Underground Water Tank Design & Cost – RCC, Plastic & Coated Options in Lahore (2025 Guide)
An underground water tank is a critical part of any house construction in Lahore. Whether you’re living in DHA, Bahria Town, Lake City, or Park View City, having a well-designed water tank ensures an uninterrupted supply, especially during summer shortages or low-pressure hours.
This 2025 guide covers types of underground tanks, recommended sizing, construction materials (RCC vs plastic vs coated options), and updated cost estimates tailored for 10 Marla and 1 Kanal homes.
🧱 Why an Underground Water Tank?
- Ensures consistent water availability despite pressure issues
- Protects water from sunlight, heat, and contamination
- Can store supply for entire home usage or motor pumping
- Required by most housing societies as part of utility layout
🔧 Recommended Tank Size by House Type
| House Size | Recommended Tank Capacity | Usage |
| 5 Marla | 800 – 1,000 gallons | Daily usage for 4–6 people |
| 10 Marla | 1,200 – 1,500 gallons | Multiple bathrooms + kitchen + lawn |
| 1 Kanal | 2,000 – 3,000 gallons | Full home load including terrace, car wash |
💡 Pro Tip: Always plan your tank placement during excavation stage to avoid costly demolition later.
💸 Underground Water Tank Construction Cost in Lahore (2025)
| Tank Type | Cost (PKR/gallon) | Total for 1,500 Gallons |
| RCC (Brick + Concrete) | 50 – 80 | PKR 75K – 120K |
| RCC with Waterproof Coating | 80 – 100 | PKR 110K – 150K |
| Fiber/Plastic Tank (Prebuilt) | 100 – 150 | PKR 150K – 200K |
Excavation, steel shuttering, water stop, and manhole lid may incur additional charges (~PKR 30K – 50K)
🏗️ RCC Water Tank Design Structure
| Component | Details |
| Walls | 9″ brick masonry or RCC poured concrete |
| Base Slab | 6″–8″ thick with waterproofing layer |
| Roof Slab | 6″ RCC slab with access manhole |
| Internal Plaster | 1:2 cement plaster + waterproof admixture |
| Outlet/Inlet Pipes | GI / UPVC with valves & float system |
💡 Add PVC water stops at joint corners to avoid future seepage.
🛡️ Waterproofing & Coating Options
| Method | Cost (PKR/sq. ft.) | Use |
| Bitumen Coating (internal) | 60 – 80 | Prevents leakage from joints |
| Crystalline Waterproofing | 100 – 150 | Deep penetration, durable |
| Epoxy Coating | 150 – 200 | Used in premium tank interiors |
🧪 Tank Maintenance Tips
- Clean twice annually to avoid sediment & algae build-up
- Install a mesh cover on inlet to block leaves/insects
- Flush outlets before using water for drinking
- Use chlorine tablets or anti-bacterial drops occasionally
📍 Tank Trends by Society in Lahore
| Society | Common Practices (2025) |
| DHA Lahore | RCC tank with crystalline waterproofing |
| Bahria Town | Brick wall tanks with bitumen lining |
| Lake City | Fiber tanks for speed + tile slab finish |
| Park View / LDA | Budget RCC tanks with standard plaster |
🔗 Related Utility & Finishing Blogs
- Waterproofing & Anti-Damp Solutions (2025)
- Sanitary Fitting Cost – Bathrooms & Kitchens
- Solar Panel Setup & Water Motor Integration
📢 Final Thoughts: Store It Safe, Use It Smart
A properly built underground water tank ensures peace of mind, hygiene, and uninterrupted supply for your home. Whether you opt for brick-lined RCC or modern fiber tanks, the key lies in good sizing, proper waterproofing, and smart plumbing.
In Lahore’s growing urban footprint, it’s one investment you’ll never regret.
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