Auckland could face a shortage of teachers, paramedics and other essential staff if the city's house prices continue to rise beyond their means.

Already schools in the city are struggling to fill staffing gaps, or even find relievers on a daily basis. Other services expect staffing levels could follow suit if nothing changes.

The Auckland Principals Association's June survey found 220 vacant positions across 168 of the 240 Auckland schools that responded to the survey. The association said there were 480 schools in the city.

President Diane Manners said the housing crisis was affecting mid-career teachers the most. "Once they hit the five- to eight-year band, decide to start a family and look to purchase a house we are losing them to either the outer peripherals of the city or to other parts of the country.

"It's extremely difficult to attract people to Auckland. Salaries aren't going to position them in the market."

May Road School principal Lynda Stuart said fellow principals had noticed a marked increase in the difficulty of recruiting teachers even in just the past three or four months.

"They're also struggling to get relievers because relievers are now taking fulltime positions," she said.

Schools unable to fill vacant roles were merging classes, having teachers share workloads and had members of the leadership team looking at going back into full-time teaching.

The Ministry of Education's acting head of early learning and student achievement Karl Le Quesne said there were a number of strategies to address the shortage, including recruitment drives to bring Kiwi teachers back from overseas.

"We've been meeting regularly with Auckland principals and other education leaders to keep them updated on this work, and to develop further solutions."

The New Zealand Ambulance Association chairman Mark Quin said there wasn't a shortage of paramedics in Auckland yet, but believed this could change.

"Whether you live in Auckland or Invercargill the salary of a paramedic is the same, so obviously with the cost of living, cost of a mortgage, one would be better off in Invercargill or similar on the same sort of wage."

Green Party co-leader James Shaw said it was becoming "completely unaffordable for the people who make our communities function to live in our country's biggest city".

He said when the median house price is almost 15 times the annual income of teachers, nurses and police officers, it wasn't surprising they'd look to buy outside of the city.

As of June 2016 REINZ data put the median Auckland house price at $821,000.

The salary range for teachers was between $46,000 to $72,000, for nurses it was $47,000 to $64,000 (1-5 years' experience), paramedics $58,000 to $72,000 and police officers (1-4 years' experience), $53,000 to $58,000.

However, Police National Headquarters said it hadn't noticed any issue with staffing as a result of Auckland's housing market.

"The number of constabulary employees in the Auckland region is at full strength, with more recruits due to be posted to the Auckland region on graduation."

The salary range for teachers was between $46,000 to $72,000.

The numbers

Teacher shortage Auckland schools, out of 240 respondents, needed new staff for term three vacancies at the time of the survey schools [48.2 per cent] of 245 respondents struggled to get daily relievers

Auckland house prices [according to REINZ]

At June 2016 median house price $821,000

Salaries

Teachers

$46,000 to $72,000

Nurses

$47,000 to $64,000 [ with 1 - 5 years experience]

Police

$53,000 to $58,000 [with 1 - 4 years experience]

Paramedics

$58,000 to $72,000

Salary figures obtained from careers.govt.nz