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A rental property is only as secure as the keys that have been handed around over time. Former tenants, contractors, cleaners, relatives and letting agents may all have had access, often with no clear record of who still holds a copy. This landlord lock change guide explains when changing locks is sensible, how to protect your property without interfering with a tenant’s rights, and when to call a local locksmith.
When should a landlord change the locks?
For most landlords, the best time to change external door locks is between tenancies. Once a tenant has moved out and you have lawful possession of the property, replacing or rekeying the lock gives the next tenant a clean start and gives you a clear record of the keys in circulation.
It is particularly worthwhile after a long tenancy, where keys have been lost, after relationship breakdowns or where several people have occupied the property. It is also sensible after a break-in, attempted burglary or any incident where a key may have been stolen alongside information identifying the address.
A lock does not have to be visibly damaged to justify replacement. If it is worn, difficult to operate, loose on the door or starting to stick, deal with it before it fails. A tenant locked out late at night because a tired euro cylinder has failed is inconvenient for everyone and can quickly become more costly than a planned repair.
For a newly purchased rental, changing the locks should be one of the first jobs on completion day. You cannot know how many previous copies exist, even if the seller provides a full set of keys.
Landlord lock changes and tenant access
Security work must never be used to pressure a tenant or to regain control of an occupied property. In England and Wales, tenants have a right to quiet enjoyment of their home. Changing the locks while they are still legally entitled to live there, without making suitable arrangements for their access, may amount to unlawful eviction or harassment.
This applies even where rent arrears are causing understandable concern, a notice has been served or a dispute is ongoing. Regaining possession has a legal process. Lock changes are not a shortcut around it. If you are unsure of your position, take advice from a qualified housing professional before arranging any work.
There are legitimate reasons to attend an occupied property. A lock may have broken, a key may have been stolen, or police may have advised a security upgrade after an incident. Speak to the tenant first wherever possible, explain the reason for the work, agree access and make sure they receive the new keys immediately. In a genuine emergency, such as a failed lock leaving the home insecure, prompt action is usually in everyone’s interests.
Tenants may also change locks during a tenancy. The tenancy agreement may set out expectations about supplying a key or restoring the original lock at the end of the tenancy. Whatever the agreement says, the practical issue is access in a real emergency and maintaining the security of the property. A calm conversation is normally far more effective than assuming the worst.
Choosing the right replacement lock
The right lock depends on the door, the property and the insurer’s requirements. A locksmith should inspect what is already fitted rather than arriving with a one-size-fits-all upgrade. Not every door needs its entire locking system replaced.
For uPVC and composite doors, the euro cylinder is often the component that needs attention. If the multi-point mechanism works correctly but the cylinder is damaged, worn or vulnerable, replacing the cylinder may be enough. Where the handle is loose, the key turns without operating the bolts, or the door has become difficult to lift and lock, the mechanism and alignment should also be checked.
Timber front doors may use a night latch, a mortice lock or both. Fire doors, communal entrances and commercial premises have their own requirements, so it is worth choosing a locksmith who understands the door as well as the lock.
Look for products that meet the standard specified by your insurer, if one is stated. British Standard locks and security-rated cylinders can be appropriate, but the best choice still depends on the door construction and risk level. Spending more on a high-security cylinder is worthwhile if the rest of the door, frame or letterplate is weak only when those weak points are addressed too.
A practical landlord lock change process
A clear process avoids arguments, missing keys and unnecessary callouts. Start by recording the existing keys when a tenant gives notice. Ask for all original keys, copies, fobs, garage remotes, window keys and communal access devices to be returned as part of the check-out.
Once the property is vacant and possession is confirmed, inspect every point of entry. That includes front and rear doors, side gates, patio doors, shared storage areas, garages and accessible windows. You are looking for damage, stiff operation, loose handles and signs that locks have been forced or poorly repaired in the past.
Arrange the work before new tenants collect keys. A planned appointment gives time to select the correct lock, repair the door if needed and issue a controlled number of new keys. It also means the tenant is not left waiting while an old lock finally gives up during their first week.
Keep a simple key record with the date, door, lock type and number of keys issued. For a single flat, this can be a straightforward landlord file. For a portfolio or HMO, it should be part of a proper key-control system. Avoid marking keys with the full property address, particularly where they are carried by contractors or left with an agent.
Finally, test the lock from both sides with the door open and closed. A lock can appear fine when the door is open but bind once the door meets a misaligned frame. The tenant should know how the lock operates, particularly on multi-point doors that need the handle lifted before the key is turned.
Situations that need a faster response
Some problems should not wait until the next routine visit. A broken key in the cylinder, a door that will not secure, signs of an attempted break-in or a lost set of keys with an identifiable address all justify urgent attention.
After a burglary, preserving security comes first. A locksmith can assess whether the lock, cylinder, handle, frame or glass needs attention and make the property secure without recommending work that is not necessary. If the door has been forced, emergency boarding may be needed before permanent repairs can be completed.
For landlords living away from Bromley or managing several properties, having a trusted local contact matters. SJ Locksmiths Bromley provides direct, practical help rather than routing an urgent security problem through a national call centre. The aim should be to gain entry non-destructively where possible, repair what can be repaired and replace only the parts that genuinely need replacing.
Do not overlook internal and shared access
External doors get most of the attention, but internal security can matter too. Landlords may need secure locks on plant rooms, cleaning cupboards, meter cabinets, offices, stock areas or rooms containing tenant records. In shared houses, bedroom locks need careful consideration so that residents have privacy while the property remains safe in an emergency.
Communal entrances are another common weak point. A poorly closing door or a damaged latch can defeat even a good flat-door lock. Report and repair these faults promptly, and make sure the person responsible for the building understands the issue if you do not manage the freehold.
A sensible lock change is not about fitting the most expensive hardware available. It is about knowing who has access, maintaining the door properly and responding quickly when security changes. That gives incoming tenants confidence from day one and helps you protect the property without creating unnecessary disruption.
