Some plants and herbs cannot be put outside but do need a sunny location inside the house. A three or four shelved storage unit, depending on the size of the window will make full use of the window. White pinewood would be recommended for this project. Measure the inside of your window first. This will give you an idea of how much timber to order.

Cut the two sides and shelves to the length that will fit the window. Remember to allow about a centimetre clearance on either side of the unit. Therefore when cutting the shelves, take into account the thickness of the side pieces as well as the centimetre clearance. Measure the side pieces and use a pencil to mark off where the shelves should be positioned evenly.

Now form a rectangular box by positioning a shelf at the top and bottom of the sides. Fasten them into place using two inch cabinet screws, and then screw a metal corner support onto each corner of the box.

Put the remaining boards on the pencil lines you made earlier and use wood screws to fasten them into place. As an alternative you could create more versatile storage space simply using shelf supports making them adjustable by drilling into the sides at even distances so that the supports can be plugged into them when necessary.

To avoid the danger of the unit toppling over, use a hook and eye attachment secured to both sides, at the top and back edge of the unit.