The Calderbridge branch is the company’s fourth and largest yard. The two-acre site represents a £1.4m investment and was developed on the site of a small sawmill customer. Seven jobs were created.

"The owner was retiring and we wanted somewhere close to Sellafield because we do a great deal of business with the nuclear industry, including general maintenance and there is always large construction, formwork," said Jacksons director Daniel Mossop.

Jacksons at Workington is premdominantly a roof truss factory with sites at Whitehaven, Barrow and now Calderbridge for retail and trade. The company stocks graded timber, sheet material, trusses, joists, joinery materials and hardware. Each site also has a joinery department.

"We need to be close to Sellafield, but this is also general expansion. Our engineered timber has been hit in recent years, but the other sides have been right back up there at pre-2007 levels," Mr Mossop said.

The building has solar panels, enhanced insulation, LED lighting throughout and is clad in Metsä Thermowood. A biomass boiler is fuelled by the company’s wood waste.

"We decked an area down by the river which flows by the site just to draw attention to what we have done. I’m sure this is the most eco-friendly yard in the country," Mr Mossop said.

The company received £80,000 towards the facilities as part of ongoing aid from British Energy Coast through the Nuclear Decommissioning Authority.