During the Ascot races and Windsor Horse Show, reservations are necessary far in advance. Unlike such towns as Oxford, you will find a not-so-great collection of B&Bs in Windsor. In a pinch, the Tourist Information Centre will book you into budget accommodations in the area but will charge £5 for doing so, plus a 10% deposit.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.