Bramble & Coop
A lean-to greenhouse shares one wall with your house, garage or shed. That wall stores daytime heat and gives some back at night, which is why lean-tos often stay warmer than freestanding greenhouses of the same size.
Pick the right wall
A south-facing wall is ideal, southeast or southwest is fine. Watch for roof overhangs that shade the space and for snow sliding off the roof above.
Sizes that fit small yards
- A shallow 2 to 3 foot deep shelf greenhouse for seedlings
- A walk-in 6 by 8 foot lean-to for tomatoes and winter greens
- A clear cold frame attached to the wall for low crops
Glazing choices
- Twin-wall polycarbonate: light, strong, insulates better than glass
- Glass: beautiful and long lasting, but heavy and more fragile
- Greenhouse film: cheapest, replace every few years
A printed and digital project book about running a small homestead on a quarter acre or less: greenhouse, mini coop, garden layouts and many more step-by-step builds with photos and sketches.
See what is inside the bookAffiliate link. Sold through Digistore24; check the current price and refund terms on the order page. Results depend on your yard, climate and effort.Keep it from cooking
Small greenhouses overheat fast on sunny days. Plan a roof vent and a low vent so hot air can rise out, and add a door you can prop open. An automatic vent opener costs little and needs no electricity.
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Store heat
Dark barrels of water, stone or brick along the back wall soak up heat by day and release it at night. Even a few water jugs painted black help.
What to grow
- Seedlings in early spring, weeks before outdoor planting
- Tomatoes and peppers through a longer season
- Winter salad greens and herbs
Before you build
Check local rules: many towns treat attached structures differently from sheds and may require a permit. Keep the greenhouse a little away from windows that you need for ventilation in the house.
Start small. A shelf-sized lean-to used every week does more for your garden than a big one you rarely open.