In a letter to long-suffering residents, the NSW Government says the work will start in mid-May and will take up to three months to complete, depending on weather.

Two noise reduction barriers will be constructed near Windsor Drive and Huntingdale Park Road, south of Berry.

Not long after the $580 million Berry Bypass was opened to traffic in July 2017 residents in that area have complained of increased noise from the road.

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Many south Berry residents saying the noise in their homes was "unbearable", with residents, particularly from Windsor Drive undertaking a campaign to get some relief.

This latest letter to residents said site inspection and survey works and confirmation of utilities to help inform the final design of the noise barriers was completed last October/November.

"We are now finalising the design to ensure they align with the look and feel of the Berry village," the letter said.

Kiama MP Gareth Ward announced in October last year local company GC Civil had been awarded the contract to build the Berry structures.

At the time it was hoped work would start in early 2021.

It is understood the Berry structures will run for around 300 metres on both sides of the highway, south of the Kangaroo Valley Road overpass and will be included in the mounded areas that already exist on either side of the bypass.

On the Windsor Drive side, the structure will be around four and a half metres off the ground, while on the Huntingdale Park Road side, which is already considerably higher, the structures will be around six and a half metres high.

The NSW Government committed $5.3 million towards two noise barriers projects at Berry and further work near Coryule Place at Kiama.

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