Patio & French Door Locks

uPVC patio sliders and French doors use two distinct locking arrangements. Sliding patio doors rely on a hook-bolt multipoint mechanism driven by a central gearbox, while French doors — the outward-opening double-leaf style — are most often secured with a multipoint strip running up the active leaf, plus a french door mortise lock set at mid-rail height on the meeting stile. Over years of use, the gearbox wears out, the hook bolts refuse to extend fully, or the rebated mortice lock that ties the two leaves together develops a stiff or jammed bolt. Cold winters accelerate the problem: uPVC frames expand and contract with temperature changes, throwing the multipoint keeps out of alignment so that engaging the lock requires brute force on the handle. At that point most people start lifting the door while turning the handle — a temporary fix that puts extra stress on the hinges and the gearbox alike.

A euro cylinder that has begun to feel loose in its housing is a separate but equally urgent issue. Loose cylinders on rear French doors are a known entry method for opportunistic burglars in south-east London; a cylinder that rocks side to side can sometimes be gripped and snapped rather than picked. We replace vulnerable cylinders with anti-snap, anti-pick, anti-drill options that meet TS007 3-star standards, and we fit them with the correct length so no excess cylinder protrudes beyond the escutcheon. If you are unsure whether your existing cylinder is at risk, our technician will measure and assess it on the spot at no extra charge.

Our trained technicians handle the full spectrum of patio and French door lock work. For sliding patio doors, that means stripping out a failed gearbox, sourcing a matching replacement mechanism, and re-aligning the hook bolts so they seat cleanly into the keeps without lifting the sash. For French doors, we cover everything from swapping a worn french door lever lock or french door knob lock escutcheon to fitting a new 5 lever rebated mortice lock for french doors where the existing mortice lock has seized or the case has cracked. We also deal with the question of how to lock French doors with lever handles correctly — a surprisingly common call, since some lever handle sets are paired with latch-only mechanisms that offer no dead-locking at all. We can upgrade those to a proper deadlocking multipoint or add a surface-mounted french door mortise lock set at the mid-rail so both leaves are secured independently. All work is carried out with the aim of being damage-free wherever the door condition allows, and our technicians are experienced enough to work on most common uPVC profile brands without needing to refer the job back to the frame manufacturer.

Services we provide for patio sliders and French doors include: uPVC multipoint gearbox replacement, hook bolt alignment and adjustment, roller and sash track realignment, euro cylinder replacement (anti-snap upgrade), french door mortise lock replacement, 5 lever rebated mortice lock fitting, french door lever lock replacement, french door knob lock replacement, escutcheon and backplate replacement, handle spindle replacement, door hinge adjustment and replacement, door keeps and striker plate repositioning, multipoint strip replacement, emergency boarding and temporary security after glass break-ins, door frame repair following forced entry, shooting bolt replacement on the passive French door leaf, door alignment correction after subsidence or frame warp, anti-snap cylinder upgrade on existing multipoint locks, TS007 3-star cylinder supply and fitting, letterbox plate reinforcement on French door glazing bars, door closer fitting on inward-opening French doors, patio door secondary blocking bar fitting, security assessment and written report for letting agents or housing associations, out-of-hours emergency call-out for failed locks on evenings, weekends and bank holidays, and commercial door locksmith work for Bermondsey businesses with rear yard patio access doors.

Bermondsey's housing stock is genuinely varied, and that variety matters when a locksmith is diagnosing a door problem. The converted leather-trade warehouses around Tanner Street and Morocco Street tend to have heavy steel-framed glass doors that need entirely different hardware from the slim uPVC French doors on the 1990s-built housing association estates closer to the Silwood Street area. Victorian terraces between the Old Kent Road and Bermondsey Street frequently have rear patio doors added during kitchen extensions — these are often older uPVC frames from smaller profile systems that have been discontinued, meaning the gearbox has to be sourced from a compatible alternative range rather than a like-for-like swap. Our technicians know the common profile systems fitted across SE1, which lets them arrive with a realistic selection of parts rather than making a first visit just to identify what is needed.

Being mobile and local means we can send a locksmith straight away when you call 020 7871 2569, and we are usually with you in about 30 minutes. That matters most at night, when a French door that will not lock leaves your ground-floor flat or garden-level rear room exposed. We answer the phone around the clock — 24/7 on evenings, weekends and bank holidays — because lock failures rarely wait for a convenient moment. Our 24 hour locksmith London service covers lock change London jobs, door lock replacement London work, and upvc door lock repair London calls across the SE1 postcode and the neighbouring districts we regularly serve.

We do not quote figures on this page because the right price depends on several factors: the specific lock or mechanism needed, the condition of the existing frame, the time of day or night, travel distance from our current location, and whether parts need to be sourced beyond our standard van stock. What we do commit to is confirming an exact price with you on the phone before anyone leaves to come out — no vague estimates that expand once we are on site, and no call-out charge ambiguity. The price you agree on the phone is the price on the invoice. If the job turns out to be more involved than the initial description suggested, we stop and discuss the revised scope before proceeding. For commercial door locksmith customers — cafes, offices and workshops with rear patio access in Bermondsey — we can also arrange a convenient time within business hours or attend out of hours if the security need is urgent. Call 020 7871 2569 any time — we answer 24/7 and are ready to help with everything from a jammed patio slider on a Sunday evening to a full French door lock replacement first thing on a weekday morning.