The Fundraising Standards Board is examining the causes of public concern about telephone and door-to-door fundraising and household collections after a rise in the number of complaints about these forms of fundraising.
The fundraising regulator has asked its members to provide additional information about the cause of complaints in connection with the three methods as part of its annual complaints return.
Charity members of the FRSB must complete the annual return, which includes details of their fundraising activity and complaints received during 2013, by 10 March.
The FRSB Complaints Report 2013, published last June and based on complaints received by its members in 2012, said the number of complaints about doorstep fundraising had increased by 93 per cent to 5,555 compared with 2011.
Telephone fundraising was the second most complained-about fundraising method and was the subject of 6,379 complaints, an increase of 64 per cent on 2011.
Complaints about household collections increased by 85 per cent to 1,910 over the period, making it the fourth most complained-about method.
Alistair McLean, chief executive of the FRSB, said: "This year, we are taking a closer look at complaints about telephone fundraising, door-to-door and household collections, which have been on the rise in recent years.
"We are keen to determine whether this increase has continued throughout 2013, if any change is proportionate to the volume of fundraising activity and what issues the public is most concerned about."