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Dunster House Ltd.
Established 1994
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Lines open until 8:00PM
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responsibly sourced timber
millions of products
Construction Options
£6,179.99 †
SAVE £660
Insulated Walls + Insulated Floor + Insulated Roof + 24mm Double Glazing
Info Insulation Options
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Optional Extras
Foundation Options
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Fixings Included

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!

Customisable Panel Configuration.

Dominator Garden Office Customisable Configuration
Customisable Panel Configuration
Wish to customise your Garden room? As the wall panels supplied are of the same size, this means that a wall panel can be replaced by a window panel (for instance) and the wall panel used elsewhere, the doorway (2 panels) can be changed with any mix of 2 panels.

You could put the door on a side aspect and have a wall of windows to the front aspect if that is how you want your Dominator to look.

Customise the Dominator to a configuration that works for you!

Low uValue walls, roof and floor

Fully Insulated Garden Office - Dominator
Insulated Low U-Value Walls, Roof and Floor
A low U-Value means that your walls, roof and floor radiate less heat, in reality, you keep cool in the summer and warm in the winter whilst having lower energy costs. The Dominator has low U-Value walls, roof and floor thus keeping your running costs down. The walls have a U-Value of 0.63, roof U-Value is 0.49 and the floor U-Value is 0.64.

The lower the U-Value the better! Be weary of any competitor products on the market that don't advertise U-Values.


SuperFOIL Insulation





SuperFOIL Multi-layer Foil Insulation 

Lightweight and flexible. SuperFOIL is ideal for use in Garden rooms like the Dominator. It is preinstalled in the roof and wall panels and is just unrolled across the ground bearers for floor insulation. As it comes on a roll the floor installation is quick and very easily installed. 


If you had any doubts as to the quality of the insulation, don't!  Firstly, it's made from 40% recycled material, so it's great for the environment, but not only that it's of a high enough standard that it can be used in homes as part of roof, walls and floor insulation. 


When comparing competitor products, be sure to check what insulation is used. Some competitors may use cheap materials such as bubblewrap which is nowhere near as effective! 


Pressure Treated Bearers

Pressure Treated Bearers
Rotted Untreated Bearers
Pressure Treated Bearers

All of our garden buildings have pressure treated floor bearers as standard. This treatment prevents the timber bearers from rotting for up to 10 years and causing your garden building to sink. Pressure treatment forces the wood preservative into the timber rather than simply dip treating (essentially just covering the exterior) like many companies still do. Who wants to have to annually deconstruct and re-treat the bearers each year!


Due to this costly but effective process, we can offer our customers a genuine 10-year guarantee against rot and insect infestation on the bearers.  We do however recommend applying a good quality water repellent to the timber to prolong the longevity of the timber. Shockingly many of our competitors still offer untreated bearers to keep their costs down, so beware!


All our Pressure Treated timber is User Class 3.

Tall walk through height

Dominator Garden Office Tall Walkthrough Height
Tall Walkthrough Height

There's no need to 'duck' on the way in through our quality French doors. With a tall walkthrough height of 5'11" (1.82m) you’re free to move in and out of your office concussion free. Others have tried to copy us but include the doorframe as part of their walkthrough height.

Heavy Duty Roof Purlins

Dominator Garden Office Heavy Duty Roof Purlins
Heavy Duty Roof Purlins
The Dominators heavy dury tapered roof purlins are an impressive 140mm x 40mm. Substantial and capable of sustaining the roof and ceiling of the Dominator without sagging. Built to last the Dominator is engineered to weather the UK climate with ease. 

Avoid Planning Permission

Dominator Garden Office - Avoid Planning Permission
Avoid Planning Permission
This building is under 2.5m high. Why does this matter? Under permitted development rights, buildings under 2.5m high can be placed as close as you want to a boundary (eg. a fence line) without planning permission. Buildings that are over 2.5m high need to be placed over 2m away from any boundary (eg. a fence line), which could lead to a lot of wasted space. If you want to find out more about permitted development rights see our planning guide.

