What is the greenhouse frame made of? Aluminum will provide the best longevity and the heavier gauge of aluminum, the better. A heavier greenhouse will withstand wind and snow substantially better. A wood framed greenhouse will expand and contract over time, letting in pests and cold air. A wood frame will also require staining and maintenance every year.
Do you have size options for doors? Is the door heavy duty? Does it lock or offer extra ventilation? Can you upgrade to a commercial door for a thermally improved option?
Are any steps taken to ensure the greenhouse does not have gaps to prevent hot or cold air from escaping? Is there weather stripping, sealants and silicone provided? Are there frame clips that can easily break?
Is the glazing high quality? Tempered glass is a basic requirement for safety. Is the polycarbonate UV protected to avoid yellowing over time? Do you have the option to mix and match glazing for the best climate control?
Can you change the greenhouse to suit your needs? A well-loved greenhouse comes down to the details. Changing the sidewall height or where the door can be a gamechanger depending on your yard. Buying a greenhouse “off the shelf” typically means you must find creative ways to make it work for you. Can you extend the greenhouse at a later date if you move? This is a great option that ensures the greenhouse maintains its value to you or if you decide you want more growing space in the future.
What are the wind and snow load minimums? Can you modify the greenhouse to increase the loads? It’s important to think about the interior too. Can you hang heavy baskets, shelves, or light fixtures from the roof bars? Staging the greenhouse the way you want it will help you enjoy it for many years to come.
Make sure the company stands behind their product. At minimum you should expect a lifetime warranty on the frame of your greenhouse. Ask about weather related warranties like hail too. Quality greenhouse companies will provide more peace of mind.
Everyone understands the value of great service. Check online reviews. Talk to past customers. Companies should be transparent and provide this information to you.
It's the best way to get started on the journey to your new greenhouse!