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Changing only the cylinder is a 30-45 minute operation per door. The mechanical lock remains, and we only replace the interior cylinder where the key fits. The new key is completely different and will not work with the old one. This is the most economical option and the one we recommend when the lock is of good quality and in good condition. Changing the complete lock costs more and is justified when the lock is old or of low quality and we want to take advantage of the change to increase the security level. This operation takes 60-90 minutes per door. When a client calls us urgently (keys left inside, lost key, jammed lock), we first assess if non-destructive opening is possible. Most standard locks can be opened with professional techniques (lock picking, impressioning, pin manipulation) in 15-30 minutes without damaging the cylinder. This saves the client the cost of replacing the complete cylinder. For high-end anti-bumping cylinders, non-destructive opening may not be possible, and the only solution is to drill the cylinder and replace it, which is more expensive but leaves the door as new with a new, reinforced security cylinder. Every Monday we open fault reports for flats that have been closed for three months. Here the problems are not the same as in other cities.

Official manufacturer's warranty 5-10 years depending on brand and model. Plus 30 days on labour. For isolated chalets, single-family homes in affected areas, or owners with previous experience of attempted burglaries, we recommend a high-security cylinder such as Cisa Astral S, Mul-T-Lock MT5+, Tesa T80 Plus, or Mottura Champions. These raise the classification to EN1303 grade 6, adding all anti-features (bumping, picking, drilling, extraction). They come with a manufacturer's burglary insurance guarantee. This guarantee is relevant. If, despite everything, they break in and you can prove the cylinder was tampered with, the manufacturer covers part of the damage. All this investment in a security cylinder loses its meaning if key copies can be freely made at any local hardware store. The registered key of a security cylinder can only be duplicated by the official manufacturer's distributor upon presentation of the owner's card that we provide during installation. Without this card, no copy is possible. This means you control exactly how many keys exist and who has them. You will never have the uncomfortable doubt of whether the local locksmith or a copier might have kept your key pattern for future use.

The price of key copies and duplicates in Castelldefels typically ranges from €50 to €385. The final figure depends on the property's condition, materials, and labour time. We always provide a fixed quote before starting. For apartments in blocks with neighbours, an active community, and natural surveillance, we recommend a medium-to-high security cylinder such as Tesa T80 or Cisa Astral. Effective anti-bumping, registered key (cannot be copied without your authorisation), EN1303 grade 5 certification (resistance to manipulation for years). Reasonable cost and a significant real improvement over the standard. For a home on the Costa Blanca with medium risk (an urbanisation with neighbours, not isolated), we recommend a medium-to-high quality anti-bumping cylinder. Brands like Tesa T80, Mottura Champions, or Cisa Astral are our best sellers. These cylinders have security pins that prevent the bumping technique, that sharp blow with a special key that opens any standard cylinder in less than 60 seconds. They come with a registered security key, which cannot be copied without authorisation at any hardware store. And they have European EN1303 certification, which guarantees resistance to manipulation for years. Their cost is reasonable, and the real security improvement is enormous.