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Dunster House Ltd.
Incorporated. 1994
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1. Construction options
£5399.99
£9588.99
2. Window and door options
3. Optional extras
4. Delivery choices
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Two Person Delivery
Collection: Monday – Friday (9:00 – 17:00)
£0.00
Total: 
£5,399.99
inc. VAT
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External Width:3.22m (10' 6")
External Depth:3.32m (10' 10")
Ridge Height:2.49m (8' 2")
Internal Eaves Height:2.06m (6' 9")
Door Walkthrough Height:1.94m (6' 4")
Door Opening Size:0.69m x 1.94m (2' 3" x 6' 4")
Overall Wall Thickness:117mm
External Timber Thickness:12mm Tongue and Groove
Framing:70mm
Insulation Thickness:25mm
UPVC colour:White included in price. Upgrade for wider colour range as shown
Internal Finish:10mm Plasterboard
Internal Area (m2):5.69m2
Wall U-Value (W/m2k):0.54 W/m2K
Double Gang Plug Sockets:2
Halogen Downlights:4
Consumer Unit:Included
Timber:Pressure Treated
Guarantee:10 Years Against Rot and Insect Infestation
Insulation Material:Polyurethane
Glazing Material:28mm Double Glazed, Toughened Glass
Roof Covering:EPDM
Roof:45mm Insulated SIP Panel (10mm MFP / 25mm Insulation / 10mm MFP)
Floor:45mm Insulated SIP Panel (10mm MFP / 25mm Insulation / 10mm MFP)
Floor Bearers:Pressure Treated
Door Style:uPVC Patio Door
Door Material:Steel reinforced 5 Chambered uPVC profile
Door Locking System:Multi point locking system with 6 pin euro cylinder lock barrel
Windows:1 Door Side Panel and 0 Opening
Window Locking System:Multi Point with Mushroom Headed Espagnolettes
Gaskets:On all Windows and Doors
Base Option:RapidPad Foundation System
Approx. DIY Assembly Time:4 - 5 Days*
*This is an approximate time only, based on 2 people. Assembly time may vary depending on season/weather conditions, foundation type, ability of those constructing, etc.
Please Note:All fixings needed for assembly are supplied
Please note:All wood is planed and pre-cut (with exception of trims), for quick and easy construction.
Please Note:All sizes are approximate
Description

If you want to become your own boss then why not look into purchasing one of our fantastic Alexander MKIII Garden Offices. Ever thought about how nice it would be to wake up and only be a stone’s throw away from your warm and cosy office? Well your dreams can become a reality if you were to purchase an Alexander MKIII Garden Office from Dunster House. Cut out the hassle of the commute and daily distractions that come with working in a busy office.

Product Features
 
Garden Offices Avoid Planning Permission
Garden Offices Avoid Planning Permission II
 
Avoid Planning Permission
 
All our Garden Offices are under 2.5m high so that under permitted development rights you can place the building within 2m of a boundary if you wish to. Please be aware that any building over 2.5m high needs to be placed over 2m away from any boundary. If you want to find out more about planning permission click here.
 
Garden Offices 10 Year Timber Guarantee
Garden Offices 10 Year Timber Guarantee II
 
10 Year Guarantee
 
All of the exterior timber of your Garden Office is pressure treated. We offer a genuine 10 year guarantee against rot and insect infestation on all of these parts. So you won't need to worry about little critters causing havoc or rot damaging the timber.
 
Garden Offices Energy Saving Insulation
 
Energy saving insulation
 
The walls, floor and roof of our garden offices are all insulated to lower energy costs. We use Polyurethane to insulate our garden offices, which is proven to retain heat better than cheaper alternatives such as polystyrene or rockwool. The U values of our insulation are as follows: 0.64 W/m2 K in the roof, 0.62 W/m2 K in walls, and 0.70 W/m2 K in the floor.*Insulation means a reduction in loss of heat from an area that has been heated to a different temperature. If no heat has been applied, the insulation will be nominally the same as the outside temperature.
 
Garden Offices 28mm Sealed Unit
 
28mm Double Glazing
 
We don't compromise on quality just because it's a garden building. Our garden offices have domestic style uPVC windows and doors, making your garden office secure and highly insulated. The 28mm sealed double glazing provides improved heat and sound insulation.
 
Garden Offices Multipoint Locking Windows & Doors
Garden Offices Multipoint Locking Windows & Doors II
 
Multipoint locking windows & doors
 
Our garden offices come with domestic grade multipoint locking windows and doors. Great for securing your garden building and its contents! Euro cylinder locks are used in our uPVC doors in a 9 point locking system to ensure maximum safety and security.
 
Garden Offices Smooth Plasterboard Interior
Garden Offices Smooth Plasterboard Interior II
 
Smooth plasterboard interior
 
The interior walls and ceiling of our garden offices are covered in uninterrupted plasterboard for a clean, sleek and professional look. Complete with coving and skirting boards you have a look that is the same as you would expect to find in a house.
 
