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Swallow Swan 8x21 Wooden Greenhouse

Swallow Swan 8x21 Wooden Greenhouse
Click images to enlarge - Pictures are for illustration purposes
Pay Only 20% Today!!

Pay only 20% deposit today on Swallow greenhouses and pay the remainder on installation.

Call us now on 0800 098 8877

Greenhouse Dimensions

  • A: 2660mm (8ft 9")
  • B: 6702mm (21ft 11")
  • C: 1730mm (5ft 8")
  • D: 2660mm (8ft 9")
  • E: 1200mm (3ft 11")
  • F: 1980mm (6ft 6")
  • G: 2660mm (8ft 9")
  • H: 730mm (2ft 5")


Thermowood Greenhouse

ThermoWood® is a special thermally modified timber developed in Finland. The timber is heated treated up to 215 °C to remove all excess moisture. This wood is well suited for outdoor applications where demanding weather conditions are the norm. The key performance features of ThermoWood® over normal timber are:

Improved durability against decay
Resin removed
Improved dimensional stability
Consistent colouring throughout
Reduced equilibrium moisture content

The timber is used extensively throughout Scandinavia for all sorts of interior and exterior construction, cladding and decoration due to it’s good looks and superb resilience to harsh weather.

Autovents as Standard

Greenhouse Roof Auto Vents

Swallow use high quality Bayliss XL Automatic roof vent openers as standard on every roof vent. Even when you're not around your greenhouse will be well ventilated.

T-Shape Staging

T Shaped Greenhouse Staging

Swallow include a length of slatted staging with all greenhouses that is 520mm wide and 745mm high.

Installation Included

Swallow Greenhouses are delivered and installed countrywide for free. You simply order your new greenhouse and it will be delivered and erected in your garden by a Swallow fitting team.

Custom Build?

Custom Wooden Swallow Greenhouse

If you like one of our Swallow Greenhouses but would like to customize it to suit your space or specialist use just ring us and we'll discuss your needs and get you a quote. Easy!

Damp Barrier

Swallow Greenhouse Damp Barrier

20mm black PVC section screwed to the bottom of the greenhouse stops damp rising into the timber.

  • Buy NOW
  • £5683 inc VAT
  • Scroll Down
    to see Options and Sizes for this product
  • Pay only a
    20% Deposit
  • £1137
  • FREE Installation!!
  • FREE Delivery

    + Installation

    within 4-6 Weeks

    North of Glasgow scroll down for delivery option. Offshore deliveries please call.

Standard Features Include:

  • 2660mm (8ft 9") Wide T-Shaped Wooden Greenhouse - Large Growing Space
  • 730mm (2ft 5") Long Porch - Porch Entrance
  • ThermoWood® Construction - Heat treated high performance timber.
  • Bottom Boards 12mm - Tongued and Grooved with stainless steel nails
  • Glazing Grooves to hold glazing - Silicone Sealed
  • Double Doors with Mortise Lock - Added Security
  • 4mm Toughened Glazing - Safe, Strong and Family Friendly
  • 8 Opening Roof Vents - For Ventilation.
  • 8 Bayliss XL Autovents - Automatically opens your roof vent
  • Guttering to all sides - Collect all that lovely rain water !
  • 2 Front returned stagings - 520mm wide, 745mm high
  • Copper Roof Valley - Roof Drainage and Rust Free
  • 20mm Black PVC Damp Barrier - Screwed to bottom for
  • 10 Year Warranty - on Timber
  • Installation Included in Price - Just order and everything is done for you !

The 8ft x 21ft Swallow Swan looks great and with it’s 8ft wide porch entrance it’s very spacious. It’s also delivered and installed for FREE !

4mm Toughened glass is standard on all Swallow wooden Greenhouses and is held in special grooves within the frame and then sealed in place with quality silicone. Inward opening double doors with mortise locks are also standard.

Each roof vent is supplied with Bayliss XL autovents to automatically open the roof vents when you’re not around to stop over heating. You also get a full length of slatted staging down one side of the greenhouse for working on and storing your plants.

The Swallow Swan is yet another great Swallow greenhouse hand built by British craftsmen with a lovely traditional look. It has a 10 YEAR WARRANTY and free installation. We recommend Swallow greenhouses as they are the best British made wooden greenhouse available today.

Options: Click options to add them to your order then click "Buy"


Dwarf Wall Greenhouse Option

  • Dwarf Wall Version

    Dwarf Wall Version

    Order this Greenhouse customised to sit on a brick dwarf wall. Select this option and we'll send you a wall plan to give to your brick layer to complete your wall. We'll then install a version of this greenhouse with a window sill straight onto the wall.

    + £0

    Click to Select

Painted Finish

The paint is applied in Swallow’s specialist spray booth with an opaque protective top coat with a flexible microporous film. This paint finish is resistant to bacterial mold and UV sun damage. Custom colours are available and will be colour matched to your choice using Swallow’s in-house specialist paint.

Useful Extras

  • High Level Shelf

    High Level Shelf

    Add a 250mm wide high level shelf for extra storage of plants, seeds and tools etc

    + £185.00

    Click to Select

  • Extra Side of Staging

    Extra Side of Staging

    Add another side of staging to the other side of your greenhouse.

    + £370.00

    Click to Select

Porch Extension

  • Porch Extension to 4ft Long

    Porch Extension to 4ft Long

    Extend the porch length of your Swallow Greenhouse to 4ft long, giving more storage space.

    + £339.00

    Click to Select

  • Porch Extension to 6ft Long

    Porch Extension to 6ft Long

    Extend the porch length of your Swallow Greenhouse to 6ft long, giving more storage space.

    + £678.00

    Click to Select

More Useful Extras

  • Black Ornate Door Handle

    Black Ornate Door Handle

    Add a black wrought iron ornate door handle


    Click to Select

  • Bench with Shelf

    Bench with Shelf

    Add a useful work bench with lower shelf that you can move around the greenhouse to suit you. Dimensions: 1200mm x 540mm



    Click to Select

  • Sparrow Cold Frame

    Sparrow Cold Frame

    Add a Sparrow Coldframe to give even more room for seedlings and plants. Dimensions: 2ft 1” X 4ft 5”



    Click to Select

  • Side Vent

    Side Vent

    This side vent opening window will give your greenhouse good ventilation by letting cool air flow in to regulate the temperature and humidity inside, without having to leave the door open.



    Click to Select

  • Dwarf Wall Version

    Dwarf Wall Version

    You can have this greenhouse built on to a "dwarf wall". Rather than having a boarded base we can manufacture the greenhouse so that it will sit upon a brick wall. Wall height needs to be 607mm high. Simply order your greenhouse with this option applied and we'll email you a wall plan to give to your builder to construct your wall. When your new greenhouse is delivered it will be installed on to the wall you've had built.


    Click to Select

  • Palma 2kW Electric Greenhouse Heater

    Palma 2kW Electric Greenhouse Heater

    The thermostatically controlled Palma heater is accurate to +/- 2C with an air circulation rate of 162m/h to ensure even distribution of the heat into your greenhouse in the colder months



    Click to Select


  • I require delivery north of Grangemouth

    I require delivery north of Grangemouth

    Orders north of Grangemouth incur an additional cost of £600


    Click to Select

Swallow Swan 8x21 Wooden Greenhouse

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