30th Anniversary Offers on Garden Buildings

Addroom® Porch Groove Effect – Left

Approx. W1.8m x D1.2m / W6' x D4'

(Sizes shown are approximate & full sizes are shown in the product specification)

From £1,434.99 £2,074.99
Save £640
Free delivery *
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  • Low maintenance and durable exterior walls
  • Easy build DIY panel system for quicker install
  • Pressure treated, NOT dip treated
  • Customisable design

Addroom® Porch Groove Effect – Left Overview

Add a stylish and secure entrance to your home with the Addroom® 1.8m x 1.2m Porch. Built from WPC (wood-polymer composite) providing a wipe-clean, low maintenance exterior surface. The front porch has been designed with simplicity, ease and security in mind.


No matter the weather, the area will stay warm in the winter and cool in the summer as it has Polyisocyanurate insulation between the walls, roof and floor. The windows are 28mm double glazed, supporting insulation as well as security. Enter the porch through the uPVC door which comes with a 10-point locking system.

Key Features

  • Walkthrough height of 1.84m for a fully usable room
  • Insulated 140mm solid walls, 65mm roofing, 40mm floor
  • 10 Year guarantee on pressure treated floor bearers
  • Secure, Industry leading 10-point locking system
  • 28mm toughened double glazed uPVC windows and doors

Install the front porch on the fully pressure treated floor bearers (guaranteed for 10 years) which are provided as standard. Gain some additional space as well as a stylish feature with the Addroom® Grooved Porch.

Additional Information

Established in 1994, we are Industry experts that YOU CAN TRUST!

We are a UK family-run business supporting more than 700 jobs up and down the UK with dedicated distribution centres strategically placed across the country so that we can deliver products to you quickly.

We have been selling garden buildings and structures for decades, so you can realise your dreams and create the perfect outdoor space, whether it is for relaxation, a place of work or a destination to fulfil your hobbies or to simply entertain…

…our vast range of products means that you are bound to find the ideal solution for YOU.


Why have so many chosen to buy from Dunster House?


Trusted by Tens of Thousands of Customers

Our customers are at the forefront of every decision that we make, that is why we have been able to sell millions of products to satisfied customers up and down the county. Why not check out our Trustpilot reviews? They speak for themselves!


Buy Direct from The Manufacture!

Buy directly from Dunster House, and you will benefit from great value prices. Who wants to pay more than you have to? Well, at Dunster House you can cut out the middleman – We design, We make, We deliver!


Exceptional Value, Superb Quality

We are known for providing exceptionally high-quality products at affordable prices. Be wary of competitors who offer lower-spec products, cut corners to save on prices and try to upsell you on necessary items such as flooring, roofing material and safety features!

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 a much more consistent colour than the likes of Pine.


Products Designed for the DIY Market

All of our garden buildings are designed with the DIY market in mind. Why? Because it saves the need to employ a carpenter or builder helping you to save money and costs. Follow our detailed instructions and you will be showing off your achievements to friends and family in no time.


Speak with Experts and Buy with Confidence

Our in-house sales team are available during business hours to answer any questions you might have before making a purchase. With expert product knowledge, have your questions answered so that you can buy with confidence.  Contact us today


A Wide Range of Products to Choose From

Explore our extensive range of products online or download one of our free brochures for more detailed information. Our user-friendly website allows you to easily search and filter through our garden buildings to find exactly what you need. Each product page provides comprehensive descriptions, high-quality images, and customer reviews to help you make informed decisions.

If you prefer a more traditional approach, our free brochures are available for download. These brochures provide in-depth insights and product specifications to help you get the most out of our products. Whether you’re browsing on-the-go or reviewing options at your leisure, our brochures are designed to be a convenient and informative resource.

The majority of our garden buildings, structures and climbing frames are made from natural materials therefore variations in the materials provided can occur along with natural changes and differences. In some cases too, it may be necessary to treat your product. Be an informed buyer and learn more.


Looking for some Inspiration?


Explore our customer inspiration gallery, a treasure trove of creativity and innovation, showcasing a myriad of garden ideas brought to life by our valued customers. Immerse yourself in a visual journey where elegant outdoor living spaces come together to inspire your own garden projects.

Dive deeper into our customer case studies, where compelling customer stories unfold alongside captivating images. These real-life examples illustrate how our products have been used to achieve stunning results, offering practical inspiration and guidance for your own endeavours.

