Norton Rose Fulbright and Australia's Henry Davis York will merge this year after partners at both firms voted in favour of a union.

The firms confirmed that they were in late-stage merger talks last week, and they are now planning to combine before the end of the year. According to the official statement, the tie-up was approved by an "overwhelming majority" of partners in both firms.

The combined firm will have around 160 partners in Australia, and offices in Brisbane, Canberra, Melbourne, Perth and Sydney.

Norton Rose global chief executive Peter Martyr said: "There is a sense of real momentum in our global business right now. The combination proposal in Australia with Henry Davis York is occurring as we join forces with premier New-York based firm Chadbourne & Parke and continue to integrate into our business our new colleagues from Vancouver-based firm Bull Housser.

"The addition of Henry Davis York will give us the critical mass we need in Australia to take full advantage of the steps already underway, at a global level, to modernise our business through the implementation of our 2020 business transformation strategy. This combination will allow us to bring the benefits of this transformation to more clients."

Henry Davis York has bases in Canberra, Brisbane and Sydney. The firm consists of 45 partners, 71 special counsel or senior associates, and 63 lawyers. It is a full-service firm with a focus on the financial services, government, infrastructure, healthcare and university sectors.

Norton Rose has more than 600 lawyers in Australia, based in Brisbane, Melbourne, Sydney and Perth, after moving to the market via its 2010 merger with Australian firm Deacons.

Norton Rose Fulbright Australia managing partner Wayne Spanner added: "We were ahead of the pack when we announced our game-changing merger in 2010. We see that the Australian legal market is ripe for the next phase of consolidation and we are satisfied that this combination will bring us another first-mover advantage."

Meanwhile, Norton Rose will merge with US firm Chadbourne & Parke later this year, its second US merger following its deal with Texas-headquartered Fulbright & Jaworski in 2013. Chadbourne expects the proposed union to go live by mid-year.

However, a number of Chadbourne lawyers have opted against the merger, and this week, Covington & Burling announced the hire of a team of 15 Chadbourne lawyers, including two London international partners, after recruiting a four-partner project finance team from the firm earlier this year.