Is my solicitor overcharging me ?

Greetings.

I am in the final stages of selling my apartment and hope to purchase a house in a few days. My question is whether my solicitor might be overcharging me. He represented me when I bought my apartment four years ago, so I assumed it would be simpler and cheaper to use the same solicitor. He has requested €10,000 for his services in selling my apartment and buying a house concurrently. This seems excessive; what is your opinion? Also, since he began representing me five months ago, he has not issued me with Letter of engagement Section 150 

Thank you.