Typically called baseboards in the United States, skirting boards are the trim or moulding boards that run along your floor against the wall. The term "skirting board" is usually used in the United Kingdom. Skirting boards come in a variety of styles, from simple to elaborate, but no matter the style, you cut the boards the same way. Cut skirting boards upright in a mitre box, the way the board would fit against the wall, instead of laying them flat as you would with crown moulding.
Measure the length of the first wall.
Place a piece of skirting board or moulding longer than the length in your mitre box. The back of the board should lean against the side of the box. Set the box to the 45-degree angle position.
Cut the board to length. Cut the end of the moulding that will make the corner at a 45-degree angle using a circular saw.
Repeat the process for the adjoining wall.
Measure the length of the wall.
Cut the first board to length with a circular saw. The end of the board should fit flush against the wall.
Measure the second wall from corner to corner. Cut a skirting board to length.
Turn the board over. Place a scrap piece of your skirting board flush against the back of the board, so you can outline the design on the front of the moulding on the back of the board. Make sure the back of the scrap piece is even with the end of the longer piece of skirting board.
Use a pencil to trace the design of the face of the moulding onto the back of the skirting board. Use a coping saw to cut the board where you traced.
After making your cuts, always try to fit the two boards together before adhering the boards to the wall. If you need to fix an error, it's better to discover it before the board is installed.
Wear safety goggles when using power tools.