• Call to Order: 0800 098 8877

    0800 098 8877

    Advice & Blog

    £50 OFF Janssens!

    Use code JANSS50 in the basket min order £999 (Janssens)

    8x17 Janssens Modern Pent Roof Greenhouse

    The 8x17 Janssens Modern Pent Roof Greenhouse is the perfect building if you are looking for a lot more head height and practical growing space. The unique design makes the Modern a great place to relax with friends while making a striking statement in your garden. Not quite big enough, add a 2ft extension in the options below.

    More Sizes:

    Select your Colour:

    Add Add a 73cm/2ft Extension?

    2ft Extension section
    + £425
    Qty 1

    Add a 73cm/2ft Extension information

    2ft Extension section - £425.00
    2ft Extension section

    Not big enough? Extend the length of your Modern Greenhouse in 2ft/73cm increments.


    Choose your colour

    Green Powder Coated Frame
    + £0
    Black Powder Coated Frame
    + £0

    Choose your colour information

    Green Powder Coated Frame - £0
    Green Powder Coated Frame

    Black Powder Coated Frame - £0
    Black Powder Coated Frame

    Add Door Options?

    Hinged Double Door
    + £1,100
    Qty 1
    Single Hinged Door
    + £495
    Qty 1
    Double Sliding Door
    + £475
    Qty 1
    Single Sliding Door
    + £190
    Qty 1

    Door Options information

    Hinged Double Door - £1100.00
    Hinged Double Door

    Add a set of hinged double doors to your greenhouse


    Single Hinged Door - £495.00
    Single Hinged Door

    Add a Single Hinged Door to your greenhouse


    Double Sliding Door - £475.00
    Double Sliding Door

    Add a set of Double Sliding Doors to your Greenhouse


    Single Sliding Door - £190.00
    Single Sliding Door

    Add a Single Sliding Door to your greenhouse


    Add Staging?

    Qty 1
    Janssens Colour Matched Seed Tray Shelving
    + £295
    Qty 1
    £15 off
    1 Tier Staging Colour Matched
    + £74
    Qty 1
    Janssens Integrated Colour Matched Shelving
    + £55
    Qty 1
    £23 off
    2 Tier Staging Colour Matched
    + £96
    Qty 1
    £10 off
    Top Tier Staging Extension Colour Matched
    + £49
    Qty 1
    Qty 1

    Staging information

    Janssens Colour Matched Full Length Integrated Shelving - £145.00
    Janssens Colour Matched Full Length Integrated Shelving

    Add the Colour Matched Full Length 458cm long integrated shelving to the side of your greenhouse to help retain your floor space


    Janssens Colour Matched Seed Tray Shelving - £295.00
    Janssens Colour Matched Seed Tray Shelving

    Add the Colour Matched Full Width 310cm long Seed Tray Shelving to the rear of your greenhouse to help retain your floor space


    1 Tier Staging Colour Matched - £74.00
    1 Tier Staging Colour Matched

    This 1 Tier Vitavia Colour Matched greenhouse staging gives you a handy work surface and storage area. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)


    Janssens Integrated Colour Matched Shelving - £55.00
    Janssens Integrated Colour Matched Shelving

    Add the Colour Matched 150cm long x 23cm wide integrated shelving to your greenhouse to help retain your floor space


    2 Tier Staging Colour Matched - £96.00
    2 Tier Staging Colour Matched

    This 2 Tier Vitavia Colour Matched greenhouse staging gives you a handy work surface with additional low level storage. Dimensions: 76cm (H) x 50cm (D) x 120cm (W)


    Top Tier Staging Extension Colour Matched - £49.00
    Top Tier Staging Extension Colour Matched

    This little top level Colour Matched shelf attaches to 1 or 2 Tier staging to give you a bit more storage space


    Janssens Colour Matched Integrated Staging - £95.00
    Janssens Colour Matched Integrated Staging

    Add the Silver 150cm long x 53cm wide integrated staging to your greenhouse to help retain your floor space


    Add Ventilation and Shading?

    Auto Roof Vent Opener
    + £60
    Qty 1
    Curtain Shading
    + £27
    Qty 1
    Qty 1
    Auto Louvre Opener
    + £60
    Qty 1
    Janssens Sunscreen Shading
    + £129
    Janssens Roof Vent
    + £95
    Qty 1
    Janssens Side Vent
    + £320
    Qty 1

    Ventilation and Shading information

    Auto Roof Vent Opener - £60.00
    Auto Roof Vent Opener

    This automatic opener for your roof vents will automatically open your roof vents to ventilate your greenhouse when it becomes too hot.


    Curtain Shading - £27.00
    Curtain Shading

    Curtain shading will protect your plants from sun scorch and provide shade to moderate temperature. 6ft x 8ft.


