Hi - we spent 12-months living on the hard in Lymington, UK, for our major re-fit. It's easily do-able and lets you work long into the night on interior
projects (if you want to).
Pee bottle saves lots of walking, especially thru snow at 3am. Most loos ashore usually have sinks and showers too.
We bought a small microwave for simplw cooking
or re-heating food
and making hot water. Didn't need a refridgerator during the winter as it was cold enough that milk and juices kept without spoiling by just storing them outside the companionway
heater will keep the boat warm. An electric
blanket is really wonderful to have! Turn it on 1/2-hour before crawling under the covers at night - it's heaven!
Really tie off your ladder so it doesn't go walk-about. If you are out for a year, you may want to spend a couple of days and make a substainal set of stairs going up to the boat. You can enclose the underneath portion of the stairs and have a mini-storeroom for tools and supplies.
If it gets incredibly cold or you have to do some horrid inside job (fiberglassing/painting) you can get a room for a couple of nights ashore. Also lets you do laundry
and major scrub job on your body so you can get squeaky clean or at least remove the first couple of layers of boatgrime.
Sometimes you can rent a small flat for not much money
and have the advantage of a "home base" with funtional kitchen, lots of hot water, toilet, etc. We rented one for 2-months when it was freezing cold (2-ft of snow on the ground) yet still could go to the boat and work each day because we left the flat warm, well rested and with a meal in us.