May one attach a Mezuzah to a door on Chol Hamoed?<a href="#_ftn1" name="_ftnref1">[1]</a>
Yes.<a href="#_ftn2" name="_ftnref2">[2]</a>
<a href="#_ftnref1" name="_ftn1">[1]</a> See
<a href="#_ftnref2" name="_ftn2">[2]</a> The reason: It is permitted to do so as it is the need of Mitzvah and is a Maaseh Hedyot.

Shulchan Aruch HaRav | May one attach a Mezuzah to a door on Chol Hamoed?

May one attach a Mezuzah to a door on Chol Hamoed?[1] Yes.[2] [1] See [2] The reason: It is permitted to do so as it is the need of Mitzvah and is a Maaseh Hedyot.