We had this issue with Cork Co Co after we purchased a serviced site, when we went for planning permission. We asked our architect to contest this, because as far as we were aware the developers had paid this contribution, enabling them to sell the sites as serviced, thankfully they withdrew their request for 17.5K. This was in 2006. Maybe in the current climate developers are not paying all the charges they were at that time, as they've had to reduce the sale price of sites. (afaik the contribution is for esb, water, street lighting that's the point of the contribution)