20′ x 10′ Forest Beckwood 25yr Guarantee Shiplap Pressure Treated Windowless Double Door Apex Wooden Shed (5.96m x 3.21m)
Overview
This substantial 20×10 apex shed from Forest Beckwood is built to last, with an industry leading 25 year anti rot guarantee on pressure treated timber. Handcrafted in Great Britain from FSC certified sustainable wood, this wooden shed combines traditional craftsmanship with modern engineering, and the windowless design with secure double doors makes it ideal for storing valuable tools, bicycles, fishing tackle and garden equipment.
Key Features
- 25 year anti rot guarantee, the longest on the market
- Pressure treated timber requires no maintenance retreating
- Complete modular design for straightforward assembly
- Flexible door placement to suit your garden layout
- 30% thicker framing for superior strength
- Windowless design provides enhanced security
- FSC certified sustainable British timber
- Over 50 years manufacturing experience from Forest
Roof Types
The apex roof features a traditional pitched design with barge boards and decorative finials. Built from 8mm OSB and reinforced with metal truss brackets, the roof is covered with durable green mineral felt for complete weatherproof protection, allowing excellent rainwater runoff and impressive headroom inside the shed.
Dimensions
- Size: 20′ x 10′ (5.96m x 3.21m)
- High roofline for taller items
- Comfortable room to move around inside
Construction
The walls are built from 12mm shiplap tongue and groove cladding mounted on a robust 28 x 56mm frame. The scalloped profile of shiplap boards provides excellent water runoff and creates a weathertight seal. The premium 12mm tongue and groove floor is engineered to handle heavy items and regular footfall, supported by pressure treated bearers that protect against ground moisture and rot.
Treatment & Guarantee
Every component is pressure treated to resist rot, with an extraordinary 25 year anti rot guarantee, the longest available on the market. This means the timber is protected for the long term, eliminating the need for costly maintenance treatments, so you will never need to retreat or reseal the wood.
Doors & Windows
The shed features wide double doors, ledged and braced for extra strength and to prevent warping or movement. Hidden security hinges and a pad bolt, padlock not included, provide peace of mind for your valuables. The complete windowless design deters unwanted attention and adds another layer of security whilst maximising internal storage space, and the modular design allows you to position the double doors in different locations.
Assembly Information
Thanks to the modular design with interchangeable panels, this garden shed is significantly easier to assemble than traditional wooden sheds. The complete set of fixings and clear instructions are provided. If you’d prefer not to assemble it yourself, a professional installation service is available as an optional upgrade.
Delivery Information
Forest’s White Glove Delivery Service is available to most UK postcodes. Your shed is delivered straight into your garden with all packaging removed, taking the hassle out of collection and storage.
Optional Upgrades
You can enhance your shed with a Professional Installation Service, a Wooden Shed Base Kit made from UC4 incised, pressure treated timber (7.5cm h x 300.6cm w x 590cm d) with a 15 year rot guarantee, or a Plastic Shed Base Kit with 91 interlocking recycled plastic squares and heavy duty weed membrane.
Frequently Asked Questions
Do I need to treat the wood? No, the pressure treatment and 25 year guarantee mean you never need to retreat or maintain the timber.
Can I position the doors elsewhere? Yes, the modular design allows flexible door placement so you can customise the shed to suit your garden layout.
Is assembly difficult? The modular design makes assembly straightforward compared to traditional wooden sheds, or you can choose the professional installation service.

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