How large of a duck/goose house?

Ours would need the size of a match box . They never go inside the houses except to lay. A few years back we had hurricaine Floyd pass just about right over us, we live on high ground but it was raining so hard and fast there was about 12 inches of water on the ground. I looked out the back window of the house and there was all our Muscovies out in the middle of it all. They were swimming and bathing having a great time.

Steve in NC

 

My ducks very rarely go in their dog house shelter either.

 

I have 4 ducks and 1 goose, and they all sleep in a 3 1/2 x 4 x 4 locking little shed.. like a regular shed only really, really small. I don't know how this sounds to everyone else, maybe like overcrowding, but they are only in it in the dark time, and I need it to be small so everyone stays real warm. they have the whole world to roam during the day, and I really need them to be secure and warm at night here in vt. Lots of shavings, some straw, well insulated and wrapped.