Extension of house

I am seeking an experienced contractor to extend my house with a master suite plus a garage at ground floor level. The desired size is approx 700 sqft in total, and I would prefer a modern style for the extension. It is important to me that the contractors I consider have the necessary skills and qualifications to ensure that the project is completed to a high quality. I am hoping to find someone who is committed to finishing this project within a reasonable time frame and has suitable experience in this type of work. Therefore, I look forward to hearing from any contractors who are interested in taking on this job.