Facebook Pixel
Contact Us
Email Us
Brochures
Customer Login
Your Basket
Saved Products
Dunster House Ltd.
Established 1994
Search results
Lines re-open tomorrow at 10:00AM
free delivery icon
FREE DELIVERY
ON MOST ORDERS
uk company icon
UK COMPANY
responsibly sourced timber
RESPONSIBLY SOURCED TIMBER
millions of products
MILLIONS OF PRODUCTS SOLD
1:
Choose Your Option
APPROX 5 - 6 WEEKS
£7,394.99 †
£6,404.99 
SAVE £990
Includes:
Insulated Walls + Insulated Floor + Insulated Roof + White uPVC Windows & Doors
Info Insulation Options
 
£0.00 
2:
Optional Extras
3:
Delivery choices*
Apply
Free Delivery Info
TOTAL: 
£6,404.99  
inc. VAT
ajax loader
Add to basket

Industry Leading Window and Door Locking

+
 
Industry leading windows and door locking system for garden rooms
garden room multipoint locking window
 
Domestic Locking System

Whatever you choose to use your garden room for, security is important to keep all your treasured belongings and valuable items safe. This is why we include PVCu French doors with an industry-leading 12-point locking system, as well as multi-point locking windows with key locking handles.

 

Our 12-point locking system consists of four shoot bolts, three espagnolettes, three hook bolts, a locking latch and a 6-pin euro cylinder. Our window locking system consists of mushroom-headed espagnolettes which move in opposite directions into metal keeps.

Easy To Build Panel System

+
 
Addroom Garden Room Easy to build panel system
 
 Easy To Build Panel System
The garden room is supplied in ready-made sandwich panels for easy assembly. The simple construction system makes it a much cheaper, easier and quicker alternative to brick extensions and conservatories. You can get your new garden room up and running in no time, so you can spend more time enjoying it and less time building it.

Pressure Treated Bearers

+
 
Pressure Treated Bearers for garden rooms
 
Pressure Treated Bearers

Addroom Garden Room comes with pressure treated floor bearers included as part of the standard kit. This is highly important in helping to maintain a solid foundation for your building, as this is the part in contact with the cold damp ground. Beware of companies that leave the timber untreated, or don’t even supply floor bearers at all for the building to sit on.

 

Pressure treatment is a costly and time consuming process, but is highly effective in protecting the timber. During the process, wood preservative is forced deep into the timber as moisture is removed. This fully protects the wood, making it much more effective than dip treatment which only coats the exterior surface. All of our pressure treated timber comes with a genuine 10 year guarantee against rot and insect infestation. However, we do recommend you apply a good quality water repellent to the timber to help prolong its life.

 

All our Pressure Treated timber is for User Class 3

Tall Walkthrough Height

+
 
4 x 3 groove addroom tall walkthrough height
 
Tall Walkthrough Height

The tall walkthrough height of 6'0" (1.84m) means you should be able to walk in and out of the doors of your garden room without running the risk of bumping your head.

 

When comparing the door heights with others be careful of companies that also include the door frame in their measurements to make is sound larger than it really is.

Wide Opening French Doors

+
 
Wide Opening French Doors for garden rooms
 
Wide Opening French Doors
The wide opening PVCu French doors offer a large walkthrough width, providing easy access for moving items in and out of your garden room. They also allow you to make the most of the fresh outdoor air and natural sunlight.

Fully Insulated with Polyisocyanurate Sandwich Pan

+
 
groove addroom fully insulated
 
Fully Insulated Sandwich Panels

Insulation is important in helping to maintain the temperature inside your garden room, so you can maximise its use all throughout the year. It will help to retain any generated heat inside to keep you warm during the colder months. It will also help to keep the building cool inside during hot summer days. This means you will have a comfortable living space no matter what time of year it is.  

 

All Addroom Garden Rooms come fully insulated with polyisocyanurate sandwich panels making up the walls and floor of the building. The roof also comes as an insulated sandwich panel with a high density polyurethane core. The walls have a 70mm cavity to increase airflow and ventilation, with two skins of 25mm thick insulation, while the floor is made with 25mm thick insulation. We use polyisocyanurate insulation as it gives high thermal efficiency, and is known to be far superior to alternative materials used by other companies, such as polystyrene, rockwool or bubble wrap.

