By William Boston 

Italian sports car maker Lamborghini on Wednesday confirmed plans to build a new sport-utility vehicle in a move to tap global growth in luxury automobiles.

Lamborghini first presented a prototype of the SUV in 2012. The decision to go into production was held up over discussions with its parent company Audi AG, a unit of Volkswagen AG, over design and the costs of building the car in Italy. The new SUV will become available in 2018.

After negotiations with Italian trade unions and the Italian government, Lamborghini won concessions, including tax breaks and other incentives, that allowed it to get the green light from Audi to build the car at its main plant, according to people familiar with the situation.

"The new SUV will be built in Sant'Agata and demonstrates our commitment to protect the values of 'Made in Italy,'" said Stephan Winkelmann, President and Chief Executive of Lamborghini, in a statement.

The company plans to produce 3,000 SUVs a year, doubling Lamborghini's total output, which was about 2,530 cars last year. Lamborghini will nearly double the size of its factory to 150,000 square meters.

Lamborghini follows in the footsteps of other luxury car makers who have sought to get into the higher-volume SUV market with an upscale luxury vehicle.

Sports-car maker Porsche now produces two SUVs, the Cayenne and the Macan, and sells more SUVs than conventional sports cars.

Luxury car maker Bentley, also owned by Volkswagen, plans to begin production of a luxury SUV later this year. And Bentley rival Rolls-Royce has also announced plans to build a luxury SUV.

Although the Lamborghini SUV will be assembled in Sant'Agata, many of its components will come from other factories in Volkswagen's network, including its SUV factory in Bratislava, Slovakia.

The Bratislava plant also builds the chassis and other components for Bentley's SUV, Porsche's Cayenne and Macan, and Volkswagen's Touareg.

Eric Sylvers contributed to this article.

Write to William Boston at william.boston@wsj.com

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