Chorus says it's confident funding to cover the cost of connecting Ultra Fast Broadband to trickier locations like apartment buildings or down shared driveways will continue.
Residents in such premises have to get permission from all owners before fibre is installed and many find their applications blocked because they cannot get their neighbours' consent.
Chorus chief executive Mark Ratcliffe said a pool of funding agreed between the company and the government to help pay for the extra costs was due to run out.
He told Nine to Noon he was confident the fund would be extended, while a law change would also help speed up the installation process.
"It does two things as I understand it. It divides the things into non-obtrusive, easy-to-do work where notice can be given to the owners there that works coming, this is how it is going to be done and that sort of thing, and then the more complex stuff that might be more invasive has to go through an approval process."
About 35 percent of the properties it runs fibre past are non-standard, requiring permission from all owners.