High Internal Eaves Height

+
 
High Internal Eaves for Addrooms
 
High Internal Eaves Height
The high internal eaves of our garden rooms provide you with a spacious and comfortable interior, where you can stand tall and proud. At 2.41m (7’ 11”) high, you can relax, work, socialise or walk around with ease.

Spanish Style Insulated Roof Panels

+
 
Spanish Style Insulated Roof Panels cross section
Spanish Style Insulated Roof Panels Groove Effect garden rooms
 
Traditional Style Insulated Roof Panels

Our Addroom Garden Rooms come with an easy-to-install insulated roof panel that has an attractive grey slate tile effect appearance. This offers the best performance and aesthetic finish, imitating a traditional design that gives your building a modern look.

 

The 65mm thick insulated sandwich panel provides high levels of thermal efficiency and good sound insulation. It has a polyurethane insulation foam core protected by two sheets of pre-lacquered, galvanised and profiled steel. The upper tiled effect layer is formed by a total of six tiles, not five like others do, as it offers more resistance and insulation capacity. Polyurethane is a high density material with fantastic insulative properties. The lower steel plate is finished in basic white.

 

The overlapping joining system gives the roof tight connections that help prevent leaks and humidity, ensuring warmth is kept in and doesn’t escape through the ceiling. The high quality roofing system has been subjected to numerous tests and controls to ensure the effective performance of its qualities and characteristics.

Addroom® Garden Room - Porch Groove Effect

+
 
 
 
Stylish Groove Effect Exterior

You may have heard of the composite wood-plastic material that is becoming increasingly popular for use in gardens and outdoor construction such as decking and sheds. WPC has all the benefits of plastic and timber combined, meaning zero maintenance and impressive water resistance. Supplied with an eye-catching grooved finish, these front porches are complete with the perfect combination of garden-use materials. It can be painted to your preference using a Multi Surface Paint, similar to 'BEDEC Multi Surface Paint'. We have used 'BEDEC Multi Surface Paint' for over eight years now and found it has fantastic adhesion, wear and colour fastness.

 

Please note that unpainted/untreated areas of WPC may differ slightly in colour due to manufacturing processes.

28mm Double Glazing

+
 
28mm Double Glazing for Addroom Garden Rooms
 
28mm Double Glazing
Our Addroom Garden Rooms have 28mm double glazing in all of the windows and doors. These double glazed sealed units are made using 4mm panes of glass with a 20mm aluminium spacer bar in between to absorb any moisture. This is designed to prevent condensation within the unit, and has been independently tested to ensure this. These sealed units also comply to BS EN 1279 standards, which covers requirements for thermal and sound insulation.

Fire Resistant Inner Wall

+
 
Fire Resistant Inner Wall for garden rooms
 
Fire Resistant Inner Wall
The inner walls of our garden rooms are made using a fire resistant fibreboard for increased protection. This is a hard-wearing material made from recycled paper fibres and Gypsum (Hydrous Calcium Sulphate). The fibreboard is supplied unpainted so you can design and decorate the interior of your garden room to your own individual style. This material is a good surface for paint and is easy to wallpaper.

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 An Addroom®?

+
An Addroom® is a fast, cost-effective & convenient solution to home expansion. An Addroom® can have numerous uses, such as a garden office, an extra family room, a games room, a music room, a gym... the list is endless. An Addroom® can be the perfect cost-effective alternative to a conservatory. So why buy an Addroom®? • Simple panel system designed with the DIY market in mind • Why move home? Avoid expensive moving costs! • A useable room all year round, unlike some conservatories • No dirty glass roofing to clean • An ideal office, playroom, gym and more • No bricks and mortar, less time, less money

How Big Is This Addroom®?

+
This Addroom’s measurements are: 4.01m (13' 1") x 3.01m (9' 10")

How High Is This Addroom®?

+
It is 2.99m (9' 9") high

Do I need Foundations?

+
No! Addrooms® can be placed on sufficiently consolidated sub-base for the bearers to be placed on such as patio tiles. There’s no need to excavate large footings which can be expensive.

How Much Does An Addroom® Cost?

+
Our competitively-priced Addroom® costs a mere 6404.99 and is likely to cost far less than a brick-built alternative

Do You Install?

+
Unfortunately, we do not offer installation currently. All our Addroom® / porch has 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. 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. 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.

