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Halls Magnum Green 8 x 12 ft Greenhouse

(4.9) Based on 4 Reviews

Halls Forest Green Magnum 12ft x 8ft Greenhouse (Green Frame)
Halls Magnum Green 8 x 12 ft Greenhouse
Halls Magnum Green 8 x 12 ft Greenhouse
Ventomatic Unit
Halls Magnum Green 8 x 12 ft Greenhouse
Halls Forest Green Magnum 12ft x 8ft Greenhouse (Green Frame)
Halls Magnum Green 8 x 12 ft Greenhouse
Halls Magnum Green 8 x 12 ft Greenhouse
Ventomatic Unit
Halls Magnum Green 8 x 12 ft Greenhouse

How To Install A Halls Greenhouse

Description

The Magnum range is renowned for strength and spaciousness, and you can easily see why.

All serious gardeners will be delighted with over 100 sq ft of growing area and the high ridged robust aluminium frame that has a highly durable finish and cast iron joints.

Growing conditions are efficiently controlled by the four roof vents and access couldn't be easier through the smooth action double doors.

Standard features include integral guttering and there is an impressive number of optional extras.

Stand by to be inspired by this impressive greenhouse!

12x8 Greenhouse Features:

  • Complete with four opening roof vents
  • Virtually maintenance free 'baked on' green finish
  • Cast iron joints
  • Integral guttering
  • Three glazing options
  • Halls brand guarantees quality at the right price
  • Technical helpline available
  • 9.9 Square Metres Growing Area

12x8 Greenhouse Dimensions:

  • External Height To Ridge: 258cm (8ft 6ins)
  • External Height To Eaves: 151cm (4ft 10ins)
  • External Width: 257cm (8ft 6ins)
  • External Depth: 384cm (12ft 8ins)
  • Door Opening Height: 182cm (5ft 11ins)
  • Door Opening Width: 120cm (4ft)
  • Base Height: 12.8cm (5ins)
From the same range link me to the next size: SMALLER   LARGER
From the same range link me to the same size in: SILVER

PDF Downloads

Magnum 8ft Wide Base Dimensions

Halls Magum Instruction Manual

Select Your Options

Option 1 > Greenhouse Glass

with Horticultural Glazing

with Horticultural Glazing (70892)

Standard 3mm glass which consists mostly of 2ft by 2ft panes, overlapping each other with the use of clips to hold one above another. This type of glass is traditional and very economical but tends to shatter into shards when smashed, so isn't recommended if you have children or pets.
  • 17% Off
  • Save £185.00
£1,099.00 £914.00
with Long Pane Toughened Glazing

with Long Pane Toughened Glazing (70893)

Long pane Toughened glass is a lot stronger, and more durable than standard Horticultural glass. In the rare event of it shattering, it breaks into safer smaller pieces. It is also neater and needs less maintenance as no overlapping glass means there is no algae build up and no Z clips to fit.
  • 17% Off
  • Save £240.00
£1,399.00 £1,159.00
with 4mm TwinWall Polycarbonate Glazing

with 4mm TwinWall Polycarbonate Glazing (70903)

Polycarbonate is a virtually unbreakable material, better described as being a highly durable, twin-wall, opaque coloured plastic glaze rather than actual glass. This makes it the safest material where children and pets are concerned and the simplest type to install due to the large yet lighter panes. It also refracts the light very well.
  • 17% Off
  • Save £260.00
£1,499.00 £1,239.00

Option 2 > Base Plinth?

with Matching GREEN Base Plinth

with Matching GREEN Base Plinth (SO8319)

Add a matching steel base plinth to your order.
Image for demonstration only and base colour/style may vary depending on your chosen model.
  • 17% Off
  • Save £29.01
£169.00 £139.99

Option 3 > Ventilation?

with Matching Louvre Window

with Matching Louvre Window

A Halls louvre window with matching glazing. Louvre windows replace one or more standard glass panes to aid with ventilation in the side of your greenhouse. Note: Louvre blades may differ between 5 or 6 blades depending on the greenhouse model. Image for demonstration only.
  • 29% Off
  • Save £28.00
£97.99 £69.99
with Automatic Louvre Window Opener

with Automatic Louvre Window Opener (70959)

When used in conjunction with a Halls Louvre Window, this device can be pre-set to open the window as and when needed when the temperature reaches a certain degree.
  • 36% Off
  • Save £17.00

