Orleans, Jefferson and St. Tammany buy roofs on three different schedules
Three parishes inside one metro average into a number that hides which half of your budget is working.
In Orleans Parish a great deal of the stock is older and raised on piers, lots are narrow, and a share of the work sits under historic district review. Repairs are common, staging is harder, and the estimator spends longer on site.
Jefferson is a different job. Metairie and Kenner carry more postwar suburban housing, easier access and a higher share of straightforward full replacements. Across the river, the West Bank and Algiers add another wrinkle, because a bridge sits between you and the address no matter what a radius map says.
St. Tammany is a drive. Mandeville, Covington and Slidell hold newer homes and buyers who compare warranty terms, and the round trip eats a half day if your yard is on the south shore.
Give each one its own campaign, its own budget and its own landing page. Then decide honestly which you want more of. Some contractors should turn the Northshore off entirely rather than pay to reach jobs their crews resent.