Loss of hot water when another tap is turned on, particularly in older homes when hot and cold water pressures are not balanced. A pressure balance valve might be needed. Toilet tank leaks, plumbing parts within the tank or seals may need replacing. To make certain these plumbing repair issues are correctly addressed, or when doing a transforming project, you may need to enroll the services of an approved plumbing contractor. Plumbing a Rework or New Construction A remodeling project might include new plumbing design or new plumbing installation. You'll need to rendezvous with the plumber and all contractors concerned and develop a timeline, so everybody works together and the project goes smoothly. Before taking bids from potential plumbing contractors, ensure you have detailed plans. Provide each applicant with a matching copy of the plans. Ask applicants if they are approved to do plumbing. Ask each applicant when they could start, and when the project would be finished. Take some time to test references on other projects they have finished. To discover an approved Plumbing contractor in your neighborhood, use references from folk you know, or check with a local licensing agency.