Contractor Willmott Dixon has started work on a £17m refurbishment and rebuild of Trinity CofE High School in Hulme, Manchester.
The project, designed by Ellis Williams Architects, will see the remodelling of half of the existing Cambridge Street school, as well as the construction of a three-storey teaching and administration block.
The new-build element, funded through the Building Schools for the Future programme, is due for completion in summer 2011 and the refurbishment by spring 2012.
The revamp at the 1,200-place school will include a 120-seat lecture theatre, new netball and tennis courts, as well as new facilities for science, RE, maths, English, design technology, humanities, drama and music.
Headteacher, David Ainsworth, said: "Including ICT and additional refurbishment of the Greer Block, the total investment at Trinity will be in excess of £20m. This much-needed investment will be of huge benefit to our students and staff and will help to keep us at the forefront of educational achievement and attainment."
Cllr Sheila Newman, Manchester City Council's executive member for children's services, added: "Trinity is yet another Manchester school to benefit from the BSF programme. Achievement rates are already very good at the school and I'm sure the improvements will help it go from strength to strength."