Outsunny 8x16 Polycarbonate Walk-In Greenhouse review

The Outsunny 8x16 gives you 131 sq ft for $595.99 at Aosom on November 12, 2026: about $4.54 per square foot, by far the lowest on our list. It has 4 mm polycarbonate, an aluminum frame on a galvanized steel base with foot stakes, two windows and gutters. The catch is that Aosom publishes no snow rating, no wind rating and no warranty term, which is why it ranks near the bottom.

Nothing else on our list comes close on price per square foot. At $595.99 (Aosom's sale price against $677.99 on November 12, 2026) you get an 8 by 16.4 ft walk-in greenhouse, 131 sq ft, with 4 mm polycarbonate (0.16 in), an aluminum alloy frame on a galvanized steel base, slant brace tubes, foot stakes, two adjustable windows and gutters. That is room for beds down both sides and a path.

Aosom does not publish a snow load, a wind rating or a warranty term for this model. We do not guess, and our formula scores unpublished criteria low on purpose. A long, light aluminum structure catches wind, so pick a sheltered spot, use the stakes and add ground anchors. Clear snow before it builds up.

The peak is 85.2 in (7 ft 1 in) and the eaves 52.8 in. The sliding door is 1.6 ft wide by 5.6 ft high, so a wheelbarrow will not fit; plan to carry soil in. Two five-level adjustable windows (2 by 1.7 ft) give cross-ventilation.

A cheap greenhouse lasts as long as you look after it. Build it on a level, staked timber frame or pavers rather than bare lawn, and add ground anchors on top of the supplied foot stakes. Check the panel clips after the first windy week, because a loose panel is how damage starts. Close both windows and the door when a storm is forecast, and brush snow off the roof before it piles up. In a hot July, open both windows and add shade cloth. Treat it that way and it is a lot of greenhouse for the money; if you want published ratings instead, the YourGreenhouses Polycarbonate is the step up.

Aosom ships it and offers 30-day returns; return shipping may be charged on non-warranty returns. Assembly is DIY with a published manual. For a summer vegetable house on a budget, it is hard to beat; for a winter greenhouse, look elsewhere.

$595.99 at Aosom on November 12, 2026 (Aosom product page (Outsunny is Aosom's outdoor brand)). Sale price against $677.99 listed on Aosom.

Ships from Aosom; 30-day returns, return shipping may be charged on non-warranty returns. No warranty term is stated on the page we read.

Head-to-heads: YourGreenhouses Polycarbonate vs Outsunny 8x16.

Rankings with this kit: best greenhouse kits, best polycarbonate greenhouse kits, best walk-in greenhouse kits, best large greenhouse kits (100 sq ft and up), best greenhouse kits for winter and snow, best greenhouse kits under $2,000.