The interviewer would like to know more about what makes you great at your job. The strengths you mention can be skills or qualities that help you overcome difficult circumstances or accomplish challenging tasks in the home building industry. These skills help you to effectively manage projects, understand client needs, and help you make deals happen!
Try to talk about unique strengths, staying away from the typical answers such as 'organized,' 'good communicator' and 'multitasker.' A hum-drum answer to this question could cost you the job.
Talk to the interviewer about a couple of your strengths and why those will help you to be successful in this role. Tie these strengths into the qualities mentioned in the job posting, for an even stronger response!