A £350m expansion of Aberdeen harbour is set to go ahead after six years of planning.

The extension of the port into neighbouring Nigg Bay is expected to be completed by 2020 and will include new facilities cruise ships and North Sea decommissioning.

They will contribute £1bn to the economy every year by 2035 and create jobs, according to Scottish Enterprise.

Colin Parker, chief executive of Aberdeen Harbour Board, said: "We are delighted that after six years of detailed planning and extensive consultation with our many stakeholders and the regulatory authorities we are now in a position to approve commencement of construction.

"Following a detailed engagement process, Aberdeen Harbour Board, in partnership with Dragados UK, a main contractor, will develop facilities over the next three years that will represent a step change in the marine support capabilities in Scotland.

"These will transform the port's ability to accommodate the trend for larger vessels we are witnessing across a whole range of industries."

Mr Parker added: "The expansion will afford existing customers the opportunity to diversify and expand their interests, whilst attracting new customers and markets to the port, including up-scaled decommissioning activity, a more significant share of the available cruise vessel fleet and larger more cost-effective commercial vessels."

The new facilities will include 1400m of new quay and 125,000 square metres of extra laydown space.

Transport minister Humza Yousaf said: "This is excellent news for Aberdeen and the Scottish maritime industry as the signing of the construction contract means this nationally significant project can now get under way in earnest.

"The significant investment will bring jobs and business to Aberdeen, supporting the local and national economy."