They can be made larger ok. But most of the suppliers I use would make me sign a disclaimer on any side hung window that is over 1200mm in height.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local