The most common mistake in buying a greenhouse isn't buying the wrong model. It's buying one that's too small, realising it a season later, and paying twice.
What fits in an 8'x8'
Sixty-four square feet sounds like a lot until you stand in it. Once you allow a walking path down the middle, you're working with roughly two beds about three feet wide.
That's genuinely enough for: starting all your own bedding plants each spring, six to eight tomato plants, a herb bed, and salad greens through the shoulder seasons. For most home gardeners feeding one household, an 8'x8' does the job.
Where it runs out: anything you want to grow at scale, tall indeterminate tomatoes plus a bench plus storage, or two people working in there at once.
What fits in a 10'x16'
One hundred and sixty square feet — two and a half times the floor. That changes what's possible rather than just adding room. You can run beds down both sides with a proper working aisle, keep a bench permanently in place, and still walk past someone.
This is the size if you're growing to preserve or sell, if you want to overwinter plants, or if more than one person gardens.
The honest test
Mark it out on the ground with stakes and string before you order. Stand in it. Walk the path you'd walk. Most people who do this exercise upgrade — and the ones who don't were right to stay small.
One thing people forget
In BC, structures under 108 square feet are exempt from a building permit in most municipalities. The 8'x8' sits under that at 64 sq ft. The 10'x16' at 160 sq ft is above it and typically requires a permit. That's not a reason to buy the smaller one — but it is a step to plan for.
Both sizes are available in either model, delivered fully assembled.
