The first security task in a new home is to establish who can still get in. Even when every key handed over appears present, copies may have been held by former occupants, estate agents, cleaners, builders, relatives or neighbours. Changing or reconfiguring the relevant external locks restores a known starting point.
The second task is to test the whole property. New owners often concentrate on the front door while side gates, garage connections, patio doors, accessible windows, alarm accounts and key safes remain unchanged.
This guide provides a staged move-in plan so urgent security is completed without replacing suitable hardware blindly.
Last updated: 27th July 2026
New Home Security: The First Priorities
- Restore key control: assume previous occupants, agents, contractors or neighbours may hold copies until affected locks are changed or reconfigured.
- Test every entrance: include back, side, garage, patio, outbuilding and shared doors—not only the front door.
- Record what is installed: photograph lock markings, cylinders, alarm panels, key safes and smart devices before changing them.
- Reset digital access: remove previous accounts, users, codes and Wi-Fi connections from connected security products.
- Check insurance and fire safety: match policy wording and preserve safe internal escape, fire doors and window egress.
- Stage improvements: secure urgent faults on day one, then complete targeted upgrades after living with the property.
Before Completion: Ask the Right Questions
Request information about keys, alarm codes, smart devices, access fobs, communal entrances, window keys, garage remotes and key safes. Ask whether locks were changed during previous tenancies or renovation.
Answers may be incomplete, so treat them as background rather than proof. Photograph visible hardware during viewings where permitted and note doors that appear stiff or damaged.
Day One: Change or Reconfigure External Access
Prioritise front, rear, side, garage and any other keyed entrance. Depending on the door, this may involve replacing a euro cylinder, rim cylinder, mortice lock, digital credential or compatible access-control component.
Do not automatically replace an entire multipoint system when only the cylinder controls the keys. Diagnose the mechanism and correct alignment separately.
Include Outbuildings and Garages
Garage doors, personnel doors, sheds and gates may use old padlocks, shared keys or remotes that were not part of the main handover. They can protect valuable items or create access to tools and the house.
Reset remotes and codes where possible, replace unknown-key locks and inspect internal doors from attached garages.
Identify the Door and Lock Types
Record whether entrances are timber, uPVC, composite, aluminium, sliding, French or fire doors. Note mortice locks, nightlatches, euro cylinders, multipoint strips and internal thumbturns.
This inventory prevents unsuitable purchases and helps compare policy requirements with the exact installed arrangement.
Test Doors Open and Closed
Operate every lock with the door open, then closed. Watch for stiffness, scraping, loose handles, missed latching and the need to lift or pull the door.
A new key or cylinder should not be used to mask alignment. Correct hinge, keep, frame or seal pressure before a mechanism fails.
Check Window Security
Find every window key and test accessible openings, including those reached from flat roofs or side structures. Inspect handles, mechanisms, hinges, keeps, glazing and designated escape windows.
Do not leave window keys visible when the property is empty, but ensure occupants can exit safely where required.
Reset Alarm Systems
Change user codes, duress codes and contact details, remove previous users and test every zone. Confirm who receives alerts, whether monitoring remains active and how the system behaves during a power or network failure.
If the installer or monitoring contract is unknown, identify it before relying on the system as a security layer.
Take Ownership of Smart Security
Factory-reset or properly transfer smart locks, doorbells, cameras, garage controllers and hubs. Create new accounts, use unique passwords, enable two-step verification and remove former household members.
Check the minimum security-update period and whether the product remains supported. A device still linked to a previous owner should not be considered secure.
Secure the Home Network
Change router administration and Wi-Fi credentials, install updates and reconnect smart devices deliberately rather than continuing inherited settings. Separate guest access where supported.
Document which devices are connected. Unknown cameras, hubs or sensors should be identified or removed safely.
Review Spare Keys and Key Safes
Remove keys hidden outside and change key-safe codes. Decide who genuinely needs emergency access and use a controlled process.
Do not store a key inside the same unsecured outbuilding or beside identifying address information. Keep any restricted-key cards separately and securely.