Garden Offices Easy To Build Panel System
Garden Offices Easy To Build Panel System II
 
Easy to build panel system
 
Using a technique unique to Dunster House, we've been able to create panels that simply slot together, ensuring the rigidity and strength of this office surpasses many alternatives and is quick to build.
 
Garden Offices Halogen Spotlights
Garden Offices Halogen Spotlights II
 
Halogen spotlights
 
Recessed halogen spotlights are located around your office to provide plenty of light, controlled by a light switch just like they would be in your home!
 
Garden Offices Electrics Included Socets
Garden Offices Electrics Included Fuse Box
 
Electrics Included
 
Everything you need to run electrics within the Garden Office is included. We use our own qualified electricians to install and test the electrics if we are installing the building for you. The only thing we don't do is the connection between the Garden Office and your existing electrical supply.
 
Garden Offices EPDM Roofing
Garden Offices EPDM Roofing II
 
EPDM Roofing
 
Our Garden Offices feature an EPDM covered roof. EPDM has been widely used in commercial and residential flat roof applications for over 30 years and has an enviable record for durability and waterproofing. We’re so confident in our choice of roof material that we give a 10 year guarantee against rain water penetrating it. Being made from one large sheet it also means that the roof won’t be covered in clout nails as is the case with felt roofing, but please be aware that there may be some bubbles trapped under the EPDM material when it is laid and/or creases. The pictures above show a typical EPDM roof installation on one of our offices
 
Garden Offices Fixings Included
Garden Offices Fixings Included II
 
Free fixing pack
 
We include all of the screws, nails and fixings needed to put your garden building together, not everyone is that thoughtful! So there's no need to worry about the type of screws, or length of nails etc you might need to get started, it's all there in the pack!
 
Garden Offices Fully Pressure Treated
Garden Offices Fully Pressure Treated II
 
Fully pressure treated
 
Our Garden Offices are made using non-toxic, pressure treated timber. This process forces wood preservative deep into the pre-cut timber using a large pressure treatment vat. This allows us to offer our customers a 10 year timber guarantee against rot and insect infestation.
What is a Garden Office?
A Garden Office is a garden building used to create an office away from your home, separating your work life from your home life.

Dunster House Garden Office is made from slow-grown spruce, 4mm toughened glass and polyurethane insulation, creating a thermally efficient, smart looking product.
What foundation do I need for this Garden Office?
We recommend a flat, level concrete base at least 100mm bigger on each side. e.g. A 4m by 3m building would have a base of 4.2m by 3.2m See more details here.
Do you offer any guarantees or warranties on this product?
We offer a genuine 10-year guarantee against rot and insect infestation on pressure treated timber. We also offer a 10-year guarantee on the Garden Office roofing material. This is called EPDM, and we guarantee it against water permeation through the material.
How high is this Garden Office?
It is 2.49m (8' 2") high
Do I need planning permission for this Garden Office?
Take our quick survey to find out!
Is this Garden Office insulated?
This Garden Office contains floor, roof and wall insulation. The type of insulation we use is called Polyurethane, which is proven to retain heat better than polystyrene or rockwool. This Garden Office also feature 28mm double glazed units to aid in retaining heat.
Does this Garden Office come with electrics?
This Garden Office comes with a fuse box, halogen spot lights and plug sockets, to help get you up and running quicker.
Does this Garden Office need treating?
This Garden Office is pressure treated so will not need retreating for up to 10 years. However, you may wish to treat with water repellant for timber maintenance.
Where can I visit you? Do you have a store near me?
We have 6 branches across the UK. Click here to find the nearest one!

We deliver our garden buildings to mainland United Kingdom (England, Wales and Scotland). Some exceptions apply; these are illustrated on the map below.


Scottish areas may be subjected to slightly longer delivery turnarounds, please contact us for details. FREE delivery on selected products over £200 to mainland England and Wales.

Delivery Price

Green - £19.99 delivery fee on all orders under £200.
Yellow - £59.99 delivery fee.
Orange - £84.99 delivery fee.
Red - We are unable to deliver to these areas.



Assisted Delivery

If you cannot provide an able bodied person to offload the vehicle with the help of our driver, we can provide additional manpower with our Assisted Delivery Service. The driver will arrive with some help to unload the lorry, meaning that you can put your feet up.


We offer this service on all items that are delivered, we do not offer this on our couriered products. Prices for this service can be found on individual products.


Should you require further information on our standard or assisted delivery services, please contact a member of our Sales Team.


Scottish areas may be subjected to slightly longer delivery turnarounds, please contact us for details.



Alexander MKIII - Left W3.2m x D3.3m

This image shows a brief reference to how your products will arrive. All of our garden buildings are made from kiln dried quality graded timber, if it is to be stored prior to construction and treatment all parts must be covered to prevent moisture from warping and rotting the timber.

Overall U-Value : 0.88
U value button