    Louvre Vent - £130.00
    Louvre Vent

    A louvre window brings fresh cool air into your greenhouse to moderate the temperature inside. An essential add on.


    Auto Louvre Opener - £60.00
    Auto Louvre Opener

    This automatic opener mechanism will open your louvre window for you when you’re not around. No need to worry about ventilation, this does it automatically for you! (Does not include louvre window).


    Janssens Sunscreen Shading - £129.00
    Janssens Sunscreen Shading

    Add the Janssens retractable shading kit for ease of use


    Janssens Roof Vent - £95.00
    Janssens Roof Vent

    Add roof ventilation to your greenhouse to help moderate the temperature


    Janssens Side Vent - £320.00
    Janssens Side Vent

    Help recirculate the air in your greenhouse with a side vent or two!


    Add Extras?

    Hygrometer
    + £17
    Soil Thermometer
    + £29
    Max/Min Thermometer
    + £23
    100L Mini Rainsaver Water Butt
    + £54
    Qty 1

    Extras information

    Hygrometer - £17.00
    Hygrometer

    This Hygrometer will measure the humidity levels inside your greenhouse.


    Soil Thermometer - £29.00
    Soil Thermometer

    This Soil Thermometer will let you track the temperature of your soil inside the greenhouse.


    Max/Min Thermometer - £23.00
    Max/Min Thermometer

    This thermometer will tell you your maximum daytime temperature as well as record the lowest night time temperature in your greenhouse.


    100L Mini Rainsaver Water Butt - £54.00
    100L Mini Rainsaver Water Butt

    Add this 100L water butt kit that includes: Butt, Tap & Lid - Black Stand


    The 8x17 Janssens Modern Pent Roof Greenhouse is the perfect building if you are looking for a lot more head height and practical growing space. The unique design makes the Modern a great place to relax with friends while making a striking statement in your garden. Not quite big enough, add a 2ft extension in the options below.

    Pick from a green or black powder-coated finish to suit your garden or personal style preferences. Both Hinged and Sliding Double and Single Doors are available as options below to fully customise your greenhouse.

    All Janssens Modern Greenhouses are built around a strong box-section aluminium frame and base, with 4mm Toughened Glass held in with proper rubber glazing gasket to take on the worse of UK weather!

    • 2360mm x 5290mm Dimensions (7ft 9” x 17ft 2”)
    • 2.7m High Ridge Height
    • Aluminium Frame with Tubular and Box Section for Superior Strength.
    • Green or Black Powder Coated Frame.
    • Box Section Base Plinth.
    • Double Sliding Locking Doors
    • 4mm Full Length Toughened Safety Glass
    • 3 x Automatic Roof Vents
    • 2 x Hinged Side Vents
    • Rubber Glazing Gasket Strips (no fiddly clips)
    • Gutters and 40mm Aluminium Downpipes.
    • Stainless Steel Fittings.
    • Step by Step Instruction Manuals with Instructional DVD.
    • 13 Year Manufacturers Warranty.
    • Fully Customisable Door and Windows are available as Options below.
    • Many Accessories Available - Scroll down this page.

    Delivery is currently within 8 weeks for Urban Models, 10-12 Weeks for Master Models and 16 weeks for all other models to UK Mainland. Your exact delivery day will be confirmed with you at least 3 days before the day by telephone.

    Please note Some Scottish postal codes are subject to delivery charges.

    Optional Installation information: Installation will be carried out around 14-21 working days after delivery. Optional Installation will only be carried out on a surface of slabs or concrete and only with the recommended base plinth. You may be charged for accessories Installation is for the Greenhouse only and does not include staging, accessories etc

    Greenhouse Dimensions

    Greenhouse Size Diagram
    • A: 2360mm (7ft 9")
    • B: 5290mm (17ft 2")
    • C: 2700mm (8ft 10")
    • D: 2040mm (6ft 8")
    • E: 1400mm (4ft)
    • F: 2000mm (6ft 5")
    • Minimum size for your greenhouse base: 2360mm x 5290mm
    Toughened Safety Glass
    Toughened Safety Glass

    Our toughened safety glass offers superior clarity and durability. It's designed to break into small, less harmful pieces, providing enhanced safety for your greenhouse environment.

    Janssens Greenhouse
    Janssens Greenhouses

    Janssens Greenhouses were established in 1946 in Lier, Belgium and is now a super modern 6500sqm production facility equipped with the very latest high-tech automated machinery. Many years of production and the very latest design and manufacturing processes make a Janssens Greenhouse one of the best high end greenhouses you can buy today.

    Janssens Greenhouse 13 Year Warranty
    13 Year Warranty

    Janssens greenhouses come with a 10-year warranty on the greenhouse frame. This warranty covers any manufacturing defects in materials or workmanship. However, it does not cover glass or polycarbonate. The warranty is only valid if the greenhouse is assembled according to the provided instructions.