Due to COVID-19 delivery times on some products may be extended. Please check the product description for more information.

Forest Xtend 4.0M – Outdoor Wooden Garden Building Summerhouse Office


In stock

Product Description

The Xtend Range from Forest Garden is ideal for acheiving your perfect work/life balance; these high quality buildings are ideal as a home office or as a stylish place to relax all year round.

These buildings are designed to be enjoyed during every season, the Xtend delivers real energy ef?ciency with its double glazed windows and highly ef?cient insulated walls. The Xtend offers an EPC energy rating of B and a 15 year structural guarantee.

The Xtend garden building is constructed from high quality, energy ef?cient materials and is underwritten with a 15 year structural guarantee.

All fixtures, fittings and step-by-step instructions are included, the pre-cut, modular SIP panels makes for an easy assembly.

Product Features:

Structural Insulated Panels (SIPS):

  • The core structure of an Xtend building is made from high performance SIPs panels
  • 9 7mm thick insulated walls consisting 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.

External Cladding:

  • Pre-cut external timber cladding panels for quick and easy assembly
  • Cladding panels are positioned on the building and screwed into place
  • Comes untreated.

Internal Cladding:

  • Pre-cut interior MDF panels for quick and easy assembly for walls and ceiling
  • 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 ?oor is left un?nished for you to add your own choice of covering.

Roof Covering:

  • External roof covering is made from 1.2mm thick EPDM black rubber
  • Creates a maintenance free waterproof membrane
  • Will not crack, split or rot and does not support moss or algae growth
  • UV stable & environmentally friendly with 50 years life expectancy
  • Anthracite grey fascias include.

Windows & Doors:

  • Constructed from uPVC 5 chamber
  • Windows lock with two double clasp, mushroom headed espagnolettes
  • Anthracite grey externally with grained ?nish, smooth white finish internally
  • Door locks with a 7 point multi-lock with ultion three star security barrel
  • 28mm window glazing with A rated, double glazed, safety glass.

Energy Efficiency:

  • Highly ef?cient insulated walls roof and ?oor
  • Double glazed windows
  • Energy ef?ciency model rating of 78 (category C) with the potential to increase to 82 (category B) with the addition of a photovoltaic solar panel.

Product Dimensions:

  • Height: 250cm
  • Width: 404cm
  • Depth: 342cm
  • Internal Height: 206cm
  • Internal Width: 367cm
  • Internal Depth: 268cm
  • Extrernal Wall Cladding Thickness: 15mm
  • Internal Wall Cladding Thickness: 9mm
  • Wall Thickess: 177mm
  • Floor Thickness: 108mm
  • Roof Thickness: 122mm
  • Weight: 2400kg.

Additional Information

Weight 2400 kg
Dimensions 405 × 342 × 250 cm

Forest Garden

Roof Type









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Forest branded products (including sheds, storage, wooden furniture, arbours and arches etc.) vary significantly in their delivery times and are updated regularly. Please contact us to confirm the exact delivery time for your item.

You will be contacted and the delivery booked with you in advance, there is no need to wait on estimated days. The booked delivery date will be the one your order is delivered on.

Delivery price is to England, Wales and lower Scotland only. A surcharge may apply to other areas and the islands (we cannot deliver to some of the islands directly, please contact us for assistance).

Made-to-Order Gazebos:

These are delivered direct from the manufacturer and can take up to 12-14 weeks to deliver and install. Installation takes place after delivery with an arranged date. Delivery price is to England, Wales and lower Scotland only. A surcharge may apply to other areas and the islands (we can not deliver these to some of the islands directly so please contact us for assistance).

Log Cabins:

Log cabins are delivered direct from the manufacturer and can range from 2-8 weeks for delivery and installation. Delivery price is to England, Wales and lower Scotland only. A surcharge may apply to other areas and the islands (we cannot deliver these to some of the islands directly so please contact us for assistance).

If you feel that your item is delayed then please contact us so we are able to help you.

About Our Assembly & Installation Service

So you’ve chosen your shed and you want it assembled and that’s where our installers come in.

At Pure Garden Buildings, we offer a professional installation service taking the pressure off you. So if you require a shed installation in your garden or you’re an Architect, Developer, Business, School or Government Body we can take care of the build process for you.

