BILLY white stained oak veneer, Bookcase with height extension unit, 40x28x237 cm - IKEA
Ikea Library Wall Built In Hack
BILLY black-brown, Height extension unit, 80x28x35 cm - IKEA
How I Created My Ikea Billy Bookcase Shelving Hack — MELANIE LISSACK INTERIORS
Billy Bookcase, Easy to Assemble – Between Naps on the Porch
IKEA hack - billy bookcase built in | Ikea built in, Murphy bed ikea, Bookcase
BILLY white, Height extension unit, 80x28x35 cm - IKEA
Why would there be an extension option for the tall BILLY but not the short one? I bought the extension in the clearance section, already assembled, so no hardware came with it.
BILLY Bookcase combination/hght extension, black-brown, 120x28x237 cm - IKEA