Multipoint Locking Windows

Multipoint Locking Windows
Just like our doors, we use espagnolettes, which pull the window tightly into the draft seals attached to the frame. We also supply a solid handle and key that allows you to lock the window whilst you’re away. Most maunfacturers  only supply a multi-purpose stay arm opener for both locking and keeping the window open.

Beaded Windows

Internal Beaded Windows - Dominator Garden Office
Internally Beaded Windows
Both our doors and windows are fitted with internal beading used to secure the glazing in place. This beading style is typically found in uPVC windows and is a proven method of security. However, there are still some companies that externally bead their windows. Allowing intruders to remove the glazing from the outside of your garden house and gain access.

Multi lock system

Safe and Secure 4 Point Locking System Dominator Garden Office
Domestic Style Door Lock System

Your security is of the utmost importance to us. You have invested your precious time, thought, and money into creating your perfect cabin, therefore we want to ensure your valuables are as safe as they would be inside your own home. 

Our doors feature an industry-leading domestic standard 4-point locking system consisting of espagnolettes, which slide in opposite directions as well as a 6-pin Euro cylinder, which has been tested to BSEN 1303:2005 classification. Making it difficult for intruders to break in and steal your precious belongings.

15mm Shiplap Cladding

Dominator Garden Office 15mm Shiplap Cladding
15mm Shiplap Cladding

Unlike some, we only use full-length cuts of shiplap cladding on our garden offices, which comes in a substantial thickness of 15mm. The advantages of using shiplap cladding is it's robust, and sturdy. Our cladding interlocks creating a strong watertight bond that allows rain to run off the office quicker, it also creates an attractive, professional appearance, that’s certain to wow potential clients if you're running your business from home.

Vents included AS STANDARD

Dominator Garden Office Vents Included as Standard
Vents Included AS STANDARD

Ventilation is essential for the longevity of the Dominator. This is to ensure airflow and minimise moisture at all times. We have provided ample vents to ensure that condensation is never a problem. Some competitors charge you extra for these or do not even offer them.

Easy build panel system

Dominator Garden Office Easy Build Panel System
Easy Build Panel With External 15mm Shiplap Cladding

The Dominator uses a prebuilt panel that is easy to handle and work with. The inside of the panel is pre-cladded the external is not. This allows easy access when fixing the panel to the floor bearers and to adjacent panels.

Prebuilt panels allow rapid construction and less measurement errors to occur.

Preassembled Windows

Preassembled Windows
When constructing your log cabin, you do not need to worry about putting our windows together as they come preassembled. So, you simply need to slot them in.

Designed for the DIY Market

Designed for the DIY Market 
All our garden buildings have been designed on the basis that any competent DIY customer should have no problem installing a product themselves in a short amount of time. You do not have to be an expert at DIY to build a Dunster House garden building, as we do provide you with comprehensive pictorial instructions. We totally understand that DIY is not for everyone therefore, you may want to consider getting in touch with a local carpenter or handyman to install it for you. But before you do, check out our construction video and decide for yourself! 

Have a question?

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.

A Dunster House Garden Office is made from slow-grown spruce, 4mm toughened glass and polyisocyanurate insulation (SuperFOIL on our Dominator range), 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.

How High Is This Garden Office?

It is 2.48m (8' 1") high

Do I need planning permission?

Due to the unique design of a Dunster House product, in the vast majority of cases our garden buildings can be installed without the need for planning permission.

However, there are a few other factors to consider:

As all properties are different in size, shape and style we can only advise based on how we have designed our products, not on your property.

When to consider planning permission:

  • - If the garden building exceeds over 2.5m tall - the majority of Dunster House buildings do not exceed this.
  • - If you intend on putting an outbuilding in front of the main elevation of your property (as it was originally built or as it was on 1st July 1948) will require Planning Permission.
  • - If you live in a listed or graded building
  • - If you live in a designated area such as areas of outstanding natural beauty, national parks, world heritage sites and conservation areas.
  • - If there is a possibility that over 50% of your garden would be taken up by outbuildings.

