15′ x 10′ Forest Timberdale 25yr Guarantee Tongue & Groove Pressure Treated Windowless Double Door Apex Shed (4.53m x 3.21m)

Overview

The Forest Timberdale is a premium, large apex shed built by the UK’s leading manufacturer of wooden garden buildings. This 15×10 windowless double door apex shed (4.53m x 3.21m) combines exceptional build quality with a market-leading 25-year anti-rot guarantee. Expertly designed and handmade in Worcestershire, it’s the ideal choice for secure, spacious garden storage or a dedicated workshop space.

Key Features

• Premium 12mm tongue and groove construction throughout
• Robust 28mm x 56mm internal framing – 30% more timber than standard sheds
• Completely modular design for easier assembly and door placement flexibility
• Windowless design for enhanced security and tool protection
• Ledged and braced (Z-frame) double doors with rim lock, exterior turn buttons and interior bolts
• FSC-certified, sustainably sourced timber
• Pressure-treated for complete maintenance freedom
• 25-year anti-rot guarantee – no further treatment needed
• Higher apex roofline for increased headroom and storage capacity
• White Glove Delivery Service included

Roof Type

This shed features a high-pitched apex roof design that maximises internal headroom and storage space. The roof is constructed from premium 12mm tongue and groove timber and is covered with high-grade, polypropylene-backed felt for superior weatherproof protection. Two decorative diamond-shaped finials add visual appeal to the apex design.

Dimensions

• Length: 15 feet (4.53 metres)
• Width: 10 feet (3.21 metres)
• High apex roofline for excellent headroom

Construction

This large wooden shed is built using modular construction with premium 12mm tongue and groove boards throughout. The robust 28mm x 56mm internal framing uses significantly more timber than standard sheds, delivering exceptional strength and durability.

The floor is also constructed from 12mm tongue and groove timber, fitted with pressure-treated bearers that provide extra support and protect against ground moisture. The modular design means the shed is delivered in smaller, interchangeable panels, which makes assembly straightforward and allows you to position the doors exactly where you need them.

For the ultimate in garden sheds, the Timberdale range stands apart from other wooden sheds available on the market.

Treatment & Guarantee

The timber is FSC-certified, sourced from sustainable, well-managed forests. Every shed is pressure-treated to provide complete protection against rot and decay. Forest backs this with a market-leading 25-year anti-rot guarantee, meaning no additional treatment is ever required. This saves time and maintenance costs over the life of the shed.

Doors & Windows

The double doors are ledged and braced (Z-frame construction) for maximum strength. They’re fitted with a high-quality rim lock door latch, exterior turn buttons and interior bolts to keep your tools and valuables secure. The windowless design provides an additional security benefit and prevents visibility of stored items from outside.

The modular construction allows you to decide exactly where the doors should be positioned, tailoring the shed to your specific requirements.

Assembly Information

The completely modular design makes assembly more straightforward than traditional sheds. The shed arrives in smaller sections of interchangeable panels, which reduces complexity during the building process. Clear assembly instructions are included with every shed.

If you’d prefer professional help, Forest also offers an optional installation service for an additional charge.

Delivery Information

Forest’s White Glove Delivery Service is included with this shed. The building will be delivered free to most UK addresses, straight into your garden with all packaging removed. This premium service is designed to make receiving your new shed hassle-free.

Before delivery, you’ll need to prepare a suitable base – see Optional Upgrades below for base kit options.

Optional Upgrades

Wooden Shed Base Kit – A faster, more cost-effective alternative to laying slabs or concrete. Made from UC4 incised, pressure-treated timber, this base is guaranteed to resist rot for 15 years. Dimensions: 7.5cm (h) x 300.6cm (w) x 442.5cm (d).

Plastic Shed Base Kit – For the 15×10 shed, this interlocking plastic base is quick and simple to install. Made from 100% recycled plastic, it provides ventilation and drainage beneath the shed to keep the floor dry. The base can be repositioned and reused. Contains 54 squares (500 x 500 x 40mm each) plus heavy-duty weed membrane. We recommend 15kg of 10mm pea gravel per square.

Professional Installation Service – Available as a chargeable optional extra if you’d prefer not to assemble the shed yourself.

Looking for other garden storage solutions? The Timberdale range also includes other sizes and designs, or explore our range of summer houses and log cabins for additional garden space.

Frequently Asked Questions

How much more timber does this shed use compared to standard sheds? The Timberdale uses 30% more timber than standard sheds, thanks to its robust 28mm x 56mm internal framing, making it significantly stronger and more durable.

Is pressure treatment included, or will I need to treat the shed myself? The shed comes fully pressure-treated. No further treatment is required, and it’s backed by a 25-year anti-rot guarantee.

Can I choose where the double doors are positioned? Yes – the modular design allows you complete flexibility in door placement, so you can tailor the shed to your specific needs.

What base do I need? You’ll need to prepare a solid, level base using concrete, slabs, or one of our optional base kits (wooden or plastic). The shed cannot be placed directly on grass.

Is assembly included? Assembly instructions are provided. Professional installation is available as an optional, chargeable service.