Oops!, Came looking for the post after realising but you beat me to it
Cheers for all the responses. Don't worry it's not my garage and as Zed already has to sit out in the cold.
Planning permission is all sorted. The garage is being converted to a treatment room for a medical condition. We usually install a portacabin, that fits the bill, but this time that is not feasible. As far as I am aware, the existing garage is brick built, single skinned with a concrete floor and garage door. It will need an electric heater (no central heating required), and require plumbing and drainage. Sink with cold and hot water (supplied from electric boiler). WC is not required. It will need a window fitting. I’m not sure what roof it has but I guess it will be remaining flat if that's how it is at the moment. Located in the garden of the property roughly 20ft away. SIze mmmm, not being much help here am I? I'm not involved directly with the install so I'm working with 3rd hand info. Standard single car garage size?
We have a quote of 19k! Suprised me but it may just be to going rate as it's been a while
Cheers