绝对不允许，这个你确实违规了。你没有查到不等于没有规定。

来源: 于 2019-10-04 08:46:32 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

no keyed lock, only door handle lock for internal doors. 

Your house is in single family zoning. Having internal keyed lock means your house is multi-family therefore violating zoning.