Auction House, which works with estate agents in a network of 40 salerooms, has reported a record July.
It offered 592 lots, and sold 458, to raise £51.8m.
The results for 2019 so far sit at 2,195 lots sold, which is nearly 8% ahead of the whole of last year.
Founding director Roger Lake said: “Once again, our model is delivering well in a marketplace best described as struggling rather than stable, variable rather than consistent, and extremely price sensitive.”
Lake, who said that Brexit does not seem to have affected the auctions market, has 24 auction sales lined up for next month.