I am a professional seamstress, specializing in home decor projects, ranging from draperies to balloon and Roman shades, and bedding from simple pillows to ornate duvet covers.
I base my price estimates on the size of the window or finished project. I try to stay within my estimates, and will inform you of any speed bumps that occur.
Sometimes, the fabric type will change the original estimate, i.e. velvet is very difficult to work with and would require more time.