Information released by the NSW Valuer-General shows in the year to July 1, 2014, Kiama's residential median land value jumped from $305,000 to $334,000 - a whopping 9.51 per cent - making it the most expensive coastal land outside Sydney.

The increase outstripped growth in the popular Byron Shire, on the Far North Coast, which ranked second with a median land value of $328,000.

It came as little surprise to Raine & Horne Kiama agent Terry Rigoni, who attributed the sharp rise to a combination of factors.

"Kiama is a high-demand area with a limited supply of available land and it's in relative proximity to Sydney," Mr Rigoni said.

"The housing demand has certainly increased and land values have followed that [trend]."

The Shoalhaven was among a handful of regional coastal spots - including Bellingen, the Clarence Valley, Eurobodalla and Nambucca council areas - that recorded zero growth over the same 12-month period.

Wollongong recorded the second highest residential median land value for a major non-metropolitan centre at $248,000, behind Newcastle's $255,000.

Real Estate Institute of Australia Illawarra chairman Trever Molenaar said areas like Wollongong and Kiama had benefited from the "massive confidence rise" in the Sydney market in the past 12 months, but would likely experience a lull in growth in the coming year.

"We've seen some massive growth but it won't continue to keep going that way so we expect it to level off," he said.

Residential land values for NSW increased by 13.12 per cent in the year to July 1, 2014, compared to 3.21 per cent the previous year.