What I would like to have on this page eventually is some actual properties so that you can get a good idea of what is available in and around Porto Heli in the way of plots of land or second/holiday homes. I'm also working on links to construction company sites and/or their contact details. So, in the meantime, take a look at these few links.
A real estate company I can personally recommend is: www.realestate-koilada.gr, owned by a friend of mine and there are a couple more in Porto Heli that don't have websites yet.

Tools of the trade.
I am not responsible for the information on any websites I link to from this page, be it accurate or inaccurate. Unless I expressly say so, I have no personal experience with either the company personnel or the properties, I merely gathered up various links and put them all in one place. I do get alot of e-mails asking about buying real estate in Porto Heli and my advice is ALWAYS to live here for 6 months or visit for a few weeks at least 3 times in a year before making a final decision, get to know the place and the people a bit.