De or het welstandcommissie?

The correct Dutch article is:

de welstandcommissie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use welstandcommissie

the welstandcommissiede welstandcommissie
this welstandcommissiedeze welstandcommissie
that welstandcommissiedie welstandcommissie
our welstandcommissieonze welstandcommissie
your welstandcommissiejouw welstandcommissie
every welstandcommissieelke welstandcommissie
which welstandcommissie?welke welstandcommissie?
a big welstandcommissie / the big welstandcommissieeen grote welstandcommissie, de grote welstandcommissie