Turkish vernacular housing architecture is in danger of extinction. Original village patterns deteriorate due to new developments, which are discordant with existing settlements and social lifestyle. This paper claims to ensure the cultural continuity of Turkish vernacular housing architecture by adapting new residential designs to the existent environment with a parametric shape grammar method. Originally, vernacular house plans included the allocation of space around a hall: a Sofa. This study firstly exposes spatial organization and grammar rule sets according to the relation between the sofa and remaining spaces, secondly considers current physical problems and villagers' contemporary living demands and finally creates design solutions coherent with the actual vernacular character by adapting a new design grammar to the existing design.