Just a stupid question on the side. Why is your structural engineer doing the thermal protection certificate?!
Statics -> structural stability, thermal protection is insulation or facade builder or energy geek?!
Our structural engineer cost 2400€ gross. About 1000cbm volume, quite a few demanding details in the construction project.
An expert said typically the statics cost is three times that. The good price came about because the structural engineer has been working with our architectural office for a long time. Therefore, I would also orient myself towards the structural engineer your architect knows from previous cooperation. That way, things can also happen quickly through informal channels...