Tauranga's average weekly after-tax pay for first-home buyers was $758.14 - up from $756.18 in March last year.
According to latest Real Estate Institute of New Zealand figures, the median house price in Tauranga rose $11,000 to $388,000 in the month to March.
Tauranga's Rapson Loans and Finance mortgage broker Chris Rapson said he advised clients who might have "tight" repayments to fix their home loans in the medium term.
"I think it's a pretty sad day for the New Zealand borrower. I just think the economy in New Zealand is not as strong as the economists would have us believe. For people who are outside Christchurch or Auckland, or who are not dairy farmers, life is hard."
Mr Rapson said the Bay's high unemployment rate and large numbers of seasonal workers or casual port workers meant many homeowners faced continuous financial instability.
Based on a $300,000 mortgage, homeowners could expect to pay about $30 more a week following the March and April rises.
Meanwhile, Grey Power Tauranga president Christina Humphreys said a rise in interest rates would be positive for the city's older residents who no longer had a mortgage but had savings in the bank.
She had children who had mortgages, as many elderly people would, but did not believe the rise would be too much of a problem. "Our age group never got less than 9 per cent. Usually it's 14 per cent. When I nearly went broke it was 24 per cent. I think people have got to be very wary whatever rate it is."