Mercia Products Authorized Dealer
Sherwood Thoresby 5M X 3M Insulated Garden Room - (Upvc Windows & Doors) - White
Sherwood Thoresby 5M X 3M Insulated Garden Room - (Upvc Windows & Doors) - White
- 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 Sherwood Thoresby an ideal insulated garden room?
The Sherwood Thoresby features Eco-quilt multi-foil insulation in the walls, roof, and floor, providing the same insulation as 100mm of glass wool. Combined with double-glazed windows and French doors, it ensures a warm, comfortable space all year round, making it perfect for use as an insulated garden office room or additional living space.
Can I use the Sherwood Thoresby as a garden office?
Absolutely! The Sherwood Thoresby is a versatile insulated garden room, ideal for a garden office, home gym, or guest accommodation. Its premium insulation and modern design make it a perfect space for working from home in comfort throughout the year.
How long will the Sherwood Thoresby last?
The Sherwood Thoresby is built to last with a superior waterproof rubber membrane roof designed to endure for 50 years. The high-quality materials and 10-year guarantee provide added confidence in the durability of this insulated garden room.
Is the Sherwood Thoresby suitable for year-round use in the UK climate?
Yes, this insulated garden room is designed for year-round comfort in the UK. The combination of multi-foil insulation, double-glazed windows, and French doors ensures that it remains warm and welcoming, regardless of the season.
Do I need to assemble the Sherwood Thoresby myself?
No, the Sherwood Thoresby comes with a fully fitted installation service. Our expert fitters will take care of the construction, ensuring it's built to the highest standards so you can enjoy your new insulated garden room without the hassle.
Can I customize the Sherwood Thoresby garden room?
Yes, the Sherwood Thoresby is highly customizable. You can adjust the number of windows, move the door location, and more. Just contact us to discuss your specific requirements for your perfect insulated garden office room.
How long does delivery take for the Sherwood Thoresby garden room?
We offer fast, free delivery to most UK postcodes within 7-10 working days. You can also choose a delivery day that suits your schedule, ensuring your new insulated garden room arrives when you’re ready.







The Thoresby has a traditional feel, ideal for those looking to create a statement within the garden! Whether you’re looking for a home office, garden gym or guest accommodation, you can maximise your living space at home with our all-purpose garden room.
So much more than a summerhouse, this building is packed with premium features as standard. The walls, roof and floor contains Eco-quilt multi-foil insulation, which provides the same insulation as 100mm of glass wool. This combined with the double glazed windows and French doors ensures a warm, welcoming and comfortable interior all year round. The 100mm double skinned walls have also been designed with an easily removable internal panel to enable you to fit and conceal any electrics you may require – perfect for tidying away all your office cables. Finally the roof is covered with a superior waterproof rubber membrane, designed to last for 50 years!
The Thoresby exterior is a contemporary take on a traditional apex design and features a welcoming sheltered veranda to the front. The interior is open and airy and boasts a high ceiling, creating the perfect frame for a feature light! Manufactured to order here in the UK by our highly skilled team, using only the highest grade materials, you can be confident in the quality.
Available in mutplite variants, this garden room is versatile and customisable. Looking for more windows? Not a problem. Wanting to move the door location? We can do that. Just give us a call and we can discuss the options with you! Mercia Insulated Garden Rooms are manufactured here in the UK, using sustainably sourced and regulated timber.
Available variants:
-4m x 3m
-5m x 3m
Specifications
- Treatment Type: Untreated
- People Req'd To Build: Fully Fitted
- Guarantee: 10 Year Guarantee
- Cladding: Shiplap+ Cladding
- Cladd Thick: 72mm Thick Double Skinned Walls
- Roof Material: OSB & 12mm Tongue and Groove
- Floor Material: 16mm Tongue & Groove
- Door Style: Double Doors
Dimensions
- Width: 20' 2" / 6.17m
- Depth: 15' 10" / 4.85m
- Eaves Height: 7' 2" / 2.19m
- Ridge Height: 8' 0" / 2.44m
- Door Width: 4' 11" / 1.51m
- Door Height: 6' 0" / 1.85m
- Internal Width: 19' 8" / 6.0m
- Internal Depth: 13' 1" / 4.0m
- Floor Width: 20' 1" / 6.14m
- Floor Depth: 13' 6" / 4.14m
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