Landlords need lock changes for several reasons: a new tenancy, lost keys, a burglary, a broken lock, a tenant who has abandoned the property or a lawful eviction. The practical security need is clear, but the legal context matters.
Changing locks at the wrong time or without the correct authority can create serious problems. Security should support lawful possession, not shortcut it.
This guide is practical rather than legal advice prepared by experts at LocksmithLocal. For eviction decisions, landlords should follow the correct legal process and take advice from a qualified housing professional or solicitor where needed.
A locksmith can secure a property, but they should not be used to bypass tenant rights.
Lock Changes Between Tenancies
Changing or rekeying locks between tenancies is sensible. You cannot know how many keys a previous tenant copied or shared. Even when keys are returned, copies may exist with relatives, cleaners, carers, contractors or neighbours. A fresh cylinder or rekey gives the incoming tenant security and protects the landlord’s property.
The priority is external doors: front, back, side, communal access where controlled by the landlord, garage personnel doors and any door connecting to the dwelling. Accessible window locks, patio locks and outbuilding locks should also be checked.
Rekeying Versus Replacing
Rekeying may be possible if the existing hardware is good and part of a planned key system. Replacement may be better when locks are worn, keys are missing, cylinders are basic, anti-snap protection is lacking or the door needs an upgrade.
On uPVC doors, changing the euro cylinder is often quick and effective. On timber doors, a mortice lock may need replacing if it does not meet the right standard.
For landlords with multiple properties, keyed-alike or restricted key systems can reduce administration, but they must be designed carefully. One lost master key should not compromise an entire portfolio.
Do Not Change Locks During a Live Tenancy Without Authority
A landlord generally cannot simply change the locks to force a tenant out. If a tenancy is still in place, lock changes must be lawful and appropriate. Examples may include emergency repair with tenant consent, securing after a break-in, or acting under the correct legal authority after possession has been obtained. The details depend on the tenancy and circumstances.
If there is any doubt, pause and get legal advice. A locksmith should be willing to ask for evidence of authority before attending an eviction-related lock change.
Lock Changes After Lawful Possession
Once lawful possession has been obtained and the landlord is entitled to secure the property, lock changes should be done promptly. Eviction days can be sensitive. The emergency locksmith may need to work alongside enforcement officers, the landlord, agent or solicitor. The goal is to secure the property without unnecessary damage.
After entry, check every access point. Former occupants may have keys to back doors, garages, sheds or communal entrances. If the property has a multi-point uPVC door, inspect alignment and mechanism condition as well as changing the cylinder.
Abandoned Properties
Abandonment is tricky. A property may appear empty, but that does not always mean the tenancy has ended. Before changing locks, follow the correct process and document evidence. If you are legally entitled to secure the property because it is genuinely abandoned or at risk, consider temporary measures and keep records of why action was taken.
A locksmith can help secure a door after damage or risk, but the landlord must be confident about authority.
Emergency Repairs and Tenant Safety
If a lock fails during a tenancy, the landlord may need to repair it quickly. A door that cannot lock is a security issue. A door that cannot open may be a safety issue. Tenants should report faults early, and landlords should not delay necessary repairs.
When replacing locks during a tenancy, provide the tenant with new keys promptly and keep any landlord-held access arrangements compliant with the tenancy agreement and law. Do not retain keys or access in a way that breaches quiet enjoyment or privacy obligations.
HMO and Shared Buildings
HMOs and shared buildings need extra care. Bedroom locks, communal doors, fire doors and escape routes must be suitable. Locks on escape routes should allow safe exit without searching for a key where required. Door closers, fire door integrity and access control must be considered together.
Do not fit a stronger lock that compromises fire safety. For shared entrances, changing a lock affects multiple occupants, so communication and key distribution matter.
Key Control for Landlords
A key register is essential. Record which keys exist, who holds them, when they were issued and when they were returned. Avoid labels with property addresses. Store spare keys securely. For agents, contractors and maintenance teams, use sign-out procedures. If keys are lost, record the decision to rekey or not.
Restricted key systems can prevent unauthorised copying, but they require proper administration. Standard keys are cheaper, but copying cannot be controlled.
Insurance and Standards
Check insurance policy wording. Some policies require specific lock standards on external doors or accessible windows. If a tenant changes a lock without telling you, it may affect your ability to prove compliance. Provide tenants with guidance on reporting lock faults and getting permission before changing locks themselves.
After a burglary, upgrade rather than simply replace like-for-like if the old hardware was weak. Anti-snap cylinders, better mortice locks, patio door security and window locks may all be relevant.
Practical Checklist for Tenant Turnover
At check-out or before re-letting:
- Collect all keys and compare with the key register.
- Change or rekey external locks where key control is uncertain.
- Check uPVC mechanisms for stiffness or dropped doors.
- Test patio, French, garage and window locks.
- Replace missing window keys or handles.
- Check communal access arrangements.
- Review fire exit and HMO door requirements.
- Update the inventory with new key counts.
- Give the incoming tenant clear operating instructions.
This reduces emergency calls during the new tenancy.
Working With a Locksmith
Tell the locksmith whether the property is occupied, vacant, between tenancies, subject to lawful possession or being secured after damage. Provide authority where needed. Ask for an invoice that identifies the locks fitted, the keys supplied and any recommendations. For portfolio landlords, ask about planned key systems rather than one-off reactive changes.
A locksmith should help you secure the property while respecting legal and safety boundaries.
The Practical Answer
Landlords should change or rekey locks between tenancies, after key compromise and after lawful possession where appropriate. They should not use lock changes as an unlawful eviction tool. The best approach is planned key control, prompt repairs, insurance-aware hardware and careful documentation.
