Permitted additional room / poor construction

[Frederick William]

Purchased a property with a permitted additional bedroom on the second floor. Although permitted, the work seems very poor. The room is held up by 5 wood piers that are awkwardly placed. Can a permitted room have poor construction ? When it’s permitted does the city come to verify the quality of work. My real estate agent failed to mention this. The more I look  at it the more I get worried. Home owners insurance also visited the property and didn’t make issue. Don’t know if that has any impact.