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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 London | 1.13 |
| Outer London | 1.08 |
| South East | 1.05 |
| South West | 0.99 |
| East Midlands | 0.98 |
| East Anglia | 1.00 |
| Yorkshire and Humberside | 1.03 |
| North West | 1.00 |
| Northern | 1.05 |
| Scotland | 1.04 |
| Wales | 0.98 |
| Northern Ireland | 0.80 |