How to Fit a Letterbox - Fitting a Letter Box into a UPVC or Timber Door

Summary: How to fit a letter box in wooden doors or PVCu doors. Step-by-step instructions with pictures on fitting a letterbox. Video Tutorial on fitting a letterbox into a timber door.

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Fitting a letter box is not the easiest of DIY tasks but approached with care it can be done in both wooden doors and PVCu doors alike. The biggest problem with fitting a letter box is the fear you face when cutting a huge hole in your door! Remember Diydoctor's tip, measure twice, cut once, follow our instructions for fitting a letter box and you wont go far wrong.

If you have not yet selected your new letter box or are looking to purchase a new door, there are many differing styles and finishes available, and some of these can be seen in our tools area at the base of this page or from your local DIY store.

As you can see from the below images we are fitting an industrial office letter box for the purposes of this how to tutorial as this makes it a little easier to see how it's fitted.

Industrial letter box

Industrial letter box

Letter box opening

Letter box opening

This box opens inwards so the flap pushes into the hole you will need to cut in the door, making it even more important to cut the hole accurately.

Mark the hole a couple of mm larger than the opening required to push the flap into. Use a spirit level to get the letter box absolutely level.

Drill 4 holes large enough to get a jig saw blade into. The edge of the holes should be touching both lines near each corner. Make sure you keep the drill level in your hand.

Mark opening for letter box

Mark opening for letter box

Drilling  holes in hardwood door

Drilling holes in hardwood door

Holes ready for jigsaw

Holes ready for jigsaw

Use a jigsaw very carefully to cut along the lines you have marked. Don't hurry, let the saw do the work and don't push it too hard.

Using jig saw to cut opening for letter box

Using jig saw to cut opening for letter box

Hole ready to insert letter box

Hole ready to insert letter box

Cut the hole inside the lines and when you have pushed the middle out use a wood rasp to tidy up the hole. Cutting straight lines with a jigsaw is just about the hardest thing to do in woodwork! Screw in the threaded studs provided with the kit to the back of the plate. Once you have cut your hole and tidied up the edges with a rasp, place the letter plate with the studs in place to make sure that the hole is big enough and everything lines up correctly.

Try letter plate in hole to get size correct

Try letter plate in hole to get size correct

Using a mallet or a hammer with some cloth over the face to avoid damaging the letter plate, tap the plate at each corner where the studs are. This will make a small mark in the door to enable you to accurately drill the holes for the studs to go through.

Push letter plate bolts through holes in door

Push letter plate bolts through holes in door

Close up of letter box bolt holes through door

Close up of letter box bolt holes through door

Drill the holes for the studs and then push each stud through until the letter plate is right up against the face of the door.

Using a cordless drill to drill letter box bolt holes

Using a cordless drill to drill letter box bolt holes

Tighten the correct size nuts and cut off any excess thread with a hack saw. Easy wasn't it !?

Letter box bolts tightened in inside of door

Letter box bolts tightened in inside of door

If you would like further information on using a jigsaw why not go to our video section on using a jig saw to watch a film on how to use this useful power tool correctly.

Don't fancy doing this project yourself? We work with Checkatrade to ensure that we recommend only reliable and trustworthy tradesmen.

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