Whether you’re envisioning a serene sanctuary, a productive work space, or a stylish entertainment area, our customer inspiration gallery and Case Studies provide a wealth of ideas and solutions to help you realise your garden dreams. Let these stories and images ignite your imagination and empower you to create a garden space that reflects your unique style and aspirations.

This porch is under 3m high. Why does this matter? Under UK permitted development rights, porches under 3m can be constructed without planning permission*. In addition, this porch doesn’t exceed 3 square meters.  If you want to find out more about permitted development, visit the planning portal.

*Please be advised that some exclusions may apply depending on property age, where it is situated etc. If in doubt, please check with your local planning authority.

groove wall effect on porches

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.

fire resistant inner wall for garden rooms

Our porches are easy to heat, and maintain a warm temperature in the winter while staying cool in the summer. Our porches feature polyisocyanurate insulation in the walls, roof and floor, creating a warm and inviting entrance. Polyisocyanurate is known for being a far superior insulative material than the alternatives of polystyrene, Rockwool or bubble wrap.

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.

Spanish roof   Spanish roof and brick effect

Our porches are designed with a high internal eaves height reaching 2.11m.  There’s plenty of room inside for people to walk around without bumping their heads and plenty of space making for a fully usable porch.

high internal eaves for porches

There’s no need for you or your guests to ‘duck’ on the way in through the door of the porch. With a tall walkthrough height of 6’0″ (1.84m) you’re free to move in and out of the porch with ease.

addroom porch tall walkthrough height

Possessing all the benefits of plastic and timber combined,  Composite is ideal for use on outdoor buildings. It is hard-wearing, resistant to water and requires very little maintenance. The impressive brick effect design on the exterior walls enable you to match your garden room to your house. The traditional red coloured, natural toned brick will give an attractive finish to your garden room that will blend beautifully with your home. Meanwhile, the light grey/beige coloured brick effect will give your garden room a more contemporary feel for a modern look.


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

wpc brick options

Get your porch installed quickly and easily thanks to the full panels provided. There is no need to waste time building up walls or fixing doors together.

addroom porch easy to build panel system

The security of your front porch is a key priority of ours, especially as this is a space that you will store belongings and will be in clear sight of others. Therefore, we have included our industry-leading 10-point locking system on the single PVCu door, as well as multipoint locking windows which feature secure key locking handles.


Our 10-point locking consists of four shoot bolts, three mushroom-headed espagnolettes, three hook bolts, a locking latch and a 6-pin euro cylinder. All our windows feature a multi-point locking system consisting of espagnolettes which move in opposite directions into metal keeps. Why would you risk your possessions by using less?

Addroom porch multipoint locking    Addroom porch multipoint locking

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 Use Class 3

Pressure Treated Bearers

Rotten Untreated Floor Bearers

Add a flyscreen to the windows of your garden building, so you can benefit from letting the fresh air in while keeping those pesky insects out, without restricting visibility. An insect screen will allow you to still view out of the window to survey your surroundings, watch nature and look out at the beauty of your garden.

flyroom screens for porches

As the effects of global warming take place, the Earth is changing, with reports suggesting an expected increase in the number of insects around the world. An increase in temperatures over the coming years will speed up the growth rate of some insects. This includes the domestic housefly, which could see a rapid rise in its population. Order your flyscreens now to protect you for the future.

Keeps out insects

It’s always nice to be able to throw open the windows of your garden room to enjoy a warm summer breeze or cooling air. With the addition of a flyscreen mesh, you can enjoy the warm weather without worrying about unwanted insects getting in. Keep those flying insects from buzzing around as you try to work in your garden office or relax in your summer house.

Ventilation and comfort

Ventilation and circulation of fresh air is also important for the wellbeing of you and your garden building and helps to maintain a relaxed and comfortable environment inside. Flyscreens for windows give effective protection so you don’t have the annoyance of flies and other creepy crawlies.

Durable materials

The fly mesh is made of strong and water-resistant materials to last. Easy to fit

It is provided as a simple ready to install screen to fit the size of your garden room or log cabin window and fixes to the window frame. Easy to follow instructions will be provided alongside your order.

Easy to use

The roller flyscreen is easy to operate, with a handle to pull it down when the window is open, and a small clip will keep the screen in place. When not in use, the retractable flyscreen design allows it to be discreetly hidden away.

