Shed/Guesthouse Cost?

banie01

I'm considering building a large Shed/Mancave and I'm just wondering what the approximate cost would be for the following?
Ideally I would like to build a good quality insulated ''Shed'' that would actually be more akin to a Studio apartment in terms of size/use.
With that in mind I envision an @12' x 20' building with a pitched roof.
I'd hope to install a small bathroom/shower aswell.
THe main Idea would be that this would be a space for me to keep my bits and also to double up as a social space and a little guesthouse for when friends from abroad visit.

I have in mind that the work involved will include pouring the foundation slab, services(Waste and Water hookup), Cavity Wall construction/Insulation, along with a decent internal plaster finish.
I have earmarked a double width sliding door and some windows that I have spare for use on the project but I am just wondering what kind of ballpark budget I could get this done for?
Assuming using contract labour?
Thanks in advance folks.

bombadil

Based on experience of just finishing a similar project 10 to 12,000 should get you most of the way... will obviously depend on what part of the country you are in

thesteve

Saw one of these outside Jones Garden Centre in Donabate for ~10k
http://www.coppolacabins.ie/dalkey_d