Plumbing installation in a new house starts with a clear plan for water and drainage points. Then the pipes are laid with suitable materials and pressure tested, and only after that are they covered with plaster and tiles. Any mistake at this stage is hard to fix later, because it means breaking walls and floors.
In this guide you will learn the order of the installation steps, the difference between pipe types, what to check before pouring and covering, and the most common mistakes we see in plots and apartments.
Why the rough-in stage matters most
Pipes hidden inside walls and floors stay with you for many years. When a leak happens there, it usually shows up as damp paint, peeling walls or a higher water bill, and the repair is costly and disruptive.
That is why installation must be planned from the start and completed before plastering and tiling. To see where plumbing fits in the overall sequence, read our article on the stages of building a house in Kuwait, from receiving the land plot to moving in.
Plumbing installation steps in order
- Mark the points on the plan: Identify the kitchen, bathrooms, laundry area, storage room, courtyard and any annex, and decide the number of points in each.
- Choose fixture locations: Water heater, washing machine, dishwasher and sinks. Make these decisions now, not after covering.
- Lay drainage first: Drain pipes depend on slope, so they are installed before the supply pipes.
- Run hot and cold water pipes: Keep them separated and insulate the hot water lines.
- Install control valves: A main shut-off valve for the house and separate valves for each bathroom and kitchen.
- Pressure test: Keep the system under pressure for a sufficient period and monitor it before any covering.
- Covering and finishing: Only after the test has been approved.
Materials: what to use for supply and drainage
The right material depends on its use, the manufacturer's quality and the installation method. The table below summarises what is commonly used in homes:
| Material | Use | Notes |
|---|---|---|
| PPR | Hot and cold water supply | Joined by heat fusion, strong joints, suitable for concealed lines |
| PEX | Water supply | Flexible with fewer joints, requires correct installation |
| UPVC / PVC | Drainage and venting | Lightweight and easy to install, suitable for drain lines |
| Copper | Water supply in some works | Good quality but higher cost and requires skill |
To compare materials in more detail, read our article on the best types of pipes used in water lines.
Need help with plumbing installation for your new house? The Tashtibatk team is ready to inspect your plan or site, suggest suitable materials and carry out the installation with a clear test before covering. Message us on WhatsApp or call +201096413425.
Tips specific to Kuwait
- Summer heat: Exposed pipes on the roof or in the courtyard are exposed to high temperatures, so protect them with suitable insulation and avoid direct sunlight.
- Soil salinity: Pipes buried outside the house need suitable material and protection, so ask the technician before burying them.
- Rainy season: Make sure the courtyard and roofs drain properly and are connected correctly to the drainage network.
- Tanks and water heaters: Leave space for maintenance and think about the water heater's location so it is easy to reach. You can also review our article on home water heater maintenance.
Common mistakes to avoid
- Covering pipes before the pressure test.
- Ignoring the slope of drainage pipes, which leads to slow drainage and blockages later.
- Using poor-quality joints with good pipes, because a chain is only as strong as its weakest link.
- Not installing secondary valves, so the whole house has to be shut off for any fault.
- Forgetting water points for the dishwasher, courtyard or annex.
Early inspection reduces problems. To learn more about the causes of leaks and how to detect them, read our article on water leak causes and detection in homes. If you are organising the whole project, our guide to the correct order of apartment finishing steps will help you place plumbing in the right sequence.
Next step
Successful plumbing installation means a clear plan, suitable materials, correct slope and a pressure test before covering. Invest time in this stage to avoid breaking walls and making repairs later.
You can view our plumbing service, or contact us to inspect your project:
- WhatsApp: Contact us now
- Phone: +201096413425
- Email: info@tashtibtk.com
- Contact page
Frequently Asked Questions
When is plumbing installed in a new house?
After the structure is complete and before plastering and tiling, so the pipes are laid, tested and then covered.
What are the best pipes for the water supply in the house?
PPR is widely used for its strong heat-fused joints, and PEX is also available. The choice depends on the project, the material quality and the installation.
Do I need a pressure test for the pipes?
Yes. It must be done before covering so any leak at a joint can be found easily and without breaking anything.
How do I know the drainage slope is correct?
The technician checks the direction of the slope and the speed of drainage before covering. Without the correct slope, drainage becomes slow and blockages occur.