Volumes increased by 20% on February 2015 and by more than 10% on March 2014.
Marcus Radcliffe, chief executive of Gateway Surveyors, said: “We have experienced strong volumes from our building society panel management clients, coupled with new business driven as a direct result of our new ownership.
“Buy-to-let remains strong, but we have also seen an improvement in first-time buyers and look forward to further growth in these key areas.
“The quality of our reporting, coupled with the efficient turnaround delivered by our in-house surveyors, Sonas, and our Gateway panel, continues to position us favourably in the market.
“We will continue to invest in more surveyors to ensure capacity is available for our clients”.
Martin Reynolds, CEO of SimplyBiz Mortgages, added: “Since Gateway joined the SimplyBiz Group, we have seen renewed interest from lenders across all product sectors.
“March’s figures are very encouraging and show a market that is still very buoyant.
“We believe that, whilst still challenging in certain areas, the spread of valuation work undertaken shows the competition and desire for business from lenders is strong.”