The best way to get your curtains just right is to install your tracks or poles before you measure up for your curtains. Start off by looking at your window to decide where you want your curtains to go. If the window sits in a recess, decide if you want the curtains hanging inside or outside of it. If you're putting your curtains in front or, if your window sits flush to the wall, place your poles and tracks 15cm above the window and extend by 15-20cm either side - this will make space for your curtains to be drawn back. If you're planning to have very full curtains, leave a few centimetres more to allow maximum light into your room.
Measure the width across the top of the window, allowing enough space for your finials (the decorative ends attached to your pole)
If space is tight and there's no room for finials, why not try stud ends or recess brackets? We can also offer you bay window solutions – contact us for more details