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Swallow Lark Greenhouse

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FREE Installation with Swallow Greenhouses!!

The Swallow Lark Greenhouse is our best-selling 4ft wide wooden greenhouse, specifically designed to maximize growing space in smaller UK gardens. Hand-crafted in Rotherham from premium Scandinavian ThermoWood®, this timber is heat-treated to resist rot and warping, offering an impressive 50-year lifespan without the need for annual maintenance.

Every Swallow Lark model includes Free Installation in your garden, ensuring a perfect finish with zero effort required from you.

Standard features include:

  • Durability: 3mm Toughened Safety Glass and rot-resistant ThermoWood®.
  • Ventilation: Automatic roof vents included as standard.
  • Storage: Full-length slatted staging on one side.
  • Security: Inward-opening door with a mortise lock and stainless steel handle.

Available in a natural finish or a range of professional painted finishes, the Lark is the ultimate narrow greenhouse for serious gardeners.

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About Swallow Lark Greenhouses

The Swallow Lark Greenhouse range offers compact wooden greenhouses built specifically for smaller UK gardens. At 4ft 7" wide, these ThermoWood structures pack professional growing capabilities into spaces where standard 6ft or 8ft models won’t fit.

Every Swallow Lark Greenhouse comes with full-length slatted staging, automatic roof vents, and 3mm toughened safety glass as standard. You’ll find models ranging from 4ft to 20ft long, with prices starting from £2,790 for the Swallow Lark 4x4 Greenhouse up to approximately £4,500 for longer configurations. The Swallow Lark 4x6 Wooden Greenhouse sits in the mid-range at around £3,100 and remains our most popular size.

🌿 ThermoWood construction advantage: This heat-treated timber process bakes red pine at 215°C, destroying resins and sealing capillaries to create wood that won’t warp or rot. Unlike pressure-treated timber that requires annual maintenance, ThermoWood arrives with an oiled finish and needs no further treatment. You can leave it natural, or choose from 10 optional paint colours including heritage shades like Farrow & Ball Pigeon.

We’ve sold Swallow Greenhouses for 15 years and consistently see them outlast cheaper alternatives by decades. The manufacturer backs this with a 12-year warranty and free UK mainland installation.

Choosing Your Swallow Lark Greenhouse: Size & Budget Guide

📐 Base preparation: Your base determines everything. The Swallow Lark 4x8 Greenhouse needs a prepared area measuring exactly 4ft 7" × 8ft 4", with concrete or paving slabs providing the level surface. Most customers choose concrete for the 30–50 year lifespan these greenhouses deliver. Our guides on how to build a concrete base for a wooden greenhouse and how to build a paving slab base for a wooden greenhouse provide detailed specifications.
💷 Budget and payment options: Budget between £2,790–£4,500 depending on length. The Swallow Lark 4x10 Greenhouse at approximately £3,600 gives serious growers room for tomato rows and propagation areas while maintaining the compact width. Painted versions add roughly £350–£400 to the base price, with colours like Painted Swallow Lark 4x6 Wooden Greenhouse offering immediate kerb appeal. You pay just 20% when ordering, with the balance due after delivery and installation — ensuring full satisfaction before payment.

Browse our complete Small Wooden Greenhouses collection to compare alternative models, or learn What to Grow in a Greenhouse for Beginners to maximise your growing space.

Frequently Asked Questions

  • How much do Swallow Lark Greenhouses cost?

    Swallow Lark Greenhouses range from £2,790 for the 4x4 model to approximately £4,500 for 4x20 configurations. Most customers choose the 4x6 or 4x8 sizes (£3,100–£3,400), which balance growing space with garden footprint. All prices include free UK mainland delivery and professional installation by Swallow’s factory-trained team.

  • What makes ThermoWood better than pressure-treated timber?

    ThermoWood undergoes heat treatment at 215°C that destroys resins and seals the timber’s cellular structure. This prevents warping and rot without chemical treatments. You get 50-year durability versus 15–20 years for pressure-treated alternatives. The timber arrives pre-oiled and needs no further maintenance, saving you 2–3 hours of annual treatment work.

  • Are Swallow Lark Greenhouses difficult to install?

    Installation is included free and takes the factory team 4–6 hours to complete. You provide the level base — concrete or paving slabs measuring exactly 4ft 7" wide by your chosen length. Swallow checks your base photos before delivery and handles all assembly, glazing, and fitting. You simply point them to the prepared area.

  • Can I add a shed section to my Swallow Lark Greenhouse?

    Yes, Swallow manufactures greenhouse–shed combinations with the 4ft 7" width. These combo units partition the structure into separate growing and storage areas. Minimum length is 8ft (4ft greenhouse + 4ft shed), with staging installed on the greenhouse side only. The Painted Swallow Lark 4x4 Wooden Greenhouse page shows similar compact configurations.

  • How long does delivery take for Swallow Lark Greenhouses?

    Delivery takes 5–6 weeks to most UK mainland locations once you confirm your base is ready. North Scotland, Devon, and Cornwall extend to 8 weeks. Lead times start after you submit base photographs to Swallow, not from your order date. This ensures your greenhouse doesn’t arrive before your base is properly cured and level.

  • What warranty covers Swallow Lark Greenhouses?

    Every Swallow Lark Greenhouse includes a 12-year manufacturer warranty covering craftsmanship, timber, and component failure. Glass breakage isn’t covered, but toughened safety glass rarely fails under normal use. The warranty excludes damage from improper base preparation or customer modifications. In 15 years selling these greenhouses, we’ve seen fewer than 5% require any warranty claims — ThermoWood’s heat treatment at 215°C creates exceptional durability.