I have been involved with many listed buildings. Here are a few samples.
Crab Tree Farm, Ley Hill (below)
The extension is the portion on the left (first photo below). Render and reclaimed tiles helped the new works to blend in with the old.
The Old Weathercock, Great Missenden (below)
New office with bedroom over. The original house is Georgian, the projecting bay is Victorian, and the portion to the far right is 1990's.
Lych Gate St. John the Baptist Church, Cookham Dean (below)
I designed this in the 1980s when I worked for James Smith Associates, Maidenhead. This project won a conservation award.