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Small Lean-To Greenhouses
Small lean-to greenhouses attach to an existing wall, saving space and borrowing stored heat from the building. We stock 20+ aluminium-framed models from 1ft to 5ft wide, starting from £339. Every model includes toughened or horticultural glass, integral guttering, and free UK mainland delivery. Wall-mounted lean-tos extend your growing season by 6–8 weeks and cost 20–30% less than equivalent freestanding greenhouses. Warranties range from 5 to 25 years depending on the manufacturer.
About Our Small Lean-To Greenhouses
Small lean-to greenhouses attach to an existing wall, borrowing heat from your house, garage, or garden building. That shared wall acts as a thermal store — absorbing heat during the day and releasing it overnight. This extends your growing season by 6–8 weeks compared to outdoor beds. Models range from 1ft wide (a narrow side passage) to 5ft wide (staging and growing beds side by side).
Our range includes the Access Value 2x4 Lean-To with toughened glass and a 25-year warranty, the Vitavia Ida Lean-To starting from £289, and the Elite Windsor 4ft Wide Lean-To with 10 powder-coated colour choices. Every model ships free to UK mainland addresses.
Why We Chose This Range
"We've fitted lean-tos against every wall type — Victorian brick, pebbledash, rendered block, even old stone farm buildings. The models here bolt up cleanly and seal properly against uneven surfaces. We dropped brands with flimsy clip-together frames. They flex in wind and leak at the wall junction. Every lean-to here uses extruded aluminium profiles with proper wall flashing. That's the difference between 5 years and 20." — Matt, Greenhouse Stores
Types of Small Lean-To We Offer
1ft & 2ft Wide Lean-Tos
The narrowest models, designed for side passages and tight patios. A 1ft wide lean-to holds 6–8 pots on two shelves. A 2ft wide lean-to adds enough depth for tomato grow bags. Both sit flat against the wall and project less than 700mm from the brickwork.
4ft & 5ft Wide Lean-Tos
Room for staging on one side and growing beds on the other. A 4ft wide lean-to accommodates 8–10 tomato plants or a full herb garden. The 5ft models give comfortable working space with headroom above 6ft at the ridge.
Quick Guide: Which Width Do You Need?
Herbs and seedlings only? A 1ft or 2ft model gives you enough shelf space. Growing tomatoes and peppers? Go 2ft or 4ft wide for grow bag depth. Want to overwinter plants and start seeds? A 4ft or 5ft model with staging on one side gives you year-round flexibility.
Small Lean-To Greenhouse Comparison
| Model | Size | Glazing | Warranty | Price From |
|---|---|---|---|---|
| Access Half Westminster 1x3 | 1ft x 3ft | Toughened glass | 25 years | £324 |
| Vitavia IDA 900 2x4 Toughened * | 2ft x 4ft | Toughened glass | 12 years | £339 |
| Access Value 2x4 Lean-To | 2ft x 4ft | Toughened glass | 25 years | £389 |
| Access Hampton 2x3 | 2ft x 3ft | Toughened glass | 25 years | £599 |
| Access Hampton 2x5 | 2ft x 5ft | Toughened glass | 25 years | £739 |
| Access Hampton-D 3x6 | 3ft x 6ft | Toughened glass | 25 years | £949 |
* Matt's Pick — best-selling small lean-to with toughened safety glass and 12-year Vitavia warranty
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Matt's Pick: Best Small Lean-To GreenhouseBest For: Compact patios and side passages where space is tight Why I Recommend It: The IDA 900 is our best-selling small lean-to for good reason. Toughened safety glass, integral guttering, and a 2x4 footprint that fits against any wall. I've fitted hundreds of these and they go up in under two hours. Price: £339 |
Matt's Installation Tip
Always check your wall is plumb before ordering. Hold a spirit level against the brickwork where the greenhouse will sit. If the wall leans more than 10mm over the frame height, you'll need packing shims behind the brackets. We sell a guide to fitting lean-tos on uneven walls that covers this in detail. Also measure your available width at both ground level and head height — old walls often taper.
Frequently Asked Questions
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What is a small lean-to greenhouse?
A lean-to greenhouse attaches to an existing wall instead of standing alone. It uses your house, garage, or garden wall as one side. This reduces materials, cuts cost, and borrows stored heat from the building. Models range from 1ft to 5ft wide, fitting side passages, patios, and courtyards. A freestanding greenhouse would not fit these spaces.
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How much does a small lean-to greenhouse cost?
Small lean-to greenhouses start from around £220 for polycarbonate models. Aluminium-framed models with toughened glass cost £350–£800. Premium options with powder coating and wider footprints reach £1,200–£1,600. All prices include free UK mainland delivery. Professional installation is available from £299 depending on size and location.
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What wall do I need for a lean-to greenhouse?
You need a solid wall of brick, stone, or block construction. House walls, garage walls, and substantial garden walls all work well. South-facing walls get maximum sunlight (6–8 hours daily) and suit tomatoes, peppers, and chillies. East or west-facing walls get 4–5 hours and suit salad crops and herbs. Read our best position for a greenhouse guide for help choosing.
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Do I need planning permission for a lean-to greenhouse?
Most small lean-to greenhouses fall under permitted development. You do not need planning permission if the greenhouse covers less than 50% of your garden, sits below 2.5m at the eaves near a boundary, and is not in front of your house. Listed buildings and conservation areas have stricter rules — check with your local authority before ordering.
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Do I need a base for a small lean-to greenhouse?
Yes, every lean-to needs a solid, level base. For 1x3 and 2x3 models, 2–3 paving slabs laid level will do the job. Larger models (4ft+ wide) benefit from a concrete pad or compacted gravel with timber edging. The base should extend 50–75mm beyond the frame on all sides and be level within 5mm. See our greenhouse base preparation guide for step-by-step instructions.
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What can I grow in a small lean-to greenhouse?
Tomatoes, cucumbers, peppers, herbs, and overwintering plants all thrive. A 2x4 model fits 2–3 tomato grow bags or a productive herb garden. The wall heat extends your growing season by 6–8 weeks at both ends of the year. In winter, use the lean-to to protect tender plants like fuchsias, geraniums, and citrus trees from frost.
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How do small lean-to greenhouses compare to freestanding models?
Lean-tos cost 20–30% less than equivalent freestanding greenhouses. They use one fewer wall of glazing, saving material. They also retain heat better because the shared wall stores warmth. The trade-off is less internal light from one side, though a south-facing wall more than compensates. Installation takes 30–40% less time because you're bolting to an existing structure. Browse our full lean-to greenhouse range if you need larger sizes.
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