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A window sill shelf gives you more room for plants and decorations--and, of course, cats! This short video from The Honest Carpenter will show you how to build and install your own window sill shelf extension with a minimum of material and labor. This is a perfect cat shelf / plant shelf! Give your cat a place to perch :)

Typical window sills (or "stools") are only 3-5" deep. This window sill shelf extension is 9" deep, about the depth of your average book shelf.

Tool List:
Tape Measure
Circular Saw OR Jigsaw Or Coping Saw
Drill
Router (optional)

Material List:
1x10 pre-primed pine
3" screws
Caulk
Liquid Nails
Primer/Paint

Cat Shelf / Plant Shelf / Window Sill Shelf Extension How-To:

1) Measure existing window sill. Add 1" to each end for overhang.
2) Mark center of existing sill
3) Cut pre-prime stock to desired measurement with circular saw or jig saw.
4) Mark center of window sill shelf extension piece.
5) Bring piece inside and mark notches for mullions or separations.
6) Measure depth of window bays. Note measurements on board.
7) Plot and cut notches for mullions and separations.
8) If necessary, cut out lower ends of window side casings
9) Slide window sill shelf extension into place. If necessary, cut to make piece fit more tightly.
10) Spread liquid nails in zig-zag pattern on existing window sill. Press new window sill shelf firmly down into place.
11) Pre-drill and countersink screw locations at center of window bays. Drive screws through window sill shelf and original sill, into rough opening framing.
12) Tape, caulk, prime and paint
13) Introduce your cats to the cat shelf / plants to the plant shelf!

That's how you build a window sill cat shelf / plant shelf extension! If you have any questions, feel free to put them down in the comments section.

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