How to Secure a Wrought Iron Window Box to a House

Locate the studs on the wall beneath the window with a stud finder and mark their spots with a pencil. The studs provide the most support, so this is where you'll install the bolts.

Draw a straight, level horizontal line with a pencil where you'll install the window box. This can be wherever you prefer, but leave enough room between the top of the box and the window ledge to remove liners or perform regular maintenance.

Position the cage below the window, following the line as a guide. Mark the holes in the back of the cage, as well as the opening between the double iron strap, if your box has one. If it doesn't, you can drill holes through the back of the iron cage to create more as needed.

Drill additional holes in wrought iron boxes without a double iron strap for extra support, using a high-quality drill and titanium or cobalt drill bits. Use cutting oil on the bit and iron to lubricate it and prevent dulling. Start with a 1/8-inch pilot hole, and then drill with a 1/4-inch bit for all types of siding except stone, brick or block. For those, start with 1/4-inch bit and work up to 1/2-inch and 3/8-inch bits. Position the box where you'll install it and mark the additional holes with a pencil.

Drill pilot 1/8-inch pilot holes on the siding in the areas you marked with the pencil. For brick, block or stone, drill 1/2-inch pilot holes and insert 3/8-inch lag shields into the holes. Hammer them into the wall.

Position the box in the installation position. Bolt 1/4-inch lag bolts into the wall with a socket wrench to hold the box in place. Avoid over-tightening the screws.