Relating to or concerning buildings or structures; of or pertaining to an edifice.
From edifice plus the suffix -ial (meaning 'relating to'). This is an extremely rare adjective, mostly appearing in highly technical or historical architectural discussions where specificity about 'building-related' is needed.
Edificial is so rare that even most dictionaries barely list it—it's a word that almost got erased from English because architects and builders found simpler terms like 'structural' or 'architectural' much more useful.
Complete word intelligence in one call. Free tier — 50 lookups/day.