Based on the dimensions and the all the extra requirements you provide us, we will provide you with a quote. If you would like to go ahead we will request a 50% deposit at the time of arranging the templating visit. Once templating is completed, the final price will be confirmed. Generally, it will only change from original quote if the dimensions vary from those used in your initial estimate or if you change the colour or extras you want. The remaining balance is due on the day of installation via debit or credit card.