De or het kostenschatting?

The correct Dutch article is:

de kostenschatting

Rule Words ending in -ing: almost always de. See the rule

How to use kostenschatting

the kostenschattingde kostenschatting
this kostenschattingdeze kostenschatting
that kostenschattingdie kostenschatting
our kostenschattingonze kostenschatting
your kostenschattingjouw kostenschatting
every kostenschattingelke kostenschatting
which kostenschatting?welke kostenschatting?
a big kostenschatting / the big kostenschattingeen grote kostenschatting, de grote kostenschatting