# What is the waterproofing cost per sq ft in India?

> Waterproofing cost per sq ft in India (2026): bitumen coating ₹35–₹55/sqft, polymer coating ₹50–₹80/sqft, crystalline ₹80–₹120/sqft, PU (polyurethane) liquid membrane ₹100–₹150/sqft. Bathroom waterproofing: ₹40–₹80/sqft. Roof: ₹35–₹80/sqft. Metros add 25–30%.

**Source:** [https://solve24.in/answers/waterproofing-cost-per-sqft-india](https://solve24.in/answers/waterproofing-cost-per-sqft-india)  
**Updated:** 2026-08-06  
**Trade:** mason  

## Answer

Waterproofing in India (2026) is priced per sq ft by system type. The cheapest is bitumen coating (₹35–₹55/sqft) — traditional black-tar based, 5–7 years life. Polymer-modified coating (₹50–₹80/sqft) — acrylic/cement-based, 8–12 years life, most popular for roofs. Crystalline (₹80–₹120/sqft) — penetrates concrete pores, 15+ years life, used for basements + retaining walls.

Premium tier: PU (polyurethane) liquid membrane ₹100–₹150/sqft — flexible, UV-resistant, 15–20 years life, used for exposed rooftops in hot climates. TPO/EPDM sheet membrane ₹150–₹250/sqft — commercial-grade, 25+ years.

By application area. Bathroom waterproofing (before tile laying): ₹40–₹80/sqft using polymer coating on floor + up to 2ft wall. A standard 5×7 ft bathroom (35 sqft floor + 30 sqft wall): ₹2,600–₹5,200. Roof waterproofing: ₹35–₹80/sqft basic bitumen/polymer; ₹100–₹150/sqft PU membrane. External wall waterproofing (for damp/seepage): ₹40–₹90/sqft.

Metros add 25–30% (Bangalore polymer ₹65–₹104/sqft). Warranty: 5–10 years for polymer, 10–15 years for PU, 15+ years for crystalline. Get warranty in writing before payment.

## Data

**Waterproofing cost per sq ft in India (2026)**

| System | Rate (₹/sqft) | Metro rate (₹/sqft) | Life |
| --- | --- | --- | --- |
| Bitumen (traditional) | 35–55 | 46–72 | 5–7 yrs |
| Polymer-modified coating | 50–80 | 65–104 | 8–12 yrs |
| Cementitious | 45–75 | 59–98 | 8–10 yrs |
| Crystalline | 80–120 | 104–156 | 15+ yrs |
| PU liquid membrane | 100–150 | 130–195 | 15–20 yrs |
| TPO/EPDM sheet | 150–250 | 195–325 | 25+ yrs |
| Bathroom (polymer, pre-tile) | 40–80 | 52–104 | 10–15 yrs |
| Roof (polymer) | 35–80 | 46–104 | 8–12 yrs |
| External wall (damp/seepage) | 40–90 | 52–117 | 8–12 yrs |

## Frequently asked

### Which waterproofing system is best for a rooftop?

For a residential rooftop in India: polymer-modified coating (₹50–₹80/sqft, 8–12 years) is the value pick. For hot climates (Chennai, Ahmedabad, Nagpur) with intense summer exposure: PU liquid membrane (₹100–₹150/sqft, 15–20 years) is worth the extra cost.

### How much does bathroom waterproofing cost?

A standard 5×7 ft bathroom: ₹2,600–₹5,200 all-in for polymer coating on floor + 2ft wall (65 sqft total × ₹40–₹80/sqft). Full-wall waterproofing (up to ceiling): ₹5,000–₹9,000.

### How much does roof waterproofing cost for a 1000 sqft roof?

Polymer: ₹35,000–₹80,000. PU membrane: ₹1,00,000–₹1,50,000. TPO sheet: ₹1,50,000–₹2,50,000. Metros +25–30%. Warranty ranges from 8 to 25 years.

### What is the warranty on waterproofing work?

Standard warranty: 5 years polymer, 8–10 years PU, 15+ years crystalline. Reputable applicators offer manufacturer-backed warranty (Dr. Fixit, Sika, Fosroc). Get warranty in writing before payment.

### What is waterproofing cost in Mumbai?

Mumbai rates: polymer ₹65–₹104/sqft, PU membrane ₹130–₹195/sqft, crystalline ₹104–₹156/sqft (base × 1.3 Mumbai multiplier). Bathroom waterproofing ₹52–₹104/sqft.

## Related

- https://solve24.in/answers/mason-charges-per-sqft
- https://solve24.in/answers/wall-plastering-cost-per-sqft-india
- https://solve24.in/answers/mason-salary-in-india

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