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Optional changes
 £/m2 gifa
Lift£20.00
Replace precast concrete planks to substructure with insitu concrete slab£9.50
Add radon sump system £12.00
Timber frame and upper floors in lieu of masonry cavity wall£26.00
Extra over for wallpaper to bedrooms£14.25
Convert one bedroom to become treatment room-£4.00
5 sunpipes to roof including all sealants and work to roof and ceilings£12.25
Location factors
The breakdown is based on prices current in the West Midlands and should be adjusted by the following factors for other regions: 
Inner London1.13
Outer London1.08
South East1.05
South West0.99
East Midlands0.98
East Anglia1.00
Yorkshire and Humberside1.03
North West1.00
Northern1.05
Scotland1.04
Wales0.98
Northern Ireland0.80