How Do I Keep My Addroom® Warm?

+
There are several options available when looking at how to keep your Addroom® warm. Firstly, if you are only planning to use your Addroom® occasionally, we would recommend putting in a small electric heater in the Addroom®. Usually, you would turn that on 20 minutes before you are going to use it to kill off the chill. However, if you are planning to use your Addroom® all year round for either business purposes or a play area etc, you may want to consider the option of an isolated heating system. Remember, our Addrooms® are highly insulated for year-round use. See our features tab for more information.

How does this attach to my House?

+
All Houses are different some are brick, some are not. We do not therefore supply the fixings.

How do I make this watertight?

+
We show in the build guide where to place sealant around the frame including where it meets the House. We also recommend a good flashing be used on the roof. The guide shows where this meets the building and the Addroom.

Does An Addroom® Require Planning Permission?

+
A commonly asked question is whether an Addroom® requires planning permission, or does the Addroom® fall under permitted development?

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 some 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.

Where permitted development may apply:
• If the maximum ridge height is less than 3 metres (the Addroom® height is 2.99m (9' 9"))
• If the building is less than 30 square metres internally (the Addroom® area is 10.93 m2)
• If the total external depth from the house wall is less than or equal to 3 metres (the Addroom® is 3.01m (9' 10"))

You may need to consider applying for planning:
• If you intend on putting an outbuilding on the principal elevation of your property
• 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

Learn more about Planning Permission in the UK

Still not sure?
If you require any further information or are in any doubt, please visit the official government website, or contact your local planning authority.

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?

Can I install heating?

+
This Addroom® is well insulated, but a small electric or fan heater is a good idea to keep the building warm inside. If you choose to install electrics, speak to an electrician about heating.

Does This Product Come With Electrics?

+
Fitting electrics to an Addroom® is a popular idea and of course, to make your room usable day and night, you may want to consider installing electrics. The installation of electrics is entirely possible however, we recommend that you speak with an electrician on the best ways to fit electrics to suit Addroom® design and what you intend to use it for. Please note that we are unable to offer guidance on how to install/make recommendations on modifications of our product beyond what we supply as standard.

What do I do about an external water tap or gas flue?

+
We are not plumbers or gas engineers therefore we cannot tell you exactly what to do however, in most cases as with any build, a solution can normally be found. We recommend that you contact a plumber who can best advise you on a solution.

Can I decorate the internal walls of the Addroom®?

+
The inner walls of our Addrooms® are made using a fire-resistant fibreboard for increased protection. This is a hard-wearing material made from recycled paper fibres and Gypsum (Hydrous Calcium Sulphate). The fibreboard is supplied unpainted so you can design and decorate the interior of your Addrooms® to your own individual style. This material is a ideal surface for paint.

My house has airbricks where I want to install my Addroom® , what do I do?

+
Airbricks are an important part of house construction as they allow ventilation of the soil underneath the house, they must not under any circumstances be covered over. They can however in most circumstances be moved or rerouted. Your local builder should be able to directly advise and/or do this job for you, contact them for a quote.

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.

Similar sizes
Addroom® Modular Garden Room
Addroom® Modular Garden Room
W4m x D3m
from £7,139.99
Addroom® Modular Garden Room
Addroom® Modular Garden Room
W4m x D3m
from £6,919.99
Addroom® Garden Room Brick Effect - Right
Addroom® Garden Room Brick Effect - Right
W4m x D3m
from £6,714.99
Addroom® Garden Room Brick Effect - Centre
Addroom® Garden Room Brick Effect - Centre
W4m x D3m
from £6,714.99
Addroom® Garden Room Groove Effect - Right
Addroom® Garden Room Groove Effect - Right
W4m x D3m
from £6,404.99
Addroom® Modular Garden Room
Addroom® Modular Garden Room
W4m x D3m
from £6,599.99
Addroom® Modular Garden Room
Addroom® Modular Garden Room
W4m x D3m
from £6,924.99
Addroom® Modular Garden Room
Addroom® Modular Garden Room
W4m x D3m
from £6,759.99
† Reference to Price on 22nd December 2023
Trusted By Thousands of Customers
With 45,000+ genuine reviews in total and more than most of our comparable competitors, you can trust us to offer the best possible products and customer service.
Trustpilot
Subscribe to our newsletter!
Subscribe to our newsletter!