There is no charge to give a quotation. The number of visits made during the year will depend on the risk of infestation from the various types of pest.
For example, a farm would be considered high risk for both rats and mice, so a monthly visit would be recommended. A pub would generally be considered low risk so a quarterly visit would be enough.
In some cases a contract will have to be taken out in order to comply with regulations and recommendations from various inspectorates. When this is the case, a minimum number of visits may be specified, regardless of risk.