glass greenhouse wooden frame and plants

When you’re trying to find out which greenhouse suits you and your needs, size is an important factor to take into account. As soon as you get into greenhousing and start planting, you will be surprised how quickly you reach the limits of your greenhouse. It’s also a fact that the larger the greenhouse, the less temperature fluctuations. One of the options is to start with a budget greenhouse that can be expanded later on as some greenhouses offer the opportunity to extend at the back. If you think this might be an option for you, make sure you keep enough room at the back of your greenhouse.

Standard sizes for greenhouses

There’s no real standard size for greenhouses, although in general most hobby greenhouses are 8 to 10 feet wide. The bigger hobby greenhouses can go all the way up to 20 feet. For a hobby greenhouse I would say that 20 feet width is about the maximum for a large greenhouse, as soon as you start going even bigger you’ll probably need a commercial greenhouse as a hobby model won’t be easy to find.

The next factor to consider is the height of the greenhouse. Usually a height of 5 feet is sufficient for placing some side benches and low-growing plants. If you want to grow taller plants, you will need a height of 7 or 8 feet to make sure you don’t reach the limits of your greenhouse too quickly. Take into account that hot rises, so the higher your greenhouse, the more heat it will need. When you have tall plants growing this is definitely an advantage, when you’re however only using your greenhouse for low-growing plants it’s best to go for a 5 feet height as a higher model will cost you more in heating during winter due to the bigger volume that needs to be heated.

The best size for your greenhouse?

When you enjoy planting and rooting in the soil, it’s nice to have some space to move around. If you have to spend hours on your knees, the joy might fade quickly and you might lose your motivation to grow homemade vegetables. When you’re planting seeds or small plants, take into account that (hopefully) they will grow and need more room than they do in the beginning. If you want to be able to reach the other side of your greenhouse without feeling like you’re in the jungle and needing an axe to advance, make sure you give your plants plenty of room to grow and evolve!

Buying a bigger greenhouse has some other implications too. The price of your greenhouse will most likely be higher when you buy a bigger greenhouse and you need to make sure there’s enough space in your backyard (and you’re willing to sacrifice it). Discover which type of greenhouse will suit your budget!

Greenhouse sizes can roughly be divided into three categories:

  • Small
  • Medium
  • Large

Small greenhouses

There’s no fixed benchmark on the size of a small greenhouse, but the most popular hobby greenhouse size is 6×8 ft. Even though we classify this as small, it still gives you plenty of space to move around and the opportunity to have a good amount of plants and vegetables in it.

While a 6×8 greenhouse will give you the opportunity to dive into the greenhouse world, you may not be ready for a larger investment and prefer a smaller model. In that case you can go for a 2×4 greenhouse. It’s small but it will still give you the opportunity to grow some vegetables and discover the joys of a greenhouse. When you have very limited space or no outside room, the perfect option for you can be a mini greenhouse. It’s cute, fun and it will grow you one or two plants or some yummie fresh herbs and spices. Maybe this could be your first try with greenhouses or maybe you want to know whether or not you really like it before investing in a large greenhouse for your yard. Take a look at our indoor greenhouse article if you don’t have a backyard and still want to see what greenhouse options are out there for you!

Best 6×8 greenhouses

outsunny polycarbonate portable walk-in garden greenhouse 6x8x7Outsunny 6' x 8' x 7' Polycarbonate Portable Walk-in Garden GreenhouseCheck price
palram hg5508 hybrid greenhouse 6x8x7 silverPalram HG5508 Hybrid Greenhouse, 6' x 8' x 7' SilverCheck price
palram nature series mythos hobby greenhouse 6x8x7 silverPalram Nature Series Mythos Hobby Greenhouse - 6' x 8' x 7' SilverCheck price

Best mini greenhouses

flower house fhcv900 conservatory greenhouse clearBest Choice Products 4 Tier Mini Green House, 27" x 18" x 63"Check price
abba patio 8x10 feet large walk-in fully enclosed garden greenhouse with windows in whiteIkea Greenhouse, Indoor/outdoor, WhiteCheck price

Best medium greenhouses

The standard medium greenhouse size is 8×12. Medium greenhouses will give you the opportunity to go semi professional and grow a wide range of fruits, vegetables and plants. It’s perfect if you have time to invest in your greenhouse and you’re willing to spend a little more. It will give you the freedom to start small and gradually expand (or dive in head first and go all the way from the start, of course)!

rion medium gardener 2 clear greenhouse 8x12Rion Grand Gardener 2 Clear Greenhouse, 8' x 12'Check price
nw green medium outdoor greenhouse 8x8 cedar wood polycarbonateNW Green Panels Large Walk-in Greenhouse, 8' x 8' Outdoor Gardening Organic Cedar Greenhouse, with All Wood and 8mm pollycabonate framing with Dutch DoorCheck price

Best large greenhouses

If you want to do more serious greenhousing, a 10 ft wide greenhouse or larger is the choice for you. The main difference with a medium-sized greenhouse is usually the width that enables you to make maximum use of the entire space. The length can vary between 16 and 24 ft. The options on these greenhouses are widely varied; for example, an internal partition with door so you have two separate growing areas, which gives you the opportunity to play around with temperatures and plant certain crops in the warmer area (such as tomatoes) and plant other vegetables in the cooler areas.

Rion Grand Gardener 2 Clear Large Greenhouse 8' x 16'Check price
delta canopies large heavy-duty greenhouse walk-in 20x10DELTA Canopies Large Heavy-Duty Greenhouse 20' x 10'Check price
palram hg5616 glory greenhouse 8x16Palram HG5616 Glory Greenhouse 8' x 16'Check price

The sky is the limit and if you want to go really professional, you can install greenhouses that are up to 20 ft wide. For the regular hobby greenhouse, this might be too big, but if you want to go all out, or you’re an experienced greenhouser, there’s no need to stop there. The most important thing is that you feel comfortable with the size of your greenhouse.