Crossword clue: the house or room in which a merchant, trader, or manufacturer keeps his books and transacts business.

The most common answer is countinghouse (13 letters).

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

Possible answers

countinghouse 13 letters web-def

office used by the accountants of a business

countingroom 12 letters web-def

The house or room in which a merchant, trader, or manufacturer keeps his books and transacts business.