Under-slung plumbing design
- Mohammad Quadri
- Apr 19, 2023
- 1 min read
Updated: Dec 23, 2025

Sewage and drainage systems in bathrooms can be designed in two ways as part of an efficient plumbing design for building projects:
Sunken system, which is what has been traditionally done in homes and is still being used in most builder floors/ villas, which are under construction. In this, all plumbing for sewage and drainage is buried below the floor of the bathroom in a sunken area.
Under-slung system, underslung plumbing system, which is followed in hotels and now, mostly as group housing projects by all prominent big developers. In this system, underslung plumbing for sewage and drainage is taken from below the slab.
Benefits of under-slung systems to the owner are:
If there is any leakage in sewage or drainage pipes in bathrooms, it becomes visible very soon, before the problem becomes too big.
Repair of any pipe is easy as no floor is to be damaged.
A family that is negatively impacted by the leakage can get the work executed independently.





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