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8x17 Janssens Modern Pent Roof Greenhouse

8x17 Janssens Modern Pent Roof Greenhouse
Delivery 4-16 weeks ⛟
Click to enlarge - For illustration purposes.

Quick Code: P172991

SAVE £50 EXTRA

Pay ONLY £9349 TODAY!

Use code JANSS50 at checkout
  • 2.7m High Ridge Height
  • 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.
  • 13 Year Manufacturers Warranty.

Greenhouse Dimensions

Greenhouse Size Diagram
  • A: 2360mm (7ft 9")
  • B: 5312mm (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

Customise your Greenhouse

More Sizes:

+5 more sizes, click to see all

Select your Colour:

Add Add a 73cm/2ft Extension?

2ft Extension section
+ £425

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

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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
+ £

Black Powder Coated Frame
+ £

Choose your colour information

Green Powder Coated Frame - £
Green Powder Coated Frame

Black Powder Coated Frame - £
Black Powder Coated Frame

Add Door Options?

Hinged Double Door
+ £1,100

Add a set of hinged double doors to your greenhouse

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Single Hinged Door
+ £495

Add a Single Hinged Door to your greenhouse

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Double Sliding Door
+ £475

Add a set of Double Sliding Doors to your Greenhouse

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Single Sliding Door
+ £190

Add a Single Sliding Door to your greenhouse

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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?

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Janssens Colour Matched Seed Tray Shelving
+ £295

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

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£15 off
1 Tier Staging Colour Matched
+ £74

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)

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Janssens Integrated Colour Matched Shelving
+ £55

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

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£23 off
2 Tier Staging Colour Matched
+ £96

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)

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£10 off
Top Tier Staging Extension Colour Matched
+ £49

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

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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

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

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Curtain Shading
+ £27

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

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Janssens Sunscreen Shading
+ £129

Add the Janssens retractable shading kit for ease of use

Janssens Roof Vent
+ £95

Add roof ventilation to your greenhouse to help moderate the temperature

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Janssens Side Vent
+ £320

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

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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.


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

This Hygrometer will measure the humidity levels inside your greenhouse.

Soil Thermometer
+ £29

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

Max/Min Thermometer
+ £23

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

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

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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 5312mm 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: If selected, Installation will be carried out 1-8 weeks after the delivery of your Greenhouse. The Installation Team will contact you directly to book in your installation.Our installation service requires a level concrete, slabbed, or decked area to the minimum size stated on the website. Failure to provide a suitable base area may result in you being charged for the failed installation. If you require staging or shelving assembly, you can arrange it directly with the installation team.

Greenhouse Dimensions

Greenhouse Size Diagram
  • A: 2360mm (7ft 9")
  • B: 5312mm (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.

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