Ambassador David Manning held a reception earlier this week to formally hand over the 64 drawings of the building ( pictured), which is the only example of Lutyens' work in the US.
Speaking at the event, which was attended by RIBA president Jack Pringle, Manning described Lutyens as 'arguably the greatest British architect of the 20th century'.
He went on to say that the Embassy residence is 'an architectural jewel, and one of the most striking diplomatic buildings in the world'.
He added that 'donating these remarkable drawings to the British Architectural Library is the best way of ensuring their conservation and wide accessibility'.
Lutyens was commissioned to work on the design in 1925, when he visited Washington to receive the Gold Medal of the American Institute of Architects.
A start on the working drawings was authorised in 1926 and construction began on the site on Massachusetts Avenue in 1928.
The work was completed in 1931.