堂宇 is read as どうう (douu) and means edifice.
どうう
douu
いちう
one house
だいう
Daewoo (car company)
ほうう
temple (Buddhist)
きう
breadth of mind
こうう
aerospace
どうどう
grandly
どう
company
どうどうめぐり
circling a temple
はっこういちう
universal brotherhood
ろう
Russia and Ukraine
こうどう
auditorium
でんどう
hall of fame