Architect
noun
You know that 建築 is architecture. So, someone of house architecture is someone who does architecture. They are an architect.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will also help if you know how to read 建築 already.
お父さん、あんたが建築家になったから、鼻が高いのよ。
Dad is very proud of you because you became an architect.
医者は、その建築家をあやまって胃がんだとしんだんしました。
The doctor incorrectly diagnosed the architect with stomach cancer.
私の家は有名な建築家によって設計されたんですよ。
My house was designed by a famous architect.