British Standard Locks in Darlington — BS3621 Supply and Fit
British Standard BS3621 locks are the minimum required by most UK home insurance policies for external doors. The DL area — which includes Darlington and extends to Durham, Stockton, Middlesbrough, Bishop Auckland — has a lot of Victorian terraces and 1960s estates where the original lock specification either no longer meets current requirements or was never insurance-compliant to begin with. We supply and fit BS3621 mortice deadlocks and TS007 cylinders across the whole area.
What BS3621 actually means
BS3621 is the British Standard for thief-resistant locks. It covers five-lever mortice deadlocks for timber doors and sets minimum requirements for anti-drill, anti-pick, and anti-saw performance. Most standard insurance policies require at least one BS3621 lock on every external door, though some policies now also require TS007 3-star rated cylinders on euro-profile lock types. We know exactly which products meet each standard and can confirm compliance in writing.
Mortice locks versus cylinders
The main split is between traditional mortice locks (fitted into the edge of a timber door) and cylinder-operated mechanisms (used on uPVC and composite doors and on night latch systems). For timber doors, a BS3621 five-lever mortice deadlock is the standard requirement. For cylinder-based locks, TS007 3-star cylinders with a matched door handle or escutcheon are required. These are different products with different fitting methods — we bring stock of both.
Why customers in Darlington choose us
- ✓We know the standards
BS3621 and TS007 have specific technical requirements. We know them, test to them, and document compliance.
- ✓Written certificate
After every job, you get written documentation of what was fitted and which standard it meets.
- ✓Supply and fit, one visit
We bring the locks. No need to buy parts in advance or make a separate fitting appointment.
- ✓Clear before/after assessment
We tell you which existing locks are compliant before fitting anything new.
- ✓12-month warranty
On all fitted locks and cylinders.
