My husband built my greenhouse years ago - added on to our pump house when I asked him to put something on the side of it for me to start plants in. He's pretty talented and he really went with it! I used to start my tomatoes and peppers in February, but since we've retired, we travel in the winter, so I don't usually get things going until March or April anymore. I bought some big trays so I can use wicking fabric to bottom water and we put shade cloth on the windows when it starts getting too hot.
This photo was taken a year or so after it was built over 15 years ago ago - it looks a bit more weathered and 'lived-in' now. We also added a storage room for garden tools and stuff. The other photo is the old pump house we started with. I love my greenhouse.