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  • Western Red Cedar
  • Extremely strong frame
  • Toughened safety glass (full sheet)
  • Sliding door(s)
  • Free 10 Year Guarantee
  • 4 x Roof vents (automatic opening)
  • 2 x Louvre vents
  • Guttering and Downpipe(s)
  • Low level threshold
  • Screw in cedar bar capping system
  • Installation available for a fee
Delivery in 3 - 4 weeks
Delivery Information

Delivery of this greenhouse to Mainland England and Wales is FREE, parts of Scotland may be subject to a small charge. Delivery costs will be calculated and displayed at checkout before any payment is required You will be contacted with a delivery date when your greenhouse is ready. This greenhouse is delivered straight from the factory on dedicated transport. Please write in the comments box at checkout any dates (holidays etc.) you would like us to avoid. Delivery to Northern Ireland may take longer.




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  • Alton 10 moss hanging basket brackets

    More information
    £ 29.00
    Alton 10 moss hanging basket brackets

     10 x Hanging basket bracket (10 pack) with a moss finish to suit Alton Evolution greenhouses.

  • Alton 4 slat 25 inch wide Aluminium Staging Moss 12ft

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    £ 520.00
    Alton 4 slat 25 inch wide Aluminium Staging Moss 12ft

    -Wheelchair friendly

    - Extend to any length
    - Height adjustable
    - No legs
    The 'no-legs'Cantilever set up means you can use the floor under the staging effectively for heavy pots or bags of compost without cluttering your main path.
  • Alton 6 Slat Louvre moss

    More information
    £ 227.00
    Alton 6 Slat Louvre moss

    Fitting neatly into the side panes of your greenhouse, Robinsons louvre vents provide valuable extra ventilation to help ensure healthier plants & produce. 


    The photo shows an optional auto louvre opener (extra cost), as standard the louvre comes with handle to open and close the vent.
  • Alton Bar Capping set Moss Green for Evolution Six 12ft

    More information
    £ 370.00
    Alton Bar Capping set Moss Green for Evolution Six 12ft
  • Alton Cedar Potting Tray

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    £ 89.00
    Alton Cedar Potting Tray

    Alton potting trays are made from the same red western cedar as Alton Greenhouses. They are sturdy and built to last.

    Measuring 650mm wide x 500mm long x 210mm high at the back, fitting neatly onto your staging.

  • Alton Evolution auto louvre opener

    More information
    £ 45.00
    Alton Evolution auto louvre opener

    Automatic attachment for a Louvre vent, fits most louvres.  Its fully adjustable to open over a range of temperatures.

    Some drilling is required to fit.


    Please note that an auto louvre can NOT fit a louvre which is directly left of an a-frame when you look at it internally without extra packing. 

  • Alton Evolution Cresting Moss 12ft

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    £ 480.00
    Alton Evolution Cresting Moss 12ft

    Cresting and finials made from solid cast aluminum

  • Alton Evolution Internal roof shading blind

    More information
    £ 136.00
    Alton Evolution Internal roof shading blind

    Designed to fit all Alton brand rectangular greenhouses. Not suitable for octagonal greenhouses.

    Alton Evolution Internal roof shading blinds can be used to protect plants from strong sunlight or to provide insulation over winter. The flexible nature of the fabric will allow automatic roof vents to operate without interference. 

    1 Year manufacturers warranty. 
  • Alton Extra Evolution door on plain end

    More information
    £ 499.00
    Alton Extra Evolution door on plain end

    An extra end door will allow access to both ends of the greenhouse. Your greenhouse will automatically be adjusted so no extra work at the time of installation is required to fit the second door. 

  • Alton Extra Evolution Roof Vent With Auto Opener

    More information
    £ 158.00
    Alton Extra Evolution Roof Vent With Auto Opener
  • Osmo UV Protection Oil Extra 2.5l

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    £ 95.00
    Osmo UV Protection Oil Extra 2.5l

    One of the most regular questions that we get asked is how to care for your new summerhouse - in particular what to treat it with.

    In many ways, this can be a matter of personal opinion: Some people prefer to let the cedar fade down to its natural silvery-grey colour. A new building will begin this mellowing process as soon as it is assembled and will be noticeable after just a few weeks and will be quite silver after a year. If you like this mellow look then you can re-apply the same treatment that we use in the factory - a clear Barrattine wood protector formula every couple of years. This helps to prolong the life of the wood and reduces staining but does not alter the mellowing process. This treatment is easy to just use when needed

    If you would really prefer to try and keep the original cedar colour in the wood then we can recommend using this Osmo oil product on new Summerhouses and Greenhouses as it prolongs the colour of new cedar by protecting it from Uv light. It is quite a viscous product so needs to be applied with a brush and will need 2-3 coats for best results.

