How many letters does the top answer for “home of parliament house” have?

The most common answer is canberra (8 letters).

Crossword clue: home of parliament house

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

canberra 8 letters wd-fact-v3

the capital of Australia; located in southeastern Australia

newdelhi 8 letters wd-fact-v3

valletta 8 letters wd-fact-v3

the capital of Malta; located on the northeastern coast of the island

home of old parliament house 75% similar → newdelhi

home of abbasi house 50% similar → kashancounty

home of apsley house 50% similar → cityofwestminster

home of banqueting house 50% similar → cityofwestminster

home of blue house 50% similar → jongnodistrict

home of borujerdi house 50% similar → kashancounty

home of burghley house 50% similar → barnack, stmartinswithout

home of burlington house 50% similar → cityofwestminster