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!

28mm Double glazing on Garden Offices

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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.


It is high

No, we do not have any showrooms or display sites. All business is completed online and via our website. If you do have any queries that haven’t been answered with the information provided online, please feel free to call our sales team on 01234 272445.

An Addroom® porch is a fast, cost-effective & convenient solution to home expansion. Addrooms® porches can elevate your homes entrance by adding a stylish focal point of your property. Made from WPC (wood-polymer composite) and designed with a Grooved exterior and WPC slate-effect roof.

Keep the front porch warm in the winter and cool in the summer as this structure is fully insulated, using Polyisocyanurate insulation sandwiched between the panels. To further improve insulation, all windows are 28mm double glazed. The PVCu door is supplied with a 10-point locking system, ensuring all belongings stored in the porch are safe and secure.

Often, an additional cost is buried within the price when offering finance, thus making your purchase higher priced. This is the reason we do not offer finance and feel that it would not be beneficial for our customers or us. However, we have come up with an alternative method for you where you can use a 0% interest-free credit card to pay off your purchase. For more information, see this article: Do we offer finance?

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.

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].

We offer a genuine 10-year guarantee against rot and insect infestation on pressure treated timber, which covers the floor bearers of your product.

We recommend a flat, level base at least 100mm bigger on each side. e.g. A W4.0m by D3.0m garden building would have a base of 4.2m by 3.2m See more details here.

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  • Please Note: All sizes quoted are nominal
  • Overall External Dimensions: 1.84m x 1.23m (6' 0" x 4' 0")
  • External Width: 1.72m (5' 7")
  • External Depth: 1.10m (3' 7")
  • Internal Width: 1.44m (4' 8")
  • Internal Depth: 1.02m (3' 4")
  • Internal Area (m2): 1.48
  • Ridge Height: 2.51m (8' 2")
  • Internal Eaves (Front): 2.11m (6' 11")
  • Internal Eaves (Rear): 2.37m (7' 9")
  • Wall Thickness: 140mm Insulated Panel, Consisting of: 10mm WPC (Wood Polymer Composite - Groove Effect), 50mm Insulation, 70mm Frame and 10mm Fermacell Inner Wall
  • Frame Thickness: 70mm
  • Floor Bearers: Pressure Treated
  • Roof Thickness: 41mm Insulated Panel Consisting of: 10mm WPC (Wood Polymer Composite - Slate Effect), 25mm Frame with Insulation and 6mm MDF Inner Ceiling
  • Floor Thickness: 40mm Insulated Panel consisting of: 5mm WPC (Wood Polymer Composite), 25mm Wood Frame with Insulation and 10mm MR P5
  • Roof Purlin Thickness: 70mm
  • Internal Finish: Unpainted Fermacell Board
  • Door Material: Reinforced 5 Chamber PVCu Profile
  • Door Locking System: Multi point locking system with 6 pin euro cylinder lock barrel
  • Door Opening Size: 0.76m x 1.84m (2' 5" x 6' 0")
  • Windows Opening Size: 0.42m x 0.61m (1' 4" x 2' 0")
  • Window Locking System: Multi-Point Locking
  • Gaskets: On all Windows and Doors
  • Glazing Material: 28mm Double Glazed
  • uPVC Colour options: White
  • Please Note: Flashing not included
  • Approx. DIY Assembly Time: 1 - 2 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

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Delivery Information

* Free delivery on orders over £200.

We deliver our products to the 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
  • LD
  • PL10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35
  • SA
  • 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

Dunster House delivery map

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.

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?

Buy with confidence! Established for over 30 years, you can rest assured of our knowledge and experience as industry leaders.

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!

All products are uniquely designed and of high quality with many industry leading features you will struggle to find anywhere else!

A UK company and family run business. Our products are designed  and distributed from our 11 UK distribution centres.

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 delivery on most products*. Delivered to you by our own fleet of vehicles and dedicated drivers.

Inspiration/Customer Stories

Dean’s Garden Cinema Room

View Case Study

Ed’s Garden Music Room and Home Office

View Case Study

Andy and Rose’s Garden Games Room

View Case Study

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* Free delivery on orders over £200.
† Reference to Price on 22nd December, 2023

Addroom® Porch Groove Effect – Left

From £1,434.99 £2,074.99
Save £640