Four tools.
One decision:
how much is water costing you?
Calculate your water savings opportunity, set GRESB-compliant reduction targets, model cap rate asset value impact, and estimate billing error exposure — using WST’s verified portfolio data as the benchmark baseline.
Translate water savings
into asset value.
Enter your annual water cost reduction and cap rate. The calculator returns the direct asset value contribution, the IC presentation format, and the portfolio-level aggregate impact.
Total annual water + sewer spend across the asset
WST portfolio average: 25.3% for hospitality, 18–22% for office
Download the IC Presentation Template
Pre-formatted investment committee narrative with cap rate value table, payback analysis, and GRESB documentation framework. Ready to present.
Three categories of exposure.
One estimate in 30 seconds.
Input your property type, annual water bill, and what systems are present. The estimator models the three cost categories WST consistently finds — billing errors, cooling tower waste, and sewer overcharges — using WST’s verified portfolio averages as the baseline.
Request a Scoped Savings Estimate
Send WST 12 months of utility bills for one property. Findings in 5 business days. Zero cost, zero commitment.
Where is your water score?
Where could it be?
Toggle which GRESB water indicators your portfolio currently satisfies and see your current score. Then toggle the WST programme deliverables to see the achievable score improvement within one reporting cycle.
Toggle the indicators your portfolio currently satisfies:
Toggle the WST deliverables you plan to deploy:
The gap between 67.7% and 100% is almost never a performance problem. It is a documentation problem. The field savings exist. The submission evidence does not.
Download the GRESB Water Gap White Paper
Why hotel REITs average 67.7% on the water indicator and the three-step programme to close the gap. 12 pages.
Where does your property
sit in the distribution?
WST’s portfolio benchmarking data across 500+ commercial properties, by asset class. Enter your water use intensity and see where you rank against median and best-in-class performance — and what the gap costs annually.
| Asset Type | Least Efficient | Sector Median | WST Portfolio Avg | Best-in-Class | GRESB Target |
|---|---|---|---|---|---|
| Full-Service Hotel | 220+ gal/room/day | 155 gal/room/day | 115 gal/room/day | 88 gal/room/day | –25% vs baseline |
| Class A Office ★ | 52 gal/sqft/yr | 32 gal/sqft/yr | 22 gal/sqft/yr | 14 gal/sqft/yr | –20% vs baseline |
| Mixed-Use | 44 gal/sqft/yr | 28 gal/sqft/yr | 20 gal/sqft/yr | 13 gal/sqft/yr | –20% vs baseline |
| Multifamily Residential | 120 gal/unit/day | 80 gal/unit/day | 62 gal/unit/day | 48 gal/unit/day | –15% vs baseline |
| Retail / Shopping Centre | 18 gal/sqft/yr | 11 gal/sqft/yr | 7.5 gal/sqft/yr | 4.5 gal/sqft/yr | –15% vs baseline |
★ Selected asset type. WST portfolio averages based on verified utility bill data from 500+ commercial properties. GRESB targets represent a 15–25% reduction from the current portfolio baseline, which is the minimum required for a meaningful score improvement.
Download the Full Benchmarking Dataset
Complete water use intensity benchmarks across 12 commercial asset classes, with GRESB target ranges and WST portfolio averages. Updated Q1 2026.
Related Resources
Tools used alongside
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estimate to verified?