Fast delivery within 72 Hours
Installed Forest Garden Xtend Insulated Garden Room 13ft 3″ x 10ft (4 x 3m)
£17,499.99
In stock
Transform your property with the Installed Forest Garden Xtend Insulated Garden Room (13ft 3″ x 10ft), a premium, modern garden office or studio engineered with SIP (Structural Insulated Panel) construction for superior year-round thermal efficiency. This robust and spacious outdoor extension features durable timber cladding, double-glazed safety glass, and professional installation, providing a comfortable, secure, and valuable addition to your home.
- Ultimate comfort year-round thanks to high-efficiency SIP construction for walls, roof, and floor.
- Secure and energy-efficient with double-glazed safety glass windows and doors.
- Includes professional installation, ensuring a hassle-free and perfect setup.
- Durable 15mm external interlocking timber cladding and a maintenance-free EPDM rubber roof for weather resistance.
In stock
Shipping & Delivery
-
Courier delivery under £30
Our courier will deliver to the specified address
2-3 Days
From £4.99
-
Prime delivery
Our prime courier will deliver to the specified address
1-2 Days
From £12.99
-
Manufacture Warranty 1 Year
-
Free 30-Day returns





Everyday Blowout — No Holiday Needed.
Product Description
Product Overview
Transform your outdoor space and add significant value to your home with the Installed Forest Garden Xtend Insulated Garden Room 13ft 3″ x 10ft (4 x 3m). This premium, modern garden office/studio is engineered using state-of-the-art Structural Insulated Panel (SIP) construction for exceptional thermal efficiency, making it perfectly comfortable and usable all year round. Whether you need a secluded home office, a creative studio, or an ultimate relaxation space, the Xtend Garden Room is designed for immediate use. It features durable 15mm external interlocking timber cladding, a heavy-duty 1.2mm EPDM rubber roof for superior weather protection, and double-glazed safety glass windows and doors, ensuring high security and energy savings. The interior is finished with 28mm paintable MDF panels, complete with a cavity ready for professional electrical wiring installation (not included). Invest in the ultimate extension of your home without the hassle of traditional construction.
Key Features
- Ultimate Year-Round Comfort with SIP (Structural Insulated Panel) construction for walls, roof, and floor insulation.
- Durable and Weather-Resistant 15mm External Timber Interlocking Cladding.
- Secure and Energy Efficient with Double Glazed Safety Glass Windows and Door.
- Ready-to-Paint Interior featuring 28mm MDF panels with an integrated cavity for electrical wiring (electrician required).
- Long-Lasting, Maintenance-Free 1.2mm EPDM Rubber Roof.
- Generous 13ft 3″ x 10ft (4 x 3m) size, ideal for a spacious home office or garden studio.
Important Information
- A level base is strictly required prior to installation.
- Professional installation is included in the package price.
- Electrical wiring and fitments are not included and must be sourced and installed by a qualified electrician.
- Designed as a versatile, permanent garden structure for multiple uses.
Why Choose Think Assemble
- Quality Assurance: We partner exclusively with top-tier manufacturers like Forest Garden to deliver durable, high-quality structures.
- Professional Installation: Our expert assembly team ensures a hassle-free, perfect setup, saving you time and effort.
- Dedicated Support: From ordering to installation, our UK-based customer support team is ready to assist you every step of the way.
- Fast and Reliable Service: We prioritize efficient processing and scheduling to get your new garden room installed quickly and professionally.
Specification
Overview
| Installation Included | Yes |
|---|---|
| Interior Maximum Height | 206 cm |
| Roof Material | EPDM Rubber |
| Pre-treated Wood | No |
| Double Glazing | Yes |
| Double Doors | Yes |
| Brand | Forest Garden |
| Dimensions | H 250 x W 405 x D 342 cm |
| Manufacturer | Forest Garden |
Customers Love Saving Every Single Day
From first-time shoppers to loyal regulars, our customers agree: everyday low prices beat waiting for a sale. Read their experiences below.
2 reviews for Installed Forest Garden Xtend Insulated Garden Room 13ft 3″ x 10ft (4 x 3m)
Clear filtersOnly logged in customers who have purchased this product may leave a review.























ScotlandsFinest –
First Garden Room – superb quality product
Just wow – the summer house itself is amazing but the installation crew were outstanding.
Clearly this is what they do say in day out so efficient, experienced and excellent at their job.
I couldn’t recommend this purchase highly enough.
David Milton Keynes –
Solid garden room
Lovely size. Well built and solid feeling, but the finish could and should be better. Some of the panels don’t match up and internal finish too cheap looking. Have taken off and had plaster boarded and plastered with the electrics hidden inside. Plus food quality laminate flooring finishes as a nice room. I would of happily paid extra for a better finish.