Forest Xtend 2.5 Insulated Garden Office 2.54m x 2.9m (97mm)

Product Code: SHS25570
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The Xtend 2.5 is an industry-leading garden office, using revolutionary SIP construction to create a fully-insulated garden room which will remain a pleasurable space to work from home throughout the seasons.

  • Constructed from revolutionary Structural Insulated Panels (SIPs) for thicker, better, year-round insulation
  • 97mm SIP walls with attractive 15mm tongue and groove external cladding plus further internal cladding for an incredible 177mm thickness
  • 108mm SIP floor and 122mm SIP roof for top-to-bottom, superior insulation (images shown with laminate flooring added)
  • Double-glazed door with 7-point multi-lock; 2 full-length, double-glazed windows
  • 15-year structural guarantee
  • Other sizes available here

Choose the standard 2.5 model with a 1/4 height opening window in the side pane or upgrade to the 2.5+ model with a 1/2 height opening window in the side pane.


Please ensure a solid, level base is constructed BEFORE your installation date. Installation does not include electrics or other accessories. Please see the installation section below for more details.

  • Accessories
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    £1,369.00 £1,669.00
    Hubi Solar Power Station Premium 750

    Hubi Solar Power Station Premium 750 - £1369

    The next-generation Hubi Solar Power Station Premium 750 generates free, eco-friendly electricity, making it a simple, cost-effective way to fully power any larger multi-room garden building such as a big log cabin, workshop shed or even a small cottage.

    Electrical independence for garden buildings is now a reality with this all-in-one solar power hub. It includes a super-size solar panel, solar power station and battery storage.

    The panel comes in a sturdy frame which can either be pegged to soft ground using the supplied stand, or mounted on a roof. It is incredibly efficient, taking as little as 5 hours to charge a flat solar battery to full capacity.

    With purpose-built casing and a clear, user-friendly dashboard, the solar power station, itself, is smart, unobtrusive and very easy to store or manoeuvre.

    Its dashboard features a 12v auto socket, 5v USB charging, solar lighting ports and a 3-pin mains socket, capable of powering any 230AC appliance up to 300w, for example a television, laptop or lighting.

    CE-approved, RoHS-compliant and backed by a 2-year guarantee, this premium solar station delivers 750Wh of energy over a 24-hour period - even more during the summer months.

    Thanks to built-in battery storage, the electricity generated during daylight hours can be stored for later use, enabling a garden building to be powered at any time of the day or night, completely independent of the National Grid.

    This solar power kit couldn't be easier to install and absolutely no electrical skills are required. The equipment arrives fully assembled and ready to go - simply plug, play and enjoy solar power.

    The power station is available in 3 different sizes, delivering 250Wh, 500Wh or 750Wh of energy per day. Choose the 750 model to fully power a multi-room building.

    Three dedicated solar lighting packs are available too which can be mixed and matched with any of the 3 solar power station models.

    Delivery is free to most UK addresses.

    • Generates free electricity, independent of the Grid
    • Typically delivers 750Wh of energy per day
    • Includes battery storage
    • Super-size solar panel can be pegged to soft ground or mounted on a roof
    • It charges a flat solar battery in as little as 5 hours
    • Solar power station includes purpose-built casing and a user-friendly dashboard
    • Dashboard features a 12v auto socket, 5v USB charging, light ports and 3-pin mains socket
    • 250Wh, 500Wh and 750Wh models available
    • Choose the 750 model to power a garden building, construction site office or large log cabin
    • 3 dedicated solar lighting packs are available too
    • CE-approved and RoHS-compliant
    • 2-year guarantee
    • Installation of power stations or solar lighting is not included as part of any garden building installation service
    • Delivery is free to most UK addresses
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Forest Xtend 2.5 Insulated Garden Office 2.54m x 2.9m (97mm) Technical Drawing
Brand Forest Xtend
Cladding Tongue and Groove
Construction Type SIPs panels with external Tongue & Groove cladding/internal MDF cladding
Door Type Single Door
Eaves Height 2400
Size 8' x 10'
Internal Depth 2150
Internal Width 2170
Opening Windows 1 window
Ridge Height 2500
Roof Covering EPDM Rubber Membrane
Roof Style Pent
Material Wooden
Guarantee 15 years
Depth at Base 2500
Depth including Overhang 2900
Width at Base 2530
Width including Overhang 2540
Door Height 1950
Door Width 750
Glazing Material Double Glazing
Locking System 7 Point Multi-Lock With Ultion Three Star Security Barrel
Number of Windows 2 windows
Floor Material Structural Insulated Panels (SIPs)
Floor Thickness 108
Roof Material Structural Insulated Panels (SIPs)
Roof Thickness 122


The Forest Xtend 2.5 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. Two additional full-length, double-glazed windows ensure the interior benefits from an abundance of natural light. Our standard 2.5 Xtend model comes with a 1/4 height opening window in the side panel. You can choose to upgrade to our 2.5+ Xtend model for a 1/2 height opening window in the side window pane. Simply make your choice via the drop-down menu. 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.

