Margaret Hodge, the PAC's chairman, criticised the Treasury for failing to be more actively involved in reviewing the household's financial planning and management, including in the plans to maintain historical buildings.
A Treasury spokesman said: "The new arrangements established by the Sovereign Grant Act have made the royal finances more transparent than ever while providing the long term stability necessary for good planning.
The PAC's report has failed to properly account for these changes."
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A top temperature of 9 or 10 Celsius (48-50 F).
Jobs with decent pay and flexibility are "few and far between" for single parents who are the main earner and carer, said the report.