Staff will relocate when two major Birmingham legal offices merge to create a top 50 law firm.

Employees at Shakespeares will move from the firm’s Temple Street offices to SGH Martineau’s No 1 Colmore Square headquarters when the deal is complete on June 15.

The new firm, which will have a combined turnover of £75 million and employ 900 people, will be known as Shakespeare Martineau.

It will take over a whole floor of the Colmore Square base, doubling its current size.

Andy Raynor, chief executive at Shakespeares and now Shakespeare Martineau , said: “We were very fortunate space was available within the same building as SGH Martineau on adjacent floors.

“It means we will be able to kit out very quickly and get together virtually from day one.

“The objective is to do that from day one and it looks like we will be able to do that.”

Mr Raynor said the working floors, and a client floor, would total about 45,000 sq ft and added that the building offered a perfect fit as the two offices were similar in size in terms of their Birmingham staff complement.

Emma Shipp, SGH Martineau’s managing partner added: “It is very important for us to get into one office in Birmingham and feel like one firm.”

The combined firm will have offices in Birmingham, Leicester, London, Milton Keynes, Nottingham, Solihull, Stratford-upon-Avon, Sheffield and Brussels.

Mr Raynor added: “We have got very similar client business and found we had got a lot of common clients, though we also found we were doing different things for them.

“By combining the firms it means it is much better for clients – there is a real opportunity with that.

“Shakespeares had to really look at what we could do to establish a longer established business.

“SGH Martineau has real sector specialisms so it is a coming together of attitudes and attributes.

“We are already working jointly on a number of significant clients and it is clear we will be able to make real strides in the way that we service them.”

Shakespeares broke through the £50 million turnover barrier for the first time in 2014, following a period of sustained growth.

Seen as one of the fastest-growing on the country, 2013 saw two mergers, the first with Leicester-based planning specialists Marrons and the second with Stratford/Coventry-based social housing experts Newsome Vaughan.

SGH Martineau, a Birmingham-based firm which also has offices in London and Brussels, posted full-year revenues of £27.5 million and profit of £6.8 million in 2014, which it said “exceeded expectations”.

Profits rose despite a fall in revenues, which the firm said was as a result of specialising in the sectors it is strongest in and a continued drive for efficiency.

Mr Raynor said the merger was designed to spur further growth.

“We are doing this for growth,” he said. “This is two ambitious firms wanting to do more, and do it further and faster.

“It gives us a real licence to talk to potential new clients, talk to existing clients and bring new services.

“More than anything it underlines the fact we are out there to compete. We think there is a changing legal services landscape and we want to be at the forefront of that.”