Existing external doors were standard 1970s multi-pane single-glazed  units in standard sizes, with the door frames packed out to suit. The original upstairs hay loft door had been largely filled in and replaced with a small modern window. We researched the form of how the original doors would have been, using old documents and surviving period doors from similar properties, and designed new, highly insulated oak replacements that echoed the original forms and sizes, with inset double-glazing following the original planking.  One door and the newly restored hay loft door were provided with oak-framed full size windows.  We are planning to replace the existing stable doors in similar fashion. Internal pine doors were removed and replaced with solid oak doors of similar design to the external doors, with the exception of the study/library area where we have installed glazed double sliding oak doors – these retract completely into the wall at need.