Health and Safety Executive

Separation distances

How to use Tables 1 to 8

Internal separation distances are given in Tables 1 and 2. External separation distances are given in Tables 3 to 8.

Find out which separation distance table you should use.

  Explosives process building Explosives magazine
Explosives process building Tables 1 and 2 Tables 1 and 2
Other occupied buildings within the boundary of the licensed site except those described in the next line of this table Tables 3–8* Tables 3–8*
Occupied buildings within the boundary of the licensed site meeting one or more of the following criteria:
  • The building is not in the occupation of the applicant.
  • The building has more than one storey, suitable for occupation, above ground.
  • The building is normally occupied by more than 20 people
Tables 3–8† Tables 3–8†
Explosives magazine Tables 1 and 2 Tables 1 and 2
Other store within the boundary of the licensed site Tables 1 and 2 Tables 1 and 2
‘On-site’ bulk flammable gas/flammable liquid storage Tables 3–8 Tables 3–8
Any off-site building or work namely any:
  • railway, aerodrome, canal (in active use) or other navigable water, dock, pier or jetty
  • market place, public recreation or sports ground or other open place where the public are accustomed to assemble;
  • public highway
  • private road which is the principal means of access to a church, chapel, college, school, hospital or factory
  • river wall, sea wall, reservoir, dwelling
  • retail shop
  • government and public buildings, church, college, chapel, school, hospital, theatre, cinema or other building where the public are accustomed to assemble
  • motorway
  • caravan site for which planning permission for this use had been granted and on which is located an occupied caravan for a total period in excess of 28 days in any one calendar year
  • factory
  • building or works used for the bulk storage of petroleum spirit, gas, or other inflammable substances
  • buildings or works used for the storage and manufacture of explosives or of articles which contain explosives
Tables 3–8 Tables 3–8

* Use half the appropriate distance required to a building in Tables 3–8, depending on the hazard type.
† Use the appropriate distance required to a building in Tables 3–8, depending on the hazard type.


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Updated: 21.10.11