Service Care Solutions has taken a further 1,500 sq ft of space at Hurstwood's Marshall House in Preston, one of four deals this year.
The recruitment agency now occupies 4,000 sq ft of space across two floor of the building.
This is the fourth deal Hurstwood has completed at Marshall House this year following three lettings in the new fifth floor business centre to Lawyers (UK), IM Bookkeeping and LGEC.
Richard Freye, managing director of Service Care Solutions, said: "Service Care Solutions has worked with Hurstwood since 2009.
"We have expanded significantly since our arrival into Marshall House and now occupy two floors.
"The office space that we have expanded into is used by our team to obtain hard to find candidates for specialist social care and legal roles across the North of England.
"This expansion facilitated by Hurstwood will enable us to recruit an additional 20 staff over the next two years."