Jollyman, i must say that the fee you paid your engineer are not realistic whatsoever. You say he was a friend of yours so that explains it.
To the OP. I would definately suggest, what ever road you go down, to price around. If you want to have an artistically design contemporary dwelling then seek out RIAI architects, you will obviously pay top dollar for these services... ie probably 2 % of projected construction costs for 'design' sketch drawings (NOT CONSTRUCTION).. so assuming 3000 sq ft at 120-125 euros per sq ft would equate to approx €7,000...... if you want a full package from an RIAI architect ie from concept to certification youre probably taking more along the lines of 5-6%... ie €20,000.... these prices may seem big but the services and end product are definately worth it...
however if you want a more traditional, more simple and straigh forward dwelling i would recommend pricing other professionals such as Architectural technician, or engineer firms that employ architects or technicians.... these firms do not charge to riai sugested rates......
but again, in order to get a clear true price you need to know for certain what services you want.....