Dear Paulron,
We would need a bit more of information.
As Maria says, the issue of the certificate should be free, but maybe your Solicitor has quoted you a fee for something different.
I will explain myself. If your property is second hand, or an old house, or a new construction built by an individual, and there is no certificate in place; it may be that the Lawyer needs an Architect to produce a report on the house, then pay Architects fees and fees for the Architect School, etc.
This is quite common in old town house in Alicante region.
I hope this helps.
Kind regards,