Simply Choose the “Assembly” option when placing your order or speak to one of our team about booking your installation.

After you have placed an order and a delivery date has booked, notify us and the install team will be in contact to make the necessary arrangements with you for your install.

Installation FAQs (Frequently Asked Questions)

How long do I have to wait for an install?

The date for installation will be arranged with you by the installation team once a delivery date has been booked.

My install is due, what happens now?

Fantastic stuff, your building will have already been delivered may be coming with the installer, if your building is delivered to you prior to the install date please check off the contents from the list on the instructions to make sure everything is present and correct.

Although we try and make sure everything is perfect we are all only human after all, so we ask you to quickly check and get in touch if you have any concerns so we can sort them out before the installer arrives.

We will pre-book an installation date with you in advance if you are not able to be in or grant access, then please let us know in advance or arrange for a friend or neighbour to be there in your place.

The installer will normally phone you the day before or the morning of your install date to check that everything is all still fine to go ahead (although we can not guarantee this service).

My install is due today, what can I expect?

Your installer(s) should arrive within the timeframe agreed (if there is an unavoidable delay then will notify you as soon as reasonably possible).

When the installer/s arrive they will just double check that your base is suitable and everything is present for the installation, then they will start the erection process of your building for you.

The installers will be happy to answer any questions you may have.  If you want to oversee the build they are more than happy for you to be there.

If you want to get on and leave them to it, they will be able to give you an estimated time that the install should be nearing completion.

My installation is complete, is that it?

Yes, you’re good to go! The installer will do their own checks of the building and then ask you to have a look with them, they will show you the completed job, take some photographs and ask you to sign for their work.

Assembly/Installation Requirements

So there are no surprises on the day please read the following information about what is required.

Our base prices for installation make the following assumptions

1. There is clear access to the garden or assembly site.

2. It’s not further than 40 meters from the delivery point to the
assembly point. Although we can move the shed from one point to another for you, the price quoted only allows for a certain amount of time.

Long distances like rear access from further down a street, etc. will take more time that has not been quoted for in the standard price.

3. The ground is flat (not sloping for base kits).

4. A solid and suitable base is in place and that base is both flat and level.(for more information please see our “Shed Base Guide”).

5. Delivery and installation may not be on the same day.

6. There is access (min 60cm) all around the final install position (the install team will need to get to all sides of the shed to properly install the roof).

7. Electricity must be available upon request.

8. There is parking or a suitable loading/unloading area at the assembly address
with free parking close by. Permit holders only roads will require you to provide a permit.

9. Unless agreed in advance a person over the age of 18 must be available at the time of assembly.

The customer is responsible for and understands the following

1. We are unable to carry a shed through your
property. if a shed or garden building must be taken through a home then you will need to already have done this before the assembly team arrives or upon arrival.

2. If the assembly person or team arrives to find the
base is not suitable, the job may not be able to go ahead on that day, but the booking will still have to be paid in full.

3. If we are asked to and agree to install on a base
that is not suitable, then we do so on the understanding that you acknowledge this may affect the look and functionality of the building and we will not be held liable for issues that arise as a result.

4. The installer/s are unable to carry out other jobs or repairs for you while they are there.

5. If you have pets, the area must be free of any mess and properly cleaned before the assembly taking place.

6. We may ask for dogs to be kept away from the area while the assembly is taking place.

7. Any trees, bushes, etc. that are overhanging must be cut back prior to our arrival.

8. Grass must be reasonably short around the assembly site.

9. Manholes and drains in the area must be covered, free from mess and clean.

10. If any additional jobs are carried out for you at your request these will be chargeable at £30 + VAT per hour (chargeable in 1-hour increments).

Assembly of timber base kits assumes the following

1. The ground is not more than 3 inches off level across the entire span of the base.

2. The area is not partly paved, concrete, blocks, bricks or anything that will have to be removed before assembly.

Note: we are unable to perform any groundwork’s.

Although we will make every effort to accommodate requests, these are best made in advance so there is no delay in the assembly service or unexpected surprises on the day.

Because we work with a number of different manufacturers and brands delivery and assembly won’t be on the same day.

Please understand that our standard pricing is simply for the assembly of a retail product and nothing else (Our installers are not builders, carpenters or electricians) and can not perform other tasks for you.

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