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Swallow Raven 8x20 Wooden Greenhouse

  • 8ft 8" wide x 20ft 10" deep
  • 8ft 8" Ridge Height
  • Includes Installation
  • 3mm Toughened Glazing
  • Redwood Pine Thermowood
  • Heated Treated for Superior Resistance to Moisture and Warping
  • 20mm PVC Damp Proof Barrier on the Base
  • Stainless Steel Nails Throughout
  • Double Hinged Doors with Mortice Lock
  • 4 x Automatic Roof Vents
  • Full Length of Staging Included
  • 12-year Warranty
Greenhouse Size Diagram

Greenhouse Dimensions

A: Greenhouse width

2660mm (8′ 8″)

B: Greenhouse depth

6360mm (20′ 10″)

C: Ridge height

2660mm (8′ 8″)

D: Eaves height

1730mm (5′ 8″)

E & F: Door Size

1200mm (3′ 11″) x 1940mm (6′ 4″) (aperture)

Minimum Base Size

2660mm (8′ 8″) x 6360mm (20′ 10″)

Customise your Greenhouse

More Sizes:

+13 more sizes, click to see all

Painted Finish

Natural
Oiled + £1,082
Lily White + £2,147
Bracken + £2,147
Olive + £2,147
Railings + £2,147
Black + £2,147
Oxford Stone + £2,147
Vert de Terre + £2,147
Purbeck Stone + £2,147
Moles Breath + £2,147
Lulworth Blue + £2,147

Add Premium options?

Premium Cresting
+ £650

Finish of the styling of your Swallow greenhouse with the traditional premium aluminium cresting and finials.

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Add Additional Staging and Shelving?

Extra Side of Staging Oiled Finish
+ £637

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

High Level Shelf Oiled Finish
+ £321

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

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Add Rainwater Systems?

Black Rainwater System
+ £459

Add a Black Rainwater System to collect and reuse all of that lovely rainwater. Rainwater is after all the best water for your plants.

Add Dwarf Wall Option?

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.

Add More Useful Extras?

Side Vent
+ £149

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.

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Painted Side Vent
+ £168

Give your greenhouse extra ventilation by letting cool air flow in to regulate the temperature and humidity inside.

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Additional Double Greenhouse Door
+ £680

Add an additional double door to the rear of your greenhouse for access back and front.

Additional Double Greenhouse Door Painted Finish
+ £772

Add an additional double door to the rear of your greenhouse for access back and front.

Swallow Wren Cold Frame Oiled Finish
+ £468

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

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Swallow Sparrow Frame Oiled Finish
+ £550

4ft x 3ft Cold Frame with toughened Safety Glass.

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Bench with Shelf Oiled Finish
+ £359

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

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External Shed Door (With Shed Extension Only)
+ £408

Add a door at the rear of your shed extension.

Combination Shed

Combination Shed Extension 8ft x 4ft
+ £1,455

Add this useful 8ft x 4ft combination shed to the back of your greenhouse for extra storage. Comes with Floor and 2 Side Shelves

Combination Shed Extension 8ft x 6ft
+ £1,867

Add this useful 8ft x 6ft combination shed to the back of your greenhouse for extra storage space. Comes with Floor and 2 Side Shelves

Combination Shed Extension 8ft x 8ft
+ £2,277

Add this useful 8ft x 8ft combination shed to the back of your greenhouse for extra storage. Comes with Floor and 2 Side Shelves

Combination Shed Extension 8ft x 10ft
+ £2,661

Add this useful 8ft x 10ft combination shed to the back of your greenhouse for extra storage space. Comes with Floor and 2 Side Shelves

Combination Shed

Painted Combination Shed Extension 8ft x 4ft
+ £1,819

Add this useful 8ft x 4ft combination shed to the back of your greenhouse for extra storage.

Painted Combination Shed Extension 8ft x 6ft
+ £2,333

Add this useful 8ft x 6ft combination shed to the back of your greenhouse for extra storage.

Painted Combination Shed Extension 8ft x 8ft
+ £2,846

Add this useful 8ft x 8ft combination shed to the back of your greenhouse for extra storage space.

Painted Combination Shed Extension 8ft x 10ft
+ £3,358

Add this useful 8ft x 10ft combination shed to the back of your greenhouse for extra storage space.

The 8ft x 20ft Swallow Raven is the largest greenhouse in the Raven range. It`s practical double door design gives easy access and it`s installed for FREE !

3mm 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 overheating. You also get a full length of slatted staging down one side of the greenhouse for working on and storing your plants.

The Swallow Raven is the finest 8ft wide wooden greenhouse available today and when you consider it has a 12 Year Warranty and free installation, it`s not hard to understand why we rate Swallow wooden greenhouses so very highly.

Thermowood Greenhouse
Why is ThermoWood the Best?

ThermoWood is a thermally modified timber known for its durability and stability in harsh weather.

Oiled Panel
Oiled Finish

Oiling Wood enhances its natural beauty and prolongs its lifespan.

Greenhouse Roof Auto Vents
Autovents as Standard

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.

Swallow Staging Included
Staging Included

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

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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.

Swallow Greenhouse Damp Barrier
Damp Barrier

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

Swallow Products
Swallow Products

Swallow GB Ltd prides itself on its attention to detail, offering products that are not only functional but also enhance the beauty of any garden. Their greenhouses are built to last, with features like toughened safety glass and automated ventilation systems, ensuring an optimal growing environment..

Swallow 12 Year Warranty
12 Year Warranty

Swallow products come with a 12 year warranty that covers the Timber for Rot, Decay and Insect Infestation. Buildings must be re-treated inside and outside annually with a high-quality wood preserver according to the maintenance advice

Frequently Asked Questions

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Verified Customer
Rev P
8x8 Swallow Raven Greenhouse + 4ft Shed Combination
Order process easy, staff helpful, completed on time. And installation precise and already working well. Thank you.
Review Image - 8x8 Swallow Raven   Greenhouse + 4ft Shed Combination
5 people found this review helpful.
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Mr A
Swallow Raven 8x10 Wooden Greenhouse + Install
Delivered on the date agreed, erected by a friendly team in just an hour and a half and looks great, can't wait to fill it up. Jeremy
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Mary H
8x12 Swallow Raven Greenhouse + 4ft Shed Combination
Very easy purchase of a swallow raven greenhouse. No fuss, tidy installation on appointed day and time by two competent and friendly guys. Love my new greenhouse. Working on filling it up!
Review Image - 8x12 Swallow Raven   Greenhouse + 4ft Shed Combination
2 people found this review helpful.
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