Bridal Alteration FAQs Seams to B Denver Women's Floral Print Fit And Flare Dress Sky Blue Multi Karl Lagerfeld Paris How Much Do Wedding Dress Alterations Cost in Las Vegas? Altered Bride How Much Do Wedding Dress Alterations Cost? How much are alterations normally? I was just quoted $768.. literally panicking because it's 1 2 the price of my dress. I don't know why I expected 500 max. The alterations are;