"Hiding and stalking in the house and hiding in the stairs is the absolute extreme end."
The man had a history of domestic violence. A month earlier, when they ended the relationship, police had barred the man from the woman's house after he arrived and lashed out at her.
The woman, who is five months pregnant with the offender's baby, told the Dominion Post she did not think her ex would have hurt her and she didn't believe he had been hiding for very long.
Henare said it was unfortunate the man did not get a very "significant" sentence and would probably be out of jail in about 18 months.
Kerrie Pihema, a private investigator who specialises in relationship investigations, said there had been a dramatic increase in stalking crimes.
"This whole area of stalking has added another dimension to private in-vestigators."
Pihema said in the Lower Hutt case, the crime had clearly been orchestrated.
"You can see there has been a lot of time and effort put into observing the ex-partner."
She said the services she and her team had been asked for had changed dramatically over the past 10 years.
"Bug sweeping, which is part and parcel of somebody thinking they are being stalked electronically; GPS tracking, to see if their vehicles are being tracked. We never used to be asked for those services." She also searched computers to look for spyware.
"If someone suspects that their ex-partner is coming around to the house in the evenings or on the weekends or at night, we'll put a surveillance team in and then we'll put an affidavit in for court."