Free tool
Pipe size & type guide
Which pipe, and what size, for hot water, cold water, drainage and rainwater.
Pipe size & type guide
| What you are connecting | Pipe type | Typical size | Note |
|---|---|---|---|
| Main riser / main line inside the house | CPVC (or PPR) | 25 mm (1") | Hot and cold lines. |
| Branch to each bathroom or kitchen | CPVC (or PPR) | 20 mm (3/4") | Larger if many fixtures share the branch. |
| Connection to tap, shower, basin, geyser | CPVC (or PPR) | 15 mm (1/2") | Standard fixture connection. |
| Tank filling, outdoor, garden and borewell lines | UPVC | 25 to 50 mm (1" to 2") | Cold water only. Not for hot water. |
| WC outlet and vertical soil stack | SWR | 110 mm (4") | Keep a continuous slope on horizontal runs. |
| Floor drain, kitchen sink, shower waste | SWR | 50 to 75 mm (2" to 3") | Always trap each fixture. |
| Wash basin waste | SWR | 32 to 40 mm | Joins the stack or a floor trap. |
| Roof and terrace downpipes | SWR / rainwater pipe | 75 to 110 mm (3" to 4") | Size to roof area and rainfall. |
| Sewer and stormwater lines | DWC | 160 mm and above | Pick ring stiffness for depth and load. |
Which material, in one line each
- CPVC: hot and cold drinking water inside the house.
- UPVC: cold water only: tank filling, garden, borewell.
- PPR: hot and cold water, joined by heat fusion.
- SWR: bathroom, kitchen and rainwater drainage in the building.
- DWC: underground sewer and stormwater lines.
General guidance for residential plumbing. Final sizes depend on your design, so confirm them with your plumber or consultant.
How this works
These are common sizes and materials used in residential plumbing in India. Final sizing depends on the number of fixtures, the pressure and your plumber or consultant's design, so treat this as a guide and confirm it against your drawings.
Related tools
Common questions
About this tool
What size CPVC pipe is used for bathrooms?
A common arrangement is 25 mm (1 inch) for the main riser, 20 mm (3/4 inch) for the branch to each bathroom, and 15 mm (1/2 inch) for the connection to each tap or shower.
Can I use UPVC for hot water?
No. UPVC is meant for cold water only. Use CPVC or PPR for hot and cold lines.
What size SWR pipe is used for a WC?
WC outlets are normally connected with 110 mm (4 inch) SWR pipe. Basins and floor drains use smaller sizes, and the vertical stack is normally 110 mm.
Get a free quote
Turn these numbers into a quote
Share a few details and we will come back with brand options and a quotation. Prefer to talk? Call or message us.
- +91 98268 56322
- Chat on WhatsApp
- info@keshripipes.com
- Ramnagar, Raipur, Chhattisgarh 492001