Stronghold Locks and Doors is a South London based fully mobile locksmith, alarm, and door fitting service. Fast, dependable, and straight-talking we always let you know our prices up front so there are no unexpected call outs or fees. • Nearly 4 decades of experience in the industry • All costs agreed upfront • No call out fee • Work 100% guaranteed Stronghold Locks and Doors offers a straight-forward, honest service with advice for all your locks, uPVC doors, windows, and alarm needs. Domestic and commercial locksmith services, uPVC door fitting and alarm services across South London and Kent. We make sure your home is safe and problem locks are secure. Services include; repairs and replacement door and window locks, access control systems, wireless alarm systems, emergency lockouts, van locks, fitting new uPVC doors or canopies, and security upgrades.