How many letters does the top answer for “the act of building or putting up” have?

The most common answer is erecting (8 letters).

Crossword clue: the act of building or putting up

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

erecting 8 letters wn-def

the act of building or putting up

erection 8 letters wn-def

the act of building or putting up

the act of building up an accumulation 60% similar → buildup