good to

[azz]

a. This architect is good to design your house, but not to design big buildings,
b. Thus architect is good for designing your house, but not for designing big buildings.

Are the above sentences grammatically correct?
Are they natural?

The idea is that he is good for the task of designing your house, but not good for the task of designing big buildings.


Many thanks

[Erik_Kowal]

Try:

"This architect is good for designing your house, but not [for designing] big buildings."