At Alt Construction, we specialize in creating custom extensions that add value, space, and style to both residential and commercial properties across Leeds, York, and surrounding areas. Whether you’re looking to expand your living space, add a new room, or extend your office building, our team is dedicated to delivering high-quality results that seamlessly integrate with your existing structure. With over 15 years of experience, we ensure every extension project is completed on time, within budget, and to the highest standards.