Short history, I've built a cat ledge with a board I found in the refuse room, but it had failed and grew unpleasant mold (ick!) that we junked it.
But the cats really enjoyed the ledge, so I decided to spend some money to build a reasonable priced one. It's technically a shelf by the window, that you use cats as the main decoration ;-)
IKEA FABIAN shelves: RM 15.90
IKEA HALL bracketts: 2 x RM 9.90 = RM 19.80
Screws and dowells for the walls and board. Be sure you have a suitable "anchor" if you're installing unto drywall/stud.
1 Liter can of Dulux black Satinwood: Free, my brother is letting me use some after his other DIY project here
(I'm real proud he's managed to refurbish an old office table we gave him. Though it's compacted particle board, it's still usable. I like the glossy finish he did.)
2 Liter King Cobra thinner: RM 20 (leftover from my many oil-based paint projects
a random plastic container: free
an unused mug: free
Paint Brush: RM 1 (bought from 100% discount store in Kuching)
Electrical power drill and drill bit
Firstly, I painted 3 coats of paint on the FABIAN untreated soft pine plank. Pretty straight forward painting, while waiting around 1-half hour for each coating to dry. Confirmed that it's NOT worth it to save a few bucks to skimp on paint brands. First attempt to repaint my dining table with a cheapo white glossy paint didn't work out so well. For months, I still get some paint sticking to my things. I have repainted my table with Nippon Odourless (white) matt paint, and no problems since. It's oil based but dries a lot quicker than glossy paint, even on some of the heavy drip part.
Anyway, because the brackets that comes with the FABIAN shelves are not tough enough to take the impact of the cats jumping from the high shelves in the laundry room, I thought the HALL brackets (made out of cast iron bars) should be sufficient.
The cats didn't like it for the first few months actually because it's painted. Now they don't mind it so much.