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Addroom® Garden Room Groove Effect – Left
Approx. W4m x D3m / W13' x D10'
(Sizes shown are approximate & full sizes are shown in the product specification)
1. Change size
- Insulated 140mm walls, 65mm roofing, 40mm floor
- Cost effective conservatory alternative
- Easy build DIY panel system for quicker install
- Walkthrough height of 1.84m for a fully usable room
Found similar for less? Get in touch and we’ll beat it by 10%
Addroom® Garden Room Groove Effect – Left Overview
The Addroom® 4m x 3m Garden Room (Left configuration) is the ideal solution for adding extra space to your home and can be used for many different purposes. Create a home gym, home office, play room, or your very own man cave. With its easy to install panel system, it is clear to see why it is the best option when it comes to extending your space. It is much more cost effective than having a conservatory built.
This garden room features high quality double-glazed uPVC windows and doors with secure multi-point locking systems. The fully insulated walls roof and floor will ensure you have a usable space throughout the seasons.
Key Features
- Secure, industry leading 12-point locking system
- Groove effect walls. Low maintenance & durable
- 10 Year guarantee on pressure treated floor bearers
- 28mm double glazed uPVC windows and doors
While the durable WPC (Wood Polymer Composite) exterior is built to last with little maintenance. The grey slate tile effect roof finishes off the look of your garden room, making it a stunning feature.
Additional Information
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
Splits
Shakes
Warping / Twisting
Expansion and Contraction
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 Terms and Conditions. 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 [email protected].
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.
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 roofing panel boasts a U-value of 0.32 W/m2K. This compares to 2.8-3.0 W/m2K that you might typically see on an old conservatory glass roof where there is air space between the panes of glass.
What’s a U-value?
U-values refer to the rate of thermal transmittance through a material or structure – how good a thermal conductor or insulator it is. U-values are measured by the unit W/m2K. The lower the U-value, the better!
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.
You’ve probably never really considered the importance of door hinges, but we have! Unlike many competitors who only offer 3 hinges on their uPVC doors, we provide 4.
Uniquely compared to our competitors, we also specialise in the manufacturing of our windows and doors with over 30 years of experience. So you can be safe in the knowledge that you are buying direct from the manufacturer without any middle-men!
Why does additional hinges matter? Rather than risk a door falling out of alignment due to too much pressure and wear on 3 hinges, we reduce the risk by including an additional hinge.
This means that you are far less likely to have to make adjustments to your doors over time.
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!
The Addroom 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.
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.
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.
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 uPVC 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.
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 for User Class 3
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.
Our garden rooms are supplied with domestic standard uPVC windows and door frames available in White as standard or Anthracite Grey Wood Effect. So you can either tie in with your home frame colours or customise your office or garden room!
Not all double glazing is the same, and what truly makes our double glazing stand out among the rest is the sealed unit. We supply a 28mm, double glazed sealed unit. These units comprise of 2 panes of 4mm toughened glass on either side of a 20mm aluminium spacer bar, designed to absorb any moisture within the sealed unit, which could lead to condensation inside the glazing. These sealed units comply to BS EN 1279 standards. This EN standard covers the requirements for insulating glass units, including thermal and sound insulation. The sealed units are independently tested to show that they will not suffer from any form of condensation within the unit.
We’ve been manufacturing uPVC windows and doors for over 30 years – so we really know our stuff!
We were the first on the market to provide tall walkthrough height to the UK market. There’s no need to ‘duck’ on the way in through our quality double French doors. With a tall walkthrough height of 6’2″ (1.88m) you’re free to move in and out of your cabin concussion free. There are other companies who have tried to copy us but have had to include the doorframe as part of the walkthrough height!
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The Addroom is a relatively new type of home leisure building, being that it is an alternative to traditional methods of creating additional useful space in your property (e.g. a conservatory), its applicability to building regulations needs some clarification. Conservatories are exempt from building regulations requirements as long as the following apply.
• Floor area is less than 30 square metres
• Any wall, door or window that separates the dwelling from the conservatory (thermal separation) must not be removed
• Heating is not to be extended into the conservatory
• Compliant glazing e.g. toughened glass
• It is also required to be more than 1 metre from any boundary
These exemptions are important to as to not compromise the energy efficiency of the existing building. As the Addroom is an alternative to a traditional conservatory, but intended to be used in the same manner, it should be exempt under the same criteria. It should be noted that as the Addroom is vastly more insulated than a traditional conservatory, it will actually improve the thermal efficiency of the existing building, as well as reducing heat gain in the summer and heat loss in the winter.
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.
One of the many benefits of the Addroom® is the fact that you can paint the exterior in any colour that you choose. We do not provide the paint as painting the Addroom® is optional*, but should you wish to do so, we recommend an external hard-wearing paint. Please note, we do however recommend that you stick to light colours. Dark colours such as black have the potential to adversely impact the WPC exterior walls under extreme heat conditions.
