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Optional changes
 £/m2 gifa
Timber frame and upper floors in lieu of masonry £31.00
Replace insitu concrete slab to substructure with beam and block floor-£6.00
Replace precast concrete planks with beam and block flooring-£8.00
Replace softwood windows with composite timber/aluminium windows-£1.75
Provide conservatory£8.50
Steel balcony, framework, hardwood flooring and opening french window (each)£2.50
Location factors
The breakdown is based on price levels current in the South-east and should be adjusted by the following factors for other regions:
Inner London£1.07
Outer London£1.02
South West£0.94
East Midlands£0.93
West Midlands£0.95
East Anglia0.95
Yorkshire and Humberside0.98
North-west0.95
Northern1
Scotland0.99
Wales0.93
Northern Ireland0.76