ALU Concept 70 H | 4.41m x 4.18m Garden Room | Aluminium Sliding Doors | Fully Installed | Mainland UK

ALU Concept 70 H | 4.41m x 4.18m Garden Room | Aluminium Sliding Doors | Fully Installed Across Mainland UK

The ALU Concept 70 H is a beautifully proportioned 4.41m x 4.18m Nordic garden room that brings genuine quality and modern Scandinavian design to any outdoor space. With 16.1m² of indoor floor area, 70mm slow-grown Nordic spruce massive log construction, a flat roof with storm-secured wall beams, and a full-width aluminium sliding door configuration, this is a building that is as practical as it is striking.

The door arrangement — a 400cm x 206cm sliding set paired with a 200cm x 206cm sliding set — opens the building generously to the garden, flooding the interior with natural light and creating a seamless indoor-outdoor connection. Whether you are setting it up as a home office, a garden gym, a yoga studio, a pool room, a hobby room, or a family retreat, the ALU Concept 70 H gives you a high-quality, adaptable space that will serve you for decades and hold its value long into the future.

The price shown includes the full supply and professional installation of your ALU Concept 70 H anywhere on Mainland UK, including the base preparation and installation and the complete construction of the structure. There are no hidden costs and no separate groundworks quotes. What you see is what you pay.

For locations outside of Mainland UK — including islands and certain remote areas — please contact us for a tailored delivery and installation price before ordering.

Engineered for Strength and Longevity

The ALU Concept 70 H is built to a specification that goes beyond the standard. 70mm slow-grown Nordic spruce massive logs deliver the wall mass and thermal performance that a year-round garden room demands. The roof construction uses massive roof beams and 18mm thick tongue-and-groove boards — a robust assembly that is rated for higher snow loads and built to perform in the full range of UK weather conditions.

Every kit includes a storm strip set that connects the bottom and top log on each wall, preventing individual wall beams from lifting in high winds. It is a detail that reflects the engineering rigour behind this building — designed not just to look good on day one, but to remain structurally sound for decades. The roof carries a 20cm all-round overhang, providing practical weather protection at the eaves and a clean, finished profile from every angle.

We install log cabins, garden rooms, garden offices, garden gyms, saunas, pool rooms, and all types of outdoor buildings across Mainland UK. Every installation is carried out by our own team, from foundation preparation through to final handover.

Key Features

• 16.1m² indoor floor area — 4.41m x 4.18m base footprint
• Flat roof — ridge height 264cm — roof area 461cm x 438cm — 20cm all-round overhang
• 70mm slow-grown Nordic spruce massive logs — dense, durable, and thermally efficient
• Massive roof beams with 18mm tongue-and-groove boards — rated for higher snow loads
• Storm strip set included — secures wall beams against wind uplift
• Aluminium sliding doors:
  • 400cm x 206cm (main sliding set)
  • 200cm x 206cm (secondary sliding set)
• Double-glazed tempered glass throughout
• Floor included as standard
• Natural untreated finish — ready to treat, stain, or paint
• Base preparation and installation — included. No separate groundworks quote.
• Full structural build — included. Supply and construction of the complete building as part of the price.
• Full installation on Mainland UK — included. Professionally installed by our own team.

What Is Included in the Price?

• Supply and delivery of your ALU Concept 70 H
• Base preparation and installation — included. Thermal blocks, concrete slab, gravel pad, crawl-space, wooden post foundation, or paving stones — assessed and installed as part of the price. No separate groundworks quote.
• Full construction of the structure — included. The complete building, built and installed by our own team.
• Floor — included as standard
• Aluminium sliding doors — included (400cm x 206cm and 200cm x 206cm sets, double-glazed tempered glass)
• Storm strip set — included
• Site clean-up and handover

For locations outside of Mainland UK, please contact us for a delivery and installation price before ordering.

Optional Upgrades

The following upgrades are available at an additional cost. All upgrade prices include supply and installation.

For all other requirements — including electrical packages, decking, plastering, painting, internal lining, and any other bespoke additions — these are priced entirely separately based on your specific needs. We can discuss and quote for these directly, or you are welcome to bring in your own trades. Contact us to discuss your requirements.

Product Specifications

Interested? Let's Talk.

Every project is different. Contact us today and we will get back to you promptly.

Frequently Asked Questions

Does the price include the base and the full build?

Yes. The price includes base preparation and installation, and the complete construction of the structure. There are no hidden costs and no separate groundworks quotes.

Is the floor included?

Yes — the floor is included as standard.

What is the storm strip set?

The storm strip set is included in every kit. It connects the bottom and top log on each wall, preventing individual wall beams from lifting in high winds. It is a structural detail that ensures the building remains secure and weathertight in all conditions.

What types of buildings do you install?

We install all types of garden buildings across Mainland UK — log cabins, garden rooms, garden offices, garden gyms, saunas, pool rooms, and more. Every installation is carried out by our own team from foundation to handover.

What foundation types are available?

We can install on thermal blocks, a concrete slab, a gravel pad, crawl-space, wooden post foundation, or paving stones. The most appropriate option is assessed on a site-by-site basis and installed as part of the price.

Do you install outside of Mainland UK?

We install across Mainland UK as standard. For island locations and areas outside of Mainland UK, please contact us before ordering and we will provide a tailored delivery and installation price.

Can I add insulation?

Yes — insulation is available as an optional upgrade, with all prices including supply and installation. Floor insulation is £720, a roof insulation package is £1,260, wall insulation is £1,875, or the full floor, roof, and wall insulation package is £4,095. Please contact us to discuss the best option for your intended use.

Can I upgrade the roof covering?

Yes — an EPDM rubber roof covering upgrade is available for £1,250. For a flat roof, EPDM is the right long-term choice — fully fitted, seamless, and virtually maintenance-free.

What about electrics, decking, plastering, and other specialist work?

All specialist fit-out work is priced entirely separately based on your specific requirements. We can discuss and quote for these directly, or you are welcome to bring in your own trades. Contact us to talk through what you need.

Do I need planning permission?

In many cases a building of this size will fall within Permitted Development rights for residential properties in England and Wales, provided it is used as an ancillary garden building, is sited within the curtilage of a dwelling house, and does not cover more than 50% of the garden area. We always recommend confirming with your local planning authority before ordering.

What does the natural untreated finish mean?

The building is supplied in its natural Nordic spruce finish — untreated and ready for you to apply your preferred exterior stain, oil, or treatment. We can also supply and apply an exterior treatment as an optional upgrade.

How long does installation take?

Typically one to two days, depending on site conditions and foundation type. We will confirm the installation schedule with you in advance.

How long does delivery take after ordering?

Typically 6 to 8 weeks from order confirmation. Please contact us if you have a specific deadline.