When adding door architrave to a standard door size you need 2 upright legs which usually measures at 2440mm and 1 head at 1220mm. However, this will depend on what size door you have, to be sure you will need to measure by holding the architrave length against the left hand side of the door using the margins as a guide. Where the margin at the top of the door meets the piece you’re holding is where you mark the architrave.
At Howarth Timber and Building Supplies we offer a range of different size architrave to suit your needs. Ranging from thicknesses 15mm architrave, 18mm, 19mm and 25mm. The architrave lengths are ranging from 2400mm (2.4m) lengths, 4400mm (4.4m lengths), or 5400mm (5.4m lengths) giving you more freedom when cutting to the size of door architrave you need