Swallow Heron 18x8 ThermoWood Lean To Greenhouse and Installation

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There's no doubting that the Heron 18ft x 8ft wide Lean To greenhouse will prove particularly attractive to serious gardeners as it offers a massive opportunity to grow and impressive range of plants.   

This is a very productive and traditionally styled structure that benefits from the outstanding qualities of ThermoWood®. Heat treatment has stabilised the wood and, with moisture and resin removed, it will not suffer from rot or warp. 

The timber's lifespan is therefore expanded and there is no need for preservatives. It's worth remembering that only Swallow manufacture greenhouses using this marvellous material.

Inside the greenhouse you'll find fantastic growing conditions. Four roof vents encourage an effective flow of fresh air, essential to avoid overheating. Staging along one side comes as standard, more can be optioned if required as well as a high shelf.

Toughened glass allows in lots of light while access is straightforward, even if you have a wheelbarrow or large equipment, through double doors that are fitted with a mortice lock.

All gardeners will recognise this lean to as a superb structure with the added value of delivery and installation included in the price.

18x8 Heron Lean To Features:

  • ThermoWood®: Heat treated Scandinavian timber that's rot and warp resistant
  • Glazing: 3mm Toughened safety glass
  • Roof Vents: Four with auto openers
  • Staging: On one side (L shape optional extra)
  • Doors: Double installed as standard
  • Glazing Bars: 58mm x 34mm finished size
  • Bottom Tongue & Groove: 12mm boards, 390mm long
  • Locks: Door has a mortice lock & aluminum handles
  • Glazing: All glazing is slid into a groove & sealed with quality silicone
  • Joints: All the cut shapes are jointed with a clear plastic H section
  • Capping: The ridge and top vents are sealed with a specially machined timber capping
  • Damp Barrier: 20mm black PVC section screwed to the bottom
  • Stainless Steel Nails: Used to fix all the tongue/groove boards
  • Delivery and installation included in price

18x8 Heron Lean To Dimensions:

  • Gable width: 2640mm (8ft 8ins) 
  • Length: 5730mm (18ft 10ins)
  • Eaves height: 1730mm (8ft 4ins) 
  • Ridge height: 3260mm (10ft 8ins)
  • Door width: 1200mm (3ft 11ins)
  • Door height: 1980mm (6ft 6ins)

Note: Larger 20ft x 8ft and smaller 16ft x 8ft versions of this Lean To are available.

Optional Extras for your Swallow Greenhouse

Staging along one side is included as standard in your Swallow GB Greenhouse, however, an additional High Level Shelf and Extra Staging on the end to make an L shape is an option below and can also be painted in a colour to suit. The Hunter Gutter and Downpipe Kit allows you to collect and reuse rainwater - the best water for all plants - this is available as an optional extra below.

Please Note: Imagery may show Dove Lean To's of a different size and optional extras that must be purchased separately. A suitable flat, level and sturdy base must be prepared before the delivery / Installation date to ensure a hassle free installation.

Select Your Options

Build Design - Please Choose Your Required Door Position

  • with Door on the Left Side

  • with Door on the Right Side

Option 1: Would you like your Greenhouse Painted?

  • with Standard ThermoWood® Finish

  • with ThermoWood® Finish in BRACKEN


  • with ThermoWood® Finish in OLIVE


  • with ThermoWood® Finish in EARTH


  • with ThermoWood® Finish in LILY WHITE


Option 2: Would you like to add Extra Staging?

  • with ThermoWood® Extra Staging


Option 3: Would you like to add a High Level Shelf?

  • with ThermoWood® High Shelf


Option 4: Would you like to add a Rainwater System?

  • with Swallow Hunter Rainwater System in WHITE


  • with Swallow Hunter Rainwater System in BLACK


Option 5: Please choose a Delivery option -

  • including Delivery/Installation within Mainland UK

  • including Delivery/Installation within Scotland (North of Grangemouth)


Additional Accessories for your Greenhouse

  • with Ornate Black Door Handle


Delivery Info


Inclusive delivery and installation is limited to UK Mainland excluding areas 15 miles further North of Glasgow. Areas further than this and Offshore Islands would require a custom quote. Please Contact Us here if this is the case.
A suitable, flat and level base must be prepared prior to the delivery and installation.

Price Promise

If you find any of our products in stock and immediately available, at our competitors we will try out best to match the price. We do not charge extra for delivery or installation, but if you find somewhere cheaper, please Contact Us so that we may try to match the price or beat it.


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£3,861.00 inc. VAT