Project Overview

Learn how to easily install an architrave around a window frame. We’ll show you how to measure and cut the architraves, cut the mitre ends and how to attach the architraves to the window. Just follow our easy step-by-step guide.
Continue to Step-by-step instructions.

Step by Step Instructions

1 Measure the bottom architrave
2 Cut the architrave board
3 Attach the architrave to the window
4 Measure the sides
5 Cut the side architraves to length
6 Attach the side architraves
  • Step 1. Measure the bottom architrave

    First thing you need to do is measure the inside of the window reveal and add 5mm. The reveal length is measured from inside mitre point to inside mitre point. Transfer these measurements to your architrave timber.

  • Step 2. Cut the architrave board

    Use the mitre box to cut a 45 degree angle on the end of one of the architrave boards. Measure along and cut an opposite 45 degree mitre on the other end of the architrave. 

  • Step 3. Attach the architrave to the window

    Place the bottom architrave on the wall. Place it 2.5mm down from the reveal. Check it is level.  Use a dummy piece at the corner with a 45 degree angle to help position the architrave. Then nail it into place. 

    Repeat the process for the top architrave to mirror the bottom. Nail that into place using a dummy plate to check the position.  

  • Step 4. Measure the sides

    Measure the sides from long point to long point of the top and bottom architraves. It’s important to measure both sides of the architraves because their lengths could vary.

  • Step 5. Cut the side architraves to length

    Transfer your measurements and cut the side architraves to length. Remember to cut 45 degree angles at each end. 

  • Step 6. Attach the side architraves

    Slot one architrave between the top and bottom architraves to make sure it fits. Take the side architrave and add some PVA glue to the corners. Then slot the architrave in again and nail it into place. 

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions which came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings team member.

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