Plumbing & Drainage

Plumbing and drainage covers a building's hot and cold water supply, soil, waste and rainwater drainage, venting, sanitary fixtures and pumping. Most failures after handover come from drainage falls and venting rather than leaks, so correct falls, vents, compatible pipe materials and pressure testing are decided at installation.

By Dhruv Agarwal · · 1 min read

What we deliver

Cold and hot water supply, drainage and venting, sanitary fixtures, and pumping for offices, hotels, hospitals, factories and institutional buildings — installed, pressure tested and handed over.

Plumbing is the service nobody notices until it goes wrong, and when it does, it is usually concealed inside a finished floor or wall. The work that prevents that happens at installation: falls, venting, supports and testing.

Scope of works

StageWhat we deliver
DesignFixture schedule, water demand, pipe sizing, riser strategy
Water supplyCold and hot water distribution, valves, meters
DrainageSoil, waste and rainwater lines with correct falls
VentingVent stacks and branch vents
FixturesSanitary ware, CP fittings, pantry and wet area connections
PumpingTransfer and pressure boosting pumps where required
TestingPressure test on supply, water test on drainage
HandoverAs-built drawings, test records

Where projects go wrong

  • Insufficient drainage fall. Slow drainage and blockages, discovered after the floor is finished.
  • Venting omitted or undersized. Traps siphon, and the smell arrives in the occupied space.
  • Pressure testing skipped. Leaks are then found in finished ceilings.
  • Risers located late on a fit-out. Wet areas end up where drainage can reach, not where the layout needed them.
  • Incompatible pipe materials at joints. A frequent and avoidable cause of failure.

Why Hagerstone

15 plumbers and 15 fitters in-house, with pipe threading, cutting, bending and pressure testing equipment owned rather than hired — and plumbing delivered alongside the interiors and firefighting it has to coordinate with.

79+ quality checkpoints under ISO 9001 / 14001 / 45001.

Standards referenced

Plumbing services under NBC 2016, Part 9. Basic requirements for water supply, drainage and sanitation to IS 1172.

Standards referenced

  • NBC 2016, Part 9 — Plumbing services (Bureau of Indian Standards)
  • IS 1172 — Code of basic requirements for water supply, drainage and sanitation (Bureau of Indian Standards)

Frequently asked

Drainage falls and venting, far more often than leaks. A drain laid with too little fall, or without proper venting, drains slowly, gurgles, blocks and smells — and it is concealed in a floor or wall by the time anyone notices. These are decided during installation and are very hard to correct once finished.

It depends on the service. CPVC and PPR are common for hot and cold water supply in commercial buildings; uPVC and HDPE for drainage; GI and MS still appear on larger mains and firefighting. The choice turns on pressure, temperature, fire rating and what is concealed where — and mixing incompatible materials at joints is a frequent source of failure.

Less than industrial or hospitality work, but the pantry, washrooms, and any wet areas added to a floor all need supply, drainage and venting connected to the base-build risers — often at a point the landlord did not anticipate. Locating those risers and confirming spare capacity early prevents the pantry ending up where the drainage can reach rather than where it was planned.

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