Forest Garden

Xtend 2.5

250cm(h) x 254cm(w) x 290cm(d)

Achieve the work/life balance with the Xtend 2.5 from Forest Garden. This new garden building has everything you could wish for in a home office – contemporary looks, real energy efficiency, ease of construction and keen pricing.

Home Delivery RRP. £8,477.49 Code: XTEND2.5HD
Installed RRP. £10,367.49 Code: XTEND2.5IN

Achieve your 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.

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

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.

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 can be as energy efficient as a new-build home – with an EPC energy rating of B.

All fixtures, fittings and step-by-step instructions included

Click here to view the Xtend Brochure



  • The core structure of an Xtend building is made from SIPs panels - high performance material for building construction. The 21st century way to build
  • 9 7mm thick insulated walls consist of 75mm of polystyrene insulation sandwiched by two sheets of oriented strand board (OSB)
  • Gives structure and insulation in one pre-assembled and cut-to-size panel
  • Total wall thickness including SIPS panels, internal and external cladding and cavities is 177mm
  • Roof is 11mm OSB + 100mm insulation + 11mm OSB = 122mm total


External Cladding 

  • Pre-cut external timber cladding panels for quick and easy assembly
  • No measuring and cutting every single batten and board to size before mounting
  • Cladding panels are simply positioned on the building and screwed into place
  • Panels are made with 15mm thick premium interlocking tongue and groove boards mounted to framing battens
  • Comes untreated and we recommend the application of any of the following:c
  • Sikkens Cetol HLS Plus • Restol Wood Oil • Timmersol ETS Double Protectant • Osmo Country Colour • Osmo Natural Oil Woodstain


Internal Cladding

  • Pre-cut interior MDF panels for quick and easy assembly for walls and ceiling
  • No measuring and cutting every panel
  • Wall panels are mounted to 28mm thick battens creating a cavity perfect for routing electrical wiring
  • Roof battens are 45mm thick to allow for recess roof lights
  • Comes with primer applied – can be painted in a colour of your choice using standard interior emulsion paint
  • The panel design has a vertical beaded profile
  • The floor is left unfinished for you to add your own choice of covering


Roof Covering 

  • External roof covering is made from 1.2mm thick EPDM black rubber
  • It creates a maintenance free waterproof membrane
  • Does not crack, split or rot
  • Does not support moss or algae growth
  • UV stable & environmentally friendly
  • Safe and easy to install – the system is laid with cold applied adhesives (supplied)
  • One piece sheet means no joints and no leaks
  • 50 years roof life expectancy
  • Anthracite grey fascias include


Windows & Doors

  • Window material:  uPVC 5 chamber
  • Window colour: Anthracite grey externally with grained finish Smooth white internally Window locking: Two double clasp, mushroom headed espagnolettes
  • Door material: uPVC  reinforced 5 chamber
  • Door colour: Anthracite grey externally with grained finish Smooth white internally
  • Door locking: 7 point multi-lock with ultion three star security barrel
  • Glazing 28mm, A rated, double glazed, safety glass


Energy Efficiency

  • Highly efficient insulated walls roof and floor
  • Double glazed windows
  • Warm in Winter, cool in Summer
  • Energy efficiency model rating of 78 (category C)*
  • Potential to increase to 82 (category B) with the addition of a photovoltaic solar panel

*based on lighting from 3 x 4 watt LED bulbs and heat from a high efficiency wall mounted heat pump


For full technical specifications click here

For a step-by-step guide on how to build your own Xtend Garden Building, click here.

Dimensions 290 × 254 × 250 cm
Construction Type

SIPs panels with external Tongue & Groove cladding/internal MDF cladding.

Roof Type



None (Kiln Dried)


Natural Timber

Product Size (h x w x d) cm Overall dimension when assembled, including overhangs

250 x 254 x 290

Width at base (footprint) (cm)


Depth at base (footprint) (cm)


Estimated Weight (kg)



Various – see spec breakdown.

FSC Approval


Country of Origin

United Kingdom

Wall Cladding Thickness (mm)

External 15mm / Internal 9mm

Door Type (single / double)


Number of Windows

1 (fixed), 1 (opening)


Yes – Double

Glazing Material


Roof Material Inner

SIPs panels

Roof Thickness (mm)


Roof Material Outer

EPDM Rubber Membrane

Floor Material

SIPs panels

Floor Thickness (mm)


Door Locking (eg: plate/wire hasp & staple)

7 point multilock

Home Delivery Lead Time

3 weeks

Home delivery - 4 - 6 weeks : Installation time - 6 - 8 weeks
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