The Swallow Lark is the narrowest greenhouse in the Swallow range at just 4ft wide, built from rot-resistant ThermoWood®. Choose from 8 sizes with prices from £2,575 to £4,164. Every model includes 3mm toughened safety glass, automatic roof vents, full-length slatted staging and a mortise lock door. Hand-built in Rotherham with a 12-year warranty and free professional installation.
We fit the Lark in gardens where a standard 6ft model simply will not go. At 4ft wide, it sits against walls, beside paths and in side returns. Despite its compact footprint, the growing space is well designed. The high eaves give headroom for tomatoes and climbing crops.
ThermoWood® is heat-treated at 215°C, removing moisture and resin. It resists rot without chemical preservatives. For a wider option, see the Swallow Robin at 5ft 8in. A factory-painted finish is also available in the Swallow Lark Painted range. Browse our full Swallow Greenhouses collection for all models.
Free Installation
Free Installation
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Photos from customers and our own installers - real greenhouses in real gardens.
The Swallow Lark is a 4ft wide wooden greenhouse designed specifically for narrow UK gardens. Hand-crafted in Rotherham from Scandinavian ThermoWood® baked at 215°C, it delivers the same build quality as larger Swallow models. It fits side passages, terraced gardens, and tight spots where a 6ft greenhouse will not go.
This range includes 8 models from the compact Swallow Lark 4x4 at £2,575 through to the Swallow Lark 4x10 at £3,154. Painted options are available in 10 colours, starting from £3,398 for the Painted Swallow Lark 4x4. Browse our full Swallow Greenhouses range or explore all Wooden Greenhouses.
Why We Chose This Range
"The Lark solves a real problem. Many customers have 5ft or less between a fence and a wall. Every other greenhouse on the market is too wide. At 4ft 7in, the Lark slots into that gap perfectly. When we install these, the build quality is identical to the larger Kingfisher. Same ThermoWood, same toughened glass, same staging. It is just narrower."
, Matt, Founder of Greenhouse StoresAll Lark models are 4ft 7in (1400mm) wide. Prices include free UK mainland delivery and professional installation.
| Model | Length | Oiled Price | Painted Price |
|---|---|---|---|
| Lark 4x4 | 4ft (1300mm) | £2,575 | £3,398 |
| Lark 4x6 | 6ft (1910mm) | £2,762 | £3,644 |
| Lark 4x8 | 8ft (2520mm) | £2,958 | £3,903 |
| Lark 4x10 | 10ft (3130mm) | £3,154 | £4,164 |
Measure your available width carefully before ordering. The Lark needs 4ft 7in for the greenhouse itself plus 300mm clearance on at least one side for maintenance access. If your passage is exactly 5ft wide, it will fit. However, you will not be able to walk around the outside. We always ask customers to send us a photograph of the space before confirming the order.
Prices start from £2,575 for the 4x4 oiled model. The most popular 4x6 costs £2,762 in oiled finish. Painted versions start from £3,398. All prices include free UK mainland delivery and professional installation. You pay just 20% deposit when ordering.
The Lark is 4ft 7in (1400mm) wide externally. It is designed for narrow spaces where 6ft greenhouses will not fit. Check that your width allows at least 300mm clearance on one side for maintenance access. Length options from 4ft to 10ft let you choose the depth that suits your available space.
No chemical treatment is required. ThermoWood is heat-treated at 215°C, making it naturally resistant to rot, warping, and insect damage. The oiled finish protects and improves the timber. A 12-year manufacturer warranty covers all timber against decay.
Every Lark includes toughened glass, staging, auto vents, and free installation. You get 3mm toughened safety glass, full-length slatted staging, and automatic Bayliss roof vent openers. A mortise lock, stainless steel handle, and 20mm PVC damp barrier are also standard. Free installation is included on all orders.
The Lark offers better insulation and wind resistance than aluminium alternatives. The ThermoWood frame holds glass with full-length timber beading rather than the wire clips used on aluminium models. This makes it far more secure in exposed positions. The included free installation also closes the price gap significantly, as aluminium greenhouses require DIY assembly or a paid installer.
