Soane's design for a farmhouse and out buildings has a direct simplicity. Built of stone and with a tiled roof, the well detailed drawings were sent to Scotland to be carried out by a local builder though 'in execution the layout was adapted to take account of the steeply falling gradient of the land-. (P. Dean, Sir John Soane and the country estate, 1999, p.188). Soane was paid '£26 5s 0d for "drawings for the workmen", the bill being settled in 1818' P.Dean op.cit).
The location for the farmhouse and out buildings is sometimes given as Methven but the Royal Commission on the Ancient and Historical Monuments of Scotland web site shows 'Pitmurthly Farm' on its map and the plan (allowing for modern additions) corresponds with Soane's plan catalogued here. Pitmurthly is about four mile north-west of Perth.
(RCAHMS reference is : http://canmoremapping.rcahms.gov.uk/index.php?action=do_advanced&idnumlink=108398)
Sir John Soane's collection includes some 30,000 architectural, design and topographical drawings which is a very important resource for scholars worldwide. His was the first architect’s collection to attempt to preserve the best in design for the architectural profession in the future, and it did so by assembling as exemplars surviving drawings by great Renaissance masters and by the leading architects in Britain in the 17th and 18th centuries and his near contemporaries such as Sir William Chambers, Robert Adam and George Dance the Younger. These drawings sit side by side with 9,000 drawings in Soane’s own hand or those of the pupils in his office, covering his early work as a student, his time in Italy and the drawings produced in the course of his architectural practice from 1780 until the 1830s.
Browse (via the vertical menu to the left) and search results for Drawings include a mixture of Concise catalogue records – drawn from an outline list of the collection – and fuller records where drawings have been catalogued in more detail (an ongoing process).
Contents of Pitmurthly, Perthshire: working drawings for a farmhouse and out buildings for Colonel Thomas Graham, later 1st Lord Lynedoch, 1798 (10)
-  Working drawing for plan of farmhouse with outbuildings
-  Working drawing for elevations of farmhouse
-  Working drawing for roofs of out buildings
-  Working drawing for ground floor of farmhouse
-  Working drawing for plan of first floor
-  Working drawing for plan of first floor (as drawing )
-  Working drawing for cross section and (verso) detail of roof truss
-  Working drawing for longitudinal section
-  Unfinished copy of drawing 
-  Unfinished copy of drawing