Caches are placed with 'permission presumed' - the guidelines say: "By submitting a cache listing, you assure us that you have adequate permission to hide your cache in the selected location." However some locations do require specific permission before caches can be placed. Examples include Nature reserves and Sites of Special Scientific Interest (SSSI) and the National Trust and Forestry Commission. The GAGB has done much work with these and other organisations to get permissions setup and has an extensive database of landowners, maps and contact details explaining how to go about getting permission. You should consult this before placing your cache.

For security reasons the SW1 postal code area of London including Whitehall, St James Park and Green Park come under a security agreement with the Metropolitan police. Caches cannot be placed in this area unless they meet the conditions of the agreement.

When you get permission you should add the full details as a 'Note to Reviewer' log on the cache page for the reviewer to see. The information should include the name of the person who gave their permission and their telephone number or email address. The text of any email correspondence or letter giving permission should be copied there too. Please note these logs are not visible when the cache is published.

You should also add the permission information on your cache page description. It not only tells finders that the cache area is OK to go to but new cachers finding your cache can see that permission may be needed for certain locations and will consider that when they place their first caches. It is of course a courtesy to the organisation or landowner who gave permission to acknowledge it. Something like, "Cache placed with the kind permission of the wardens of the reserve" or "Cache placed with the kind permission of the manager of the local National Trust office". Don't put in peoples names, the full permission details should be added in the note to the reviewer when you submit the cache.

	GAGB landowner database. Details of who allows caches and who doesn't and how to get permission.
	Caches on Church property or Railway property. Specific information for the UK.
	Caches in nature reserves and SSSI's. How to find out where they are and where to get permission.
	Caches on Forestry Commission, Woodland Trust & National Trust land. How to find out where they are and where to get permission.
	Caches in the London SWI Metropolitan police area
	Ministry of Defence Access land and training areas
	Dartmoor and the letterboxing code