Adding or altering a letterbox in a wooden door is a skilled job that should be undertaken by a carpenter or joiner. They will first need to measure up the letterbox and decide upon the size of the hole needed. They will then cut the hole out and tidy it up before fitting the letterbox and any surrounds, insulation or internal extras such as a wire basket for the letters to fall into.
If your letterbox needs repairs then this will usually be because the screws have come loose, a spring mechanism is damaged or the insulation has come away. Your professional should be able to deal with these simple repairs in a short space of time and reposition, repair or replace your letterbox at a low cost.
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