[Tom]

How to make a simple window Box / planter box

Cut a 1 inch thick plank into the required pieces:
Two pieces the same size for the front and back.
These lengths should match the window width .
Two pieces the same size for the sides.
The size of these should reflect the width and depth you choose.
One piece for the bottom.
This piece should be the same length as the front and back, and two inches wider than the sides.
Next, pre-drill guide holes in the front and back pieces at each end.
Repeat on the bottom piece but drill an additional one-inch hole in the middle to allow for drainage.
Now, glue the front and back pieces to the sides - be certain the correct sides are exposed outward. Waterproof wood glue works well.
Then, using the pre-drilled holes as guides, screw the front and back pieces to the sides with 1-1/3-inch galvanized screws.
These screws will provide ample stability and not react with the natural preservatives within the western red cedar.

Lastly, glue the bottom piece to the bottom of your window box and screw that into place as well. Then sand, prime and paint the window
Mounting
Many mounting options are acceptable. For windows extended to or near the ground, simply place the window box under the window for a nice touch.
For higher windows, begin the mounting process by drilling two 1/2-inch-diameter holes in the back of the cedar window box, approximately a quarter-way in from each end and 1-1/2-inch below the top edge.
Holding the cedar window box in position under the window, hammer a 3/8-inch hanger bolt through each hole onto the house siding enough to make an indentation or mark.
Next, remove the window box and drill two 1/2-inch pilot holes at the indentation marks.
When installing the hanger bolts, allow two inches of each bolt to protrude from the house.
Hang the window box on the hanger bolts and screw a 3/8-inch washer and nut on the end of each bolt.