Description

How does this structure manage internal temperatures?

Equipped with 5 opening skylights managed by a Bayliss Auto Vent, this 8ft x 20ft wooden greenhouse delivers automated climate control that helps resist heat accumulation. As the British summer warms the glasshouse, the wax-filled cylinders naturally expand to push the roof vents open, requiring zero electricity. Paired with the colossal span of 14 fixed windows constructed from 3mm toughened glass, your plants receive comprehensive solar exposure alongside consistent, passive air circulation from end to end.

What protects this garden building from harsh weather?

Built upon a robust pressure treated perimeter base foundation, this sustainable timber glasshouse actively defends against ground moisture and premature wood rot. The lower exterior walls feature tightly interlocking 12mm tongue-and-groove panels, which form a formidable barrier that helps resist seasonal moisture ingress. Finishing the aesthetic is a striking roofline topped with an ornate finial and crestings, ensuring this substantial horticultural building remains both visually stunning and highly weather-resilient.

Is manoeuvring large equipment straightforward?

The inclusion of wide glazed double doors on this massive wooden greenhouse ensures unrestricted access for wheeling heavy barrows or installing multi-tier staging. Outfitted with a reliable traditional gate latch handle, the entry point offers a smooth, secure fastening method for daily operations. Furthermore, the doors themselves feature the same 3mm toughened glass, ensuring that even the primary entrance pathway benefits from maximum light transmission while defending against accidental bumps.

Features:

Guarantee - 10-year anti-rot

Walls - Toughened glass window panes with joinery panels

Base - Pressure-treated base frame timbers

Roof - Toughened glass with joinery window panes

Frame - 34mm x 58mm

Windows - 14 fixed + 5 opening skylights fitted with Bayliss Auto Vent

Doors - Double door

Handle - Gate latch

Lock - Magnet/turn button

Treatment - Dip-treated (application of preservative and waterproof coat required)

Optional Wooden Benches - Multiple configurations of benches/staging are possible. 6ft bench dimensions: 334x1722x750mm (WxLxH). 4ft bench dimension: 334x1122x750mm (WxLxH). Order these benches from the 'Choose Additional Options' section above.

Make the Most of Your Wooden Greenhouse

With the phenomenal length of this 8ft x 20ft structure, growers can easily segment the interior into distinct cultivation zones for varying crop types. Utilise the vast lower wall space provided by the 12mm tongue-and-groove panels to install extensive runs of heavy-duty staging, leaving the central aisle perfectly clear for navigating through the glazed double doors.

Take full advantage of the 14 fixed windows by positioning light-hungry Mediterranean vegetables along the sunniest flanks of the building. Because the climate is autonomously regulated by the 5 opening skylights and their accompanying Bayliss Auto Vent mechanisms, you can cultivate delicate orchids at one end and hardy seedlings at the other, confident that the system actively defends against sudden temperature shifts.

About Your Order

The Shire Greenhouse is a British-made garden building made from sustainably sourced timber. You will get a low-carbon footprint wooden greenhouse made from ethically sourced materials. The practical design makes it straightforward to assemble. It comes with a 10-year anti-rot guarantee and a 12-month manufacturer's warranty.

Superior fixings, and optional assembly from the manufacturer is available. The timber boards attach to a solid internal framing to make hard-wearing and sturdy panels. The Greenhouse is flat-packed for easy handling and assembly.

Please note: Images may depict furnishings and accessories; optional potting shelf, these are for illustration purposes only and are not included with your order.

Wooden Greenhouse Aftercare

The greenhouse has timbers that have a dip-treated base coat to protect them during transit. You must apply a preservative and waterproofing topcoat immediately after installation. Using the treatment after installation, followed by consistent annual treatment of the wooden greenhouse, will maintain the high-quality finish and is a requirement of the 10-year anti-rot guarantee. A 1-year manufacturer's warranty is included as standard.

To treat the greenhouse, elbec recommends Protek wood treatment. Browse our Protek Royal Exterior Wood Finish Paint range to find the best paint colour to add your personalised finish. In the options section, we’ve included popular colours and a Wood Preserver+ for use underneath your colour choice.

About Shire

Shire is one of the UK's leading manufacturers of garden buildings. It is the proud manufacturer of the most extensive UK timber garden building range, which includes Garden Sheds, Log Cabins, eco homes, Home Offices, Sheds, Workshops, Summerhouses, Playhouses, Arbours, Storage units, and Pet houses.

