LEED certifies new buildings, BREEAM allows evaluating already constructed facilities.
BREEAM requires the participation of a certified specialist. For LEED it is not a must.
LEED sets higher demands on the environmental friendliness.
LEED gives greater freedom to the designer in choosing the solution to comply with the standard.
LEED focuses on the comfort of users, ventilation and air conditioning systems, and automotive availability.
BREEAM focuses on water use, noise insulation and the availability of bicycle infrastructure.