The central executive residence, original building, was built 1792-1800. The east and west porticos were designed by Thomas Jefferson and built in 1803. In 1859 the East Colonnade was dismantled. The East Wing and West Wing were constructed in 1902, and a modified version of the east colonnades was constructed in 1902 on the same foundations of Jefferson's 1803 original.
Layout
References
McKellar, Kenneth, Douglas W. Orr, Edward Martin, et al. Report of the Commission on the Renovation of the Executive Mansion. Commission on the Renovation of the Executive Mansion, Government Printing Office: 1952.
Seale, William. The President's House. White House Historical Association and the National Geographic Society: 1986. ISBN 0-912308-28-1.
Seale, William, The White House: The History of an American Idea. White House Historical Association: 1992, 2001. ISBN 0-912308-85-0.
The White House: An Historic Guide. White House Historical Association and the National Geographic Society: 2001. ISBN 0-912308-79-6.