Professional Lock Installation in Dulwich — Fitted Right, First Time
A lock is only as effective as its installation. A cylinder that's 5mm too long creates a snapping attack lever arm. A deadbolt that doesn't fully engage its strike plate offers only the illusion of security. A mortice case fitted at the wrong height leaves the door structurally weak at the lock point. We've been installing locks in Dulwich and South London properties since 2014 — we understand the standards, the common door types, and the installation details that determine whether a lock actually works as intended.
- BS3621:2007+A2:2012 five-lever mortice deadlock installation
- TS007:2012 three-star anti-snap cylinder fitting
- UPVC multipoint lock and mechanism installation
- Composite door lock replacement and upgrade
- Smart lock and keypad entry installation
- Measurement, alignment and full adjustment included
- Restricted and patented key system installation
Why Professional Installation Changes Everything
A BS3621-rated mortice deadlock fitted by an inexperienced installer can fail to provide BS3621 protection if the mortice case is set too shallow, the strike plate isn't properly recessed, or the door is misaligned so the bolt doesn't fully extend into the keep. The lock carries the certification; the protection requires the installation to match it.
Every lock we install is fitted to the manufacturer's published specification. Mortice dimensions are checked against the case size. Cylinder length is measured to the door thickness. Strike plates are morticed into the frame — not screwed to the surface — and backed with reinforced steel keep boxes where the frame material warrants it. These details matter for security, and they matter for whether an insurance claim is paid following a break-in.
Why Choose TrustLock for Lock Installation?
Precision Installation Every Time
Cylinder length is measured to the exact door thickness. Mortice cases are cut to precise dimensions. Strike plates and keeps are properly morticed into the door frame — not surface-mounted. Everything is checked under load before we leave.
Trusted Lock Brands
We supply and fit Yale, ERA, Ultion, Mul-T-Lock, ABS, Avocet and Chubb — UK-tested brands whose products meet or exceed British Standards. We don't fit cheap imported hardware that bypasses independent testing.
Insurance Compliance Confirmed
We check the specific wording of your home insurance schedule where available and install locks that satisfy the stated requirements. We provide written confirmation of the lock grade, brand and standard for your records.
Honest Product Guidance
Not sure whether you need a sash lock, a deadlock, a nightlatch or a multipoint mechanism? We explain the options in plain English, with price differences and security trade-offs clearly stated. You choose based on understanding, not sales pressure.
The Lock Brands We Recommend — and Why
TrustLock supplies and installs locks from Yale, ERA, Ultion, Mul-T-Lock, ABS, Avocet and Chubb. Each brand has product lines that meet specific British Standards — BS3621:2007+A2:2012 for mortice deadlocks, TS007:2012 for cylinders, BS EN 12209 for mechanical locking devices.
For anti-snap cylinders, our first recommendation is the Ultion three-star (TS007:2012), which has an internal anti-snap point, anti-pick pins and anti-drill hardened steel at both ends. The Yale Platinum and ABS Master are strong alternatives for specific door profiles. For mortice deadlocks, ERA Fortress and Chubb 5-lever produce consistent, well-manufactured products with a long service life. We don't fit own-brand or unbranded hardware — standards certification is a minimum, not a selling point.
How It Works
- 1
Door and Frame Assessment
We assess the door material, thickness, existing hardware, and frame condition. We check the existing mortice dimensions if replacing a lock in-kind, and evaluate whether any frame reinforcement is needed.
- 2
Product Recommendation
We recommend specific products — named brand, model and British Standard rating — with a clear explanation of why each is suitable for your door and security requirements.
- 3
Careful Installation
Installation is carried out to manufacturer specification. Mortice cases are cut precisely, cylinders are correctly sized and set, strike plates are morticed into the frame, and all fixings are tightened to the correct torque.
- 4
Key Handover and Testing
We test the lock with every key cut, confirm smooth operation under door pressure, and hand over all keys with the invoice confirming the lock specification. Documentation for insurance is included where relevant.
BS3621 and TS007 — What They Mean for Your Insurance
BS3621:2007+A2:2012 is the British Standard specification for high-security mortice deadlocks for timber doors. TS007:2012 is the Kitemark standard for attack-resistant euro cylinders, rated one to three stars by resistance level. Three-star is the highest grade and the one recommended by Secured by Design, the UK police-backed security programme.
Many home insurance policies require BS3621-rated locks on all final exit doors. Some policies have been updated to require TS007 cylinders specifically. Installing the wrong product — or having it installed incorrectly — can result in a claim being rejected. We check requirements before installation and document compliance after. If your policy wording is unclear, we can advise on what the standard requires in practice.
Common Questions
Lock Installation FAQs
Answers to the questions we hear most often.
For most Dulwich timber front doors, we recommend a combination of a BS3621:2007+A2:2012 five-lever mortice deadlock and a TS007:2012 three-star anti-snap cylinder nightlatch. This combination satisfies most home insurance requirements and protects against cylinder snapping and lever attacks.
Yes. Composite doors typically use multipoint mechanisms with specific euro cylinder sizes. We identify the correct mechanism for your door profile (common brands include Avocet ABS, Ultion, Yale Platinum) and install it with the correct cylinder length — critical for avoiding an anti-snap vulnerability.
A cylinder replacement takes 20–30 minutes. A new BS3621 mortice deadlock installation (cutting the mortice, fitting the case, strike plate, and testing) takes 60–90 minutes. A full multipoint mechanism replacement on a UPVC or composite door takes 60–120 minutes.
Critically yes. A cylinder that protrudes more than 3mm beyond the face of the door furniture creates a lever arm that makes snapping attacks easier. We measure door thickness precisely and fit cylinders flush to the rose, eliminating this vulnerability.
Coverage
Lock Installation Across South London
We provide lock installation services throughout Dulwich and the surrounding South London area.
- lock installation in Dulwich
- new locks in East Dulwich
- Peckham lock fitting
- lock installation in Camberwell
- new locks in Brixton
- Herne Hill lock fitting
- lock installation in Southwark
Don't see your area? Contact us — we cover all of South London.
Need Lock Installation in Dulwich?
Call us now for a fixed price and fast response across South London.