Quite so, niche fabricated houses (5,4)
I believe the answer is:
every inch
'quite' is the definition.
'so niche fabricated houses' is the wordplay.
'so' becomes 'very' (I've seen this before).
'fabricated' is an anagram indicator.
'houses' is an insertion indicator.
'niche' with letters rearranged gives 'einch'.
'very' placed within 'einch' is 'EVERY INCH'.
(Other definitions for every inch that I've seen before include "Entirely" , "Wholly" , "Thoroughly" , "Absolutely!" , "In all departments" .)