Halcrow Group Limited is a multinational engineering consultancy company, based in the United Kingdom.Halcrow is one of the UK's largest consultancies, with origins stretching back to 1868. The UK-based consultancy specialises in the provision of planning, design and management services for infrastructure development worldwide. With interests in transportation, water, maritime and property, the company is undertaking commissions in over 70 countries from a network of more than 90 offices.