Which areas does Locks & Alarms cover?
Locks & Alarms Ltd is based in Crayford, Dartford (DA1 4NP) and covers the whole of Kent. Checkatrade review history carries the proof: completed jobs in 18 postcode districts, covering Dartford, Crayford, Bexley, Bexleyheath, Erith, Belvedere, Sidcup, Welling, Gravesend and Sevenoaks, plus jobs in SE2, SE28, ME19, CR3 and W11.
Core towns and postcode districts
The business is registered at 10 Beech Walk, Crayford, Dartford DA1 4NP, and the core of its work sits in the DA postcode area around it: Dartford (DA1, DA2), Crayford (DA1), Bexley (DA5), Bexleyheath (DA7), Erith (DA8), Belvedere (DA17), Sidcup (DA14, DA15), Welling (DA16) and Gravesend (DA11, DA13).
Sevenoaks (TN14, TN15) extends the coverage south into Kent, with Checkatrade-verified alarm installation and annual servicing in both districts.
Verified jobs further out
The review history also shows completed jobs beyond the core towns: floodlight installation in SE2, door handle replacement and a CCTV power supply unit replacement in SE28, alarm servicing in ME19 and W11, and a wireless alarm installation in CR3.
Coverage does not stop at the reviewed districts: Locks & Alarms Ltd covers the whole of Kent, and the 24/7 emergency call-out runs county-wide. The list reflects where reviews have been posted, the proof, not the boundary. If your postcode is not listed, ask.
How this list is verified
Locks & Alarms Ltd has 661 customer reviews on Checkatrade, checked on 16 August 2026. Each Checkatrade review displays the postcode district of the job, and every district named on this page appears in that review history.
That makes the coverage list an evidence trail rather than a marketing radius: 18 postcode districts: DA1, DA2, DA5, DA7, DA8, DA11, DA13, DA14, DA15, DA16, DA17, SE2, SE28, TN14, TN15, ME19, CR3 and W11, each with at least one completed, reviewed job.