Aesthetic value: we may value historic assets for their visual qualities, whether they result from conscious design and craftsmanship, or from the fortuitous effect of change over time.
Weithiau bydd angen i ni wneud newidiadau i asedau hanesyddol i gyflawni amcanion amgylcheddol, cymdeithasol neu economaidd, megis effeithlonrwydd o ran ynni neu gynaliadwyedd cymunedol.