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Use code WEEKEND20 at checkout min order £499
(cabins, greenhouses)

17x17 Janssens Gigant Hobby Greenhouse

17x17 Janssens Gigant Hobby Greenhouse
Delivery: Within 8-16 weeks ⛟
Click to enlarge - For illustration purposes. Quick Code: P172947
Greenhouse Size Diagram

Greenhouse Dimensions

A: Greenhouse width

5310mm (17′ 5″)

B: Greenhouse depth

5310mm (17′ 5″)

C: Ridge height

3150mm (10′ 4″)

D: Eaves height

2040mm (6′ 8″)

E & F: Door Size

700mm (2′ 4″) x 2000mm (6′ 7″) (aperture)

Minimum size for your greenhouse base:

5310mm (17′ 5″) x 5310mm (17′ 5″)

Optional Greenhouse Base with Corner Posts

Place on hard or even SOFT GROUND!

Vitavia Green Corner Post

The usual golden rule when erecting a greenhouse is to place it on a hard and level surface so as to keep the greenhouse from twisting or becoming unstable over time.

If you want to install your greenhouse on soft ground then our optional Vitavia steel bases come with corner posts that you can bolt to the base. These posts are roughly 18 inches long and can be sunk into soil and then concreted in place once your greenhouse is level and square.

itavia Green No Corner Post

If you are intending to put your greenhouse on slabs or concrete then you simply don\'t attach the posts to the base, simple!

sku:GH55

£11,995

£20 EXTRA OFF this Weekend!

Use code WEEKEND20 at checkout min order £499
(cabins, greenhouses)

Check Delivery

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Urban Models - Within 8 weeks

Master Models - Within 10-12 weeks

All other Models - Within 16 weeks

  • 5310mm x 5310mm Dimensions (17ft 5" x 17ft 5")
  • 2m High Eaves
  • Aluminium Frame with Tubular and Box Section for Superior Strength.
  • Box Section Base Plinth.
  • Double Hinged Locking Doors - Outward Opening
  • 4mm Full Length Toughened Safety Glass
  • Rubber Glazing Gasket Strips (no fiddly clips)
  • 4x Roof Vents
  • 11 Blade Louvre Vent
  • Gutters and 40mm Aluminium Downpipes.
  • Stainless Steel Fittings.
  • Step by Step Instruction Manuals with Instructional DVD.
  • 13 Year Manufacturers Warranty.
  • Many Accessories Available - Scroll down this page.
  • Please call us for custom lengths.

The 17ft x 17ft Janssens Gigant Hobby Greenhouse will fit all of your professional growing needs perfectly. The vast growing area and super strong construction ensure that you can grow a variety of plants and vegatables year round.You'll get the strongest Aluminium greenhouse on the market with full modern box section construction, vital for weather resistance, especially in very strong storms and winds. Custom lengths are available in 2ft increments so we will have a size to suit all needs.

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

Can't find the size or specification to suit your needs?

Most Janssens Greenhouses are fully customisable.

Call us on 0800 098 8877 for your Free Quote!

Options: Click options to add them to your order then click "Buy Now"

1: Select your Size

3: Staging and Doors

Janssens Silver Full Length Integrated Staging Recommended
Janssens Silver Full Length Integrated Staging

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

+ £105
Qty 1
Janssens Silver Seed Tray Shelving
Janssens Silver Seed Tray Shelving

Add the Silver Full Width 458cm long Seed Tray Shelving to the rear of your greenhouse to help retain your floor space

+ £295
Qty 1
1 Tier Staging Colour Matched
SAVE £15 17%OFF
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)

+ £74
Qty 1
Janssens Integrated Colour Matched Shelving
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

+ £55
Qty 1
2 Tier Staging Colour Matched
SAVE £23 19%OFF
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)

+ £96
Qty 1
Top Tier Staging Extension Colour Matched
SAVE £10 17%OFF
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

+ £49
Qty 1
Janssens Silver Integrated Staging Recommended
Janssens Silver Integrated Staging

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

+ £80
Qty 1
Additional Double Hinged Door
Additional Double Hinged Door

Add more access points to your greenhouse with an additional set of double doors

+ £799
Qty 1

4: Ventilation and Shading

Auto Roof Vent Opener Recommended
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.

+ £39
Qty 1
Curtain Shading
Curtain Shading

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

+ £27
Qty 1
Louvre Vent
Louvre Vent

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

+ £79
Qty 1
Janssens Sunscreen Shading
Janssens Sunscreen Shading

Add the Janssens retractable shading kit for ease of use

+ £129
Auto Louvre Opener
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).

+ £40
Qty 1

5: Extras

Hygrometer
Hygrometer

This Hygrometer will measure the humidity levels inside your greenhouse.

Soil Thermometer
Soil Thermometer

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

Max/Min Thermometer
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
100L Mini Rainsaver Water Butt

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

+ £54
Qty 1

17x17 Janssens Gigant Hobby Greenhouse

£11,995