Replacing locks after moving home or a break-in: questions to ask

Changing the locks on your home is one of those tasks that can slip down the list, but it has real consequences for security and insurance. Whether you have just moved, lost a set of keys, or had a break-in, knowing when and how to replace locks—and what to ask your locksmith—can help you make sound choices for your property.

Situations when replacing locks is worth considering

There are a few common situations where fitting new locks makes practical sense. Each has its own risks and reasons, but the questions you ask a locksmith will often be similar.

• Moving into a new home: Even if you are handed a full set of keys, you have no way of knowing how many copies are in circulation. Previous owners, tenants, tradespeople or neighbours may still have keys. Replacing the locks removes this uncertainty.
• After a break-in or attempted break-in: If your home has been targeted, the integrity of the locks may be compromised, or copies of keys could have been taken. Some insurance policies expect you to upgrade or change locks after such an event. The police may also give you a crime reference number, which your insurer will likely ask for.
• Lost or stolen keys: If you cannot account for all copies, the only way to be sure of security is to fit new locks. This also applies if you have loaned keys and not had them returned, or if a set has simply disappeared.
• Change of tenancy: Landlords should consider changing locks between tenants to avoid old keys still working. This is good practice for tenant security and can help avoid disputes about access.
• A broken or worn mechanism: Locks do wear out. If you notice difficulty turning the key, or if the lock is sticking or loose, a replacement is often safer than a repair, especially on external doors or windows.

Ask about lock types and security standards

Not all locks are created equal. There are different types for wooden, composite, and uPVC doors, and each has its own security features. Ask the locksmith to explain what type is recommended for your door and why.

• British Standard kitemarked locks: Ask if the lock being fitted meets the relevant British Standard (often BS3621 for mortice locks or BS8621/BS10621 for others). These standards are recognised by insurers and are designed to withstand common break-in methods. The lock should carry the British Standard kitemark, which is a reassurance of independently tested security features.
• Cylinder types for uPVC and composite doors: Many modern doors use a euro cylinder lock. Ask about anti-snap, anti-bump, and anti-pick features. Lock snapping is a common method used by burglars, so anti-snap cylinders are worth considering. The locksmith should be able to explain which features are being provided.
• Upgrading old locks: If your existing locks are not up to current standards, ask what options are available, especially if you want to meet insurance requirements or improve security.

If you are comparing locksmiths, listings on Annuvell Local show whether a business offers lock replacement and uPVC door repairs, which can help you shortlist suitable providers.

Insurance requirements: check before you agree to anything

Home insurance policies sometimes require specific lock standards for external doors and windows. If you do not meet these, a future claim could be affected.

• Check your policy wording: Before you arrange a lock replacement, read the section of your insurance policy that deals with locks and security. It may specify British Standard or other recognised grades, and may have different rules for main doors, patio doors and windows.
• Ask the locksmith to confirm standards in writing: Request that the invoice or confirmation states the exact lock standard and model fitted. This written record can be useful if you ever need to make a claim.
• Provide the right information to your insurer: After a break-in, your insurer may ask for details about the new locks and a crime reference number from the police. Keep all paperwork together.
• Discuss any uncertainties: If you are unsure whether a particular lock is accepted by your insurer, ask the locksmith for the technical details and check directly with your insurance provider before agreeing to the fitting.

Questions to ask about keys and key control

How keys are managed is just as important as the lock specification itself. A few careful questions now can help avoid problems later.

• How many keys are supplied? Find out how many keys come with the new lock as standard, and how much extra copies will cost if you need more.
• Are the keys restricted or patent protected? Some lock systems use restricted or patented keys, which cannot be copied at any high street shop. Ask the locksmith if this applies to your new lock, and who is authorised to cut additional keys. Restricted systems can offer better control but may be more expensive to duplicate.
• Who else can obtain a copy? Inquire whether the locksmith keeps a record of key holders or if a security card is needed to get more keys made. This can be helpful for landlords or shared accommodation.
• What happens if you lose all keys? Ask what recovery options are available if all keys are lost or stolen. Some modern locks have master key or code systems that allow re-keying without full replacement.

Why written confirmation of installation matters

Getting clear, written details of what has been fitted is more than just admin—it can make life much easier if you ever need to prove what was done.

• Proof for insurance claims: Insurers may ask for evidence of lock type and standard if there is a claim for theft or forced entry. An invoice or receipt that states the lock model and standard is usually sufficient. Keep this paperwork with your home documents.
• Future reference: If you ever move or need to change keys again, having a record of the lock type and key reference can speed up the process.
• Resolving disputes: Written confirmation helps avoid misunderstandings with landlords, tenants, or insurers about what was fitted, when, and why. It also means you are less reliant on memory or the trader’s own records.

If you are comparing providers, Annuvell Local's compare tool lets you check which businesses offer written quotes or certificates, helping you pick those who are clear on paperwork.

Comparing locksmiths and getting quotes

Getting more than one quote is always wise, especially for planned work. It allows you to compare lock types, key systems, and how clearly each business answers your questions.

• Describe your needs in detail: When requesting quotes, mention the reason for replacement (new home, lost keys, break-in), the type of door (wooden, uPVC, composite), and any specific insurance requirements.
• Ask each locksmith to state the lock standard: Request that your quotes specify the make, model, and British Standard (if relevant) of the lock to be fitted. This makes it easier to compare offers and check against your insurance policy.
• Check for uPVC door repairs if needed: If your door is damaged after a break-in, you may need both a lock replacement and a repair to the door itself. Some locksmiths handle both, which you can check on their Annuvell Local listing.
• Review contact details and credentials: On Annuvell Local, you can see which locksmiths have verified contact details and a completed ownership check (the Verified badge). This adds a layer of confidence when choosing whom to contact.
• Request quotes from several providers: Use the Request Quote feature to send your description to more than one business and compare the responses. Written quotes make it easier to track what each provider is offering.

What to do after a break-in

Replacing locks after a break-in has some extra steps. Take these into account before you make calls or bookings.

• Contact the police first: Always report the incident and get a crime reference number, which insurers often require.
• Secure the property: If the door or window is damaged, you may need boarding up or temporary protection until locks can be replaced.
• Document any damage: Take photos and keep notes on what was affected. This can help when discussing repairs and replacements with both locksmiths and insurers.
• Communicate with your insurer: Let them know what has happened, what you plan to do about locks, and check if they have any specific requirements before you proceed.

If you are still deciding which local providers to approach, you may find it helpful to read How to choose a locksmith for more on credentials and what to expect.

Next steps

Write down why you need your locks changed and make a note of any insurance requirements. Check the type of doors and windows you have so you can describe them clearly. Then find locksmiths near you, compare what each one offers, and request a quote that states the lock standard to be fitted. If you are moving soon, you might also find Finding local trades and services before you move home useful for planning ahead.