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Replacement Mailbox Locks & Keys

made in britain

We manufacture over 130 different mail and parcel delivery boxes, and supply each mailbox with a security lock and two coded keys as standard with every product. We can supply both replacement keys and locks as required for any product from our range of mail and parcel solutions. The availability of coded keys is subject to whether a record of the key number has been kept by the owner of the mail or parcel box.

Replacement Letterbox Keys

We can cut replacement keys for mailboxes manufactured by ourselves – The Safety Letterbox Company, RENZ and MEFA after being supplied with the key code for the original keys. We can only provide you with a replacement key if you have the key number (this number would have been featured on the face of your old key and should have been recorded as per the instructions in your mailbox).

We will always advise you on the best and safest route to take when ordering replacement keys and locks. If you are new to a property that has previously been occupied then we suggest you change your lock as the previous occupiers may still hold keys.

Frequently asked Questions

  • Simply fill out the contact form ensuring all fields are completed and press submit.
  • Once the form is received we will contact you on the phone number provided to take your payment.
  • You will be asked a series of questions for security.
  • A new key will be cut and despatched to you within a week to the alternative delivery address that you provide.

If you do not have a key number, then you can only purchase a replacement mailbox lock. Unfortunately, we do not hold a record of key numbers for mailboxes for security reasons and cannot provide historic information on previous key numbers for your mailbox.

What are the prices of replacement keys?

Prices (which include VAT & Delivery) are as follows:

QTY: 1

QTY: 2

QTY: 3

QTY: 4

Please contact us for pricing for 5+ keys.

Key Enquiry Form

Your Details

Key Information

Mailbox Address

(this is the address of the installed mailbox)

Key Delivery Address

(must be different to the mailbox address)
Click or drag a file to this area to upload.



myRENZbox Retail Functional Overview


myRENZbox Retail Functional Overview

Click & Collect station, Click & Reserve or as a handover point & service acceptance point. All can be handled with ease with the myRENZbox.


SLB | Cotech Feature Brochure


SLB | Cotech Feature Brochure

A feature brochure between Cotech & The Safety Letterbox Company on innovative and durable antimicrobial coatings for mail and parcel boxes.