Hi. Can anyone please advise if its possible to make a hollow house out of fondant? The idea is to have a 3 tier cake either topsy/spiral (undecided!) and then a small 10 x 10 cm house c/w roof at the top. Any advice will be most appreciated. Thanks in advance.

not easy to do in fondant, in gumpaste, definately. fondant doesnt dry as hard as fast as gumpaste, and it also isnt as strong.
xx

Thanks - any advice on how best to use it? ie do I just roll/make it & stand it up, or do I need to add anything to it or if so, how long do I wait before it goes hard?

just roll your gumpaste, and cut the shapes that you need. leave them to dry. then stick them together, id use edible glue, or royal icing. and i would support it while it dried.
maybe join two walls at a time, let dry, then join to the other set. then add the roof.
as for how long for it to dry hard, it depeneds. gumpaste dries very quickly (have you used it before? you will need to work very fast! maybe just roll one wall at a time). things like heat and humidity, and which brand/ recipe you use will make a differerence. the size and thickness of the panels would affect it too. but as gumpaste will last forever, i would start now, that way its not so much of a problem!
xx

If making things like that i like to use an inside support, perhaps a cardboard box, I prefer to attach the gumpaste to the box, rather than have it standing on its own, much safer

Very helpful - thank you both for your replies. xx

What about making the house out of cookies?? Like a gingerbread house?

I would suggest that pastiage might be better for this than gumpaste.