What conclusions have I jumped to richy ? I'm only going on what info you have supplied, a forecast is just that, in reality it means nothing, especially over a short period, you can only measure growth and then forecast over at least a years figures, if not 2 years, on a short range forecast such as yours are you taking into account the extra vehicles, staff, and logistical problems that arise, let alone seasonal effects on window cleaning ?
Sorry if another point of view has rattled your cage
Darran