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A greenhouse extends your growing season by two to four months, protects tender plants from wind and pests, and turns a back garden into something that grows year-round. The same qualities — warmth, humidity, shelter — also amplify mistakes, so the kit you buy and the spot you put it matter more than you'd think.
Beginners are well served by 6×8 to 6×10 ft polycarbonate kits in the $300–$900 range. They go together in an afternoon with one helper, hold heat well enough for shoulder-season growing, and survive winter in zones 6–9 without active heating. That covers most home gardeners.
If you're starting from scratch, grab the greenhouse starter checklist first — it lists every site prep step in order, so you don't miss a base or a wind anchor before the kit arrives.
Choosing the right kit size
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See our choosing your greenhouse guide for the full breakdown.
Glazing materials: polycarbonate vs glass vs polyethylene
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See our greenhouse cost calculator for a full cost breakdown by material.
Polycarbonate vs Glass vs Polyethylene
A side-by-side look at how the three glazing options stack up for a first greenhouse kit.
| Property | Polycarbonate | Glass | Polyethylene film |
|---|---|---|---|
| Cost (6×8 kit) | $300–$900 | $1,500–$3,000+ | $150–$400 |
| Durability | 5–15 yr | 20+ yr | 2–4 yr |
| Insulation R-value | R-1.4 to R-1.7 | R-0.9 to R-1.0 | R-0.8 (single layer) |
| Light transmission | ~88% (diffused) | ~90% (direct) | ~85% (direct) |
| Best for | Year-round use, beginners, mixed climates | Permanent gardens, mild climates | Seasonal use, tight budgets, hoop houses |
How much should you spend?
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For a complete cost picture including base, ventilation, and heating, see the greenhouse costs guide.
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Do you need a building permit?
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Before you commit to a kit, run through our greenhouse setup guide — it covers the site prep steps (including permits) in the order you need to do them.
Can a beginner kit survive winter?
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For the full heating breakdown including method-by-method costs, see the winter heating guide.
Where to place your greenhouse kit
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For the full site selection walkthrough, see our greenhouse setup guide.
2 Beginner Kits Worth Buying
These two cover most beginners — a free-standing 6×8 polycarbonate starter kit and a small lean-to for tight or north-facing yards. Both are durable, easy to assemble, and well reviewed.
6×8 Polycarbonate Greenhouse Starter Kit
The sweet spot for most beginners — twin-wall polycarbonate panels insulate well, the frame is light enough for one person to position, and 48 sq ft gives you room for two raised beds plus a small staging table. Easy to assemble in a weekend with one helper. Holds heat well into shoulder seasons without active heating.
See on Amazon →Small Lean-To Polycarbonate Greenhouse
The best choice for back yards where a free-standing kit won't fit, or where the only sunny wall faces south. Lean-tos lose less heat through the shared wall, are easier to anchor, and double as an entry awning. Smaller footprint means lower heating costs — but plan for staging shelves since floor space is tight.
See on Amazon →Some links are Amazon affiliate links. GrowHaus earns a small commission at no extra cost to you. I only recommend products I've used myself.
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Common Questions
Related guides
Free Greenhouse Starter Checklist
The pre-purchase checklist — site prep, base, anchoring, ventilation, and the small extras most beginners forget. Printable PDF included.
🏗️Choosing Your Greenhouse
How to pick a kit, freestanding vs lean-to, and the questions to ask before you click "buy". Use this with the kit-sizes section above.
💲Greenhouse Costs Breakdown
Real costs by tier — kit, base, anchoring, ventilation, heating — plus the hidden extras first-time buyers miss on the first try.
🛠️Greenhouse Setup Guide
The 10-step process from site selection to first plants. Run through this after your kit arrives and the install itself will take one weekend.