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12x12 Janssens Helios Retro Greenhouse
Greenhouse Dimensions
A: Greenhouse width
3840mm (12′ 7″)
B: Greenhouse depth
3840mm (12′ 7″)
C: Ridge height
2780mm (9′ 1″)
D: Eaves height
2010mm (6′ 7″)
E & F: Door Size
1400mm (4′ 7″) x 2000mm (6′ 6″) (aperture)
Minimum Base Size
3840mm (12′ 7″) x 3840mm (12′ 7″)
Quick Code: P172887
Experience the timeless elegance and superior strength of the 12x12 Janssens Helios Retro Greenhouse, complete with Victorian-inspired design, toughened safety glass, and a 13-year warranty. Customize your greenhouse to fit your style and needs with various door and window options available. Create your own garden oasis with this modern yet classic greenhouse.
Janssens Decor1 Panel - £
This panel has a cross hatch design.
Janssens Decor2 Panel - £
This panel features a more elaborate scrolled design
Door Options information
Hinged Double Door - £1100.00
Add a set of hinged double doors to your greenhouse
Single Hinged Door - £495.00
Add a Single Hinged Door to your greenhouse
Double Sliding Door - £475.00
Add a set of Double Sliding Doors to your Greenhouse
Single Sliding Door - £190.00
Add a Single Sliding Door to your greenhouse
Staging information
Janssens Colour Matched Integrated Shelving - £125.00
Add the Colour Matched 310cm long integrated shelving to the side of your greenhouse to help retain your floor space
Janssens Colour Matched Seed Tray Shelving - £295.00
Add the Colour Matched 310cm long Seed Tray Shelving to the rear of your greenhouse to help retain your floor space
1 Tier Staging Colour Matched - £74.00
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
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
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
This little top level Colour Matched shelf attaches to 1 or 2 Tier staging to give you a bit more storage space
Janssens Silver Integrated Staging - £80.00
Add the Silver 150cm long x 53cm wide integrated staging to your greenhouse to help retain your floor space
Ventilation and Shading information
Auto Roof Vent Opener - £39.00
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 will protect your plants from sun scorch and provide shade to moderate temperature. 6ft x 8ft.
Louvre Vent - £79.00
A louvre window brings fresh cool air into your greenhouse to moderate the temperature inside. An essential add on.
Auto Louvre Opener - £40.00
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).
Janssens Sunscreen Shading - £129.00
Add the Janssens retractable shading kit for ease of use
Janssens Roof Vent - £95.00
Add roof ventilation to your greenhouse to help moderate the temperature
Janssens Side Vent - £320.00
Help recirculate the air in your greenhouse with a side vent or two!
Extras information
Hygrometer - £17.00
This Hygrometer will measure the humidity levels inside your greenhouse.
Soil Thermometer - £29.00
This Soil Thermometer will let you track the temperature of your soil inside the greenhouse.
Max/Min Thermometer - £23.00
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
Add this 100L water butt kit that includes: Butt, Tap & Lid - Black Stand
The 12x12 Janssens Helios Retro Greenhouse is a grand building that features high outward opening doors with decorative panels to give a thoroughly traditional feel to your garden. The roof crestings and finials gives the greenhouse its Victorian looks, but with no maintenance to worry about as this is a modern aluminium greenhouse.
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 Retro 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!
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!
- 3840mm x 3840mm Dimensions (12ft 5inÂx 12ft 5in)
- 2m High Eaves
- Aluminium Frame with Tubular and Box Section for Superior Strength.
- Green or Black Powder Coated Frame.
- Box Section Base Plinth.
- Double Hinged Locking Doors - Outward Opening
- Victorian Greenhouse Roof Crestings.
- 4mm Full Length Toughened Safety Glass
- 4x Roof Vents
- Aluminium Decorative Bottom Panels
- 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 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
Greenhouse Dimensions
A: Greenhouse width
3840mm (12′ 7″)
B: Greenhouse depth
3840mm (12′ 7″)
C: Ridge height
2780mm (9′ 1″)
D: Eaves height
2010mm (6′ 7″)
E & F: Door Size
1400mm (4′ 7″) x 2000mm (6′ 6″) (aperture)
Minimum Base Size
3840mm (12′ 7″) x 3840mm (12′ 7″)
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 – 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.
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.
