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

Product Code: BAM25570
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The solution to creating space for working from home, the innovative Xtend 2.5 garden office is built using the latest construction techniques for a modern year-round office whatever the season.

  • Built from industry-leading Structural Insulated Panels (SIPs) for superior, year-round insulation
  • Insulated from top to bottom with 97mm SIP walls, 108mm SIP floor and 122mm SIP roof
  • 15mm tongue and groove exterior cladding
  • Pre-primed interior cladding ready for painting
  • A-rated double-glazed door and 2 full-length 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

    Make your holiday cottage or multi-room garden building energy self-sufficient with the Hubi Solar Power Station Premium 750 - the perfect way to reduce your electricity bills and cut your carbon footprint too.

    This solar power kit includes a solar panel with frame and stand, a solar power station with dashboard, and built-in battery storage. Plug and play technology means you can have it operating in minutes - no mains connection is required.

    Position the solar panel on the ground or a roof then watch it charge a flat solar battery to full capacity in as little as 5 hours.

    The solar power station is modern, stylish, easy to handle and has a user-friendly dashboard. This features a 12v auto socket, 5v USB charging, solar lighting ports, and a 3-pin mains socket for powering any 230AC appliance up to 300w, for example a TV, laptop or lighting.

    It can deliver 750Wh of energy every 24 hours, even more in the summer months. Built-in battery storage allows the energy to be stored for later use, so there's nothing to stop you enjoying a fully-powered cottage, day or night.

    CE-approved and RoHS-compliant, this fantastic solar station comes with a 2-year guarantee. It arrives fully assembled and ready to go, so no electrical skills are required.

    We sell this mobile energy system in 3 sizes, delivering 250Wh, 500Wh or 750Wh of energy per day. The Hubi Solar Power Station Premium 750 is perfect for powering a multi-room building.

    You have a choice of buying a dedicated lighting pack too. All 3 of them are compatible with any of the premium solar power stations.

    Free delivery is available to most UK addresses.

    • Delivers 750Wh of energy every 24 hours
    • Solar panel comes with frame and mounting stand
    • Fully charges a flat solar battery in 5 hours
    • Solar power station includes casing and a user-friendly dashboard
    • Dashboard features 12v auto socket, 5v USB charging, light ports and 3-pin mains socket
    • Built-in battery storage
    • 2-year guarantee
    • 250Wh, 500Wh and 750Wh solar power stations available
    • Buy the 750 solar station to power a multi-room building
    • 3 dedicated lighting packs available too
    • Solar power stations and solar lighting are not part of our garden building installation service
    • Free delivery 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


Add year-round living space that will transform your work / life balance with the Xtend 2.5 Insulated Garden Office. With an innovative construction providing better energy efficiency than the average home, these specialist garden rooms from Forest are designed to make perfect home offices whatever the season. A versatile garden building, the Xtend also makes a luxurious hobby room or family space. The Xtend range of outdoor offices is available in 3 sizes with choices including double doors and a variety of window configurations.

Innovative Industry-Leading Build

Designed and built by Forest Garden - the UK's biggest manufacturer of timber garden products - this top-of-the-range garden office is made from innovative Structural Insulated Panels (SIPs). Previously only used in new homes, SIPs have an advanced construction which creates a garden office that is fully insulated, energy efficient and suitable for comfortable year round use. Cool in the summer and warm in the winter, the Xtend is a true alternative to a home extension. Plus, Forest have used SIPs for the roof and floor as well as the walls for a top-to-bottom insulation that you'll find hard to match with other brands.

The Walls

Each wall SIP is 97mm thick and consists of a 75mm layer of installation which is then sandwiched between two sheets of OSB (oriented strand board).

On the inside of the wall SIPs is a layer of MDF interior cladding which has an attractive vertical beaded profile for a timeless finish. It comes ready primed for you to paint with standard emulsion paint.

To the exterior of the wall SIPS, 15mm tongue and groove cladding provides further insulation and a handsome, weathertight finish. This makes the walls an extraordinary 177mm thick. The 28mm wall battens leave sufficient room for electrical wiring.


The robust 108mm SIP floor adds to the insulation and is protected by wrapped floor bearers which keep the floor raised from ground damp. The floor surface is left uncovered, allowing you to finish it to your own taste with carpet, laminate or other flooring material.


The 122mm pent SIP roof provides even further insulation and has a black EPDM weatherproof covering. This modern alternative to roof felt has an incredible 50-year life expectancy. It is made from thick, UV-stabilised rubber, which won't fade, crack or suffer with moss growth. What's more, it is completely maintenance free, saving you time and money. The roof is completed by anthracite grey fascias in line with the contemporary style of this garden home office. For the convenience of adding electrics, the 45mm roof battens create space for adding recess lights.

Door and Windows

A double-glazed, UPVC reinforced door, secured by a 7-point lock provides access and keeps expensive items secure. The 2 full-length, double-glazed windows allow plenty of natural light inside. The side window pane comes with a half-height opening window (our standard 2.5 model) or you can upgrade to our 2.5+ model which features a half-height opening window. Please select your preference from the drop-down menu when ordering. The door and windows all have grey grained outer and smooth white inner frames, making for an exceptionally attractive appearance. A window vent helps maintain the pleasant working environment.


The garden building is supplied with all of the necessary fixtures and fittings, exterior facias and clear instructions to help you achieve a straightforward assembly. Alternatively, choose Forest Garden's professional installation service as an optional upgrade and everything will be done for you by their expert fitters.

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

Please note that Forest Garden do not provide an electrician service. The walls and roof are, however, designed with space for wiring. Any electrical work should be carried out by a qualified electrician.


Energy Efficiency

With thick insulated walls, floor and roof plus double glazing throughout, this insulated garden room has an energy efficiency rating of 78 (category C). It can reach 82 (category B) by adding a solar PV panel. The energy rating is based on lighting from three 4W LED bulbs and heating from a high efficiency wall mounted heat pump.


Each Xtend Insulated Garden Office comes with a manufacturer's 15 year structural guarantee. The timber comes untreated; it should be treated upon assembly and yearly thereafter. Forest Garden recommend the following treatment products: Restol Wood Oil, Sikkens Cetol HLS Plus, Timmersol ETS Double Protectant, Osmo Country Colour or Osmo Natural Oil Wood Stain.


Free delivery is available to most UK addresses. Some more remote postcodes will incur a surcharge. Our handy postcode checker will provide further details.

  • 15-year structural guarantee
  • Built from modular Structural Insulated Panels (SIPs)
  • 15mm tongue and groove exterior cladding and MDF interior
  • 108mm SIP floor and 122mm SIP roof
  • EPDM weatherproof roof cover with 50-year life expectancy
  • Double-glazed door with 7-point lock
  • 2 large, double-glazed windows
  • Choice of opening window size
  • Available in 3 sizes, with 3 different door and 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


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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