Yes, authorized user trade lines can help you buy a house. When you apply for a mortgage, your credit score is crucial in determining your eligibility and the interest rate you will receive. You can boost your credit score by adding a mortgage tradeline with a positive payment history and low credit utilization. Thus improving your chances of getting approved for a mortgage. Loan providers use your credit score to assess your creditworthiness. They also use it to determine the level of risk involved in lending to you. A higher credit score increases your chances of loan approval. It also allows you to secure more favorable terms and interest rates. You can enhance your credit profile by strategically adding tradelines for sale to your credit report. This increases your chances of qualifying for a mortgage loan.