still turns.
- Any lock a contractor had access to during a recent job.
Three short answers
Does a Brockton three-family need a self-closing main entrance?
The self-closing, automatically locking main entry door requirement in 105 CMR 410.480 applies to a building with more than three dwelling units, so a three-family sits below that threshold and a four-unit building sits above it. Every entry door of a dwelling unit still has to be capable of being secured from unlawful entry whatever the unit count, and common entryway and exterior doors still need an operating lock. Whether a particular building meets the standard is a question for the owner, the property manager or the city.
How quickly must a landlord change the locks for a tenant under threat?
M.G.L. c. 186, s. 26 requires the owner, on a qualifying request, to make a good faith effort within 2 business days either to change the locks or to give the tenant permission to change them. If that does not happen, the statute allows the tenant to change the locks themselves, installing locks of equal or better quality in a workmanlike manner. The owner may request proof of victim status, and where the threat is from a tenant, co-tenant or household member the request must include a valid protective order or court or law enforcement records. Anyone in that position should raise it with the owner or property manager, or ask a housing advice service what applies to their own tenancy.
Is rekeying enough between tenants, or should locks be replaced?
Rekeying re-stacks the pins inside the existing cylinder so the old key stops working, and between tenants that is usually sufficient because the hardware itself is fine. Replacement makes sense when a lock is worn, damaged, of too low a grade for an exterior door, or too old for parts to be available. The decision turns on the condition and grade of the hardware rather than on how long it has been in the door.