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8x17 Janssens Modern Pent Roof Greenhouse

  • 7ft 8" wide x 17ft 5" deep
  • Aluminium Frame with Tubular and Box Section for Strength.
  • Green, White or Black Powder Coated Frame.
  • Double Sliding Doors.
  • 4mm Full Length Toughened Safety Glass.
  • 3 x Roof Vents.
  • 2 x Hinged Side Vents
  • 13 Year Warranty.
Greenhouse Size Diagram

Greenhouse Dimensions

A: Greenhouse width

2360mm (7′ 8″)

B: Greenhouse depth

5312mm (17′ 5″)

C: Ridge height

2700mm (8′ 10″)

D: Eaves height

2040mm (6′ 8″)

E & F: Door Size

1400mm (4′ 7″) x 2000mm (6′ 6″) (aperture)

Minimum Base Size

2360mm (7′ 8″) x 5312mm (17′ 5″)

Customise your Greenhouse

More Sizes:

Choose your Colour

Black Powder Coated Frame
+ £0

Green Powder Coated Frame
+ £0

White Powder Coating
+ £0

Choose your Colour information

Black Powder Coated Frame - £0.00
Black Powder Coated Frame

Green Powder Coated Frame - £0.00
Green Powder Coated Frame

White Powder Coating - £0.00
White Powder Coating

Add Staging?

Qty 1
Janssens Colour Matched Full Length Integrated Shelving
+ £195

Add the Silver 458cm long x 23cm wide integrated shelving to your greenhouse to help retain your floor space

Qty 1
Qty 1
Janssens Colour Matched integrated Staging
+ £110

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

Qty 1
Janssens Seed Tray Shelving
+ £420

Add the Silver Full Length long Seed Tray Shelving to your greenhouse to help retain your floor space

Qty 1
£10 off
£10 off
1 Tier Staging Silver
+ £69

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

Qty 1
£11 off
£11 off
2 Tier Staging Silver
+ £88

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

Qty 1
£10 off
£10 off
Top Tier Staging Extension Silver
+ £49

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

Qty 1

Staging information

Janssens Silver Full Length Integrated Shelving - £149.00
Janssens Silver Full Length Integrated Shelving

Add the Silver Full Length 458cm long x 23cm Wide integrated shelving to the side of your greenhouse to help retain your floor space


Janssens Colour Matched Full Length Integrated Shelving - £195.00
Janssens Colour Matched Full Length Integrated Shelving

Add the Silver 458cm long x 23cm wide integrated shelving to your greenhouse to help retain your floor space


Janssens Silver Integrated Staging - £95.00
Janssens Silver Integrated Staging

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


Janssens Colour Matched integrated Staging - £110.00
Janssens Colour Matched integrated Staging

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


Janssens Seed Tray Shelving - £420.00
Janssens Seed Tray Shelving

Add the Silver Full Length long Seed Tray Shelving to your greenhouse to help retain your floor space


1 Tier Staging Silver - £69.00
1 Tier Staging Silver

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


2 Tier Staging Silver - £88.00
2 Tier Staging Silver

This 2 Tier Vitavia silver 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 Silver - £49.00
Top Tier Staging Extension Silver

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


Add Ventilation and Shading?

Qty 1
Louvre Vent
+ £165

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

Qty 1

Ventilation and Shading information

Auto Roof Vent Opener - £75.00
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.


Louvre Vent - £165.00
Louvre Vent

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


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

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


Add Extra Set of Doors?

Hinged Double Door
+ £999

Add a set of hinged double doors to your greenhouse

Qty 1
Single Hinged Door
+ £530

Add a Single Hinged Door to your greenhouse

Qty 1
Double Sliding Door
+ £485

Add a set of Double Sliding Doors to your Greenhouse

Qty 1
Single Sliding Door
+ £235

Add a Single Sliding Door to your greenhouse

Qty 1

Extra Set of Doors information

Hinged Double Door - £999.00
Hinged Double Door

Add a set of hinged double doors to your greenhouse


Single Hinged Door - £530.00
Single Hinged Door

Add a Single Hinged Door to your greenhouse


Double Sliding Door - £485.00
Double Sliding Door

Add a set of Double Sliding Doors to your Greenhouse


Single Sliding Door - £235.00
Single Sliding Door

Add a Single Sliding Door to your 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.

Pick from a green, white 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, White or Black Powder Coated Frame.
  • Box Section Base Plinth.
  • Double Sliding Doors
  • 4mm Full Length Toughened Safety Glass
  • 3 x 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 Size Diagram

Greenhouse Dimensions

A: Greenhouse width

2360mm (7′ 8″)

B: Greenhouse depth

5312mm (17′ 5″)

C: Ridge height

2700mm (8′ 10″)

D: Eaves height

2040mm (6′ 8″)

E & F: Door Size

1400mm (4′ 7″) x 2000mm (6′ 6″) (aperture)

Minimum Base Size

2360mm (7′ 8″) x 5312mm (17′ 5″)

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.