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The DIY Insulated Garden Room
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The DIY Insulated Garden Room

£7,479.99
In stock
Delivery from 24/11/2025 Delivery from 24/11/2025

Download the tech spec here

Customise Your Garden Building

Ready-Painted solutions
TimberArmour Pressure Treatment
Base
Treatment
Roof and Floor upgrades
Optional extras
Premium paint
Protek Royal Exterior 5L - Golden Oak Protek Royal Exterior 5L - Sage Leaf Protek Royal Exterior 5L - Silver Grey Protek Royal Exterior 5L - Slate Grey Protek Royal Exterior 5L - Anthracite Grey Protek Royal Exterior 5L - Evergreen Protek Royal Exterior 5L - Heritage Blue Protek Royal Exterior 5L - Nude Taupe Protek Royal Exterior 5L - Rose Pink Protek Royal Exterior 5L - Pale Pistachio
Installation services

Benefits

Easy to Follow Instructions Easy to Follow Instructions
10 Year Anti-rot Guarantee 10 Year Anti-rot Guarantee
Description

Build an additional living space with our Self-Build Insulated Garden Room.

Aspiring to open a home business? Or a place to expand your hobby? A Mercia Insulated Garden Room creates a secure yet serene environment within your garden. The modular design means you can place the doors and windows in a configuration to suit your needs.

With 72mm thick double skinned walls, double glazed windows and fully insulated roof, floor and walls, this is the perfect space for all-year-round use.

The flat roof creates a contemporary silhouette in your garden, whilst promoting excellent rain water run-off, helping keep your building dry for many years to come. The roof is covered with high-grade mineral felt.

Mercia Insulated Garden Rooms are manufactured here in the UK, using sustainably sourced and regulated timber. The building comes with comprehensive instructions and a step-by-step video guide taking you through every part of the build. All fixtures and fittings are included as standard. We recommend a good understanding of DIY for the construction of this building.

Please Note: A firm and level base is required for this building, either made of solid concrete or concrete slabs. It is recommended that the floor of this garden room is further covered by either carpet or laminate to reduce wear on the matchboards.

Please Note: These Insulated Garden Rooms are NOT pre-treated or painted. In order to qualify for our 10 year anti-rot guarantee the building must be annually treated with a high quality spirit based wood preservative and a waterproof treatment.

Please Note: A firm and level base is required for this building, either made of solid concrete or concrete slabs. It is recommended that the floor of this garden room is further covered by either carpet or laminate to reduce wear on the matchboards.

Please Note: These Insulated Garden Rooms are NOT pre-treated or painted. In order to qualify for our 10 year anti-rot guarantee the building must be annually treated with a high quality spirit based wood preservative and a waterproof treatment.

Specification

Technical Specifications

People Required To Build
2
Anti-Rot Guarantee
10
Treatment Type
Untreated
Roof Material
EPDM
Glazing Type
14MM DOUBLE GLAZING

Dimensions

Width
4170.0 mm
13.68 ft
164.17 in
Internal Width
3999.0 mm
13.12 ft
157.44 in
Depth
2351.0 mm
7.71 ft
92.56 in
Internal Depth
1999.0 mm
6.56 ft
78.7 in
Base Width
4140.0 mm
13.58 ft
162.99 in
Base Depth
2140.0 mm
7.02 ft
84.25 in
Eave Height
2201.0 mm
7.22 ft
86.65 in
Ridge Height
2314.0 mm
7.59 ft
91.1 in
Door Aperture Height
1850.0 mm
6.07 ft
72.83 in
Door Aperture Width
1512.0 mm
4.96 ft
59.53 in
Delivery

Pick-a-day Delivery

We know life can be hectic and days off are precious, that’s why we offer Pick-a-Day delivery, so you can choose a time for delivery that suits your busy schedule. When you enter your address at the checkout, you will be able to see all the dates that are available to your postcode. Once your order has been placed and our delivery drivers have made it onto the road, you’ll receive a text message with a 2-hour time slot for delivery, so there’s no waiting around.

You can book your preferred delivery date by either:

1. By choosing it when placing your order with us.

2. Through the link provided within your order confirmation email or text message

If a delivery date is not selected, one of our friendly team will be in touch. They will help arrange a suitable delivery date that fits your schedule.

Your garden building will be delivered using either a 3.5t, 7.5t or 18t flatbed vehicle. If you believe there may be difficulties accessing your property or the delivery location, please inform us of this prior to your delivery date.

All our deliveries take place between the hours of 7 am and 7 pm and are carried out by one of our helpful drivers.

On the morning of your confirmed delivery date, we will contact you by email or text message assigning you a two-hour delivery slot. This means that there is no need to wait in all day! We aim to meet these delivery times wherever possible. However, please be aware that unforeseen circumstances can cause deliveries to take a little longer. But rest assured, we are always working hard to keep delays of this sort to a minimum.

Also, on your confirmed delivery date, we will send over a link to the Delivery Portal. Here you will be able to track the exact location of your delivery driver.

Please note that all our deliveries are kerbside only. Our drivers are not permitted to enter your property. If you live in a terraced property, please be mindful to this.

Our delivery driver will unload your new garden building piece by piece to prevent any damage. Yourself, a friend or neighbour will need to be present during the delivery process. This is to ensure that you are happy with the building and are available to sign for the item where required.

In certain situations, we may be able to leave your new garden building in an assigned safe location. If this is a service that you require, please contact our team on 01636 821215, prior to your confirmed delivery date.

Returns

We offer a 14 day money back guarantee on all of our items. The guarantee commences from the date which you receive your item and we offer a free collection service as part of this agreement.

The building must be returned in its original, untreated, resalable condition. Until the item is collected by our courier, it's the responsibility of the customer to ensure that the building remains in this condition.

As the buildings are sold as DIY kits, we cannot dismantle on your behalf and we cannot be held liable for any third party costs. Once the building has been received by our factory, a full refund will be issued within 1-3 working days.

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