Technical Information

Dimensions

Standard

Internal floor width 4.0m
Internal height 2.4m at highest point
Internal width 4.8m or 6.8m at widest point
External footprint width 4.4m
External width at widest point 5.4m
External overall height 3.2m
External height with floor at ground level (feet 0.5m below ground level) 2.7m

Wide

Internal floor width 6.0m
Internal height 2.4m at highest point
Internal width 6.8m at widest point
External footprint width 6.4m
External width at widest point 7.4m
External overall height 3.2m
External height with floor at ground level (feet 0.5m below ground level) 2.7m

Materials

Finnish spruce and birch plywood structure
Sheep’s wool insulation with polyester anti-slump, permanently treated with Borax
Breathable cloth and airtight, foil vapour control membranes
Triple glazed glass units
High-performance airtight windows
High-performance airtight exterior doors
Solid timber interior and exterior cladding
Water-borne acrylic paints and lacquers
Solvent-free adhesives
Lime exterior render
Water and root proof roofing membrane

Tech specs

	Current UK regulations 2010	Future UK regulations 2016	Passivhaus requirements	Standard building	Green Unit
Floor insulation	0.25W/m²K	TBD	0.15W/m²K	0.22W/m²K	0.15W/m²K
Wall insulation	0.35W/m²K	TBD	0.15W/m²K	0.3W/m²K	0.15W/m²K
Ceiling insulation	0.25W/m²K	TBD	0.12W/m²K	0.24W/m²K	0.12W/m²K
Airtightness	10m³/hr/m²	3m³/hr/m²	0.6m³/hr/m²	10+ m³/hr/m²	0.6m³/hr/m²
Air changes per hour	10ach	3ach	0.6ach	7ach	variable to 10ach
Air quality	Medium	Medium	High, filtered	Medium	High, filtered
Air moisture content	30% – 60%	30% – 60%	35% – 55%	Below 40%	45% – 50%
Comfort temperature	Not specified	Not specified	17⁰ – 20⁰	22⁰	17⁰ – 19⁰
Annual energy use per annum	Not specified	39 – 46 kWh/m²	15kWh/m²	200 kWh/m²	15kWh/m²
Embodied energy	Not measured	44% – 60% reduction	Minimum possible	129 – 239 kW/m²	81 kW/m²
Recyclability	No requirement	No requirement	Encouraged	Low recyclability	Fully recyclable
Testing procedure	SAP	SAP	Physical test	SAP	Physical test

We’ve installed a new ARC™ at an environmentally-conscious holiday resort, Great Field Farm, near Canterbury in Kent

Green Unit ARC Glazed window end We designed and manufactured the eco-building offsite in modular sections at our production site in Culham, Oxfordshire, and delivered to the Great Field Farm site virtually complete.

Unique, curved eco-building

The unique curved design mimics the glorious natural environment at Great Field Farm, and the use of sustainable materials creates a calm and relaxing getaway for holiday goers in the heart of the Kent Downs. The building is positioned on a prime spot within Great Field Farm overlooking green vistas and is well placed to benefit from stunning sunsets and the night’s sky.

Environmentally friendly building features

The ARC is equipped with environmentally-friendly features such as:

a green roof
a heat exchange system
infra-red underfloor heating
and smart sensors to regulate pollen, CO₂ levels, ventilation, heating and lighting.

Green Unit ARC Kitchen and living area The building’s three bedrooms comfortably sleep six people, and it boasts a north-westerly facing glazed end where guests can enjoy stunning sunsets within the state-of-the-art kitchen and a beautiful living space.

Happy customers

Mr and Mrs Castle, the owner-managers of Great Field Farm, look forward to welcoming guests into their ARC™ - fondly named the Bumble Barn - at the end of May. The new accommodation offers Mr and Mrs Castle a unique opportunity to expand their environmentally-conscious business, allowing the couple to cater to the demand for larger families and groups.

Lewana Castle said that she and her husband “just fell in love with the concept and design of the ARC™ as soon as they saw it.”

“We chose the Green Unit ARC as we liked the idea that it can be built under cover in the winter, is delivered practically complete, and that disruption on our site is minimal, so not affecting our other holiday guests.

“We pride our business on offering guests the space and freedom of the outdoors, but with the warmth and comfort of a house, and the new ARC building offers exactly that.

“Our guests will love the new experience of living in the round of the curved building, and I think they’ll be interested in the ARC’s sustainable features and clever technology. We’re looking forward to welcoming guests into our new ARC accommodation, and we’re sure that it’s an excellent investment for our business.

Jonathan Finnerty MD Green Unit Jonathan Finnerty, Managing Director of Green Unit, said “the Great Field Farm project marks an important milestone for Green Unit as we deliver the ARC into what we expect to be the first of many businesses within the UK tourism sector.”

Find out more about our buildings for holiday lets, or request a brochure and a price guide.

Further Information