*Please note that the garden office does not come painted grey. Image is for illustrative purposes only.*

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 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
  • 2 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

Why choose an Xtend 2.5 & 2.5+ Garden Building?

Achieve your ideal work/life balance with the Xtend range of garden buildings from Forest Garden. These new buildings have everything you could wish for in a home office: contemporary looks, real energy efficiency, ease of construction and keen pricing. All brought to you by the UK’s largest manufacturer of timber garden products.


Pre-cut external timber cladding panels for quick and easy assembly. Panels are made with 15mm premium interlocking tongue and groove boards mounted to framing battens. Comes untreated so we recommend the application of any of the following: Sikkens Cetol HLS Plus, Restol Wood Oil, Timmersol ETS Double Protectant, Osmo Country Colour and Osmo Natural Oil Woodstain.


The core structure of an Xtend building is made from SIPs – a high performance material for 21st century building construction. The SIPs are 97mm insulated walls consisting of 75mm of polystyrene insulation sandwiched by two sheets of oriented strand board (OSB). Total wall thickness including SIPS, internal and external cladding, and cavities is an impressive 177mm.


Interior MDF panels for walls and ceiling, pre-cut for quick and easy assembly. Wall panels are mounted to 28mm thick battens creating a cavity perfect for routing electrical wiring. Comes with primer applied, ready for you to paint in a colour of your choice using standard interior emulsion paint. The floor is left unfinished for you to add your own choice of covering.


External roof covering is made from 1.2mm thick EPDM black rubber. It creates a maintenance free, waterproof membrane. With 50 years life expectancy, it will not crack, split, fade or rot. Anthracite grey fascias provide a stylish finish to the contemporary roof.


Windows material: uPVC 5 chamber. Door material: uPVC reinforced 5 chambers. 28mm, A-rated, double glazed, safety glass throughout. The window and door frames are anthracite grey with a grained finish externally and white with a smooth finish internally. All doors and opening windows are fitted with key operated locks.


Highly efficient insulated walls, roof and floor, plus double glazing for a year-round garden room that is warm in winter and cool in summer. Energy efficiency rating of 78 (category C) - based on lighting from 3 x 4-watt LED bulbs and heat from a high efficiency wall mounted heat pump. Potential to increase to 82 (category B) with the addition of a photovoltaic solar panel.




A perfect fit for traditional or modern gardens.



Although we do not install electrics as part of our installation service, the Xtend range has been designed for routing electrical wiring and recess roof lights!


250 (H) X 254 (W) X 290 (D)CM






Space is at a premium in most homes and extensions are costly. An Xtend garden building is constructed from high quality, energy efficient materials and is underwritten with a 15 year structural guarantee. You can be confident with Xtend that quality has not been compromised over price.



Xtend is a clever choice for your garden building as it comes delivered in pre-cut modular SIP panels ready for assembly. Some of the best designed new homes are now made this way, so why not your new garden building? A step-by-step guide means the build is incredibly straightforward.


Xtend garden buildings are not just brilliant spaces for working at home. More than just a home office, Xtend opens up affordable space for countless uses such as hobbies, exercising, entertainment and accommodation. With Xtend, size and versatility can be combined perfectly to suit your requirement for extra space. Make your space your own.



Keeping you warm in winter and cool in summer, Xtend delivers real energy efficiency. Double glazed windows, highly efficient insulated walls, roof and floor combine to drive down energy costs. It’s a fact that Xtend garden buildings have a higher EPC rating than the average home.



It only takes a glance to see that an Xtend garden office has the pleasing lines and contemporary design to catch the most discerning eye. Xtend is at home in any garden, be it traditional or modern - just how great design is meant to be.



Everything you need to know about Xtend by Forest Garden

Xtend By Forest - How to Build


Trustpilot Reviews

Xtend 2.5 & 2.5+ Features

From The Supplier: Forest Garden


"We're proud to be the largest and most trusted manufacturer and distributor of garden timber products in the UK" - Forest Garden

Making British Gardens Great


At Forest, we know a fair bit about fences. And sheds for that matter. In fact, we've been one of the UK's most trusted manufacturer and distributor of quality wooden garden products for over 50 years.


