Planning permission has been refused for Portwest to construct their new global headquarters in Westport.

An Bord Plenala has upheld an appeal lodged against the decision of Mayo County Council to grant permission for the office building and café at Roman Island at The Quay in Westport.

The Board says the proposed development is in an area which is at risk of flooding

This is a major set-back for the clothing workwear company, which has seen a massive global expansion in recent years, and now employs over 3,000 people worldwide.

Just over a year ago, Mayo County Council granted planning permission, with 37 conditions, to Portwest Ltd to build their new global headquarters at Roman Island, The Quay, Westport.

The company was planning to construct a mainly 4-storey building with offices, cafe and parking, with plans to employ up to 150 people at the new facility.

Last October, two appeals were lodged with An Bord Pleanala against the council's decision to grant permission.

The appeals were signed by over 20 local residents in total, and cited concerns in relation to flooding, parking, traffic, and the design of the building.

A decision was expected in April, but was deferred due to a backlog in cases.

This week, An Bord Pleanala has upheld an appeal against the decision to grant planning permission to Portwest Ltd.

In reaching its decision, the Board overturned the recommendation of its own inspector.

In a statement to Midwest News, Mayo County Council says this is an unfortunate outcome, after a long and extensive process.

The Council says it will preclude the development of an iconic 21st century building at the Quay, which would have involved a multi-million euro investment and would have bought significant employment and economic activity to the area on a year-round basis.