Sold Out

with Additional Matching Roof Vent

with Additional Matching Roof Vent

Add an additional Roof Vent which will aid temperature and humidity control inside your greenhouse.
  • 31% Off
  • Save £18.00
£57.99 £39.99
with Halls Automatic Vent Opener (VentoMatic)

with Halls Automatic Vent Opener (VentoMatic) (70182)

The Ventomatic is an automatic solar-powered window-opener. It's able to open and close a roof vent within a range of 16 - 25 degrees celsius. One Ventomatic will be required per Vent.
  • 38% Off
  • Save £17.00
£44.99 £27.99

Option 4 > Greenhouse Installation?

with Greenhouse Installation

with Greenhouse Installation

If you would like the Halls installation team to install your Greenhouse on a prepared surface, this can easily be arranged!
£550.00
with Staging or Shelving Installation

with Staging or Shelving Installation

Please tick the check box if you require Staging or Shelving Installation at the same time as your greenhouse. Change the Qty box if you require more than one to be installed.
£26.00

Option 5 > Delivery Options

with Delivery to Mainland England, Wales, Scotland & Northern Ireland

with Delivery to Mainland England, Wales, Scotland & Northern Ireland


STANDARD INCLUSIVE DELIVERY of your greenhouse within Mainland England, Wales, Scotland and Northern Ireland. Excludes any Offshore Islands.
with Delivery to Isle of Wight/Man and Scottish Islands

with Delivery to Isle of Wight/Man and Scottish Islands


Our extended delivery service if you wish to have your greenhouse delivered to the Isle of Wight, Isle of Man and Scottish Islands.



£99.99
with Delivery to Republic of Ireland, Jersey or Guernsey

with Delivery to Republic of Ireland, Jersey or Guernsey


Our extended delivery service if you wish to have your greenhouse delivered to Republic of Ireland, Jersey or Guernsey.



£124.99

Accessories > Staging, Shelving and Work Benches

with Halls 1 Tier GREEN Staging

with Halls 1 Tier GREEN Staging (70134)

A 120cm wide free-standing staging unit with one tier.
  • 27% Off
  • Save £20.00

Sold Out

with Halls 2 Tier GREEN Staging

with Halls 2 Tier GREEN Staging (70128)

A 120cm wide free-standing staging unit with two tiers.
  • 23% Off
  • Save £24.00

Sold Out

with Halls 4 Foot GREEN Top Extension Staging

with Halls 4 Foot GREEN Top Extension Staging (70131)

Add an extra shelf to your staging with this top extension piece.
  • 31% Off
  • Save £18.00

Sold Out

with Halls 1 Tier ALUMINIUM Staging

with Halls 1 Tier ALUMINIUM Staging (SO1708)

A 120cm wide free-standing staging unit with one tier.
  • 31% Off
  • Save £20.00

Sold Out

with Halls 2 Tier ALUMINIUM Staging

with Halls 2 Tier ALUMINIUM Staging (SO1709)

A 120cm wide free-standing staging unit with two tiers.
  • 29% Off
  • Save £27.00

Sold Out

with Halls 4 Foot ALUMINIUM Top Extension Staging

with Halls 4 Foot ALUMINIUM Top Extension Staging (70137)

Add an extra shelf to your staging with this top extension piece.
  • 39% Off
  • Save £16.00

Sold Out

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

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

These popularly priced, yet ever so practical pair of Aluminium shelves come complete with fixing brackets which enables you to easily install the shelves onto your greenhouse frame. Each shelf is 2ft 10ins in length, 6ins wide and 2ins deep.
  • 33% Off
  • Save £17.00

Sold Out

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

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

These popularly priced, yet ever so practical pair of Aluminium shelves come complete with fixing brackets which enables you to easily install the shelves onto your greenhouse frame. Each shelf is 4ft 10ins in length, 6ins wide and 2ins deep.
  • 26% Off
  • Save £19.00
£73.99 £54.99
with Halls Potting Bench

with Halls Potting Bench (70684)

A two-tier potting bench featuring an open tray compost tidy on the top for potting. Length 595mm x Width 560mm x Height 1040mm.



