A tenant moves out on Friday, the next viewing is on Monday, and a set of keys has not been returned. That is exactly when a small weakness can turn into a costly problem. A landlord property security audit gives you a clear picture of who can access the building, whether the doors are doing their job and what needs attention before a property is left empty or re-let.

For landlords and letting agents, security is not just about fitting the most expensive lock available. It is about checking the full route into a property, dealing with faults early and having a sensible plan when keys go missing, a tenant reports a problem or a break-in causes damage.

Start the landlord property security audit between tenancies

The best time to inspect security is when the property is vacant and you can test every entrance without disturbing a tenant. Do not rely on a quick glance at the front door. Walk the property as somebody looking for an easy opportunity would, including side gates, rear access, garages, communal areas and ground-floor windows.

Start by confirming which doors are used most. A front door may have a good cylinder and a proper deadlock, while the rear UPVC door has a loose handle or a multipoint lock that no longer engages fully. In practice, the weaker door is often the one that causes the call-out.

Try each lock with its key. The key should turn smoothly, the handle should lift properly where required, and the door should lock without being pulled, pushed or lifted into position. Needing to force a handle is not normal wear to ignore. It can be an early sign of an issue with a UPVC mechanism, keeps, hinges or gearbox.

Make a written record with dated photographs. This helps track recurring faults, supports a discussion with contractors and gives you a useful condition record at the start of a tenancy.

Check the doors before focusing on the lock

A quality lock cannot compensate for a poorly aligned, damaged or weak door. Look closely at the frame, hinges, letter plate and surrounding timber or UPVC. There should be no significant movement when the locked door is pushed, and the strike plate or keeps should be firmly fixed rather than pulling away from the frame.

Timber doors deserve particular attention after wet weather. Swelling, splitting around the lock case and loose hinges can stop a lock from engaging as intended. With composite and UPVC doors, check that the sash sits squarely in the frame. A door that has dropped slightly can place strain on a multipoint locking system every time it is operated.

External patio and French doors need a practical test from both inside and outside. Check that the locking points engage across the full height of the door, not just at the handle. Also inspect accessible glazing, particularly if a thumbturn cylinder could be reached by breaking a nearby pane. The right arrangement depends on the door design and fire-escape requirements, so avoid fitting a lock type simply because it looks more secure.

Assess cylinders, mortice locks and multipoint systems

Not every lock needs replacing. Where a cylinder is working correctly and is suitable for the door, a repair or adjustment elsewhere may be the sensible and lower-cost answer. Equally, a lock that still turns is not automatically secure.

On euro cylinder doors, check for obvious protrusion beyond the handle backplate, signs of damage and stiffness when locking. If keys have been lost or not returned, changing the cylinder is usually the direct way to restore control without replacing the whole mechanism. Keep a record of the key type and the number issued.

For timber doors with mortice locks, test the bolt throw and make sure the key operates cleanly from both sides where applicable. A loose rim cylinder on a night latch, worn screws or a poorly fitted keep can reduce the benefit of an otherwise good lock.

UPVC and composite doors should be tested with care. Lift the handle, turn the key and check that every hook, roller or bolt engages. If the handle spins, feels floppy or the key will not turn once the handle is lifted, stop forcing it. Continued use can turn an adjustment issue into a failed gearbox or a lockout. Early repair is generally less disruptive than waiting until the mechanism fails with tenants inside or the property vacant.

Control the keys, codes and access list

Keys are a security system in their own right. The audit should identify every person with access: current tenants, outgoing tenants, letting staff, maintenance contractors, cleaners, relatives, previous occupants and anyone holding an emergency spare.

At every change of tenancy, establish whether all keys have been returned. If there is any doubt, change the relevant external cylinder or agree a clear risk-based approach with the owner. It may feel inconvenient when a key is merely unaccounted for, but it is far easier than explaining why an unauthorised person was able to enter later.

Key safes are useful for managed properties, emergency access and contractor visits, but only when fitted in a considered location and the code is controlled. Do not leave a key safe in an obvious position beside the door with a code shared widely by text message. Change the code when staff, tenants or contractors change, and remove access where it is no longer needed.

A simple access register should show what has been issued, to whom, and when it is due back. This is especially useful for HMOs, blocks, student lets and properties with frequent maintenance visits.

Look beyond the front door

Rear gardens, side passages and detached garages are often less visible from the road. Check that gates latch securely, garage doors lock properly and any side entrance is not hidden by overgrown planting. Security and safety need to work together, so do not block a required escape route or create an obstacle that makes emergency access difficult.

Windows on the ground floor, above flat roofs or beside drainpipes should close and lock. Missing keys for window locks are worth sorting, particularly in a vacant property. Check shared entrances as well. A communal door that does not close fully can undermine the security of every flat beyond it.

Lighting has a role, but it is not a substitute for sound physical security. A well-positioned light can make access less attractive and help tenants return safely after dark. Poorly aimed lights, however, can annoy neighbours or shine into bedrooms. It depends on the property layout.

For a quick but thorough inspection, make sure you cover these areas:

• Every external door, frame, hinge, handle, lock and glazing panel.
• UPVC, composite and patio-door alignment, including full multipoint lock operation.
• Window locks, accessible garages, sheds, side gates and communal entrances.
• Key numbers, key-safe codes and the list of people with authorised access.
• Signs of attempted entry, loose fittings, damaged frames or unexplained lock changes.

Plan for vacant properties and damage

An empty property has different risks from an occupied one. Post should not build up, broken windows should not remain exposed and a failed lock needs dealing with before the property is left overnight. If there has been forced entry, protect the opening first, then assess the door, frame and locking hardware properly. Replacing only the visibly damaged cylinder may not resolve damage to the keeps, mechanism or frame.

Emergency boarding can provide temporary protection after a smashed window, damaged shop front or forced door while the permanent repair is arranged. It is a holding measure, not the finished job. Revisit the property promptly to make sure the final door or window repair restores proper locking and weather protection.

Keep details of a local 24-hour locksmith available for tenants and property managers, with clear instructions on when to call. For example, a tenant locked out with proof of residence needs urgent access, while a stiff UPVC handle may be booked before it becomes a full failure. Locksmiths Gloucester can assess damaged locks, lost-key situations, multipoint mechanisms and emergency boarding work, with an emphasis on non-destructive entry where the lock and circumstances allow.

Decide what to repair now and what to monitor

A useful audit separates immediate risks from maintenance items. A door that will not lock, a missing key after a tenancy ends, a damaged cylinder or a broken ground-floor window needs prompt action. A slightly stiff handle with full lock engagement may be monitored briefly, but it should still be booked in before the next void period if the fault is getting worse.

Avoid treating replacement as the only answer. Door realignment, new keeps, a handle repair or a gearbox replacement may resolve the actual fault and avoid changing parts that are still serviceable. On the other hand, delaying work because a lock can be persuaded to operate often costs more when it finally fails at night or during a tenant changeover.

Repeat the audit at each tenancy change, after any reported security incident and following major building work. A property is easiest to protect when small faults are dealt with while they are still small, leaving tenants with a home that locks properly and landlords with fewer urgent calls to manage.