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Thursday, 31 March 2016

How to Fit a Letterbox

How to fit a letterbox


So you want to know how to fit a letterbox? Then you have come to the right place! NW Window Repairs will show you how to install a letterbox using simple measurements.

How to fit a letterbox : Method 1 – Measure the outside of your existing letterbox
This is the most simple method of checking you are purchasing the correct sized letterbox.

There are 3 sizes of letterboxes available on the market. These are:

1    1)      10" UPVC Letterbox (265mm x 70mm)
2    2)      12" UPVC Letterbox (305mm x 70mm)

Usually, buying the same size as you have previously had will be sufficient. However, if you want to make 100% sure you have the correct sized letterbox, or if you want to know how to install a letterbox from scratch, then please look at method #2 below.

How to install a letterbox : Method 2 – Inside measurements

The internal measurement of the letterbox, will always determine what size you require. So if you have got the hole cut out already without a letterbox in, or if you require a hole to be cut out to install a letterbox, then you will need the following measurements:

1    1)      To use a 10” letterbox, the hole will need to be 215mm to 245mm in width, and 37mm to 55mm in height.
2    2)      To use a 12” letterbox, the hole will need to be 250mm to 290mm in width, and 37mm to 55mm in height.
3    3)      To use a 12” Slimline letterbox, the hole will need to be 260mm to 280mm in width, and 30mm to 40mm in height.

Each letterbox comes with telescopic sleeves, which allows for the thickness of the door itself.

Letterboxes which are fitted through moulded panels are between 20mm to 40mm in size.
Letterboxes which are fitted through the frame, are between 40mm to 80mm in size.

Now you know the size required, how do you actually FIT your letterbox?! These 4 simple steps will show you from start to finish:

How to fit a letterbox

Step 1 – Remove your old letterbox if you have one. (If you don’t already have a letterbox hole, then you will need to use the measurements above to cut the correct size required.)
Step 2 – Place the back panel on to the inside of the door. This should easily fit in to the hole.
Step 3 – Place the screws in to the holes. (If you require the holes to be drilled, use a pencil to mark where the screws are, and drill out)
Step 4 – The tricky bit! Reach around your door whilst still holding the back panel in place, and push the front panel in to place. There are 2 holes to receive the screws. (You may need someone to help you with this!)

Note: Sometimes you may find that the screws are slightly too long, especially if you have a thinner than average door.

And that is it! 4 simple steps on how to install a letterbox!


Please browse our recommended Letterboxes which are available to buy from Amazon .

Can't find what your looking for? Why not search Amazon now!

Thank you for taking the time to read our post, and remember: Sharing is Caring!

NW Door and Window Repairs


From Luton to London
Window and Door Refurbishment and Repair Specialists 

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