Inspect Lighting and Visibility
Test external lights after dark, replace failed lamps and adjust sensors. Check side passages, rear doors, driveways and paths without creating glare or nuisance.
Trim vegetation that hides entrances while preserving reasonable privacy and the property’s design.
Update Deliveries and Address Information
Redirect post, close or update old accounts and arrange secure parcel delivery. Letters and packages addressed to former occupants can reveal occupancy uncertainty.
Avoid posting detailed images of keys, alarm panels, floor plans or exact moving dates on social media.
Control Contractors During Renovation
Move-in work often involves builders, decorators, cleaners and delivery teams. Issue the minimum access needed, use temporary credentials where possible and keep an access record.
After work ends, recover keys, cancel codes and reassess locks if uncontrolled copies may exist. Building dust and door adjustment can also affect new mechanisms.
Read the Insurance Schedule
Check how the policy describes external-door locks, accessible windows, alarms and unoccupancy. Do not rely on a seller’s statement that a lock is “insurance approved”.
Keep invoices, product details and photographs after changes. Ask the insurer for written clarification where the actual door type does not fit the wording neatly.
Preserve Fire Safety and Escape
Test smoke and carbon-monoxide alarms according to applicable guidance and confirm escape routes. Do not add locks, chains or smart devices that interfere with a flat entrance fire door, self-closing or keyless egress where required.
Every regular occupant should understand how to exit in darkness or smoke, including children and people with reduced grip or mobility.
A 30-Day New-Home Security Plan
| Timing | Priority actions |
|---|---|
| Before moving | Collect key, alarm, smart-device, garage and policy information |
| Day one | Restore key control, secure faults, reset codes and lock all accessible openings |
| First week | Complete door/window audit, test lighting, alarms, cameras and outbuildings |
| First month | Plan upgrades, document products, review contractor access and confirm insurance |
| Ongoing | Maintain keys, credentials, alignment, batteries, updates and annual reviews |
Do Not Replace Suitable Locks Without a Reason
Changing keys is often necessary, but a compatible cylinder change may achieve that without replacing a sound multipoint mechanism. Conversely, keeping an old lock because it turns smoothly may be inappropriate if keys are uncontrolled or the product cannot meet a confirmed requirement.
Define the objective—key control, repair, security rating, accessibility or smart access—then choose the least disruptive dependable solution.
Create a Home Security File
Store photographs, lock and key details, alarm manuals, smart-device support information, invoices, guarantees, insurer correspondence and emergency contacts. Keep the file securely and make it available to the people who need it.
This record becomes especially valuable after a lost key, fault, burglary attempt or future sale.
Repeat the Security Review After the Move Settles
The first-day check is necessarily urgent, but it should not be the last. After several weeks you will understand which entrances are used most, where deliveries are left, which outside areas remain dark and whether children, older relatives or visitors struggle with any lock or escape route.
Repeat the walk-round after the first month and again when seasons change. New stiffness, condensation, movement, failed lighting or forgotten contractor access may only become visible after normal life begins. Prioritise changes that improve both dependable locking and everyday use rather than collecting technology that no one maintains.
New-Home Lock Changes and Security Checks in Northampton
KMI Locksmiths can inspect and change locks for new homeowners in Northampton and surrounding areas, including timber-door locks, euro cylinders and uPVC or composite mechanisms, while identifying alignment and key-control issues.
Gather every key and photograph the door edge, handles and visible markings before the visit. Explain whether you want only new key control or a wider security and accessibility review.
New Homeowner Security Checklist
- Change or reconfigure affected external locks and codes.
- Include garages, sheds, side doors, gates and communal access.
- Test doors and windows open and closed.
- Reset alarms, cameras, smart locks and network credentials.
- Review spare keys, key safes and contractor access.
- Check lighting, visibility and parcel arrangements.
- Confirm insurance wording and preserve documentation.
- Protect fire doors, escape routes and accessible operation.
A secure move-in begins with known access: once keys, codes and accounts are under your control, improvements can be planned around the real property rather than guesswork.