Green Mineral Felt | Project Timber™
10% off the Grandmaster range with code GM10 Offer ends in 1d: 20h: 50m: 54s
Uncategorized · Composite · Fully insulated

Work happens at the
bottom of the garden.

A year-round, fully insulated garden office — composite cladding, pre-insulated panels, delivered and built in days.

Green Mineral Felt
From £—

Build your Uncategorized.

Green Mineral Felt

Made in Britain
Selected size: None
Description

A fully insulated, all-season garden office designed to be used every day of the year. Low-maintenance composite cladding pairs with pre-insulated modular panels in the walls, floor and roof — warm in winter, cool in summer. Double glazing and a UPVC door with multi-point locking come as standard, every building is hand-crafted in Nottinghamshire, and it is backed by a 15-year anti-rot guarantee on the composite. Delivered as pre-assembled panels for a faster build.

Key features
  • Superior composite timber cladding
  • Fully insulated — walls, floor & roof
  • UPVC door with multi-point locking
  • 80mm total wall thickness
  • Insulated metal roof
  • Double glazing as standard
  • 15-year anti-rot guarantee*
  • Easy self-assembly
View full specifications

Free delivery to most mainland UK postcodes*
Delivery available from Sep, 25th Fri · choose your delivery date at checkout
£4,461.00
inc. VAT

Prices as per the live configurator. Paint/trim swatch colours are indicative approximations.

Get the highlights.

Watch the showcase
Composite cladding

Composite cladding

The look of wood, the toughness of composite

80mm thick insulated wall
80mm

Total wall thickness · doubled-up framing · fully insulated

Double glazing and UPVC door

Double glazing & UPVC door

Multi-point locking, as standard

15-year anti-rot guarantee

15-year guarantee

Anti-rot — composite*

Insulated metal roof

Insulated metal roof

Ultimate weather protection

Easy self assembly

Easy self-assembly

Pre-insulated, pre-assembled panels

In the box

Everything you need, in one delivery.

No hidden extras and no surprise add-ons. Your Uncategorized arrives complete — every panel, fixing and fitting ready to go.

Green Mineral Felt
  • Pre-assembled, pre-insulated wall panels
  • Pre-fitted multi-foil insulation & primed internal cladding
  • Weather-resistant LP Strongcore composite cladding
  • Heavy-duty, fully insulated metal roof & fixings
  • Double-glazed front timber windows & opening side windows
  • UPVC single door with multi-point locking
  • Tongue-and-groove floor
  • Eze base and fixings
  • Guttering
  • All fixings and fittings
  • Easy-to-follow, illustrated instructions
Configure your Uncategorized
Why the Uncategorized

Eight reasons it's built differently.

Superior composite timber

LP Strongcore composite — the look of wood, with far less upkeep.

Fully insulated

Walls, floor and roof — comfortable in every season.

UPVC door

Domestic-standard door with multi-point locking.

80mm total wall thickness

Doubled-up framing for strength where it works hardest.

Insulated metal roof

Heavy-duty steel with a 40mm insulated core.

Double glazing

Warmer, quieter and more secure, all year round.

15-year anti-rot guarantee*

Backed for the long term on composite.

Easy self-assembly

Pre-insulated, pre-assembled panels that bolt together simply.

Green Mineral Felt
YOUR GARDEN, YOUR SPACE

Warm in winter.
Cool in summer.

The Uncategorized is insulated in the walls, floor and roof with high-performance multi-foil. Its layered design traps heat in the cold months and reflects it in summer — achieving U-values comparable to 120mm of glass wool, in a far slimmer profile that leaves more room inside.

The heavy-duty metal roof adds a 40mm insulated core with a steel outer shell and white-gloss interior — built to shrug off British weather, season after season.

120mm
Glass-wool U-value equivalent
40mm
Insulated metal roof core
Composite cladding

The look of timber, with far less upkeep.

LP Strongcore composite is wood fibres bonded with high-quality resins — the natural character of wood with the strength and low maintenance of composite. It resists weather, moisture, fungal growth and decay, and gives the Uncategorized its modern anthracite finish.

Green Mineral Felt
Built to last · Made in Britain

Engineered stronger where it counts.

The modular wall panels feature doubled-up timber framing at every join, adding strength exactly where the building works hardest — with an 80mm total wall thickness built to take daily use and weather in its stride.

Each Uncategorized is hand-crafted at our Nottinghamshire workshop on the edge of Sherwood Forest, from hand-selected Scandinavian slow-grown timber, and quality-checked before it reaches your garden.

