Attached greenhouses normally require a building permit because they are considered an addition to the home and not an accessory building. As far as building codes go, attached greenhouses are typically treated similarly to the addition of a sunroom. ... In most cases, a greenhouse is welcomed by the community.

Is a greenhouse considered a permanent structure?

Most states don't consider hobby greenhouses to be permanent structures, so in that case building permits are not required. However, there are particular cities and states in which your plans must first be approved before building can begin (this is especially true if you plan on laying any kind of foundation.)

Can I build a greenhouse in my backyard?

In most cases, you can build a greenhouse on your property without anyone's permission. Some municipalities, however, have strict regulations on permanent structures and it may require you to fill out forms (with filing fees) or apply for licenses or permits. Look into any and all local rules.