  • 31% Off
  • Save £22.00

Sold Out

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

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

A 5 foot long, 10 inch wide Wire Shelf, suitable for creating a workspace for pots, seedling trays and keeping your small tools handy. Comes complete with brackets to attach to your greenhouse frame.
  • 30% Off
  • Save £17.00

Sold Out

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

with Halls 5ft Long (20ins Wide) Wire Shelf (F04504)

A 5 foot long, 20 inch wide Wire Shelf, suitable for creating a workspace for pots, seedling trays and keeping your small tools handy. Comes complete with brackets to attach to your greenhouse frame.
  • 27% Off
  • Save £20.00
£74.99 £54.99
with Halls 3 Tier Seed Tray Unit and 15 Trays

with Halls 3 Tier Seed Tray Unit and 15 Trays (70686)

This 3 shelf seed tray tidy will ensure that you can make the most out of the space you have, with 15 standard sizes seed trays. Length 1180mm x Width 400mm x Height 1120mm.

  • 32% Off
  • Save £23.00

Sold Out

Accessories > Water Systems?

with Water Butt & Stand

with Water Butt & Stand

A 100-litre water butt with lockable lid for security, water exit tap and stand.
  • 40% Off
  • Save £20.01
£50.00 £29.99
with Matching Rainwater Downpipe Kit

with Matching Rainwater Downpipe Kit

The downpipe kit slots into your greenhouse guttering to channel water downwards, normally into a water butt or container (supplied separately). Two will be needed if you wish to capture water from both sides of a freestanding greenhouse, or one set for a lean-to model.
  • 40% Off
  • Save £10.01
£25.00 £14.99
with Gravity Vanlet Irrigation Kit

with Gravity Vanlet Irrigation Kit (F04201)

The Halls Vanlet is a gravity fed automated drip irrigation system that can be used to distribute water and/or fertilizer. The unit includes: Vanlet Tank, 30 Drip Pins, 35 Y Connectors, 25 metres of Transport Hose and a Fitting Bracket.
  • 25% Off
  • Save £26.00
£105.99 £79.99
with Solar Automatic Irrigation Kit

with Solar Automatic Irrigation Kit (E05114)

Designed to be used with a water butt so there's no need for a water supply connection, the Solar Irrigation Kit waters your plants up to three times a day and automatically increases the amount during warmer weather. Comes complete with solar panel unit, hose, pips and drippers, letting you reuse captured rainwater and the power of the sun to automatically water your crops economically!
  • 23% Off
  • Save £27.00
£116.99 £89.99

Accessories > Plant Care

with Plastic Plant Rings (20 Pack)

with Plastic Plant Rings (20 Pack) (F04711)

A pack of plastic rings, suitable for attaching to your greenhouse frame, allowing you to attach tie supports for your plants.
  • 20% Off
  • Save £2.00
£9.99 £7.99
with Plants Spirals (3 Pack)

with Plants Spirals (3 Pack) (F04905)

They easily hang from the roof of your greenhouse using the hanging clips provided, they can then be extended downwards to the perfect height to offer support for tall growing plants.
  • 43% Off
  • Save £15.00
£34.99 £19.99
with Solar LED Lamp

with Solar LED Lamp (F04841)

A solar-powered lamp with a bracket to easily attach to the framing of your greenhouse. Suitable for Indoor or Outdoor use.
  • 38% Off
  • Save £6.00
£15.99 £9.99
with Shading Blinds (Pack of Two)

with Shading Blinds (Pack of Two) (E05119)

A pair of black blinds which are easily suctioned onto a pane of glass within your greenhouse, providing shade to a select area inside.
  • 37% Off
  • Save £13.00

Sold Out

with Halls 8ft (250cm) Shading Screen

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

Shading kits are perfect for keeping part of the Sun's heat from making the inside too hot. 2.59m Long and 1.80m Wide. Sufficient to shade one side of a 8x6 Greenhouse.
  • 30% Off
  • Save £15.00
£49.99 £34.99
with Paraffin Heater

with Paraffin Heater (F04453)

Ideal for the colder months, this paraffin heater will help to keep the inside of your greenhouse frost-free. Suitable to use with either lamp oil or perfume-free petroleum. Capacity: 4.4L Burn Time: 18 Hours approx.
  • 31% Off
  • Save £25.00
£79.99 £54.99
with Pot Holder

with Pot Holder (F04842)

A pot holder which easily slots onto the frame of your greenhouse, allowing 14cm diameter pots, up to 10kgs in weight to be held onto the frame, making use of the space inside of your greenhouse for even more growing space. (Pot not included)
  • 38% Off
  • Save £6.00
£15.99 £9.99
with Min/Max Thermometer

with Min/Max Thermometer (F04353)

An internal thermometer for your greenhouse, letting you keep an eye on the temperature inside. It also includes a max/min setting which shows you when the temperature of the greenhouse is at it's highest or lowest point.
  • 31% Off
  • Save £8.00
£25.99 £17.99
with Tablet Holder

with Tablet Holder (F04849)

