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Ships within 48 hours · Estimated delivery Aug 10 - Aug 15
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Description
Mercia 3m x 3m(D) Self Build Insulated Garden RoomTransform your garden into a stylish all season retreat with the 3 x 3m Self Build Insulated Garden Room. Featuring 72mm double skinned walls, double glazed windows, and full insulation, it's perfect for work, play, or relaxation. Modular design, premium shiplap cladding, and UK craftsmanship ensure lasting durability, style, and versatility. Key Features 72mm double skinned walls for superior insulation Fully insulated walls, roof & floor for all
Transform your garden into a stylish all-season retreat with the 3 x 3m Self-Build Insulated Garden Room. Featuring 72mm double-skinned walls, double-glazed windows, and full insulation, it's perfect for work, play, or relaxation. Modular design, premium shiplap cladding, and UK craftsmanship ensure lasting durability, style, and versatility.
Key Features
- 72mm double-skinned walls for superior insulation
- Fully insulated walls, roof & floor for all-year use
- Modular design allows flexible door & window placement
- Double doors and double-glazed windows for light & warmth
- Flat roof with durable mineral felt for modern look & rain runoff
- Made in the UK from ethically sourced timber
- All fixtures, fittings & step-by-step build guide included
Specifications
| Feature | Detail |
|---|---|
| External Width | 317 cm |
| External Depth | 334 cm |
| Height (Ridge) | 237 cm |
| Wall Thickness | 72 mm (Double-skinned) |
| Construction | Shiplap Cladding |
| Insulation | Walls, Roof & Floor Fully Insulated |
| Doors | Double Door |
| Windows | Double-Glazed |
| Roof & Floor | Tongue & Groove |
| Roof Covering | Mineral Roofing Felt |
| Guarantees | 10-Year Anti-Rot / 1-Year Parts Warranty |
| Assembly | DIY with detailed guide & video |
| Timber Source | Ethically sourced, UK-made |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 4
Solid Purchase
Size: X-Small, Color: Red
This coat delivers strong quality and clean style. The fabric feels sturdy and warm, and it holds its shape well in cold weather. The color stays bright, and the stitching looks secure. The fit is true to size, and the coat layers easily over sweaters without feeling bulky.
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Reviewed in the United States on December 8, 2025
★★★★★ 5
Coat lover
Size: Large, Color: Black
This coat is warm, stylish, and very well made. The stitching is clean and the fabric feels durable. It’s perfect for layering and works great with jeans or leggings. I love that it keeps me warm without feeling bulky. Great value for the price.
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Reviewed in the United States on February 23, 2026
★★★★★ 5
Good quality
Size: Medium, Color: Navy
I gave this as a Christmas present and he loved it. I was worried when I ordered it that the quality might not be that good, but I worried for nothing.
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Reviewed in the United States on May 18, 2026
★★★★★ 3
This is more like a long cardigan sweater, than a coat.
Size: Small, Color: #2 Blackandwhite
This is more like a long cardigan sweater, than a coat. It doesn't have much structure & the pocket placement is too high for a coat. That being said, it's very soft & comfortable. As far as sizing goes, the sleeves run a bit long, but the coat, itself, runs a bit tight. I'm 5'10'' and a small fit me, but I wouldn't be able wear anything very thick under it & I'm thin. It's light & machine washable. I almost kept it to wear as a long sweater, but it looks like a coat ,so I sent it back. If you're very thin with long arms and don't mind the pockets being a bit high, then this could be a very stylish piece for you. Otherwise, I would pass.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
i would definitely recommend. stick with your regular size or size up for a less slim fit
Size: Small, Color: Black
I usually wear a medium, I ordered a small based on reading the reviews. I am 150lbs 5’4”. this coat fits great for me personally. it’s not bulky, it’s not baggy. it is a slim fit jacket, definitely more on the slender side. when i raise my arms above my head , the sleeves do come up a bit. I would suggest sticking to your normal size or if you want a less slim fit with a tiny bit more room, sizing up wouldn’t be an issue. the coat is super soft and has some weight to it. i would recommend this jacket, it is warm and a nice piece for formal attire.
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Reviewed in the United States on February 18, 2026