Trinity House comprises a Fraternity of almost 400 Younger Brethren drawn from various sectors in the maritime community but around 70% are from the Royal Navy or Merchant Navy. About 12% are Pilots or Harbour Masters.
The Elder Brethren constitute the Court of the Corporation. By statute, all must first have been admitted as Younger Brethren but many are elected because of the influential positions they hold, or have held, elsewhere. The majority, however, are current or former trustees of the Trinity House Charities or Directors of the Lighthouse Service.