SKU: 36578586111

Forest Garden Xtend 4 x 3.42m Insulated Garden Office with 1/4 Window

Sale price$5590.08 Regular price$6211.20
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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Description

Forest Garden Xtend 4 x 3.42m Insulated Garden Office with 1/4 WindowForest Garden Xtend 4. 0M 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 efcient materials and is underwritten with a 15 year

Forest Garden Xtend 4.0M

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 ?oor 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.

Features:

STRUCTURAL INSULATED PANELS (SIPS)

  • 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

Tech Specs:

  • Weight: 2400 kg
  • Dimensions: 342 × 404 × 250 cm
  • Construction Type: SIPs panels with external Tongue & Groove cladding/internal MDF cladding.
  • Roof Type: Pent
  • Treatment: None (Kiln Dried)
  • Colour: Natural Timber
  • Product Size (h x w x d) cm Overall dimension when assembled, including overhangs: 250 x 404 x 342
  • Width at base (footprint) (cm): 403
  • Depth at base (footprint) (cm): 304
  • Estimated Weight (kg): 2400
  • Material: Various – see spec breakdown.
  • Country of Origin: United Kingdom
  • Wall Cladding Thickness (mm): External 15mm / Internal 9mm
  • Door Type (single / double): Single
  • Number of Windows: 2 (fixed), 1 (opening)
  • Glazing: Yes – Double
  • Glazing Material: Glass
  • Roof Material Inner: SIPs panels
  • Roof Thickness (mm): 122mm
  • Roof Material Outer: EPDM Rubber Membrane
  • Floor Material: SIPs panels
  • Floor Thickness (mm): 108mm
  • Door Locking (eg: plate/wire hasp & staple): 7 point multilock
  • Home Delivery Lead Time: 3 weeks
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 36578586111

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4.7 ★★★★★
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michele
Whiting, US
★★★★★ 5
So far, so good
Color: Black, Number of Items: 1, Color: Black, Number of Items: 1
When Covid hit early 2020, I was sent home to work remotely for the first time in my working life. However, my old chair that is pictured on the right is about 25 years old and no longer has any butt cushion. It quickly became painful to work in that chair all day. I have since moved to a new state and found a remote job I will be starting soon so I decided it was time to upgrade the chair. This is a decent chair if you are on a budget like I am and you are not hard on your stuff adding premature wear and tear. For me, it has good lumbar support which I needed, and more cush for the tush! I am a proportionate 5'2" female and about 125 to 130 pounds. The seat has just enough room for my butt but I don't think I would recommend this for larger people. I would look into sizing up to the big and tall chair. Take note of the seat and back size to know what would work best for you but this chair feels small yet good sized for me only because I was able to go by the measurements of my old chair. Might even be best for you to go into an office supply store to test out chair sizes for comfort before making a purchase. Sometimes I like to sit criss-cross applesauce and this chair has a very nice and smooth rocking motion after loosening the tight/loose knob for reclining and is so comfortable for me that I may fall asleep on the job and get fired. The back of the chair hits just above my neck so I am able to tilt my head back a bit to let it rest since my upper back and neck sometimes go numb after sitting for too long. Ugh, it's just so much fun getting older!! Assembling the chair was easy until I got to step 4 to put the back of the chair on. If you have another person to hold the chair back for you to align with the chair arm holes and screw in, then you should be OK, but since I had no one to help, I had to take the seat off and lay it down. I still struggled to align the back while the arms were attached to the seat so I removed the arms from the seat and attached them to the chair back and then aligned the seat with the arms and screwed them in. Once done, I inserted the completed assembled seat, chair back, and arm attachments back onto the wheels. The wheels glide very easily and will take you across the room after one push. I am writing this review the same day I got the chair so will update if I run into any issues. Otherwise, I recommend this chair.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2022
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Verified Purchase
lisa
Lexington, US
★★★★★ 4
Comfortable but lack of back support on this chair
Color: Black, Number of Items: 1, Color: Black, Number of Items: 1
I give this chair a 4 star not a 5 star review. Reason for that if you look for the first picture I pst you can see from the back of the chair how it reclines. There is no adjustment to make the back rest come up straight so when your working all day at the desk you is an upright right position. I have to put a pillow behind my back for support cause while working leaning back is uncomfortable and who wants to lean back while working. so there is a lack of back support. .Great gaming chair for that reason. Though I really like the looks and the color of the chair. The material was very soft and the quality was made well. The chair you can make go up or down for the height which is nice. The ability to be able to move the char around while sitting is a plus and the wheels move smooth and with ease. I had to put this together which was simple to do and came with everything I needed when open the box. So before buying if the back support and leaning back isnt an issue for you then this would be the perfect chair for you. Please not the first picture with the darker rug is the chair I got , second picture isnt mine but for a review that their chair was up straight. Isnt the way mine should have come. I didnt questioned or return it because it was so heavy and bulky to take back to a UPS store. I just kept it because everything else was great.
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Reviewed in the United States on January 29, 2026
T
Verified Purchase
Tammy Hood
Omaha, US
★★★★★ 5
Beautiful chair with real leather
Color: Light Brown, Number of Items: 1
BEAUTIFUL CHAIR.... so comfortable and worth the price. Extremely easy to put together!! Highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
H
Verified Purchase
Harold
Lake Worth, US
★★★★★ 5
Great price and Quality
Color: Khaki, Number of Items: 1
Best money ever spent on an office chair. At the time of purchase, it was less than half the price of local retail stores. Once we received it and put it together, it was top notch. Better than expected. Now time will tell how long it stays that way. Very comfortable, strong material, and easy to adjust.
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Reviewed in the United States on May 23, 2026
A
Verified Purchase
AKO
Omaha, US
★★★★★ 5
Comfortable Even After Long Hours
Color: Black, Number of Items: 1
I purchased this chair for my husband’s home office, and it has been a great choice. The height and angle can be adjusted very easily, making it comfortable to customize. Assembly was also simple and straightforward. The size is just right, and it remains comfortable even after sitting for long periods of time without causing fatigue. Overall, the quality exceeded my expectations for the price. If it ever breaks, I would definitely purchase the same one again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026

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