The cost of house call services for a locksmith in San Mateo depends on many factors. It varies considerably depending on the location of the client, the type of lock that needs to be fixed, and the time of the day. One must not expect that the rate of locksmith service at 9am in the morning will be the same when the service needs to be rendered at 12 midnight. Service fees during holidays and weekends are also different as compared to normal days. The fee of a typical San Mateo locksmith house call service ranges from $30 to $150. However, it may go as high as $100 to $250 during night services, holidays, and weekends. A normal key duplication costs around $1.50 to $4 but may rise from $3 to $20 for customized keys. Home services for re-key purposes ranges from $40 to %100. On the other hand, lock installation services from a quality San Mateo locksmith costs anywhere between $40 and $100 minimum and not inclusive of the labor charge that ranges from $15 to $40.