Choose the lock around the door, and the way you use it.

Know what is already there

An existing lock leaves holes and measurements that influence what can replace it. Explain the door material, the current hardware and whether you are replacing a lock or adding one to a new position. A photo of both sides of the door and its edge may help when requested. Do not assume a product will fit because its finish matches the old one. Door condition and alignment also matter to the finished installation.

Think through everyday use

For a family entrance, consider who carries keys and whether a keypad would simplify access. For a rental, discuss permission and how keys or codes will be handed over. Electronic locks bring additional questions: batteries, code management, app requirements and a backup way to enter. Share the exact model before ordering it, particularly if you expect it to work with an existing smart-home system. Compatibility should be confirmed rather than inferred from a product description.

Agree on the full job

Replacing like-for-like hardware can differ from preparing a door for an additional lock. Ask whether the proposed work includes removing the old unit, any required preparation, fitting the new hardware and checking its operation. If separate door repairs are needed, have that explained before the installation proceeds. Once fitted, try locking and unlocking from the appropriate sides, confirm the latch engages without forcing the door and review how the keys or codes will be managed.

Buying the lock yourself? Check first.

Before ordering hardware, share the exact product model and the type of door. Existing holes, door thickness, handing and available space can affect the fit. For electronic products, clarify whether the requested work includes only fitting the hardware or also setting up agreed access features. Keep packaging and instructions until compatibility has been confirmed. If the chosen model is unsuitable, discuss the alternatives before anyone changes the door or opens additional holes.

A useful checklist

What to have ready

• Explain whether this is replacement hardware or an additional lock.
• Provide the new product's exact brand and model if already purchased.
• Mention sticking doors, damaged frames or unusual existing hardware.
• Confirm the installation scope, product responsibility and estimate before work begins.

Questions about this service