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10x20 Janssens Master Greenhouse

10x20 Janssens Master Greenhouse
Delivery: Within 8-16 weeks ⛟ Click to enlarge - For illustration purposes.
Janssens 8x10 Helios Master Hobby Greenhouse
Janssens Helios Master Hobby Greenhouse
Janssens 10x15 Helios Master Hobby Greenhouse
Janssens-Greenhouses-Louvre-Window
Janssens Downpipe Profile
Janssens Greenhouses Profile Cross Section Helios Ridge
Janssens Helios Corner Post Profile
Janssens Greenhouses Profile Cross Section Helios Base
Janssens Helios Gutter Profile
Janssens Helios Glazing Bar Profile
Quick Code: P172866
Greenhouse Size Diagram

Greenhouse Dimensions

A: Greenhouse width

3100mm (10′ 2″)

B: Greenhouse depth

6060mm (19′ 11″)

C: Ridge height

2740mm (9′)

D: Eaves height

2010mm (6′ 7″)

E & F: Door Size

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

Minimum Base Size

3100mm (10′ 2″) x 6060mm (19′ 11″)

Toughened Glass Glazing

Toughened glass, also known as tempered glass, is a high-strength and durable glazing material that is ideal for greenhouses. It undergoes a special heat treatment process that enhances its resistance to impact, making it less likely to break or shatter. In the rare event of breakage, toughened glass crumbles into small, granular pieces, reducing the risk of injury. Gardeners and plant enthusiasts value toughened glass for its safety, longevity, and ability to provide a clear and well-lit environment for optimal plant growth.

sku:MH36

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Urban Models - Within 8 weeks

Master Models - Within 10-12 weeks

All other Models - Within 16 weeks

  • 3100mm x 6060mm Dimensions (10ft 1” x 19ft 8”)
  • 2m High Eaves
  • Aluminium Frame with Tubular and Box Section for Superior Strength.
  • Box Section Base Plinth.
  • Double Sliding Door.
  • 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.

The 10ft x 20ft Janssens Helios Master Greenhouse is the largest in the range, and a superb example of a greenhouse ideal for domestic or commercial use. At 10ft Wide it`s really practical. Then add in the 20ft length and you have a greenhouse for the serious gardener or grower.4mm Toughened Glass is held in by rubber glazing gasket, making it very wind resistant and safe for the garden or business environment.

All Janssens Master 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!

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

1: Select your Size

2: Select your Frame Colour

3: Recommended Accessories Discount Pack (15% OFF)

Janssens Silver Full Length Integrated Staging
Janssens Silver Full Length Integrated Staging
£20 OFF
+ £115
Janssens Silver Integrated Staging
Janssens Silver Integrated Staging
£12 OFF
+ £68
Auto Roof Vent Opener
Auto Roof Vent Opener
£6 OFF
+ £33
Kit:(Janssens Silver Full Length Integrated Staging + Janssens Silver Integrated Staging + Auto Roof Vent Opener)

Save on our recommended accessories kit for this greenhouse.

£38.00 OFF!!
Bundle Price +£216

Click to Add

6: Staging

Janssens Silver Full Length Integrated Staging
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

+ £135
Qty 1
Click to Add
Janssens Seed Tray Shelving
Janssens Seed Tray Shelving

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

+ £250
Qty 1
Click to Add
1 Tier Staging Silver
SAVE £10 13%OFF
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)

+ £69
Qty 1
Click to Add
Janssens Integrated Silver Shelving
Janssens Integrated Silver Shelving

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

+ £40
Qty 1
Click to Add
2 Tier Staging Silver
SAVE £11 11%OFF
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)

+ £88
Qty 1
Click to Add
Top Tier Staging Extension Silver
SAVE £10 17%OFF
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

+ £49
Qty 1
Click to Add
Janssens Silver Integrated Staging
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
Click to Add

7: Ventilation and Shading

Auto Roof Vent Opener
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
Click to Add
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
Click to Add
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
Click to Add
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
Click to Add
Janssens Sunscreen Shading
Janssens Sunscreen Shading

Add the Janssens retractable shading kit for ease of use

+ £175
Click to Add

8: Extras

Hygrometer
Hygrometer

This Hygrometer will measure the humidity levels inside your greenhouse.

+ £17
Click to Add
Soil Thermometer
Soil Thermometer

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

+ £29
Click to Add
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.

+ £23
Click to Add
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
Click to Add

9: Greenhouse Installation

For peace of mind, why not your new greenhouse installed by a certified greenhouse installer.

Please Note: installation can only be carried out using the Optional Base Plinth (if available) onto a flat level surface such as slabs, concrete or decking that is to the Minimum base size stated in the dimensions diagram. Installation is for the Greenhouse, the fitting of downpipes, autovents, louvres, roof vents and cresting only and does not include groundworks, staging, accessories.

Greenhouse Installation
Greenhouse Installation

We are currently able to offer installation in the following postcodes:

B, BA, BB, BD, BL, BN, BS, CA, CB, CH, CO, CR, CT, CV, CW, DA, DE, DG, DH, DL, DN, DY, EH, GL, GL, GU, HD, HG, HP, HU, HX, IP, KA, KT, L, LA, LE, LL, LN, LS, M, ME, MK, ML, NE, NG, NN, NR, OL, OX, PE, PR, RG, RH, S, SE, SG, SK, SM, SN, ST, SW, SY, TD, TF, TN, TS, TW, WA, WF, WN, WR, WS, WV, YO.

Please Note: installation can be 2-4 weeks after your delivery time.

+ £1,275
Click to Add
Staging/Shelving Assembly
Staging/Shelving Assembly

Please Note, Only Available with Optional Greenhouse Installation.If you've ordered optional installation but don't want to put your staging together, choose this option and let our team assemble it for you.(Price is per Staging).

+ £85
Qty 1
Click to Add

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10x20 Janssens Master Greenhouse

£5,340