The board is

First we determine the desired size of the future windowsill. According to measurements, carefully cut the board. Next, attach the brackets. This work requires accuracy and accuracy. Brackets are attached from below the existing window sill. Since the main load will be supplied to them, the brackets should be strengthened at least three screws. Then we attach the prepared board to them. As soon as the board is securely fixed, it is necessary to paint it in the color of the window sill, and if desired, it is completely repainted by the entire structure. After that we get rid of the garbage received during the work and enjoy an improved windowsill.