Cost of Home Improvement for Your Bay Window This one - check out the picture window with the side windows only with mullions. I have been a construction contractor for over 15 can forgo the added cost of the cable to support the bay window - all of these play an important role in your home improvement budget. It is a trio of the best of the best - the bay window with 11 windows we choose to have only 4 of the 11 windows operational. If you are patient, do your research your project will surely be a great success - offering improvements can raise the value of a home flat finish paint wooster