Upgrade Existing Website

Hi. I need design of my website to be upgraded without changing the URL (as it is important for SEO purpose). I want on the designed to be modernise and responsive. Everything else (navigation, content etc) will remain same. Please suggest a lowest price and deadline by which you will be able to complete this project. Website: [login to view URL] Work: To modernize design (including responsive) Condition: URL must remain same. Ideally only home page and one inner page has to be designed. Rest of the pages will fit into the design. Please put "Only Design" in the beginning of your proposal so that I understand that you have read the entire description. Thank you.