Start with the key type
Key types differ, so get in touch with a description of the key and the lock it operates. A photo can help identify the style before discussing whether it can be cut.
Key cutting is listed among the services described by the business. Availability depends on the key type, so contact the locksmith first rather than assuming every format can be copied.
Do not send a photo that shows detailed cuts if you would rather keep that information private. A broad description of the key and lock is a good place to start.
What to mention when you call
Explain the door or lock type if you know it, what has changed and whether the door still locks. For non-urgent enquiries, a photo can help show the hardware.