SDL Auctions raised £20.7m in sales and sold 170 properties in July.
After the stamp duty holiday was introduced buyers have saved nearly £75,000 on the tax collectively.
Andrew Parker, auctioneer and managing director at SDL Auctions, said: “This live-streamed national property auction was a fitting finale to another highly successful month for our sellers taking us to more than £75m raised in lockdown so far.
“Buyer interest remained high with hundreds of buyers registered to place their bid and thousands more watching our live video feed on our website.
“What’s also particularly pleasing is to see that we’ve helped save our buyers £74,930 in tax for our buyers thanks to the Chancellor’s stamp duty holiday.”
Sales were achieved from across the whole of the UK, including properties as far north as Cumbernauld in Scotland and as far south as Plymouth.
There were residential sales in Leicester, Derby, Nottinghamshire and Birmingham (pictured), as well as commercial sales in Dudley.