The location of sewer lines and/or existing drains often gets overlooked when plans are drawn up for new structures or alterations and/or extensions. This may lead to more pressure on the existing drainage network than it can handle which in turn will lead to numerous call-outs for plumbers.
Roof surfaces, surface water and waste water disposal are just a few of the factors that needs to be taken into consideration when doing any contractual work.
Redevelopment of areas also creates potential problems as the existing infrastructure seldomly cam provide for group or cluster housing and as a cost cutting measure developers will seldom upgrade existing drainage networks.
The best and only way to avoid disputes later on is to appoint the necessary and qualified plumbers and drainage engineers from the beginning of the project. Remember your building contractor is knowledgeable about building work, but not necessarily about plumbing work.