As José says the likelihood is that it is an "outhouse".

However, the word "cloghouse" appears in an entry here from the Netherlands, obviously a reference to where "clogs" may be stored:

Villa in Hippolytushoef (Netherlands) - Campaya
http://www.campaya.com/ihnl1777.500.1
Please note:
Non-smoking house. In this unique themed house, over more than 100 years of existance, you´re going back to the old days. The beds consist's of 2 typical Dutch cupboard beds. There is 1 antique cot at the end of the cupboard bed. The shower and toilet are in the **** ´cloghouse´. ****There is NO microwave, bathtub and washing machine. Outside you can do the laundry in a laundry tub and let it dry on the bleaching field. Above is an attic with antique items and hanging nets to dry. There are chickens around the house.