The external links below provide more information about the planning system. Planning Portal Land Registry Guide for householders A guide for advertisers Architects Registration Board - Online register of architects The Royal Institute of British Architects - Online directory of architects The Royal Town Planning Institute - Online directory of planning consultants Hertfordshire County Council - Highways Hertfordshire County Council - Planning Planning Inspectorate - Planning Appeals Planning Appeals Casework Service - Planning Appeals Planning Portal - Building Regulations Planning Portal - Greener Homes & Micro-generation