Halls Magnum 12ft x 8ft Wide Double Door Greenhouse

(4.7) Based on 2 Reviews


The Magnum range is renowned for strength and space. An aluminium frame is strengthened by cast iron joints and keen gardeners will make the most of the spacious growing area.

Smooth action sliding doors mean easy access and four roof vents ensure excellent air circulation. Whatever you want to grow, this greenhouse will match your ambition.

12x8 Greenhouse Features:

  • Complete with four opening roof vents
  • Virtually maintenance free rust proof aluminium
  • Cast iron joints
  • Integral guttering
  • Three glazing options
  • Halls brand guarantees quality at the right price
  • Technical helpline available

12x8 Greenhouse Dimensions:

  • Growing area: 9.9 square metres (106.56 square feet)
  • Door opening width: 1200mm (47.25 inches)
  • Number of roof vents: 4 opening roof vents
  • Internal height to ridge: 2.58 metres (8ft 6ins)
  • Internal height to eaves: 1.48 metres (4ft 10ins)
  • External width: 2.57 metres (8ft 6ins)
  • External length: 3.84 metres (12ft 7ins)
  • Addition of base adds to the height: 128mm (5 inches)

From the same range link me to the next size: SMALLER   LARGER

From the same range link me to the same size in: GREEN

Show me the same size Universal range with a SINGLE DOOR

When you have selected all the options you may require scroll down the page and Add to basket. As you add options the running price updates in the lower right hand corner.


8ft Wide Base Details


Select Your Options

Halls Autumn Greenhouse Promotion

  • with FREE Two Tier Staging Unit

Option 1 > Greenhouse Glass

  • with Horticultural Glazing (70890)


  • with Long Pane Toughened Glazing (70944)


  • with 4mm Polycarbonate Glazing (70902)


Option 2 > Base Plinth?

  • with Matching Base Plinth


Option 3 > Ventilation?

  • with Matching Louvre Window


  • with Automatic Louvre Window Opener (SO1310)


  • with Additional Matching Roof Vent


  • with Halls Automatic Vent Opener (VentoMatic) (70182)


Option 4 > Greenhouse Installation?

  • with Greenhouse Installation


  • with Additional Accessory Installed


Option 5 > Delivery Options

  • with Standard Delivery in Mainland England, Wales and Scotland (excludes Highlands)

  • with Delivery to NORTHERN IRELAND


  • with Delivery to SCOTTISH HIGHLANDS


  • with Delivery to REPUBLIC OF IRELAND


  • with Delivery to CHANNEL ISLES


  • with Delivery to ISLE OF WIGHT or ISLE OF MAN


Accessories > Staging, Shelving and Work Benches

  • with Halls 1 Tier ALUMINIUM Staging (SO1708)


  • with Halls 2 Tier ALUMINIUM Staging (SO1709)


  • with Halls 4 Foot ALUMINIUM Top Extension Staging (70137)


  • with Halls Aluminium 2ft 10ins Long Shelves (Set of Two) (R04101)


  • with Halls Aluminium 4ft 10ins Long Shelves (Set of Two) (R04104)


  • with Halls Potting Bench (70684)


  • with Halls 5ft Long (10ins Wide) Wire Shelf (F04502)


  • with Halls 5ft Long (20ins Wide) Wire Shelf


  • with Halls 3 Tier Seed Tray Unit and 15 Trays (70668)


Accessories > Water Systems?

  • with Halls Rainwater Kit


  • with Ward by Strata 120 Litre Water Butt (GN337)


  • with Ward by Strata 210 Litre Water Butt (GN335)


Accessories > Plant Care

  • with Halls Junior Greenhouse Heater (R05001)


  • with Halls Senior Greenhouse Heater (R05003)


  • with Halls Maxi Greenhouse Heater (R05005)


  • with Halls 8ft (250cm) Shading Screen (70963)


  • with Halls 12ft (370cm) Shading Screen (70962)


  • with Halls Vanlet Automatic Irrigation Unit (F04201)


Delivery Info

Pay No Money Today

Payment will not be drawn down until the unit is allocated or acknowledged for dispatch, or a delivery date is arranged.

Price Promise

If you find any of our official and genuine Halls products advertised and in stock at any of our competitors we will try our best to match the price. Simply Contact Us if this is the case and we will do our best.


Our greenhouse prices include V.A.T. and Delivery anywhere within mainland UK except Highlands and Offshore Islands which will incur a separate delivery charge. We can even deliver to the Channel Isles and arrange the VAT element for you. In all instances please contact us for a personalised quote.

Delivery will usually be made within 10-14 working days but may be extended during busy months. Any problems relating to the product must be reported within 7 days from receipt of delivery.

  • Goods are delivered via large lorries which can get to most places (about the size of a dustbin lorry).
  • Please ensure that access can be made to your delivery address.
  • Delivery is on a curbside basis only.
  • If glass has been ordered it is packaged in a crate and is lifted off by either tail lift or pallet truck.
  • Deliveries are unable to be moved over gravel, grass or up steps and the driver is unable to carry products through homes or gardens.

Halls Guarantee

See our handy downloadable PDF regarding Halls Guarantee for your reference.

Silverline and Supreme ranges utilize high-grade scratch resistant acrylic to form the curved section.

These prices include V.A.T. and delivery anywhere within mainland UK except Highlands (Postcodes included are: KW, HS and PA) and Islands which will incur a separate delivery charge, including IoW. We can deliver to the Channel Isles and arrange the VAT element for you.

In all instances please contact us.

Reviews (2)

As good as expected

  • Price: Five Stars
  • Quality: Four Stars
  • Delivery: Four Stars

Liked the look of this greenhouse, not least the price which I thought very competitive. The extras are well worth considering, the louvre is good at increasing air circulation and I've found the staging essential. Glad I bought this one.

By Kath Planer , written on Wednesday 24th, August, 2016.

Lots of Working Area

  • Delivery: Five Stars
  • Quality: Five Stars
  • Price: Five Stars

This Halls greenhouse gives you lots of working area for your money and that's why I bought it. The double doors make access in and out of the greenhouse so much easier - I don't think I would recommend a single door greenhouse now I've got double doors. I also ordered some staging and an automatic vent which means one of the windows opens and closes itself as the temperature rises and falls again. Make sure you sue gloves when putting it up, especially with the glass, which is obvious really. The basic frame is very simple to install, the most difficult thing is identifying which piece is which, but a lot of them are the same to be fair. Looks good when finished and with some plants inside.

By Haden J. , written on Monday 22nd, August, 2016.

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£738.99 inc. VAT