Change the locks the day you get the keys

They gave you all the keys they had. Six separate conversations say change or rekey the locks the day you take possession, because the people who could still hold a key are not exotic: the previous owners, their relatives, the last tenant and whoever the tenant lent one to, the estate agent, the builder or the trades who worked on the place, the cleaner, a neighbour. Thirteen separate notes in these conversations carry accounts of exactly that — three accounts of a former owner trying an old key on a sold house, one of a management company that never updated its records, and one of a spare key hidden forty years earlier that still turned. One account describes a former owner walking in with a pest-control worker; one says a flipper or a landlord may keep a key and treat the place as still theirs. None of this needs a villain: one account says keys to old addresses stay in circulation for decades, and one says common lock brands cut keys from a short list of patterns, so a key from a street away may fit. The cheap version, two conversations say, is rekeying — a locksmith, or a rekeying kit, changes the pins so the old keys stop working and you keep the hardware — and two conversations say swapping a cylinder yourself is a screwdriver job if you have the original key; one exchange, one account to two, argues whether doing it yourself or paying is cheaper once travel and callout are counted, and one account says a house with better-than-average locks is a job for a locksmith rather than a pinning kit. Two conversations say some agents hand over a gift card meant for exactly this, and one says theirs did not. Two accounts with homeowners’ associations warn that the finish of the new hardware may be regulated; one account cannot see why an association would care. Costs, and how to vet a locksmith beyond the price, are gaps in these conversations.

The garage, first. Three separate conversations say the door locks are only part of it: the opener remotes and keypad codes that came with the house still work for whoever holds the old remotes, and one caution says the fix is to clear the memory in the motor unit itself and pair your own remotes afterwards — replacing the handsets does nothing while the motor still knows the old ones. One account adds that anyone who worked on the house during construction could have paired a universal remote to it. Two conversations widen the list: keypad codes, a ceiling-fan remote, anything electronic that grants entry without a key gets reset, and one account adds parking fobs. One account in a block of flats says the original key sometimes opens more than one unit, which is a reason to rekey even where no former owner is in the picture. The exact steps to reset a given opener are a gap in these conversations; the model number is on the motor and the maker publishes them.

Sometimes, and the answer is in your agreement before it is in any tip. Two conversations say tenants can change locks with notice to the landlord, and one account says management and cleaning staff may hold keys the tenant never knew about until something goes missing; one objection says a lock change may breach a lease. This page checked one country: in England a tenant can usually change the locks unless the tenancy agreement says otherwise, must keep the original locks and put them back at the end, and may have to give the landlord a key, because a change of lock does not remove the landlord’s right to agreed access. In the United States the rules differ by state and by lease, and these conversations carry a single notice period as if it were general; this page does not, and names it as a gap. What works everywhere: read the agreement, then ask the landlord in writing to rekey or to let you rekey at your cost and hand over a key. If they refuse and you are frightened rather than merely cautious, the last question on this page is yours.

Two separate conversations say the shut-offs and the alarms, and both are in the safety line above; the accounts add the rest. Two conversations say look for what a previous occupant may have left: cameras or microphones in a house that came with smart devices, broken latches, and one account checks closets, attics and crawl spaces before the first night. Three conversations say a new home can carry hidden faults — a slow toilet leak, a smell from something buried in the garden — and one caution says smart-home devices left behind have inconsistent security and can be reached remotely, so resetting or removing them is the cautious move. One account puts a real, rated fire extinguisher in the house and makes sure the household knows how to use it; the linked first-aid page carries what to buy. One exchange, one account each way, argues whether the street water valve is easy to reach yourself or a call to the water company; one correction says in cold places it sits far below the frost line and needs a long key; one account says find the main valve inside the house. Utilities, HVAC and plumbing checklists beyond that are gaps in these conversations, and the linked inspection page is the one for a purchase.

Four separate conversations give the habit that costs nothing: the key is in your hand before the door closes — lock from outside with the key, or hold it while you pull the door — so a latch that catches unexpectedly never leaves you on the step. Two conversations say keep a backup plan in place before you need it: a spare with a trusted person nearby, or a hidden spare somewhere secure, rather than trusting the one key on your ring. One account paints the underside of the sliding-door latch white so it can be read as locked from across the room; one exchange, one account each way, argues whether saying a phrase or looking at the lock as you leave fixes it in memory, and the account against says the ritual blurs with repetition. Keypad or keyless locks divide the accounts: one says they end the lost-key problem and let you give a code to a house-sitter instead of a key, two conversations say the batteries die and lock you out, and one caution says a pet door beside one undoes it. Automatic latching doors, one account says, trade forgetting to lock for forgetting the key, and that account found the second worse. If you do get locked out: two conversations say emergency locksmith prices are high partly to deter non-urgent calls, one account’s locksmith picked the lock in seconds when the same trade was accused of dragging the job out, one caution says forcing your own door may cost you an insurance claim later, and one account keeps the old locks from a previous house so a broken one can be swapped without a callout. What to do in a lockout with no spare and no locksmith within reach is a gap in these conversations.

Three separate conversations say latch it, and the reasons they give are not the ones you might expect. Two single-conversation exchanges — four accounts to two, five to one — argue whether the main reason to lock is criminals or accidents, and the accidents side has the stories: delivery drivers, paramedics, a drunk from the party next door, a neighbour at the wrong house, a dog that has learned the handle, and raccoons, which several single accounts say can open a latched screen door — one caution says they will spend the night trying if they smell food; wind blows an unlatched door open too. The criminal side says an unlocked door reads as an invitation and that isolated houses are targets because no one is watching; one caution says an accidental intruder can turn dangerous if either of you reacts badly, so the point of the latch is to keep the encounter from happening at all. One exchange, two accounts to one, argues whether a locked door matters at the end of a long private drive behind a fence, and the account for locking says the habit is the point. One account says standard door screws are too short to reach the frame stud and longer ones in the strike plate make a kicked door far harder to open; one says kicking a door in is harder than films suggest. One account says a bedroom lock is worth having in a shared house. And one exchange, three accounts to two, argues whether to accept a spare key from a neighbour at all: the account for it had a neighbour with a key put out a fire the homeowner had started.

Change the locks, one account says, whether the parting was kind or not, because a key can be copied and lent; three accounts in one note say a former partner of a previous occupant tried the door. If a former owner or occupant has let themselves in, one exchange, one account each way, argues between calling the police at once and telling the person firmly that the house is yours; one caution says a confrontation can escalate quickly to violence or weapons, so do not confront alone. Entering a home you no longer have a right to is illegal even with a key, one caution says, and what you can do about it in law differs by place — the legal recourse is asked for throughout these conversations and is not answered here. If the person with the key is someone you are afraid of, a new lock is one step and not the plan: the pages linked below on leaving, and your local domestic-abuse service, are the ones for that.