Do you want to build a greenhouse, but do not have enough room for a stand-alone one out in the middle of the yard?
Then the lean-to greenhouses might be what you are looking for.
You must consider that with this type of structure you will not have the same space as with a freestanding one.
However, when you want a small greenhouse and do not have a lot of yard space this will fit your needs just fine. Remember, this is about half the size of a full one and sometimes not even that.
Do you have some space on an outside wall that has a door in it also?
The main advantage to the lean-to greenhouse models is that they will be near electrical connections and a water source. You will not have to make special provisions for these things. Just make a connection for the lights, heaters (if needed) and water into the main electrical or water pipes of the house.
Another benefit to this type of structure is it takes up less space. Even if you have a good-sized yard, you might not want to take the space up with a full-sized greenhouse. If you are just dabbling with a few plants, why have more space then you really need.
It is harder to have the right ventilation in the lean to greenhouse. The walls are needed for support so not as much can be done compared to a full-size one.
Since it is not as large, it may not get as much sun. But this is part of what you need to analyze when selecting a location.
The biggest disadvantage though, is the limited space.
After you have constructed your lean-to greenhouse then you have to accessorize it.