Composite door replacement keys typically cost between £15 and £80 each, depending on the lock system and whether you need a locksmith to cut them on site. The British Security Industry Association notes that high-security euro cylinders, common in composite doors, often require registered key cutting to maintain security (GOV.UK, 2026).
The final price depends on your door’s locking mechanism. Most composite doors use a multipoint locking system with a euro cylinder or a separate key for the handle. If you have the original key code or a secure card, online cutting can cost £10–£25. Without these, a locksmith visit adds call-out charges of £40–£80. The type of cylinder, standard, anti-snap, or anti-bump, also affects the cost, with higher-security versions costing more.
Standard key cutting from a code or card
If you have the original key code or a security card supplied with the door, you can order replacement keys online or from a local hardware store for £10–£25 each. Many modern composite doors use a “restricted key profile,” meaning only authorised dealers can cut them, which keeps the price higher than standard mortice keys. Energy Saving Trust confirms that restricted key systems improve security but limit where you can get spares (Energy Saving Trust, 2026). Always check if your door came with a key registration card, without it, you may need a locksmith.
Locksmith call-out and on-site cutting
If you have lost all keys and have no code or card, a locksmith worth visiting to cut a new key from the lock cylinder. Typical call-out fees range from £40 to £80, plus £15–£30 for each key cut. The total for a single replacement key then lands at £55–£110. TrustMark-registered traders often charge a fixed fee for this service (TrustMark, 2026). If the cylinder is damaged or worn, the locksmith may recommend replacing the entire lock barrel, adding £25–£50 to the cost.
Replacing the euro cylinder instead
In some cases, replacing the whole euro cylinder is cheaper than cutting a lost key. A new 3-star anti-snap euro cylinder costs £15–£40 from a DIY store, and fitting it yourself takes about 10 minutes with a screwdriver. If you arrange a locksmith to supply and fit one, expect £60–£100 total. The Government’s Secured by Design initiative recommends 3-star cylinders for composite doors to resist snapping attacks (BRE, 2026). This approach gives you new keys and upgraded security for a similar or lower cost than a single key cut.
Frequently Asked Questions
Between £15 and £80 each. With a key code or security card, online cutting costs £10–£25; without them, a locksmith adds £40–£80 call-out (GOV.UK, 2026).
Yes, if you have the original key code or security card. Authorised dealers can cut restricted keys for £10–£25, as confirmed by Energy Saving Trust (2026).
They use restricted key profiles for security, limiting cutting to authorised dealers. High-security euro cylinders also cost more, with locksmith visits raising the total to £80 (BSIA, 2026).
