A flooded basement is not a situation you want to get home to and you ought to take care of that before you get a real problem on your hands. Using some clothes or boards to secure the basement door is not going to be of much help which is why you should get a contractor to do the job. Basements which have not been made to resist water leakage are susceptible to mold growth and the people living in the house will be at risk a far as their health is concerned and this is not a situation you want to put your family through. Do not make a hiring decision before getting referees from the contractor who can tell you about the kind of an outcome they got from working with the contractor. Throwing your money at someone who has not done anything to prove that he or she is able to deliver the standard of work you want is not wise. Get information on why the contractor thinks he is the best person for the job. The response should demonstrate that the person is better than the other candidates.
You should expect great things from a person who is experienced in basement waterproofing compared to someone who has just handled a few projects. It is not disrespectful to ask about this because you will be able to know how much responsibility you should give the contractor. If you are approaching the experience world in terms of just time, you are doing it all wrong. You should inquire about the projects the contractor has taken on and how the basements have held on ever since. Even people who have been doing the work for 5 years might not have the number of projects someone who has been working as a basement contractor for 2 years has to his name.
Ensure the person is licensed before you award the contract. If the contractor is willing to break the law in his work, you should know that he or she is not a trustworthy person and this is not someone you should be inviting into your house. The services should come with a warranty because it is an assurance that you will not be throwing away your money only to have the same kind of a problem a few months later. Work with someone who is honest about the techniques that will be utilized in the basement waterproofing project so that you can get clarification beforehand and if you have concerns you can have them taken care of before the project is too far gone for you to do anything.