Bay St. Louis, Biloxi, Business, Diamondhead, Gulfport, Long Beach, Pascagoula, Pass Christian, Waveland Custom Homes By Thornhill Construction May 9, 2011 Leave a comment Thornhill Construction 212D Main Street Bay St. Louis, MS 39520 228-424-7773 Custom home builderĀ and contractor for our area that builds beach houses and other custom homes. They also do renovations and additions.