Mercia Products Authorized Dealer
5M X 3M(D) Insulated Garden Room
5M X 3M(D) Insulated Garden Room
- Free Installation Service.
- Free Insured Shipping.
- 10 Year Anti-rot Guarantee.
- Manufactured in the UK.
- Reasonable Price
- 7-10 Days Delivery
Low stock: Only 5 left
Couldn't load pickup availability
What makes the 5M X 3M Insulated Garden Room perfect for year-round use?
The 5M X 3M Insulated Garden Room is equipped with Eco-quilt insulation in the walls, roof, and floor, making it ideal for year-round use. The self build garden rooms trap heat and reduce noise, creating a comfortable space for your DIY garden office or self assembly garden rooms.
Do I need planning permission for the Insulated Garden Room?
No, the 5M X 3M Insulated Garden Room is under 2.5m in height, so it typically does not require planning permission. However, we recommend confirming with your local authority. This makes it a perfect choice for a hassle-free garden room self build.
How does the installation process work for the self build garden rooms?
Our fully fitted service ensures that your garden room is installed with ease. Our expert fitters will handle the construction of your insulated garden room kits, leaving you free to enjoy your new space without the stress of assembly.
Is the 5M X 3M Insulated Garden Room suitable for a DIY garden office?
Yes, the 5M X 3M Insulated Garden Room is a perfect solution for creating a DIY garden office. With thick insulation, double-glazed windows, and a comfortable interior, it offers an ideal environment for working from home all year round.
What is included with my self assembly garden rooms purchase?
When you purchase the 5M X 3M Insulated Garden Room, you’ll receive the fully assembled kit, including Eco-quilt insulation, EPDM rubber roofing, and double-glazed windows. Additionally, you get free delivery and installation, making it an easy and hassle-free experience.
How long does delivery take for the Insulated Garden Room kits?
Delivery for the 5M X 3M Insulated Garden Room takes 7 - 10 working days, and we offer free delivery to most UK postcodes. You can even choose a convenient delivery day to fit your schedule.
Can I customize the design of my self build garden room?
While the 5M X 3M Insulated Garden Room comes in a standard design, we offer a range of customizable options to tailor it to your needs. This allows you to create your ideal self assembly garden room or garden room self build.







This 5m x 3m Insulated Garden Room is an incredibly versatile building that can be used all year round thanks to the Eco-quilt insulation that features in the walls, roof and floor. The walls are consist of three layers, a 16mm tongue and groove outer layer, a 44mm gap in the middle that is filled with insulation, and a 12mm tongue and groove inner wall. The thick walls mean heat is trapped in and any entering noise from the outside is greatly reduced.
Each window used in this building is double glazed as standard and filled with argon, helping to retain the warmth all year round. The roof and floor are built using 16mm tongue and groove cladding and also utilise the same Eco-quilt insulation within their construction. We use an EPDM rubber to cover the roof of this building, EPDM is a membrane designed by Firestone that offers incredibly resilient and long lasting protection against the British weather.
Mercia Insulated Garden Rooms are manufactured here in the UK, using sustainably sourced and regulated timber. An added bonus with this Insulated Garden Room is that it does not require planning permission from the local authorities because it is under 2.5m in height. We do advise you check with your local authority to confirm this. All of our insulated garden rooms are fully installed for you as part of the price you pay, meaning all you have to do is sit back and relax whilst our installers erect your new building.
Specifications
- Imperial Size: 16 x 10
- Treatment Type: Untreated
- People Req'd To Build: Fully Fitted
- Guarantee: 10 Year Guarantee
- Cladding: Shiplap+
- Cladd Material: 16mm Shiplap+ Tongue & Groove
- Roof Material: OSB & 12mm Matchboard
- Floor Material: 12mm Matchboard
- Roof Type: Flat Roof
- Door Style: Double Door
- Building Type: Garden Room
- Metric Size: 5m x 3m
- Under 25: Yes
Dimensions
- Width: 16' 11" / 5.17m
- Depth: 12' 7" / 3.84m
- Door Width: 4' 11" / 1.5m
- Door Height: 6' 1" / 1.85m
- Internal Width: 16' 4" / 5.0m
- Internal Depth: 9' 10" / 3.0m
- Floor Width: 16' 10" / 5.13m
- Floor Depth: 10' 3" / 3.12m
Installation Service

Sit back and let us do the hard work! Our installation service is designed to not only save you valuable time but also take the work of moving and constructing the building off your shoulders. Our fully trained, expert fitters work professionally and carefully to ensure that your new garden building is constructed safely and to the highest industry standards.
And don't worry, we make sure to clean up afterwards, taking away excess packaging and leaving you to enjoy your new building.
Learn more at: https://www.gardenarch.co.uk/pages/installation-service
Home Delivery

We offer a fast, free and reliable home delivery service with every order to most UK postcodes. With the ability to pick-a-day that suits you and your schedule, there's no need wait around for days on end.
Our friendly and punctual delivery drivers will deliver your building within 7 - 10 working days of purchase at the front of your property. All of our products are delivered flat packed, to ensure it is easy for you to move the product from the delivery location to the build site.
On the day of delivery you'll be given a two hour delivery slot and our driver will keep in contact with you, so you can make the most of your day.
Learn more at: https://www.gardenarch.co.uk/pages/delivery
GardenArch vs Other Brands
-
GardenArch
- Reasonable Prices + No Fees
- Free Shipping.
- Free Installation Service.
- Made in UK.
- 100% High Quality Materials.
- 10 Year Anti-rot Guarantee.
-
Others
- Expensive Prices + Fees
- Paid Shipping (£100+).
- Paid Installation Service (£500+).
- Imported from China.
- 100% Low Quality Materials.
- 1-5 Year Anti-rot Guarantee.
The Installation Service Process





Why Choose Us?
-
Free Pick A Day Delivery
-
Free Installation Service
-
100% Made in UK
-
10 year Anti-Rot Guarantee
-
100% Satisfaction Guaranteed