What a great addition to our house and garden. I use it as my home office so plan on using it all year round. With this in mind i paid extra for floor and roof insulation, double glazing and the thicker floor and roof. i am happy that a small heater in there will be enough. I easily get a sofa, desk and office things in it. I paid a local electrician to install power and broadband so i am all set! The installation: this is where i made the mistake.. I was put off by the seemingly high price to get Dunster to install it. On hindsight i wish i had used them. I employed a local company who "had done these all the time"...and that it where it went wrong! The installation was a shambles but thankfully my father inlaw (retired chippy) rescued it. Think hard about getting the right people to install it. I could have done it myself but time was my issue. Customer service from Dunster: excellent. I took back a few things as they were not needed - the rapid pads were not required as i ended up putting down a concrete base. they refunded no problem. Would i buy again? YES! great asset and worth it.