Waterproofing Cost Calculator India — Terrace to Bathroom
Estimate waterproofing cost for your terrace, bathroom, sunken slab, or basement — with method comparison and warranty information.
What you'll need
- Area to waterproof (sq ft)
- Surface type — terrace / bathroom / sunken slab / basement
- Preferred waterproofing method
How It Works
Enter area to waterproof
Terrace floor area, bathroom floor + upturned walls, or basement wall area in sq ft.
Select surface and method
Terrace / bathroom / sunken slab and your preferred waterproofing system — from budget cementitious to premium polyurethane.
Get cost and warranty info
See material, labour, and surface prep costs — plus the expected warranty for your chosen method.
Waterproofing Cost per Sq Ft — Terrace (2025–26)
| Method | Cost/sqft | Warranty | Best for |
|---|---|---|---|
| Cementitious (Dr. Fixit) | ₹35–₹65 | 3 yrs | Budgets, interior walls, water tanks |
| Crystalline (Vandex) | ₹60–₹100 | 5 yrs | Concrete surfaces, self-healing cracks |
| Bituminous Membrane | ₹80–₹130 | 10 yrs | Terraces, exposed roofs |
| Polyurethane (Fosroc) | ₹100–₹160 | 10 yrs | Premium terraces, complex shapes |
Surface crack repair: ₹15–35/sqft additional. Sunken slab dismantling and refilling: ₹80–150/sqft additional.
Frequently asked questions
What is the cost of terrace waterproofing per sq ft in India?
Terrace waterproofing costs in India (2026): Cementitious (Dr. Fixit/SikaTop) ₹35–65/sqft, Crystalline ₹60–100/sqft, Bituminous membrane ₹80–130/sqft, Polyurethane liquid membrane ₹100–160/sqft. These include surface prep, material, and labour. Surface crack repair is additional (₹15–35/sqft).
Which waterproofing is best for a terrace in India?
Bituminous membrane or polyurethane liquid membrane are best for Indian terraces due to extreme temperature fluctuations (summer to monsoon). They flex with the structure and provide a seamless barrier. Cementitious products are fine for lower-exposure surfaces (interior walls, water tanks). For a terrace exposed to direct sunlight, add a UV-reflective tile or screed coating over the membrane.
How long does waterproofing treatment last in India?
Properly applied waterproofing lasts: Cementitious — 3–5 years, Crystalline — 5–7 years (self-heals minor cracks), Bituminous membrane — 8–12 years, Polyurethane — 10–15 years. In practice, all treatments eventually need re-application. The warranty is only valid if drainage slopes are maintained and no structural movement occurs.
Why is bathroom waterproofing failing in my apartment?
The three most common causes: (1) Waterproofing applied on dusty or damp surfaces — it doesn't bond correctly, (2) Pipes not properly sealed at wall/floor junctions — water enters at the weakest point, (3) Inadequate curing time before tiling — 48–72 hours minimum required. Most Indian builders use budget cementitious WP applied incorrectly. Re-doing it properly with a membrane and proper curing is the only durable fix.
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