At my previous home, I had a large 80 foot garden and installed a "Home Office" there. It worked quite well for me ast it had a great view of the garden, internet access, electricty and heat and even a burgular alarm. The beauty of working in it was that I could lock the door at the end of the day. As it was out in the garden, it stopped me working late at night.

Sadly, now that I have a study in the house, I tend to work all hours!