The event - the first of its kind - was organised by trade magazine Construction News to recognise commitment to the industry's sustainability agenda.
Morris, which operates across the North West, Midlands and South of England, beat off competition from Lovell Partnerships and Barratt Developments plc to win the category.
The judging panel - which included Paul King, chief executive of the Green Building Council - praised the company's commitment to brownfield regeneration. Over 90 per cent of its housing is built on previously developed land, compared to a Government target of 60 per cent by 2008.
The company was also praised for introducing energy saving measures across all of its properties, including K-Glass (the equivalent of triple glazing), energy efficient appliances and water-saving sanitary ware.
Its landscaping designs - including an innovative 'garden on stilts' being constructed at its Linen Quarter scheme in city centre Manchester - were also highlighted for their positive impact on the environment, along with the company's inclusion of natural environmental features on its developments.
Commenting on the award, Tim Smit, founder of The Eden Project, said this had been the hardest fought category, but Morris had shown a 'positive response to the green agenda' by introducing sustainable features across all of its properties and developments.
Mike Gaskell, Group Chief Executive for Morris, said: "We work closely with local authorities and government agencies to regenerate brownfield sites, transforming derelict buildings and disused land into well-designed, energy-efficient housing developments which provide sustainable communities for their residents.
"As a leading housebuilder, we believe we have a responsibility to fully address the sustainability agenda on behalf of our customers .This means ensuring that the properties we build meet the market's requirements while promoting and protecting the environments surrounding them. This award is recognition of that commitment."