Click here for more information on Garden Building Planning Permission in the UK.

Still not sure?

If you are still in doubt, we highly recommend getting in contact with your local authority before making a final purchase.

Does This Garden Office Come With Electrics?

Owing to the multitude of possible configurations available for power and lighting we have left these offices for customers to supply and create their own, exactly how and where they want them.

Do you install?

Unfortunately, we do not offer installation currently. All our garden buildings have been designed on the basis that any competent DIY customer will have no problem installing a product themselves in a short amount of time.

You do not have to be an expert at DIY to build a Dunster House garden building, as we do provide you with comprehensive pictorial instructions. Also, if you prefer video tutorials, we do have a selection of videos on YouTube which will support you in building your product.

We totally understand that DIY is not for everyone and it can be very overwhelming to start building your own garden product. Therefore, you may want to consider getting in touch with a local carpenter or handyman to install it for you.

If you do take on the challenge to put your garden building together, we are always here to help. Do not hesitate to contact us at any stage of putting your product together and we can provide you with all the assistance you may need. Contact our customer service team via email at cs@dunsterhouse.co.uk.

Do you deliver to Scotland?

Yes, we do! Some postcode restrictions do apply however we are pleased to be able to deliver to many parts of Scotland.

For more information - Where Do We Deliver?

Is this Dominator Garden Office insulated

The Dominator Garden Office contains floor, roof and wall insulation made from SF6 SuperFOIL, which is proven to retain heat better than polystyrene or rockwool. The Dominator also features 28mm double glazed units to aid in retaining heat.

Does Dunster House Responsibly Source Its Timber?

Dunster House commit to continuously improve the sustainability level of our sourcing, by favouring stricter more credible certification and verification standards, and sourcing requirements. We are committed to avoiding sourcing from unknown or unsustainable sources.

Where possible, Dunster House are committed to procuring wood products that have been certified against credible, internationally recognised standards for good forest management, to ensure that material originates from well managed forests. In line with this, we preference products certified to the standards of FSC (Forest Stewardship Council) and PEFC (Programme for the Endorsement of Forest Certification).

What about illegal timber?

Dunster House are committed to sourcing only material that is produced, processed and traded according to applicable legislation.

What is your Environmental Responsibility policy?

Dunster House are committed to promoting responsible stewardship of the environment and its natural resources. We are committed to lessening the impact on the environment caused by our own activities, and those of our suppliers.

Do you have a Supply Chain Management policy?

Dunster House will ensure that information about suppliers and material is gathered as part of the RPP. We will ensure regular engagement with our suppliers to ensure compliance with UKTR requirements, working with them to ensure continuous improvements. We will also specify that, wherever possible, that material sourced is covered by FSC and PEFC, to ensure responsible forest management.

What are u-values?

U-values tell us about the heat loss properties of the material you are measuring. The lower the number, the better insulated the Garden Office will be. Find out more here.

Have a question?

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

Postcodes affected include:

  • TR 
  • TQ6, 7, 8, 9 
  • EX19, 20, 21, 22, 23, 38, 39
  • LD2, 3, 4, 5
  • PL10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 
  • SA3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 70, 71, 72, 73, 61, 62, 63, 64, 65, 66, 67, 68 and 69
  • KW 
  • HS 
  • ZE 
  • KA27, 28 
  • IV1, 4, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 63 
  • PA20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80 
  • PH32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44 

Delivery Price

Green - Free Assisted Delivery

Red - We are unable to deliver to these areas.

Purple - For orders to Ireland & Northern Ireland, please visit our Distributor in Ireland here.

Delivery Service

All of our products are delivered using our own fleet of vehicles, not sub-contractors. We have a large number of vehicles dedicated to delivering our quality products so we can guarantee maximum care is taken during the delivery process.