Find a colour that blends perfectly with your property and its surroundings.
*Please note that unpainted/untreated areas of WPC may differ slightly in colour due to manufacturing processes. Because of this, paint may be required to address variations in panel colours but this is subject to personal preference.
As every property is different, we are unable to offer specific advice on drainage however since the Addroom® does not require extensive groundworks, you are unlikely to disrupt existing drains. You may still require access to your drainage system, however. Please consult a local builder should you have any concerns about drainage. Here is an article which may also be of help to you checkatrade article
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.
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.
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.
All Houses are different some are brick, some are not. We do not therefore supply the fixings, however in the ‘how to build guide’ we show where the fixing screws are to be placed and drilled into your House. This includes the walls the base and the roof.
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.
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.
No! Addrooms® can be placed on a 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.
We show in the instructions manual 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 manual shows where this meets the building and the Addroom® .
An Addroom® is a fast, cost-effective & convenient solution to home expansion. 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. 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
It is 2.99m (9' 9") high
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 2.98m (9′ 9″))
• If the building is less than 30 square metres internally (the Addroom® area is 8.07 m2)
• If the total external depth from the house wall is less than or equal to 3 metres (the Addroom® is 3.02m (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.
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.
This garden room 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.
This Addroom® measurements are: 4.01m (13' 1") x 3.01m (9' 10")
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?
We do not currently offer installation. 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 [email protected].
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A
Internal Eaves (Front)::
2.41m (7' 10")
B
External Depth::
3.01m (9' 10")
C
External Width::
4.01m (13' 1")
D
Ridge Height::
2.99m (9' 9")
- Please Note: All sizes quoted are nominal
- Overall External Dimensions: 4.06m x 3.13m (13' 3" x 10' 3")
- External Width: 4.01m (13' 1")
- External Depth: 3.01m (9' 10")
- Internal Width: 3.73m (12' 2")
- Internal Depth: 2.92m (9' 6")
- Internal Area (m2): 10.93
- Ridge Height: 2.99m (9' 9")
- Internal Eaves (Front): 2.41m (7' 10")
- Wall Thickness: 140mm Insulated Panel, Consisting of: 10mm WPC (Wood Polymer Composite - Groove Effect), 50mm Insulation, 70mm Frame and 10mm Fermacell Inner Wall
- Wall U-Value (W/m2k): 0.39 W/m2K
- Internal Finish: Unpainted Fermacell Board
- Frame Thickness: 70mm
- Roof Thickness: 65mm
- Roof U-Value (W/m2k): 0.32 W/m2K
- Roof Purlin Thickness: 45mm
- Floor Thickness: 40mm Insulated Panel consisting of: 5mm WPC (Wood Polymer Composite), 25mm Wood Frame with Insulation and 10mm MR P5
- Floor U-Value: 0.79 W/m2K
- Floor Bearers: Pressure Treated
- UPVC Colour: White
- Door Material: Reinforced 5 Chamber PVCu Profile
- Door Locking System: 12 Point Locking System
- Door Opening Size: 1.34m x 1.85m (4' 4" x 6' 0")
- Window Opening Size: 0.93m x 0.61m (3' 0" x 2' 0")
- Glazing Material: 28mm Double Glazed
- Window Locking System: Multi-Point Locking
- Gaskets: On all Windows and Doors
- Approx. DIY Assembly Time: 2 - 3 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: Flashing not included
Delivery Information
* Free delivery on orders over £200.
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
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 8:00 am and 6:00 pm.
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.
See the locations we deliver from.
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 /customer-login-area
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.
Why Buy From Us?
Established In 1994
Buy with confidence! Established for over 30 years, you can rest assured of our knowledge and experience as industry leaders.
10 Year Guarantee*
On pressure treated timbers*. We don’t dip-treat our timber unlike some competitors. Dip treatment isn’t as effective at protecting against rot and infestation!
Industry Leading Features
All products are uniquely designed and of high quality with many industry leading features you will struggle to find anywhere else!
Designed in the UK
A UK company and family run business. Our products are designed and distributed from our 11 UK distribution centres.
Millions of DIY Products Sold
Many have bought from us over the last 30+ years due to our superior specification and the fact that our products are designed with the DIY market in mind.
FREE Speedy Delivery*
Free delivery on most products*. Delivered to you by our own fleet of vehicles and dedicated drivers.
Customer Gallery
Customer images are to be used as a guide only and may show different sizes to what is advertised. We do not endorse any modifications that may be shown. See specification for full details.
Inspiration/Customer Stories
Similar Products
* Free delivery on orders over £200.
† Reference to Price on 22nd December, 2023