Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm)

Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm)

Brand Forest Xtend

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£11,999.99

Free delivery

3 offers at 3 retailers

Listed since 18 May 2026

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Description

The Forest Xtend 4.0 Insulated Garden Office is a modern garden room designed to work with your busy lifestyle. As well as the ideal home office, this versatile garden building also makes an excellent year-round family space or hobby room. Revolutionary Construction As an economic alternative to a home extension, this premium garden room is constructed from pre-cut, modular structural insulated panels (SIPs). Many new homes are now being built this way as SIPs offer ultimate insulation, are energy efficient and are robust. Unlike many other brands who offer just insulated walls, the Xtend range features SIP construction for the roof and floor too. The result is a fully insulated garden room from top-to-bottom. The incredible level of insulation also ensures that the home office will not be subject to damp, will be cool in summer, and will remain warm in winter - making it a pleasurable environment for working from home throughout the seasons. Each wall SIP consists of 97mm insulation sandwiched between two sheets of OSB (oriented strand board). The SIPs are completed and further insulated by both external and internal cladding. The internal cladding is MDF with a vertical beaded profile for a sophisticated appearance. It is primed ready for painting. The external cladding is high-quality, kiln-dried 15mm tongue and groove timber. As well as offering a stylish finish, tongue and groove is known for its weathertight structure. This combination of SIP, cladding and the cavities between gives the walls an incredible overall thickness of 177mm. Floor and Roof For increased insulation, the 108mm floor and 122mm pent-style roof are both built from SIPs too. The floor is left uncovered, so can be finished with carpet, laminate or other flooring according to personal taste. The interior of the roof is finished with pre-primed interior cladding ready for painting. Outside, the roof features a market-leading, black EPDM weatherproof roof covering, with an exceptional 50-year life expectancy. This rubber roof covering will not split or crack, does not support moss or algae growth, is UV-stabilised and is completely maintenance free. Anthracite grey facias complete the modern finish. Forest do not offer an electrical service. However, the 28mm wall battens and 45mm roof battens are designed to leave enough space to add electrical wiring and recess lights respectively. Electrical work should always be undertaken by a qualified electrician. Door and Windows Entry to this garden office is gained via a double-glazed, UPVC door, which is secured by a 7-point multi-lock to keep expensive equipment safe. Three additional full-length, double-glazed windows ensure the interior benefits from an abundance of natural light. The top quarter of the side window opens for ventilation. The door and windows all have grain-effect grey outer and smooth white inner frames, making for an exceptionally attractive appearance. Options Available and Assembly This top-of-the-range insulated garden room is available in 3 sizes and with 3 different door/ window configurations. Fixtures, fittings, exterior facias and a step-by-step installation guide are all included for a simple assembly. Forest do offer a professional installation service carried out be expert fitters. Energy Efficiency and Care Instructions This garden home office has an energy efficiency rating of 78 (category C) and has the potential to reach 82 (category B), with the addition of a photovoltaic solar panel. The outdoor office is delivered untreated. As such, the exterior should be treated upon assembly and again each year. Forest Garden recommend that it is cared for with one of the following: Sikkens Cetol HLS Plus, Restol Wood Oil, Timmersol ETS Double Protectant, Osmo Country Colour or Osmo Natural Oil Wood Stain. The internal cladding comes with primer applied, so can be painted in any colour using standard interior emulsion paint. Delivery Delivery is free to most UK addresses and free pick-a-day delivery is available to many areas. Some remote postcodes may incur surcharges. Please see the delivery information for further details. 15-year structural guarantee UK-made from revolutionary Structural Insulated Panels (SIPs) 15mm tongue and groove external cladding and MDF interior walls 108mm SIP floor and 122mm SIP roof for top-to-bottom insulation EPDM weatherproof roof covering, with a 50-year life expectancy Double-glazed, UPVC door with 7-point multi-lock 3 full-length, double-glazed windows Available in 3 sizes and with 3 different door/ window configurations Energy efficiency rating 78 (C) - potential 82 (B) Free delivery to most UK addresses

Full specifications

Marque Forest Xtend
EAN 5013053183625

Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) in 2026: still the right choice?

With the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm), Forest Xtend offers a solution suited to everyday needs in 2026. Available from 3 retailers on Compiral, this product benefits from real-time price comparison. Each offer is verified and updated several times a day to ensure you have the freshest information. Our platform calculates the total price including delivery costs, so you can identify the true best offer among all listed retailers.

Buy the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) now or wait?

With the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm), Forest Xtend delivers a quality level consistent with its market positioning. This product suits both newcomers and regular users of the Bureautique & Papeterie category. Its quick setup and reliable performance make it a recommended choice for anyone looking to invest in durable equipment without facing technical complications in the first weeks of use.

Value for money analysed in 2026

At £11,999.99, the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) offers value for money consistent with its positioning in the Bureautique & Papeterie category. Forest Xtend maintains a consistent quality level across this range, justifying the investment at this price. Compare with other available offers on our comparison tool to ensure you get the best rate at the time of purchase. The Forest Xtend 3.0 Insulated Garden Office 2.98m x 2.9m (97mm) from the same range may also interest you for comparison.

Serious alternatives to consider

If the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) does not exactly match your expectations, the Bureautique & Papeterie category offers other options to explore. Our comparison tool lists all available products with their prices in real time. Filter by budget, brand or availability to find the most suitable alternative for your situation. The Forest Xtend 4.0+ Fully Insulated SIP Garden Room Office with UPVC Double Doors 4.05m x 3.42m (97mm) is another reference from the same brand to consider.

Market price ranges in 2026

RangeIndicative price
Entry-levelUnder 3790 £
Mid-range3790 £ to 8840 £
High-endOver 8840 £

The Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) is available from several trusted retailers. Always check stock availability and delivery times before finalising your order to avoid any unpleasant surprises. On Compiral, offers showing "In stock" can be delivered quickly, often within 2 to 5 working days depending on the retailer and your delivery address.

Frequently asked questions about Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm)

Is delivery free for the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) at all retailers?

Free delivery is not guaranteed for the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) at every retailer. Some include it in their price, others charge separately. On Compiral, use the free delivery filter to display only offers with free postage. The total price shown in our table always includes delivery costs for a true cost comparison.

How do I return the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) if I am not satisfied?

You have a 14-day right of withdrawal for any online purchase, applicable to the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) regardless of the retailer. Precise return conditions vary by retailer: check their returns policy before buying. Statutory consumer rights protect you in the event of a defect discovered after delivery.

Is the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) worth its price in 2026?

In 2026, the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) is listed from £11,999.99 at our partner retailers. This price is consistent with the positioning of Forest Xtend in the Bureautique & Papeterie category. To judge whether this price is currently attractive, check the price history on our product page. Also compare the total price including delivery to avoid any surprises at checkout.

What warranty does the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) come with?

The Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) generally comes with a manufacturer warranty of 1 to 2 years depending on the retailer. In addition to the commercial warranty from Forest Xtend, statutory consumer rights apply to all purchases. Check the warranty conditions directly on the retailer's page before finalising your order.

Is the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) in stock?

Stock availability for the Forest Xtend 4.0 Insulated Garden Office 4.05m x 3.42m (97mm) is updated in real time on Compiral. Retailers showing "In stock" can usually deliver quickly, often within 2 to 5 working days. If the product is temporarily out of stock at one retailer, check the other offers in our table. Check back regularly as stock levels change frequently in the Bureautique & Papeterie category.

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