A company that provides free milk to schools and nurseries is building one of the greenest offices in Lincolnshire.
Lincoln-based Cool Milk will cut carbon emissions on its new Langworth site by 75 per cent with energy-saving kit.
Energy costs will also be cut by half at the site, called Bridge House.
Solar panels will provide electricity and heat water while rainfall will be collected to provide water for toilets.
Mechanical heat recovery ventilation systems will keep a flow of fresh air and pre-warm it in the winter. And air source heat pumps will help with heating and cooling the building.
Ultra-low-energy LED lighting and manipulation of natural light will dramatically cut electricity bills.
There will also be external insulation to help maintain a stable internal temperature.
The new subsidiary HQ is being built by Gusto Construction, which is run by Lincolnshire businessman Steff Wright.
Bridge House will house employees from Langworth Resources Ltd, which acts as a head office for Cool Milk's UK dairy interests.
Founder and chief executive Jon Thornes said the company had moved out of Langworth four years ago but he was keen to re-establish a base in the village.
"Cool Milk had to move out of Langworth due to lack of space and lack of facilities," he said.
"I decided then that I wanted to have some presence in the village where the business started 15 years ago.
"A modern resource-efficient building will pay for itself in the long run by giving reduced running costs and a good place to work."
Designed by SGA Associates, the building is thought to be the first in Lincolnshire to use a new construction material called the Thin Joint solid block system.
It uses "aircrete" blocks and a thin layer of adhesive rather than a traditional block and mortar method, which allows for quicker construction and a more air-tight building.
The work, costing around £400,000, is well on, with the roof now finished.
Mr Wright said: "This is a really exciting project.
"It is always good to work with forward looking companies like Cool Milk who are keen to build cutting-edge offices, which will both reduce their future energy costs and create a pleasant working environment for their staff.
"Not only will it be one of the most energy efficient offices in the county but we are expecting to complete the project quicker because of the innovative building techniques."
Cool Milk works with local authorities to supply milk to children aged under five in pre-schools, nurseries, children's centres and crèches.