How many years you have to work for to buy a new normal house ??
A difficult question to answer.
First, here in the US, new houses are usually cheaper. In a tract or subdivision a new house usually requires that the home owners install fences and landscaping mostly at the home owner's cost.
I can only explain my experience. I worked in the factory bringing newly built computers up and running. Trouble shooting, finding defective circuit boards and wiring errors. (ca. 1965-1970) From there I went to Operating Software Programming and then Telephony switching systems. (APZ-130 / ETS4 if you know) Then field marketing support and finally a network engineer helping to build the Internet.
~ The first house, new, Phoenix Arizona about 2¼ times annual salary.
~ Second house, new, Delaware Ohio (near Columbus) about 3 times annual salary.
~ Third house, previously lived in, near Pittsburgh Pennsylvania about 3 times annual salary.
~ Fourth house, previously lived in, near Los Angeles California about 3½ times annual salary.
~ I'm currently living in the fourth house but retired. This house value is about 5 to 6 times my retiring annual salary. Although, because the company calculated my severance package as a commissioned sales representative, the house value is about 3½ times my then annual salary.