Unless this option is selected the calculator will make an allowance for external works. The allowance might include walls and fences, paths and drives, sheds and garages and drainage as appropriate. The nature and extent of external works can vary significantly from property to property and the cost included is only intended as a general figure to cover typical facilities. Special or expensive items such as swimming pools or long boundaries are not included and must be allowed for separately.
If No externals is selected there will be no allowance for external works (except garages for which the allowance is controlled by the Garage Spaces option above.