Two Down?

It very much looks like the second of the seven houses under construction has been completed.  We've also heard on the grapevine that two of the properties have been sold. 

Now forgive us our ignorance as we're not sure how this all works:  the conditions of the planning permission have not yet been fulfilled and yet the houses can be sold?  The conditions in question are that all road construction, street lighting and drainage details have to be approved before work can commence.  This hasn't happened.  There are also a number of other conditions that have to be met before the development is brought into use.  We do hope whoever has bought the houses have got good lawyers.