Willems Serrurier provides locksmith services across Brussels and Belgium, with emergency availability 24 hours a day, seven days a week, as well as appointments. The company serves customers in French and Dutch and asks callers to confirm address availability, estimated arrival time, and pricing before a technician sets out. Its services include opening doors that are shut or blocked, repairing or adjusting locks, replacing cylinders and locks, and supplying or reproducing security keys subject to the model, documentation, and stock. It also installs multipoint locks, connected locks, smart locks for short-term rental properties, and EZVIZ video door viewers, including setup where offered.

Willems describes an approach based on diagnosing the problem, explaining the proposed method, and confirming the total price in writing before work begins. Pricing shown online is indicative and may depend on the lock, timing, parts, and other factors. The company also provides practical locksmith guides and information about service areas throughout Brussels, Wallonia, and Flanders.