A record month for house sales means a lot of money in the market.

Almost 9000 residential properties were sold last month - the biggest March since 2007, before the global financial crisis.

REINZ spokeswoman Colleen Milne says the total value of sales for the month was equally impressive.

"For March was $5.3 billion and if we compare that to March in 2014, it was just over $4 billion."

Colleen Milne says Auckland is to blame for much of that increase, with the median price there increasing more than 80-thousand dollars.