Describe the actual problem and property. Check who can authorise the work, and use direct urgent help if the situation is unsafe. Local reporting contacts are below; this enquiry service does not provide emergency dispatch.
Why change a lock?
Quick answer
Lost or unreturned keys, a failed component, damage after a break-in or an unsuitable security specification can justify replacement. These are different reasons and may lead to different work. Explain whether you want to prevent an old key working, correct a mechanical fault or improve resistance to attack. An upgrade should suit the whole door and frame. A new lock cannot compensate for poor hinges or rotten timber, and an entry problem may need alignment work as well as replacement.
| Purpose | What the proposal should address |
|---|---|
| Prevent use of a missing key | Which entrances or managed systems still use that key? |
| Restore operation | Is the fault in a cylinder, mechanism or surrounding door? |
| Improve security | What compatible specification is proposed for the complete entrance? |
Lost keys and a change of occupier
If you cannot account for all copies, discuss changing the appropriate keyed component. Mention linked locks, communal doors and any restricted or managed key system. A tenancy or managed building may impose arrangements for authorisation and key supply, so check directly with the relevant person. Do not send key photographs or identifying security details through this form. Record who is to receive the new keys and how obsolete copies will be dealt with. Replacement should give legitimate occupants reliable access without bypassing agreed management arrangements.
Cylinder or complete lock?
On some doors, a cylinder can be changed while the rest of the locking mechanism remains sound. Other failures involve the case, latch or multipoint gearbox. Ask the locksmith to identify the component and explain why that scope is sufficient. The new cylinder must be the correct size and compatible with the handle and door; appearance is not enough. A complete mechanism replacement should also account for the keep positions and normal operation. Do not assume every lost-key job needs a new door.
Ask for separate prices where there is a genuine choice between retaining a sound mechanism and replacing more of the system. The cheaper option is useful only if it achieves the intended function and security. Conversely, replacing serviceable hardware may add cost without addressing door movement. A written proposal should explain the choice and any limitations, including unavailable parts, unsuitable surrounding material or a need for other repair work before the new component can be fitted reliably.
Useful next steps
Security standards and your insurer
Suffolk Police recommends suitable tested cylinder upgrades and explains the importance of correctly securing multipoint doors. Ask for the exact product, its applicable certification and how it works with existing hardware. Check your own policy or managing agent’s requirements rather than assuming a badge satisfies every contract. We do not promise insurance acceptance or a burglary-proof entrance. A product specification and a properly fitted complete door are related but distinct; keep records so future checks do not rely only on a verbal description.
Timber, composite and historic doors
A replacement must suit the material and construction. Extra cut-outs in old timber, an incompatible case or a projecting cylinder can create new problems. In Sudbury, check restrictions before substantial alterations to a listed or otherwise controlled door or surrounding fabric. A compatible component change and wholesale door replacement are different proposals. Ask the locksmith to preserve sound joinery where practical and explain any work requiring a joiner or other specialist. The postcode and conservation context do not establish the condition of the entrance.
Keys, exit arrangements and access needs
Consider how the door is used from inside as well as outside. Tell the professional about household mobility needs, children and any required escape arrangements. The right approach depends on the door, property use and applicable requirements; do not add a lock that obstructs an essential exit. Ask how spare keys, restricted copying or a thumbturn affect the chosen arrangement. Discuss these directly with the installer rather than requesting a product solely because it has the highest advertised rating. Demonstrate ordinary use before accepting completion.
A complete replacement quote
What to confirm
Request the part specification, number of keys, attendance, fitting, adjustments and VAT. Clarify whether the old mechanism is retained, whether extra keys cost more and what any warranty covers. Agree how a failed door/frame condition will be addressed if discovered during installation. There is no invented Sudbury average on this site. A basic cylinder swap, a security upgrade and a full mechanism replacement have different scopes, so compare the written detail before the total.
- The precise replacement part and why it is appropriate.
- Who can approve the work and receive the keys.
- Normal operation, exit arrangements and completion records.
After fitting the new lock
Check every supplied key and normal operation from both sides, where appropriate. Ask for the product details and retain the invoice. Store spare keys securely and avoid labels showing the property address. If other locks remain on an old shared key, establish whether the change achieves your intended security goal. Report stiffness or alignment problems promptly rather than forcing the new hardware. For planned work, send a clear enquiry including the postcode, door type and reason for replacement.
Useful next steps