Policy information sourced from the Hillingdon Local Plan: Part 1

BE3 Investigation of Sites of Archaeological Interest and Protection of Archaeological Remains

The local planning authority will ensure whenever practicable that sites of archaeological interest are investigated and recorded either before any new buildings, redevelopment, site works, golf course or gravel extraction are started, or during excavation and construction. Development which would destroy important archaeological remains will not be permitted. 

For more information please see Appendix 5 of the Local Plan: Part 1