The Photographers’ Gallery, which reopens in a revamped central London building next month, is among those arts organisations that auction artists’ work to raise money.

The gallery gained more than £325,000 from an auction held at Christie’s in early 2011, with 70 lots donated by artists, gallery owners, estates and other individuals. Photographers represented included Mario Testino, Helmut Newton and Sebastião Salgado.

The organisation is now near to its £8.9m target for the capital project. It has a range of revenue-raising ideas, such as a Buy a Brick scheme that has raised more than £5,000 and an initiative for people to commission portraits from photographer Bettina von Zwehl, which cost £3,000 each.

Last month the Contemporary Arts Society (CAS) raised more than £260,000 through its annual auction. Among the artists represented were Paula Rego and Jim Lambie. The society commissioned 44 lots and the amount raised beat last year’s total by £20,000. The money will help CAS member museums and galleries buy and commission contemporary art.

The Whitechapel Gallery in east London also held an auction last month, which included works by Jake and Dinos Chapman, Martin Creed and Mona Hatoum. The evening raised £355,000.

Charities also benefit from auctions of artists’ work. An exhibition at London’s Somerset House until 22 April includes work by Tracey Emin, Antony Gormley, Yinka Shonibare and Gillian Wearing. The works will be auctioned at Christie’s on 3 May to raise money for the homeless charity Crisis.