Learn how to write an interior designer cover letter. Get expert tips and downloadable cover letter examples for all levels of experience.Struggling to find your next interior design job? With over nine years of experience in interior design, I've developed the skills and knowledge necessary to successfully complete projects both large and small. Junior Interior Designer Cover Letter Example. Dear Hiring Manager, I am reaching out to express my interest in the Junior Interior Designer position at HOK. Use a visually appealing layout, but ensure readability. A cover letter should be a one-page, roughly 400-word document — a personal introduction that highlights your experience, skills and qualifications. A good cover letter is typically short (usually three-to-five paragraphs). I am writing to apply for the Interior Designer position at your company.