Our deliveries take place Monday to Friday between the hours of 8:00am and 6:00pm.

When the delivery vehicle is unloaded, it is important that you check to make sure all of the items and instructions have arrived and are correct. You will also receive a component list to check your items against. If anything is missing or damaged, it is essential that you note this on your paper work when you hand it back to the delivery driver.

Prices for our delivery services can be found on individual products.

Please note that goods will be delivered to the first point of contact at the front of your property e.g. on your driveway. This must be within 20m from the delivery vehicle (Safely Parked at Kerbside). Our team will be responsible for assessing the risk of carrying out delivery upon arrival at the property.

Should you require further information on our assisted delivery services, please click here to read our Terms and Conditions, alternatively you can contact a member of our Sales Team.

Q: Where can I find more information?

A: If you have any questions regarding your delivery, you can telephone our Dispatch Team. Contact details for the Dispatch Team of your nearest branch can be found on your order confirmation. If you need to track your delivery or access your manuals in advance of your delivery, you can visit the Customer Log In Area of our website https://dunsterhouse.co.uk/customer-login-area/log-in

Thank you for taking the time to read about our terms and advice during this period. We hope you can enjoy your Dunster House garden product for many years to come.

To ensure the very best quality, we only use slow-grown White Spruce Timber, which is harvested in cold climates to ensure solid, dense log rings. This gives the wood superior strength and longevity, and also a much more consistent colour than the likes of Pine.


Despite the care we take in selecting the very best Timber available, it’s not like predictable brick or cold steel, this natural material has characteristics and quirks unique to every log.


Because our timber logs once fed water and nutrients back and forth from its roots to its leaves, its very nature is to be porous and swell up when it gets wet. Any wooden product will do this throughout its life, but there are a few things you can do to help limit this movement.


These include:

1. A great design!

  • Don’t worry, we’ve got this one covered. We’re experts when it comes to all things timber, so we have designed our products from the ground up with its natural properties in mind.

2. Water Repellent Treatment.

  • How you customise and decorate your product is up to you, however we would recommend that you use an appropriate water repellent treatment. This really helps minimise the amount of moisture that the timber can absorb. Therefore minimising the risk of any major movement.
  • (Please note: water repellent treatment is not the same as pressure treatment, which protects against rot and insect infestation, and which we guarantee for 10 Years!)
  • On pressure-treated timbers, you may notice some subtle striation marks. These marks sometimes appear during the drying process of timbers. Fear not! In time, the marks will begin to fade as the sun starts to lighten the wood.




3. Ventilation.

  • Keeping your timber building ventilated is no less important than keeping your house well ventilated. This is especially true if you plan to cover up your floorboards with something (double check with an expert, that the material is suitable to do so), as moisture can become trapped between layers of non-breathable materials and build-up, leading to floors becoming rotten.

4. Regular Seasonal Maintenance.

  • Whether you opt to build your product yourself, don’t be afraid to tighten the odd bolt here and there. Your product is a life improving investment, so it’s only right to give it some love and care from time to time. Make sure that it’s properly treated before the rainy months, and you make adjustments to doors and window frames, when needed.


Natural Timber Properties

After building your timber product, this natural construction will begin to ‘settle’. This means that you will likely see some natural timber imperfections appear. These types of natural imperfections can include:


  • Cracks


Cracks On Wood


  • Splits

Splits On Timber Held With A Green Rounded Safety Cap

  • Shakes


Shakes On Wood Panel


  • Warping / Twisting

Warped wood panels, twisted Wood panels


  • Expansion and Contraction


Expansion And Contraction Of Wood On Garden Building


Please be aware that, as these are natural timber properties they are not considered as defects under our Terms & Conditions (for more information, check out our Ts&Cs here). However, in most cases, these imperfections will not impact the integrity or function of your timber product, and/or can easily be rectified. For advice on how to rectify these and for more support, please get in touch with our Customer Services Team on cs@dunsterhouse.co.uk.


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† Reference to Price on 22nd December 2023
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