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Jansens Urban Greenhouses
Janssens Helios Urban 5x8 Greenhouse in Black

Janssens Helios Urban 5x8 Greenhouse in Black

Name: Janssens Helios Urban 5x8 Greenhouse in Black
Brand: Janssens
SKU: UV12BLK
Price: 2599.00 GBP
Availability: InStock

Delivery 4-16 weeks ⛟ Click to enlarge - For illustration purposes.

5x8 Janssens Helios Urban Victorian Greenhouse

Black Janssens Helios Urban Victorian Greenhouse

Janssens Helios Small Urban Victorian Greenhouse

Quick Code: P172856

SAVE £50 EXTRA

Use code JANSS50 at checkout

7ft 8" wide x 5ft 3" deep
4mm Full Length Toughened Safety Glass
Extra Strong Black Powder Coated Aluminium Frame
Single Sliding Door
11 Blade Louvre Vent
Includes Box Section Base Plinth
No Clip Rubber Glazing Gasket Strips
Gutters and 40mm Aluminium Downpipes
Stainless Steel Hardware
13 Year Manufacturers Warranty

Greenhouse Dimensions

A: Greenhouse width

2360mm (7′ 8″)

B: Greenhouse depth

1620mm (5′ 3″)

C: Ridge height

2170mm (7′ 1″)

D: Eaves height

1810mm (5′ 11″)

E & F: Door Size

610mm (2′) x 1610mm (5′ 3″) (aperture)

Growing Area:

5.0m²

Minimum Base Size

2360mm (7′ 8″) x 1620mm (5′ 3″)

Customise your Greenhouse

Select your Colour:

Silver
£2,625

Green
£2,500

Black
£2,599

Get it installed by Professionals:

Installation requires that you purchase the Base Plinth Option if one is available. You MUST have a surface of slabs, concrete or decking. NOT soil or gravel.

No Installation
£0

Installation
£470

Add Staging?

Janssens Colour Coded Full Length Integrated Staging

+ £110

Add the Colour Coded Full Length 236cm long integrated shelving to the rear of your greenhouse to help retain your floor space

Qty 1

Janssens Colour Coded Seed Tray Shelving

+ £249

Add the Colour Coded Full Width 236cm long Seed Tray Shelving to the rear of your greenhouse to help retain your floor space

Qty 1

£15 off

1 Tier Staging Black

+ £74

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

Qty 1

Janssens Integrated Colour Coded Shelving

+ £75

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

Qty 1

£20 off

2 Tier Staging Black

+ £99

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

Qty 1

Top Tier Staging Extension Black

+ £49

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

Qty 1

Janssens Colour Coded Integrated Staging

+ £125

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

Qty 1

Add Ventilation, Shading and Crestings?

Janssens Colour Coded Roof Cresting

+ £250

Complete the look of your Janssens greenhouse with ridge crestings

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

10 Year Warranty
Free UK Delivery
Expert Installation Available

£2,599

🚚

FREE* delivery within 8 Weeks

* Some areas may incur a delivery charge.

Limited Spring Stock

£2,599

Delivery 4-16 weeks ⛟

Need Help Choosing?

📞 0800 098 8877

CALL US FOR A GREAT DEAL

The Janssens Helios Urban 5x8 Greenhouse in Black gives you all of the functionality and convenience of a modern greenhouse, with the classic look of a traditional Victorian Greenhouse. Because the sliding door to the greenhouse is on the long side, it`s perfect for a corner of the garden or along a wall or fence line.

All Janssens greenhouses use some of the thickest and strongest Aluminium profiles on the market and combine with the Glazing Gasket to take on the worse of UK weather!

1620mm x 2360mm Dimensions (5ft 3' x 7ft 7')
Aluminium Frame with Tubular and Box Section for Superior Strength.
Black Powder Coated Frame.
Box Section Base Plinth.
Single Sliding Door.
4mm Full Length Toughened Safety Glass
Rubber Glazing Gasket Strips (no fiddly clips)
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.

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

Included with ALL Janssens Greenhouses.

The Janssens Foundation Base eliminates the need for a full concrete foundation. Simply assemble your greenhouse and secure it with our quick 4-corner anchoring system!

Premium 4mm Toughened Glass

JANSSENS delivers superior protection with our full-length 4mm toughened glass. Six times stronger than ordinary glass, it offers exceptional durability and safety. Enjoy crystal-clear views and peace of mind, knowing you're shielded by the industry's safest greenhouse glass. Polished edges ensure easy, safe assembly, letting you focus on what truly matters â€“ your thriving garden.

Weather-Tight Seal: Superior Protection Guaranteed

Don't let wind effect your investment with Janssens state-of-the-art glazing system. Featuring:

Advanced rubber strip technology
Unbeatable water and wind resistance
Seamless, long-lasting seal

Industry-Leading Strength in Every Frame

Janssens cutting-edge tubular aluminium glazing bars are among the sturdiest in today's greenhouse market. Enjoy peace of mind knowing your investment is protected by top-tier materials that outlast and outperform the competition!

Built to Last: Premium Stainless Steel Hardware

Every bolt, nut, and fitting in your JANSSENS greenhouse is crafted from top-quality stainless steel to withstand the elements,

Smart Water Management System Included

Maximize your growing potential with our comprehensive water control solution:

Efficient gutters to collect rainwater
Clever condensation channels to manage humidity
Large 40mm downpipes for rapid drainage

Effortless Assembly at Your Fingertips

Set up your new greenhouse with ease. Every model includes:

Detailed step-by-step manual
Comprehensive assembly video

Lasting Beauty: Premium Powder-Coated Finish

Janssens only use Qualicoat-certified powder coating on all of their Greenhouse products. This high-quality finish ensures your JANSSENS greenhouse stays stunning for years. Contact us for custom RAL colours.

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.

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Greenhouse Buyers Guide 2025

This comprehensive 2025 guide helps you choose the perfect greenhouse by exploring crucial factors from size and materials to optimal location and essential accessories.

Make an informed decision by understanding how to assess your needs, compare material pros and cons, and ensure proper ventilation and positioning for a thriving greenhouse.

How to Prepare the Ground for a Greenhouse Base

A solid base is the backbone of any greenhouse. You might think skipping this step saves time, but trust me—I've seen plenty of greenhouses fail because of poor foundations. A dodgy base causes more headaches than you'd believe.

What happens with a bad base? Glass cracks. Doors jam. The structure twists. Water pools where it shouldn't. And fixing these problems costs way more than doing it right first time.

Placing your greenhouse in the right spot makes all the difference between thriving plants and disappointing results. As a greenhouse specialist who's spent 15 years helping UK gardeners optimise their growing spaces, I've seen first-hand how position affects everything from temperature regulation to plant health.

Let me share what actually works in our unique British climate. The greenhouse position might seem like a minor detail, but it's one of those things that can make or break your growing success. I made this mistake myself when I first started - my poorly positioned greenhouse meant I was fighting an uphill battle with inadequate light and temperature fluctuations.

Janssens Helios Urban 5x8 Greenhouse in Black

SAVE £50 EXTRA