    This high-quality product is in effect a sun block for your wooden building. A 2.5l tin will be enough to coat a 6’x8’ summerhouse building approximately four times. Due to the effectiveness of this product, your building may only need treating every couple of years. Only the exterior of your building will require treating.

    IMPORTANT: In the case of a summerhouse; we recommend using this product a couple of weeks after construction. This will ensure that the cedar has had time to air-dry but has not yet started to fade. In the case of a greenhouse, it is better to coat the individual parts whilst the greenhouse is flat packed before assembly. Bear in mind that you will need multiple coats and there is a long drying time.

    Osmo uv-protection-oil extra is a satin, Clear finish for exterior. It is based on natural oils, is microporous, and does not crack, flake, peel or blister. Osmo uv-protection-oil extra prolongs the renovation time significantly. As a stand alone finish, with two coats, It prolongs the greying process on vertical surfaces by up-protection factor 12 compared to untreated wood. The finish contains active ingredients which protect it from mould, algae and fungal attack. Easy to renew, no sanding or primer necessary. Easy to apply, will not dry during application.

  • Alton Shelf 1ft wide 12ft Long Moss

    More information
    £ 370.00
    Alton Shelf 1ft wide 12ft Long Moss
    - Wheelchair friendly
    - Extend to any length
    - Height adjustable
    - No legs
    2 slat (12") wide Aluminium Shelf (Moss)
    The 1ft wide high level shelf adds vital extra storage space in the greenhouse and helps you to create a most efficient set-up.
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N.b. This greenhouse comes with Cedar bar cover capping as Standard. Aluminium cover capping in the moss colour is an optional upgrade. Gutters, base, and other aluminium components come in moss powder coated aluminium  as standard.

The clever design of these new Alton Evolution models has created a cedar greenhouse that is ideal for modern needs, and by using innovative and strong jointing technology, the Evolution models are delivered flat packed in a self-assembly format. This removes a large amount of cost from the double handling and storage of large unwieldy glazed panels used on other models, and put simply this allows us to put more wood into the greenhouse. 

The result is an extremely strong, high quality cedar greenhouse, designed to be maintenance free- even with the standard cedar bar capping. If you upgrade to the moss coloured aluminium bar capping system you will combine all the benefits of cedar and all the advantages of Aluminium in one hybrid greenhouse. 

The best type of wood - and more of it!

The frame is made from Canadian Western Red Cedar, which is extremely high in natural preservative oils which, even without further artificial treatment, make it virtually immune from decay. Cedar also has a unique subtle aroma which can deter pests. The frame is based on mostly planed 2x2 (44x44mm) and 3x2 (69x44mm)

We factory treat your Alton Evolution greenhouse in a clear treatment - thus not masking the natural colour variation of the cedar wood. In time, your greenhouse will mellow into a silvery colour which is so distinctive to cedar. The Moss colour of the metal components is designed to blend in perfectly with this mature silvery colour.

- A metal base keeps the wood well away from the damp area on the floor

- Louvres and Automatic roof vents are standard.

-  High Eaves - often overlooked by greenhouse buyers, but it is important to consider. High eaves means the greenhouse feels a lot bigger, and it is far more comfortable for you to work in.

- The guttering and downpipes are included as standard.

- Glass overlaps at eaves, protecting a vulnerable area of your greenhouse from rot.


Greenhouse dimensions diagram
  • A = Base width: 1,987mm (6ft6).
  • B = Length: 3,866mm (12ft8).
  • C = Eaves height: 1,700mm (5ft6).
  • D = Ridge height: 2,227mm (7ft3).
  • E = Door width: 560mm (1ft10).
  • F = Door height: 1,890mm (6ft2).
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File Type: PDF

6 x 12 Alton Evo Dimensions - Click here to view

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File Type: PDF

Alton Evolution Six greenhouse instructions - Click here to view

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Delivery of this greenhouse to Mainland England and Wales is FREE, parts of Scotland may be subject to a small charge. Delivery costs will be calculated and displayed at checkout before any payment is required You will be contacted with a delivery date when your greenhouse is ready. This greenhouse is delivered straight from the factory on dedicated transport. Please write in the comments box at checkout any dates (holidays etc.) you would like us to avoid. Delivery to Northern Ireland may take longer.




About The Greenhouse People

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The Greenhouse People offer a unique optional service that allows you to place an order to the value of £300 or more and we will call you back to take payment.