Their UK production facilities cover 23 acres, including stock holding facilities and an advanced high-speed timber planing mill. There is also a modern, well-equipped joinery production facility and semi-automated production lines. All Shire garden buildings are manufactured in the UK using the finest spruce timber, imported directly, and manufactured using the most up-to-date machines to ensure the best quality and best value for money garden sheds in the UK.

Frequently Asked Questions (FAQs)

What base does the Holkham Greenhouse need?

The Holkham Greenhouse should be installed on a firm, flat and level base. Preparing a suitable greenhouse base helps provide stability and ensures the frame and doors are correctly aligned.

What can I grow in a Holkham Greenhouse?

The Holkham Greenhouse is suitable for growing a wide range of plants and produce, including tomatoes, cucumbers, peppers, herbs, salad crops, seedlings and flowers.

Does the Holkham Greenhouse have an automatic roof vent?

Yes, the Holkham Greenhouse features an auto-opening roof vent to help regulate the temperature and improve airflow inside the greenhouse. The vent automatically opens as temperatures rise and closes as they fall, helping to maintain a comfortable growing environment without the need for manual adjustment.

What are the benefits of owning a garden greenhouse?

A garden greenhouse can extend your growing season, provide protection for more delicate plants and create a controlled space for growing fruit, vegetables, flowers and seedlings throughout more of the year.

View other products in Wooden Green Houses »

Delivery

ALL DELIVERIES ARE DELIVERED TO KERBSIDE AND ARE FLAT PACKED READY FOR ASSEMBLY

FREE delivery is offered to the majority of mainland UK postcodes but some areas may incur a surcharge and some postcode areas are not covered at all. Please check your postcode in the ‘Delivery cost checker’ above to confirm availability and any possible surcharges.

Delivery Lead-times:

The product page above displays the estimated delivery lead time, which is specified in working days (Monday - Friday) and excludes Bank Holidays. Although the manufacturer provides these estimated lead times in good faith, they are not guaranteed due to fluctuations in demand. However, the lead times are representative of delivery at the time of estimation. It's worth noting that delivery may take a little longer in some remote areas.

Installation option of Greenhouse:

If you are choosing the installation option after placing your order you’ll be contacted within 5 working days by Shire the manufacturer either by a text message or automated telephone message (the latter if a mobile number is not supplied). This message will supply you with the name of the website to go on to where you will be required to accept the terms and conditions for assembly. Any delay in accepting these terms and conditions may affect your timescale. Once you have accepted these terms and conditions you will be contacted during the timescale with a date for the delivery/assembly of your order. The installation option will extend your lead time by up to 15-25 working days. This may take longer during seasonal periods. Please be aware that the installation team will require full access to your garden, 18" clearance all around the building and a firm and level base. Shire's installation team will not bring a building through your home as they are not covered by insurance to enter a customer’s home.

Painting Option:

The delivery leadtime for our painting service the product page above displays the estimated delivery lead time, which is specified in working days (Monday - Friday) and excludes Bank Holidays.

Booking Date:

This product will be delivered to you by Knowles Carrier, acting on behalf of Shire, the manufacturer. Shire's dedicated delivery team will reach out to you directly to provide information about your delivery date.

Upon Delivery
Knowles, a courier representing the manufacturer Shire, is responsible for delivering the item. The delivery is typically carried out using an 18-ton vehicle within the timeframe of 8am to 8pm. Please note that the delivery drivers are insured to deliver only to the kerb side or driveway, and will not take any risks that may result in property damage while delivering the product. Additionally, we regret to inform you that delivery personnel will not be able to enter your property. Finally, the driver will hand-ball the item off during delivery.

It is not advisable to engage a third party for product installation before its delivery and verification of all parts. Please note that we cannot be held responsible for any costs incurred by a third party.

Specification

Quickview

The immense 8ft x 20ft Shire Holkham wooden greenhouse provides a premium, expansive environment ideal for serious horticulturists seeking maximum cultivation space. Crafted in the UK from high-quality sustainable timber, this colossal garden glasshouse combines a beautiful traditional appearance with heavy-duty structural stability. Key features include:

• 12mm tongue-and-groove panels: Delivers a highly resilient lower framework that helps resist driving rain.
• 14 fixed windows and 5 opening skylights: Floods the massive interior with sunlight whilst offering targeted airflow.
• 3mm toughened glass: Equips the entire building with shatter-resistant glazing that defends against sudden impacts.
• Pressure-treated perimeter base foundation: Elevates the timber above damp ground to help resist fungal decay.
• Glazed double doors: Grants extra-wide entry for manoeuvring industrial-sized compost bags or large potting benches.