Customs shown in different house styles (4)
I believe the answer is:
uses
'customs' is the definition.
(use is a kind of custom)
'in different house styles' is the wordplay.
'in' says the answer is hidden in the clue.
'USES' can be found hidden inside 'different house styles'.
'shown' is the link.
(Other definitions for uses that I've seen before include "Operates" , "What an employer does" , "Functions, applications" , "Employs" , "Employments" .)