Hi Larry,

Thanks for reaching out and your interest in LaCantina Doors. The cost of our doors/windows varies depending on size, material type, operating type, etc... However, this article will provide a good ballpark to consider. https://www.lacantinadoors.com/blog/entry/how-much-do-folding-patio-doors-cost

Feel free to complete our request a quote form and we can have someone from a dealer local to you reach out and talk through options and provide more accurate pricing with no obligation. https://bit.ly/lacantina-request-a-quote

Thanks,

LaCantina Marketing

What are the dimensions of one of these panels in this picture?

Good morning! The panels of that door are probably around 3 ft wide each. However, most of our products are custom made so you can get any size you need to fit your project. Feel free to complete our request a quote form and we can have someone from a dealer local to you reach out and talk through options. https://bit.ly/lacantina-request-a-quote