Case Study: Rainwater Harvesting in Yelahanka, Bangalore
Real job · Verified result · July 2026 · By Team LoklFix
Team LoklFix
LoklFix is Bangalore's waterproofing and home maintenance specialist. We've served 500+ homes across Bangalore using brand materials (Dr. Fixit, Fosroc, Asian Paints) with written 5–10 year warranties. Free on-site inspection for any waterproofing or tank cleaning problem. +91-8123083393
Service
Rainwater Harvesting
Area / Scope
30×40 ft plot (1,200 sqft roof)
Total Cost
₹18,500
Material Used
RCC recharge pit + SS mesh filter + first-flush diverter
Duration
1 day
Warranty
N/A
The Problem
A Yelahanka homeowner received a BWSSB notice after their neighbour reported non-compliance during a street-level inspection. The notice specified ₹5,000/month penalty effective from the following month. They had 3 weeks to install a compliant RWH system and submit documentation to BWSSB.
Our Diagnosis
Site assessment: 30×40 ft BDA layout plot with a flat concrete terrace. One existing downpipe from terrace to ground. Soil percolation test: moderate red laterite soil, good absorption rate. Recommendation: single 1.5m × 1.5m × 2m depth recharge pit with SS mesh pre-filter and 25-litre first-flush diverter — the minimum compliant specification for this plot size under BWSSB guidelines.
Key insight: This is why a proper diagnosis before quoting is essential. The right treatment for this job is completely different from what the previous contractors did — and the previous contractors weren't necessarily bad. They just didn't find the actual source before proposing a solution.
The Solution
Excavation of recharge pit (1.5m × 1.5m × 2m), construction with perforated brick walls and gravel fill layers (coarse at bottom, fine at top), connection to existing downpipe via SS mesh filter and first-flush diverter, overflow pipe to storm drain. BWSSB compliance documentation prepared and submitted.
The Result
Installation completed in 1 day. BWSSB compliance certificate received within 10 working days. First monsoon test: recharge pit absorbed full terrace runoff during a 40mm/hr rain event with no overflow — confirming correct sizing. ₹5,000/month penalty avoided from installation month.
What This Job Cost — And Why
The total cost of ₹18,500 for this job breaks down as: 35–40% materials, 25–30% surface preparation and labour, 10–15% mobilisation and equipment. This is higher than the cheapest quotes the customer received — but it produced a permanent fix where two previous cheaper jobs had failed completely.
The framework for evaluating any waterproofing quote isn't price per sqft. It's: What is the contractor's diagnosis of the root cause? What preparation will they do? What material and how many coats? What does the written warranty cover? Get those four answers in writing before comparing quotes.
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