Forest Xtend 3.0M Premium Garden Building

Forest Xtend 3.0M Premium Garden Building

Create a spacious, comfortable and energy-efficient garden room with the Forest Xtend 3.0M Premium Garden Building. Designed to offer all the benefits of a modern home extension without the associated cost and disruption, this premium garden building is ideal as a home office, studio, gym, hobby room or additional living space. Its contemporary appearance, outstanding insulation and high-quality construction make it a practical solution for year-round use. Built using advanced construction methods and premium materials, the Xtend Premium range delivers exceptional thermal efficiency, excellent durability and straightforward installation. Backed by a 15-Year Structural Guarantee, this garden building has been designed to provide reliable performance and lasting value for many years.

Advanced Structural Insulated Panel Construction

The Forest Xtend 3.0M Premium Garden Building is constructed using Structural Insulated Panels (SIPs), an advanced building system widely used in modern energy-efficient homes. These precision-engineered panels combine exceptional structural strength with outstanding insulation, creating a highly efficient building that remains comfortable in every season. The walls feature 75mm polystyrene insulation sandwiched between two sheets of oriented strand board (OSB), creating a total finished wall thickness of 177mm once the internal and external cladding are installed. The insulated roof measures 122mm thick, while the insulated SIP floor further improves thermal performance and comfort. Thanks to its high-performance insulation and premium glazing, the Xtend Garden Building stays warm during the winter and cool throughout the summer. With the addition of a suitable photovoltaic solar panel, it has the potential to achieve an Energy Performance Rating (EPC) of Category B, helping to reduce ongoing energy costs.

Premium Interior & Exterior Finish

Externally, the building is finished with premium 15mm tongue and groove timber cladding, supplied as pre-cut panels that make installation faster and more straightforward. The kiln-dried timber is supplied untreated, allowing you to apply your preferred exterior stain, paint or preservative to complement your garden. Internally, the walls and ceiling are finished with primed MDF panels featuring an attractive vertical beaded profile. The internal wall battens create a convenient service cavity for electrical wiring, while deeper roof battens allow space for recessed lighting. The insulated floor is left unfinished, giving you complete freedom to install the flooring of your choice, including laminate, engineered wood, carpet or vinyl.

Premium Security, Glazing & Weather Protection

Designed to maximise both natural light and security, the Forest Xtend 3.0M Premium Garden Building features double anthracite grey reinforced uPVC doors and two opening windows, providing excellent ventilation alongside a bright and welcoming interior. The windows and doors are fitted with 28mm A-rated double-glazed safety glass, helping to improve insulation while reducing outside noise. The double entrance doors feature a secure 7-point multi-locking system with an Ultion three-star security cylinder, giving you added confidence when storing valuable equipment or working from home. The contemporary pent roof is protected by a single-piece EPDM rubber membrane, offering a maintenance-free waterproof roof covering with an expected lifespan of up to 50 years. Unlike traditional roofing felt, EPDM is UV resistant and will not crack, split, rot or encourage moss growth.

Simple Modular Installation

The Forest Xtend Premium Garden Building is supplied as a complete modular kit including pre-cut SIP panels, internal and external cladding, fixings and detailed assembly instructions. The precision-manufactured components significantly reduce installation time compared to traditional timber buildings, making the building process faster and more efficient.

• Ideal for use as a home office, studio, gym or garden room.
• Advanced Structural Insulated Panel (SIPs) construction.
• Excellent thermal performance for year-round comfort.
• Premium 15mm tongue and groove external timber cladding.
• Primed MDF internal wall and ceiling panels.
• 177mm insulated wall construction.
• 122mm insulated SIP roof.
• 108mm insulated SIP floor.
• Double reinforced uPVC entrance doors.
• Two opening windows for improved ventilation.
• 28mm A-rated double-glazed safety glass.
• 7-point multi-locking door system with Ultion three-star security cylinder.
• Maintenance-free EPDM rubber roof with up to 50-year life expectancy.
• Supplied with all fixings and comprehensive assembly instructions.
• Manufactured in the United Kingdom.

Product Specifications

• Product: Forest Xtend 3.0M Premium Garden Building
• Overall Dimensions (H x W x D): 250 x 298 x 290cm
• Construction Type: SIPs Panels with External Tongue & Groove Cladding and Internal MDF Cladding
• Roof Style: Pent
• Treatment: None (Kiln Dried Timber)
• Colour: Natural Timber
• Wall Thickness: 177mm
• External Cladding: 15mm Tongue & Groove
• Internal Cladding: 9mm Primed MDF
• Roof Thickness: 122mm
• Roof Covering: One-piece EPDM Rubber Membrane
• Floor Thickness: 108mm
• Door Type: Double Reinforced uPVC Doors
• Door Lock: 7-point Multi-Locking System
• Windows: 2 Opening Windows
• Glazing: 28mm A-Rated Double-Glazed Safety Glass
• Base Footprint: 297 x 250cm
• Weight: Approximately 1,800kg
• Country of Origin: United Kingdom

Frequently Asked Questions

Can the Forest Xtend 3.0M Premium Garden Building be used all year round?

Yes. The advanced SIPs construction, highly insulated walls, roof and floor, combined with A-rated double glazing, provide excellent thermal performance, making the building suitable for comfortable year-round use as a home office, studio or garden room.

What are the benefits of the double doors and opening windows?

The double reinforced uPVC doors create a wider entrance for moving furniture and equipment, while the two opening windows allow excellent natural ventilation and help keep the interior bright, fresh and comfortable throughout the year.

Does the building require external treatment after installation?

The external timber cladding is supplied kiln dried and untreated, allowing you to apply your preferred exterior wood stain, paint or preservative. The internal MDF wall panels are factory primed and ready to be painted using standard interior emulsion in the colour of your choice.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.