Simply slotted into the frame of your greenhouse, a touchscreen tablet can easily be placed in the holder, providing music or playing instructional videos while you pot and sow hands-free. (Tablet not included.)
  • 38% Off
  • Save £9.00
£23.99 £14.99

Your Selected Options:

  • with Horticultural Glazing
  • with Delivery to Mainland England, Wales, Scotland & Northern Ireland

£914.00 inc. VAT

Delivery Information

Important Covid-19 Update - Thursday 28th May 2020

Delivery timeframes have been extended to up to 30 weeks due to carrier restrictions during Covid-19 and excessive demand.

Fast Free Delivery within Mainland UK & Northern Ireland.
Delivery is within 10 - 14 working days, but may be slightly longer to Highlands and Northern Ireland.

Delivery Period
Delivery will typically be made within 10 - 14 working days but may be extended during busy times of the year. For larger products, the carrier will call and book in a convenient delivery date. For other products, a delivery date will be provided by email from the carrier, which will include a link to allow tracking online.

Vehicles We Use
Items will be delivered on larger lorries which can get to most places it's typically, a 15 ton lorry which is about the size of a dustbin lorry, this will depend on the item that is being delivered and should you have any concerns with restricted access to your property we ask you to contact us prior to placing an order.

Unloading Of Your Delivery
Due to the nature of this product, delivery will be made to the front of the property to the nearest location. Our drivers will not carry these items inside your home or back garden. When the item is delivered on a pallet, the pallet and packaging are non-returnable. Goods can only be manoeuvred on a flat and level surface (i.e. not a gravel driveway) by a pallet truck. On some occasions the driver will split the package to assist with manoeuvring of the item. Once you are happy, we will ask you to check the condition of the goods and sign for the delivery.

Customer Reviews

Overall Rating 4.9 / 5 Based On 4 Reviews

Price 5 / 5
Quality 5 / 5
Delivery 5 / 5

Excellent Product - Excellent Service

A really, really nice greenhouse, well made and all went together as it should. We've had a couple of guys working working on our major rebuild project for almost two years and they started life many years ago erecting greenhouses for a company. They put this green Magnum up for us and were impressed with everything - no missing bits, no parts that don't fit - in fact none of the problems you so often get with items such as this. Given that we ordered just as Corvid forced the country to a standstill, we had delivery (with a very helpful delivery driver - on time and really careful )not too far outside the normal period, so well done to all concerned. All in all a very nice experience all round and it looks brilliant. Thank You!

By Mike Weatherstone, on 02nd, May, 2020

Delivery 4 / 5
Quality 5 / 5
Price 5 / 5

Magnum Greenhouse

Was delivered while I was out because there was no message of delivery date. Very nice and well made greenhouse, looks great now it is installed, but it took me a few weeks because of the bad weather and being away for a while. The photos in the manual could be a bit sharper and larger because they are difficult to see clearly and there needs to be more information on fitting to a concrete base without the Halls metal base. I am very pleased with it and would recommend this company to others. I found two panes of glass cracked and Halls refunded the money for the replacements.

By Paul Marfleet, on 21st, November, 2019

Delivery 5 / 5
Quality 5 / 5
Price 5 / 5

Looks larger close-up

so far so good my son-in-law erecting it on his own still glass to insert but very sturdy and TALLLLLLLLLL!!!! glad i bought automatic openers as i can't reach to top windows due to illness. it is going to look great

By Martin Ingram, on 28th, February, 2018

Price 5 / 5
Quality 5 / 5
Delivery 5 / 5

Magnum Greenhouse

Greenhouse was delivered last Thursday and left on the drive as we had not received a message regarding delivery and were out. Following a telephone call to Halls who were very apologetic on behalf of the transporters and offer us some greenhouse staging in way of compensation. Halls were very professional when contacted, I would not hesitate to recommend them

By Terry Searing, on 26th, July, 2016

Review This Product
Questions and Answers (1)
Jo Donaldson Asked:

I would like to just buy the frame. Is this possible?

We Replied:

Dear Jo Thank you for your question. I am sure we can get a frame only price for you. We will e-mail this separately to you. So we get the quotation correct first time please e-mail FAO Dan at helpdesk@gardensite.co.uk and list any other lines you require; base, staging, autovent etc. and we will get a quote back to you. Please include your post code. Copy in your question and my reply. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. kind regards Robert Hall

Friday 21st, March, 2014

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