A former tenant still having a working key is a small uncertainty that can become a serious security problem. So, when should landlords change locks? The practical answer is whenever control of the property’s keys is unclear, a lock is no longer secure, or a new tenancy is about to begin. But landlords must also respect a current tenant’s right to live in their home without interference.
When landlords should change locks between tenancies
The best time to change locks is after one tenancy has fully ended and before the next tenant moves in. Even where every set of keys appears to have been returned, you cannot know whether copies were made during the tenancy or passed to a partner, relative, tradesperson or previous occupier.
Changing the external door locks at each changeover gives the incoming tenant a clear starting point: they know that only authorised people should have access. It also reduces the risk of disputes if there is a later report of missing items or unauthorised entry.
This does not always mean replacing every lock from scratch. Depending on the door and lock type, a locksmith may be able to change only the cylinder or internal mechanism. That can be a more cost-effective option, provided the overall lock, door and frame are in good condition.
For landlords managing several properties, make lock changes part of the standard void-property checklist alongside inspections, smoke alarm checks and repairs. It is simpler, easier to record and far less stressful than responding after a security concern has arisen.
Change locks immediately after a security incident
Some situations should be treated as urgent rather than left until a convenient appointment. Arrange a lock change or security repair promptly if there has been a break-in or attempted break-in, keys have been stolen, or a tenant reports that keys are missing and may be identifiable with the address.
A lock should also be assessed after damage to the door, frame, cylinder, handle or letterplate. A door might still close, but that does not mean it is secure. Forced entry can weaken fittings, misalign a multipoint mechanism or leave a cylinder vulnerable to further attack.
Other warning signs include a lock that sticks, turns loosely, needs repeated attempts to operate, or has been affected by a snapped key. These are not merely maintenance inconveniences. A failing lock can leave a tenant unable to secure the property or unable to get back inside.
In an emergency, prioritise making the property secure, documenting the damage and checking whether other entry points have been affected. A professional locksmith can explain whether a repair is sufficient or whether replacement and a security upgrade are the safer choice.
When should landlords change locks during a tenancy?
This is where landlords need to proceed carefully. A rented property is the tenant’s home. While the landlord owns the building, a tenant generally has the right to quiet enjoyment and exclusive possession for the term of their tenancy. Changing locks to enter the property, pressure a tenant over rent, or stop them getting in is not an acceptable remedy for a tenancy dispute.
Do not change locks while a tenant is still legally entitled to occupy the property unless there is a genuine emergency, the tenant has agreed, or you have followed the correct legal process for regaining possession. Changing locks without lawful authority can lead to serious allegations of unlawful eviction or harassment.
For routine repairs, inspections or planned improvements, arrange access in advance and give appropriate written notice. Even with notice, access should be at a reasonable time and with the tenant’s agreement where possible. An emergency is different: for example, a serious leak, fire damage or an immediate risk to the property or people inside may justify urgent entry.
If a tenant asks for locks to be changed because of domestic abuse, stalking, a relationship breakdown or a credible threat, take the request seriously and respond quickly. The legal position and responsibility for costs can depend on the tenancy agreement and circumstances, but the immediate safety risk should not be dismissed. Clear communication and a swift security assessment can make a meaningful difference.
If a tenant has changed the locks
Tenants may change locks in some circumstances, but the tenancy agreement may set out requirements around permission, standards of replacement hardware and the landlord’s right of access for lawful repairs. Avoid assumptions or confrontation. Ask the tenant to confirm that the property remains secure and agree a sensible way to arrange access when it is legitimately required.
The key point is that neither side should use lock changes as leverage. Keep discussions in writing, refer to the tenancy agreement and seek proper housing advice where there is a disagreement about access or possession.
Choose the right lock work, not just the quickest fix
A change of tenancy is also a good opportunity to look at whether the existing locks provide suitable protection. Older cylinders, worn mortice locks and poorly fitted uPVC door mechanisms can compromise a property even when the key still works.
The right solution depends on the door. A timber front door may use a mortice lock and night latch, while a composite or uPVC door commonly has a euro cylinder and multipoint locking system. Replacing a cylinder may be enough after a lost key, but repeated faults, visible damage or an outdated lock may call for a wider repair.
For properties at higher risk, consider upgrading to a high-security cylinder with anti-snap protection, such as a 3-star rated option. This can be particularly worthwhile where the existing cylinder protrudes from the handle or has little resistance to common forced-entry methods. The door, frame, handles and installation all matter too. A high-specification lock fitted poorly will not deliver the protection it should.
Keep a written record of any work carried out, including the date, reason for the change, the locks fitted and who holds authorised keys. This is useful for property management, deposit discussions and insurance records. It also helps you maintain consistent standards across a portfolio.
A sensible process for a lock change
Before booking work, establish who is entitled to occupy the property and whether there is any immediate safety concern. If the property is vacant, arrange the change before handing it over. If a tenant is in place, communicate clearly, agree access and explain why the work is needed.
Once the work is complete, test every lock, handle and key operation from both sides of the door. Confirm that windows and secondary access points are secure too, especially following a break-in. Give the tenant clear information about the new lock and make sure they can secure the property properly when leaving.
Avoid choosing a locksmith on price alone, particularly after a burglary or late-night fault. Ask for clear costs, appropriate identification and an explanation of the work before it begins. For landlords across Birmingham and the West Midlands, DGM Locksmiths can attend urgent security problems and provide practical advice on replacement locks, damaged doors and security upgrades.
The safest approach is simple: change locks between tenancies as standard, act quickly when keys or security are compromised, and never use locks to bypass a tenant’s legal right to occupy their home. A planned lock change costs far less than the consequences of an avoidable security failure.