Leaders managing director Elanor MacDonald said sea views could add anything from $50,000 to $250,000 to the value of a property.
Values depended on the direction of the view, noise and the location of the section.
"There's a lot to take into account, it's not just the water that matters," said Ms MacDonald.
A sea view could add even more to the value of a Hardinge Rd property on the waterfront.
That was the location of some of the most valuable properties she had seen sell in the past 12 months.
Houses on Waghorne St one street back from the water were also expensive, but less so than on Hardinge Rd.
"It's quite a big jump up just to be on the waterfront versus the street back but they're both expensive and very sought-after."
Ms MacDonald said it wasn't easy to find a seaside house in the region.
"When they come up, they tend to be fought over."
Other sorts of views were in demand, too, particularly in good, sunny locations, she said.
"Some of the Havelock houses that look out over the hill, they're very popular and a view there definitely adds value. Some of those houses look out over towards Napier and out to the ranges and they're more expensive than houses that don't have those views."
In Auckland, buyers were willing to pay nearly 50 per cent more for a view of the water.
The median Homes Estimate for a property with a water view in Auckland is 48 per cent higher than a property with no view. Water view houses in Remuera, Takapuna, Mission Bay and Freeman's Bay had median values that were more than double those with no view.