Start by judging the width of the panel. Use a length of the pine moulding as a rough visual – we used a wide profile for the outer panel. Use a mitre tool to cut the 45% angle on each end of the panel piece.

Before securing each piece in place, draw a level line using a spirit level. Then match the panel piece up to the line. Glue each panel piece in place using the adhesive then nail to the wall to secure. Start with the horizontal side first and then individually measure each side from this one piece.

Once you have a full square with the wider moulding, you can measure in from the outer moulding, making a gap where you want the inner panel to start. Draw all around the inside of the outer panel so you know exactly where the thinner panel will match up to. Use a spirit level to make sure the line is exactly parallel all the way around.

Starting with the bottom horizontal piece and work your way around. Once you have the double panel complete, you can start to prep for painting. Use a small hammer to tap in any nails that are sticking out and seal any knots in the wood with a knot sealer.

Using a sealant gun, caulk around the panel edges to create a seamless join to the wall. Don’t worry if it looks messy, you can use a tool or your finger to smooth it out! Once it is dry, you can sand any lumps and bumps down. Wipe down all surfaces with a damp cloth, ready to prime and then paint. A slightly darker paint colour than the wall will highlight the panel detail. If you are adding light fittings, mark, drill and plug the wall before wallpapering. You can check the panelling is straight by using a plumb bob weight. Mark a straight line using the plum bob at the exact edge and width of the wallpaper.

Fill a paint tray with wallpaper paste and use a roller and cutting brush to apply it to the wall. A roller is great for larger areas and a cutting brush is good to get the paste right up to the panel edge.

Hang the first run of paper from the top down. Use a large sponge to smooth the wallpaper over the wall, making sure there are no bubbles. To finish on the bottom edge, run a felt covered squeegee along the panel edge, making a straight crease line in the wallpaper. Cut the excess paper using a sharp scalpel blade. Trim the top of the wallpaper in the same way if necessary and work your way across the panel.

With the final drop of wallpaper, apply the wallpaper paste and hang the paper in the same way, except this time you need to trim to the excess on the side as well as the top and bottom edge. Add your light fittings, sit back and admire your handiwork!