I have 2 cold frames, one is 16' x 24' and the other is 16' x 36'. The 16' x 24' is attached to a 300 sqft shop. I use the shop area as a shaded growing space. I keep my offsets in there as well as other plants that don't do well in the sun. And that is also where I do all my potting up.
The 16' x 36' has not been put up yet but I hope to set that up early this year.