A greenhouse kit gives you everything to assemble a greenhouse in one package — frame, glazing and fixings. They range from tiny patio units to large walk-in glasshouses, so the right kit depends on your space, climate and how you’ll use it. This guide covers the choices that matter before you buy.
GrowPlants is reader-supported. We may earn a commission from qualifying purchases made through links on this page, at no extra cost to you.
Kit types at a glance
- Mini / growhouse kits — tiered, covered frames for a patio or balcony. See mini greenhouses.
- Compact & small kits — step-in houses for smaller gardens. See small greenhouses.
- Walk-in kits — full-height houses you work inside. See walk-in greenhouses.
- Lean-to kits — mount against a wall to save space. See lean-to greenhouses.
What to check in any kit
- Glazing — multi-wall polycarbonate (safe, insulating) or glass (clear, premium).
- Frame — aluminium (light, rust-proof) or coated steel (strong) sized to your wind exposure.
- Ventilation — roof and side vents included, not an afterthought (see ventilation & fans).
- Anchoring / base — a base kit or ground anchors; unanchored kits fail in storms.
- Assembly — check reviews for fit and instructions; some kits need two people and a day.
How to choose
Buy the largest kit your space and budget allow (greenhouses fill fast), choose polycarbonate for most homes, insist on real ventilation, and plan the base before delivery. Match frame strength to how exposed your site is. For the full decision framework see the main greenhouses.
Popular greenhouse kits
Bases & anchoring
Quick questions
Are greenhouse kits easy to assemble? Small kits go up in an afternoon; larger walk-ins take longer and often two people. Check the instructions and reviews first.
Glass or polycarbonate kit? Polycarbonate for most home gardens (safe, insulating); glass for clarity on sheltered sites.
Choose your kit by these five factors
- Space — balcony/patio → mini or lean-to; small garden → compact/walk-in; room to spare → larger walk-in.
- Crop height — tomatoes and climbers need walk-in headroom; seedlings suit a mini/growhouse.
- Season goal — frost protection and a spring start vs year-round growing (favours insulated polycarbonate).
- Wind exposure — exposed sites need a strong frame and anchoring; avoid flimsy PE covers.
- Expansion — modular ranges let you add bays later.
Then open the matching guide: mini, small, walk-in, lean-to or polycarbonate.