Basically, it expands on your construction resume and lets you write about yourself in a more construction personal way. Cover letters don't have to be stiff and formal--avoid the rubber stamp letter. The voice behind the letter should be warm, friendly and genuine. construction employers want to hire real people, not robots. Although your letter should reflect your construction personality, always keep your audience in mind. Catchy opening sentences are wonderful for creative jobs in communications and advertising, but Wall Street might not appreciate it. Before you send out your cover letter, show it to someone in the construction industry to get feedback.