With two sawmills in the UK processing locally-sourced timber, and a Head Office in Hartlebury, Worcestershire, you’ll find our range of garden buildings, fencing, decking and decorative structures for sale across many sites online and in over 3,000 retail stores. From the forest to the doorstep, we are involved every step of the way to ensure we bring you the best product and service.


Well made in Britain


The majority of the timber we use is grown and felled from managed UK forests across Scotland and Wales. After felling, the timber is cut and processed in one of our nearby sawmills and taken to our manufacturing operation in the heart of Britain. It is here our skilled workforce proudly produce the widest range of garden buildings, fencing and structures available in the UK.


All of the products that we sell are dispatched from this site. The final part of their journey is managed by our dedicated delivery department who are responsible for distribution direct to customers' homes by our fleet of vehicles.


Home Grown


We're proud to say that the majority of the timber we use is cut in our very own sawmill from trees grown in the UK.


Not only that, but our range is certified by the Forest Stewardship Council and the majority of our products carry the FSC logo - so you know that our timber is ethically sourced from well-managed, sustainable forests that are replanted for future generations.


(Certification number TT-COC-001790, Issue date 5 March 2015)


Helping Everyone Thrive


We like to do our bit for charity and are proud to support Thrive. Thrive uses gardening as therapy to bring about positive changes in the lives of people living with disabilities or ill health, or those who are isolated, disadvantaged or vulnerable.





"We are excited and proud to be a carbon neutral business. We work with Carbon Neutral Britain, the UK’s leading offsetting initiative provider to offset our environmental impact."

- Forest Garden

We Are Now Carbon Neutral!


We believe that a successful business is also a responsible business. This includes being dedicated to playing our part in protecting the environment, supporting our community and making sustainable choices. It also means that we value our colleagues and their welfare, putting policies into practice to make sure we are an employer of choice in our field. For us, this is a passionate commitment that runs through everything we do.


All of us who work with Forest Garden can be proud of what we do and this is embodied in the 3 fundamental principles - Keeping It GreenSupporting Our Colleagues and Supporting Our Community.

Xtend Garden Buildings Installation


Forest Xtend Garden Buildings Installation

Forest Garden provide their own expert fitters to install your Xtend Garden Building. With dedicated experience installing Forest's Xtend Range, they will provide a professional service that is second to none. They aim to carry out installation within 1 - 5 working days of the delivery of the garden office and it is usually quicker than this estimate.


After your order, Forest Garden will send you a detailed document covering the requirements of a suitable base for a Xtend Garden Building.


Forest Garden do not provide a service for the preparation of the base area or for installation of electrics, wi-fi, solar lighting or plastic bases. If you require assistance with these, we recommend the use of for locating a reputable tradesperson in your area.


If you choose to install the garden office yourself, you can use the detailed guide which includes step by step images to help you. Forest Garden also have a Technical Helpline if you have any questions along the way.


If you are using an independent tradesperson to install your garden building, please allow enough time for the garden building to be delivered and the parts inspected before booking your tradesperson.


Please inform customer service BEFORE you order, if you believe there are restrictions which could impact the delivery and installation of the garden room.


Xtend DeliveryXtend Delivery
Delivery VanDelivery Van


We offer FREE Delivery to the majority of mainland postcodes but some areas may incur an additional carriage charge (see below). Please use our postcode checker further up the page (below the add to basket button) or within checkout to check delivery is available to your area.

£49.99 - BH, BN, CA, CT, DH, DL, DT, EX, IP, LA, LL, ME, NE, NR, PL, PO, SA, SO, SR, TA, TN, TQ, TS

£119.99 - DD, DG, EH, FK, G, IV, KA, KY, ML, PA, PH, TD. Please allow an additional 5-10 working days for delivery into these postcode areas.

£124.99 - AB


Your delivery will be made between 8am and 6pm on your pre arranged delivery date; our delivery team will contact you to book via phone.

Our service is a Kerb side pallet drop delivery by a crane off-load vehicle. Unfortunately we will not be able to unpack your Xtend Garden Building and take your goods to the back of the property. We typically plan to deliver to the front garden or drive.

Xtend Garden Buildings are delivered in two packages, flat packed, direct to your home and supplied with a comprehensive set of instructions to help you get started.

Please Note - delivery is NOT available to the following postcode locations: BT, GY, HS, IM, IV1-11,14-28,40-63, JE, KA26-28, KW, PA20,28-31,34, PH32-35,41, PO31-41, TR 

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