Between 1794 and 1824 Soane remodelled and extended the house into two neighbouring properties – partly to experiment with architectural ideas, and partly to house his growing collection of antiquities and architectural salvage.
As his practice prospered, Soane was able to collect objects worthy of the British Museum, including the Sarcophagus of Seti I in 1824.

After the Seti sarcophagus arrived at his house in March 1825, Soane held a three-day party, to which 890 people were invited, the basement where the sarcophagus was housed was lit by over one hundred lamps and candelabra, refreshments were laid on and the exterior of the house was hung with lamps.
Among the guests were the Prime Minister Robert Jenkinson, 2nd Earl of Liverpool, and his wife; Robert Peel, Prince Augustus Frederick, Duke of Sussex, Samuel Taylor Coleridge, J.M.W. Turner, Sir Thomas Lawrence, Charles Long, 1st Baron Farnborough, Benjamin Haydon as well as many foreign dignitaries.

He also bought Greek and Roman bronzes, cinerary urns, fragments of Roman mosaics, Greek vases many displayed above the bookcases in the library, Greek and Roman busts, heads from statues and fragments of sculpture and architectural decoration, examples of Roman glass.
Medieval objects include: architectural fragments, tiles and stained glass.
Soane acquired 18th century Chinese ceramics as well as Peruvian pottery.
Soane also purchased four Indian ivory chairs and a table.
Between 1794 and 1824 Soane remodelled and extended the house into two neighbouring properties – partly to experiment with architectural ideas, and partly to house his growing collection of antiquities and architectural salvage. As his practice prospered, Soane was able to collect objects worthy of the British Museum, including the Sarcophagus of Seti I in 1824.
After the Seti sarcophagus arrived at his house in March 1825, Soane held a three-day party, to which 890 people were invited, the basement where the sarcophagus was housed was lit by over one hundred lamps and candelabra, refreshments were laid on and the exterior of the house was hung with lamps. Among the guests were the Prime Minister Robert Jenkinson, 2nd Earl of Liverpool, and his wife; Robert Peel, Prince Augustus Frederick, Duke of Sussex, Samuel Taylor Coleridge, J.M.W. Turner, Sir Thomas Lawrence, Charles Long, 1st Baron Farnborough, Benjamin Haydon as well as many foreign dignitaries.
He also bought Greek and Roman bronzes, cinerary urns, fragments of Roman mosaics, Greek vases many displayed above the bookcases in the library, Greek and Roman busts, heads from statues and fragments of sculpture and architectural decoration, examples of Roman glass. Medieval objects include: architectural fragments, tiles and stained glass. Soane acquired 18th century Chinese ceramics as well as Peruvian pottery. Soane also purchased four Indian ivory chairs and a table.
John Soane