Charitable trusts endowed by the late Simon Sainsbury and Paul Getty are giving $2.2 million to the Sir John Soane’s Museum, bringing the London attraction closer to its $12 million fund-raising goal after the British lottery refused a grant request.

The Monument Trust, funded by Sainsbury, has pledged $2 million toward the museum’s planned revamp, which would open up rooms and boost visitor access, the museum said in a release issued for a press presentation. The J. Paul Getty Jr. Charitable Trust has given $200,000 for stained-glass refurbishment.

“It may not be large and trendy, but this most British and eccentric of all house museums has a special place in the hearts of all who know it,” the Soane’s director, Tim Knox, said in the press release. “We still need help.”

The plan is to open the Soane’s bedrooms to the public and set up a coatroom, shop, and revamped exhibition galleries. That would allow a 25% increase in the museum’s 93,000 annual visitors.

The Heritage Lottery Fund, which committed $320 million to the 2012 London Olympics, rejected a $6 million grant request from the Soane in June. In the past month, the museum has raised a total of $3.2 million, including from the Sainsbury and Getty trusts. More than $8 million are still required.

The house at 13 Lincoln’s Inn Fields is exactly as Soane left it in 1837, down to the last footstool. The museum is composed of the main house and two others on either side, all by Soane. At present, visitors squeeze in and out, 50 at a time, through the atmospherically dim 19th-century entrance.

Soane was architect of the original Bank of England building and of the Dulwich Picture Gallery as well as a Royal Academy architecture professor. The house — a small maze of rooms with lunettes, concave mirrors, and skylights — has treasures worthy of the Louvre: the engraved sarcophagus of Egyptian Pharaoh Seti I, Hogarth’s “A Rake’s Progress” series of paintings, and pictures by Canaletto.

When he died a widower in 1837, estranged from his only surviving son, Soane ordered that his house be kept as it was, and opened free of charge to visitors and researchers. Trustees have respected that demand.

Under the new plan, staff offices would be moved over to the restored no. 14, a longtime law office bought by the museum for about $1.4 million a decade ago.

In recent years, Soane’s museum has received about $2.5 million in British lottery money for buying no. 14 and restoring the three courtyards. Another $58,000 were given last August to help the museum draw up plans for the revamp.