Google Maps API Linked to DB

We need a custom website/DB creating (preferably PHP/MySQL) to track specific information about places in the UK. The website will need a login and then provide the ability for a user to draw a polygon over an area of land (Workpack). This polygon is saved in a DB and referenced WP0001 for example. Information about the pack can be added and tracked such as address, number of properties, status level, users comments etc. Users can then add specific points/polygons to the workpack on the map (buildings) and add information about each building e.g. name, address, status, notes etc). When the users draws a polygon it needs to capture the area in m2. We then need the ability to export this information to csv either ALL work packs or Building Export.

We need this quickly and will provide full details, project brief, GUI's to successful candidate. Please note you need to provide evidence of your ability to work with the google maps API to be accepted.