80mm
Total wall thickness
50+
Years' experience
UK
Designed & made
Green Mineral Felt
Assembly

Most of the build is already done.

Your Uncategorized arrives as pre-assembled, pre-insulated panels — designed to fit through a standard UK doorway and slot together with far fewer parts than a traditional log cabin. A quicker, simpler build, whether you do it yourself or bring in help.

Every building includes clear, step-by-step illustrated instructions. We recommend two people with basic DIY know-how — or add our assembly service at checkout and we'll handle it for you.

Make it yours

Configure it around how you'll use it.

Tongue and groove timber floor

Floor

Upgrade to 19mm tongue-and-groove for extra support underfoot.

Laminate flooring

Laminate flooring

Trend Oak Grey or Summer Oak Brown for a finished, home-like feel.

UPVC white windowUPVC graphite window

Windows

Double-glazed UPVC — choose white or graphite.

UPVC door options

Door

UPVC single door — choose your colour and positioning.

Paint and trim colour options

Paint & trim

A range of colours — watch the colour options.

Building assembly service

Assembly service

Prefer not to build it? Let our team do it for you.

Build & price yours
Green Mineral Felt
SPACE, DONE PROPERLY

Your commute is now the garden path.

Turn the bottom of your garden into a private, professional workspace — quiet, insulated and distraction-free. Just as at home as a gym, studio, hobby room or therapy space.

Specifications

SelectSize
SelectMeasurements

Overall Dimensions

Overall Width253 cm
Overall Depth229.2 cm
Total Wall Thickness (incl. insulation)80 mm
Width (internal)229 cm
Depth (internal)174.3 cm

Eaves & Ridge

Eaves Height (inc. floor)230.7 cm
Eaves Height (excl. floor)218.2 cm
Ridge Height (inc. floor)240.2 cm
Ridge Height (excl. floor)227.7 cm
Eaves Height (internal)204.4 cm
Ridge Height (internal)212.4 cm

Doors

Door Height180 cm
Door Width73 cm
Door Opening (H × W)H180 × W73 cm

Windows

Glazing Thickness4–20–4 mm
Frame Thickness (H × W)2.7 × 4.4 cm

Floor & Base

Overall Floor Size (W × D)249 × 194.3 cm
Base Size244 × 189.3 cm

Materials

Cladding9mm LP Strongcore composite
Floor materialTongue & groove
Roof materialGalvanised steel & foam insulation
Roof coveringGalvanised steel
GlazingDouble glazing

Features

Building typeGarden room
Windows4
Roof stylePent
Cladding styleComposite board
Locking systemUPVC multi-point
U-value, metal roof0.49 W/(m²·K)
U-value, walls & floor0.31 W/(m²·K)
Pre-assembled panelsYes
Interchangeable windowsNo
Fixtures & fittingsYes

Questions, answered.

Do I need planning permission?
Usually not. Our buildings are designed to stay under 2.5m in height and fall under "permitted development," so planning permission typically isn't required. Always check with your local authority if you're in a conservation area, national park or listed building, and note the building shouldn't be used as self-contained accommodation. We don't offer legal advice — please confirm with your local planning authority before ordering.
Do I need a base?
Yes — all garden buildings must be assembled on a solid, level foundation. Our purpose-made Eze Base provides a solid, level foundation with minimal groundwork; ask us to add it to your order. Assembling on an unsuitable foundation may invalidate your warranty.
Is it difficult to assemble?
No. The panels arrive pre-assembled and pre-insulated and fit through a standard doorway. We recommend two people with basic DIY tools, and every building comes with clear, illustrated instructions. Prefer not to build it? Add our assembly service at checkout.
How is it delivered?
Kerbside, by lorry or van. You choose a preferred delivery date at checkout and we do our best to meet it — at busier times we may need to agree an alternative date with you, and we'll keep you informed throughout. Please ensure there's clear access in front of your property on the delivery date.
★ 15-year anti-rot guarantee

Bought with confidence.

Free delivery to selected postcodes, and Made in Britain.

Customer photo
★★★★★

"Genuinely warm in winter — I work in here every day now. Build quality is excellent."

— Verified buyer
Customer photo
★★★★★

"Panels went together far faster than I expected. The composite finish looks premium."

— Verified buyer
Customer photo
★★★★★

"From order to install was seamless. The team kept me informed the whole way."

— Verified buyer

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Your building is
ready when you are.

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