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Winner: Grimshaw

Grimshaw is a truly international architect. In 2007, it completed four spectacular projects, spanning three sectors, four countries and three continents. Its award-winning Southern Cross Station in Melbourne was its Australian office鈥檚 inaugural project and aided the regeneration of the underdeveloped Docklands area in the city by linking it with the affluent central business district. In Mexico, it converted a 70m-high disused blast furnace into a museum, which was declared a listed monument in October. More recently it has won competitions to design an airport in St Petersburg and a sustainable mixed-use development in New York.

Runners-up:

Assael Architecture

This year Assael Architecture鈥檚 research into volumetric construction resulted in the success of the 23-storey 拢33m Great Northern Tower in Manchester. At the moment it is designing more than 5,000 homes and 1 million ft2 of commercial, retail and leisure space, including the 拢200m masterplan for the Great West Quarter in Brentford, a 拢50m residential development in Westminster and the restoration of St John鈥檚 Hill, a grade II-listed auditorium in south-west London. In all of these projects it has maintained its reputation for high quality design and harmonious relationships with its clients.

dRMM

2007 was a pivotal year for dRMM. Not only was it shortlisted by the Olympic Delivery Authority for the handball arena for the 2012 Games, it also completed its most significant project to date 鈥� Kingsdale school in Dulwich. Following its conviction that sustainability should inform the entire design process, dRMM installed a number of innovative green features, including the UK鈥檚 first 鈥渧ariable skin鈥�, which allows natural ventilation, and a light-controlling roof. The success of this school is reflected in the head teacher鈥檚 testimony: 鈥淲e asked for an aeroplane; the architects gave us Concorde.鈥�

Haworth Tompkins

With projects including the Young Vic Theatre and the National Theatre, it seems the Evening Standard was right when it said: 鈥淣obody who has been the theatre in the past 10 years will have been untouched by Haworth Tompkins.鈥� Over the past year it was even a runner-up for the 2007 Stirling prize. Concurrently, it increased turnover, staff and profitability. It looks set to continue its domination of the arts sector in the coming year with four mixed-use projects in Liverpool worth a total of 拢28m.

HLM Architects

Over the past year HLM has been appointed to a string of the UK鈥檚 biggest health, education and defence projects, including the 拢1bn defence training academy at RAF St Athan, which is the largest investment ever made in Wales. Simultaneously, it has devised sustainable approaches to construction, such as the PassivHaus which heats and cools itself.

PRP Architects

Delivering what it calls 鈥渓ifetime neighbourhoods鈥� is central to PRP鈥檚 ethos, as it believes that places should adapt to the needs of the residents over time. This is demonstrated in its housing projects at home and abroad, including the regeneration of Crossways Estate in Bow, east London, Oxley Park in Milton Keynes and a 240,000m2 luxury residential scheme in Russia. This year it launched PRP Environmental, a multidisciplinary team of specialist architects, energy consultants, quantity surveyors, sustainability consultants and environmental engineers that is intended to help clients achieve high sustainability standards.

Sheppard Robson

During the Second World War, Sheppard Robson developed a modular housing system that used technology transferred from the aviation industry. Seventy years on, it is still at the forefront of innovation, as is demonstrated by the Lighthouse, the UK鈥檚 first zero-carbon house, which includes photovoltaic panels, a biomass boiler and a wind catcher. Then there鈥檚 Stockwell Park High School, the first 鈥渆xcellent鈥� rated 好色先生TV Schools for the Future project.