Analyze that the changes that are required do not damage the structure of the house, since this would involve an expense higher than planned, also the execution time would be extended. It is essential to have plans of your home, both construction and electrical and water facilities, as these will be handy so that in case of requesting a job of masonry or plumbing, avoid breaking pipes or make a construction on a lousy structure, which would cause excessive expenses; For this reason, it is essential to hire specialized personnel who respond to their work.