As mentioned above the Chairperson does not have any more authority than any other committee member in any decision making, including a decision to take on maintenance roles.
There are lots of questions …….. Is the maintenance contract at your BC something that is agreed to each financial year at the AGM? If so then you can propose a Motion at the AGM that the remuneration of the maintenance contract be reduced to reflect the fact that some of the jobs are now not required.
What maintenance jobs is the Chairperson undertaking that were previously covered by the maintenance contract – gardening? sweeping? putting out the bins? Who is doing these jobs when (and if) the Chairperson becomes ill or is on holiday?
Is it on the record that the Committee has approved the Chairperson taking on some of the maintenance? Is the Chairperson being paid to undertake this work? What are the insurance implication? Is there a conflict of interest?