Aryan's father, Dr Anjan Banerjee, said their family was pleased Aryan had been vindicated through the report.
It showed it was not the 9-year-old's actions, but the "environment at the school that led to his death".
When asked if the report would help bring his family more closure, Dr Banerjee said he was not sure yet.
"It's too much to take in at once."
However Taradale Primary School Board of Trustees chairman Steve Alexander said they disagreed with the findings that the tragedy was foreseeable.
Mr Alexander said the school's thoughts and "deepest sympathies" were with the Banerjee family, but would not be commenting on the report.
"But we do continue to agree with the recent findings of WorkSafe New Zealand," he said.
"Their investigation found the tragic consequences of the caretaker's actions were not foreseeable."
He said the school would not be commenting further.
In his report, the coroner stated the school caretaker - whose name is suppressed - was conducting what he thought was urgent maintenance on the toilet door, in May last year.
While repairing the lock, he returned to his workshop for what he said was three to five minutes, and left the block unattended, with the toilet door open, and mechanism incomplete for a period of time.
During this time, Aryan had gone to the toilet. When he realised he was "effectively trapped" he decided to climb out the window to get out.
Mr Scott disputed the urgency of the maintenance, and said the caretaker could have taken measures to block the toilet off - such as placing an out of order sign on the door, or blocking the door with available cones and tape.
The caretaker also could have informed the teacher of Aryan's class of the situation because those students used that toilet.
Under these circumstances the coroner stated it was "quite foreseeable" someone would become trapped in the toilet, adding this had happened on two previous occasions - one involving the principal's child.
He added it was also "entirely foreseeable" that a child would try to exit the toilet in the way Aryan had, after attempting to attract attention.
In his report, Mr Scott noted there was a difference of opinion about the incident between himselfand the outcome of a WorkSafe investigation.
WorkSafe chief inspector Keith Stewart stated their investigation concluded there had not been a breach of the Health and Safety in Employment Act 1992 in respect of Aryan's death, and that no enforcement action was possible.
The coroner had considered the evidence put before him under a different act - the Coroner's Act 2006 - and had reached his conclusions, Mr Stewart said.
In his report Mr Scott also recommended that all school toilets should have stall-type doors, with a gap at the bottom, and windows that can fully open.
While Ministry of Education deputy secretary Jerome Sheppard said they would be taking up the coroner's suggestion to provide the findings to all schools, it appeared unlikely they would be implemented.
Mr Sheppard said the ministry would revisit their design guidance to see whether changes should be made in light of the report.
He said all buildings had to comply with Building Code requirements - which some of the coroner's recommendations would be inconsistent with.
"The ministry's current design guidance, which we strongly recommend that boards follow, recognises the benefits of schools using self-contained cubicles - including the minimisation of anti-social behaviour and because they can be used as unisex toilets," Mr Sheppard said.