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Magnum 812 Aluminium Greenhouse 8'4x12'5


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  • £919.00
  • including VAT
You will earn up to 919 reward points after purchasing this product.

Magnum 812 Aluminium Greenhouse (3.83x2.57m) The Magnum 812 Aluminium Greenhouse has additional eaves and ridge height and a double sliding door 3.83x2.57m wide.

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  • SKU
    70890, 70944, 70892, 70893

Magnum 812 Aluminium Greenhouse (3.83 x 2.57m)

The Magnum Greenhouse is a must for the real enthusiast. It's strong aluminium frame incorporates integral guttering, easy clip-in glazing, cast joints at both ridge and eaves, together with a box-section ridge ensures for a sturdy greenhouse all year round. The Double Doors allow generous access giving plenty of room for your wheelbarrow and the additional height to both the ridge and eaves provides you with greater headroom and plenty of ventilation aided by the standard roof vent.

*Please note that the price of £919.00 is for the silver option with horticultural glass.

Colour Options:

There are two colours available for this green house, silver and green. Please use the drop down box below to select your preferred colour and glazing option.

Glazing Options:

  • Standard 3mm Short Pane Horticultural Glass - the traditional glazing method allowing sunlight in to nurture young plants.
  • Toughened Glass - allows sunlight to nurture plants in the same way as Horticultural Glass, Toughened to British Standard Class 6206 for maximum light and extra safety. 

Greenhouse Base
It's crucial that you set your greenhouse onto firm foundations. A prefabricated steel base is available as an option.


Greenhouse Dimensions:

  • Width: 2.57m (8'4)
  • Depth: 3.84m (12'5)
  • Eaves Height: 1.48m (4'9)
  • Ridge Height: 2.58m  (8'5)
  • Growing Area: 9.9m square
  • Door Opening Width: 1200mm
  • Roof Vents: 4


We offer numerous accessories to compliment your greenhouse, please contact us should you wish to add louvers, staging, shelving, vents, rain water kits, automatic openers etc to your Halls Greenhouse or add them separately to your order by selecting them from the Halls Greenhouse Accessories Section

* This manufacturer may charge extra for delivery to Scotland, Wales, Offshore Islands, Cornwall, Devon and Somerset. Please enquire before ordering if you think this might apply to you. Your delivery maybe delayed if not checked at point of order.

Please look at our terms and conditions

  • Expected Delivery time
    Average 28 Working Days
  • PDF
    ./pdf/halls_greenhouses.pdf
  • Glazing Options
    70890 Silver Frame and Horticultural Glass Required, 70902 Silver Frame and Polycarbonate Glazing Required, 70944 Silver Frame and Toughened Glass Required, 70903 Green Frame and Polycarbonate Glazing Required, 70892 Green Frame and Horticultural Glass Required, 70893 Green Frame and Toughened Glass Required
  • Base Option
    Not Required, Standard base required (SO1652), Forest green base required (SO8319)
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Returns Faulty Goods
All goods supplied are newly constructed for sale and as such are manufactured to match the specifications shown within the product literature.
From time to time we do sell stock clearance and ex display lines, these items are clearly marked as such and this should be taken into consideration prior to ordering.
If the product is damaged or broken on arrival you can return the goods for the supply of a merchantable replacement, or a full refund if appropriate. It is imperative that if any part of your order is damaged then a photo should be taken of the product in situ e.g. for log cabins the damaged part must remain on the pallet.
Damage should be reported within 5 working days of delivery and we may request photographic evidence of the condition of the damage or faulty item, you should not attempt to fit or modify the product in anyway and must retain the original packaging.
In the case of larger products such as sheds, log cabins etc we will arrange with the manufacturer to collect the goods. For our smaller items it may be necessary for The customer to return them to the manufacturer by post.
It is the responsibility of the customer to retain possession and take reasonable care of the goods until they have been returned to the possession of; The Company, the manufacturer or their appointed carriers. We cannot accept back for a full refund any item which has been assembled or modified in any way.
If on return the product is found to be be of merchantable quality, complete and as described for sale, any return charge will apply and will be deducted from the order monies held at cost.
Reimbursement of rejected goods, less any charges defined above, will be made to the customer as soon as possible and certainly within a period not exceeding 30 days from the date of return.

Where goods are returned by agreement, the Buyer shall (in every case) state the order number, date and reason for return and agrees to pay such reasonable restocking charge as may be determined by The Company from time to time and made known to the Buyer.

Returns Cancelled Orders
In line with The Distance Selling Regulations, and the SafeBuy Code of Practice 'The Customer' shall have a period of 14 working days after the date of delivery within which time they may cancel their order for a product with the exception of goods that have been made to The Customers own specification.
Cancellations should be sent by email, by telephone or by registered post to 'The Company' trading address, quoting the order reference given when the order was placed.
In the case of larger products such as sheds, log cabins etc we will arrange with the manufacturer to collect the goods. For our smaller items it may be necessary for the customer to return them to the manufacturer by post.
It is the responsibility of The Customer to retain possession and take reasonable care of the goods until they have been returned to the possession of, The Company , the manufacturer or their appointed carriers. We cannot accept back for a full refund any item which has been assembled or modified in any way.
It is the responsibility of The Customer to meet all product return costs and where The Company is arranging collection the customer will be notified of the return charge prior to undertaking the process.
Reimbursement of cancelled orders monies, less any charges defined above, will be made to the customer as soon as possible and certainly within a period not exceeding 30 days from the date of return.