City Of London Building Contractors Ltd - general building contractor & maintenance services City Of London Building Contractor Services Limited provide a range of building and maintenance services. We are an established team with 25 years of experience driven by complete customer satisfaction and offer the best service possible at the best price. GENERAL RENOVATION / KITCHEN AND BATHROOM INSTALLATION / EXTENSIONS AND CONSERVATORIES / ELECTRICS / PLUMBING / DRYWALL AND PLASTERING / LOCKSMITH SERVICES