Part G & BREEAM Water Compliance.
In Minutes, Not Hours.
Generate fully compliant Part G water efficiency calculations and formal BREEAM Wat 01 compliance statements for Building Control and Local Planning Authority submissions — covering all BREEAM levels from Pass to Outstanding, for any number of plots.
5Levels
BREEAM Wat 01 Covered
80–135L/p/d
BREEAM Target Range
∞Plots
Per Project, Any Size
100%Free
No Hidden Charges
From blank page to compliance report in minutes
No spreadsheets. No manual calculations. No guesswork.
Enter Project Details
Add your site address, client name, assessor details and select your compliance target — Part G (125/110 L/p/d) or any BREEAM Wat 01 level from Pass to Outstanding.
Add Plots & Fittings
Input water fittings, appliances and water reuse systems for each plot. Our engine runs the Part G Appendix A calculations automatically.
Download Your Report
Get a professional, branded PDF report showing pass/fail status, consumption breakdowns and all required data for Building Control submission.
Built for planning professionals who need results fast
Multi-Plot Projects
Handle developments of any size — one plot or one hundred.
Water Reuse Deductions
Rainwater harvesting and greywater recycling factored in automatically.
Print-Ready PDF Reports
Professional documentation that Building Control will accept, first time.
Appendix A Methodology
Exactly as required by Approved Document G — no shortcuts.
Consumption Breakdown Charts
Visual data by fixture type so you can see exactly where water is used.
Save & Resume Any Time
Your projects are saved to your account — pick up exactly where you left off.
Join assessors, architects and planning consultants who use Part G Online to cut compliance time and eliminate calculation errors.
Now covering all 5 BREEAM levels for water
From Pass to Outstanding, generate formal water compliance statements that satisfy BREEAM Wat 01 and local planning authority conditions — using the same Approved Document G Appendix A calculation method that underpins the BREEAM assessment.
Outstanding
≤80L/p/d
5 Wat 01 credits
Excellent
≤95L/p/d
4 Wat 01 credits
Very Good
≤110L/p/d
3 Wat 01 credits
Good
≤125L/p/d
2 Wat 01 credits
Pass
≤135L/p/d
1 Wat 01 credit
Formal LPA Statements
Generate a premium compliance statement citing the planning condition, methodology, and calculated consumption — ready to submit to the Local Planning Authority.
Same Calculation Engine
BREEAM Wat 01 uses the identical Appendix A method as Part G. One calculation serves both Building Regulations and BREEAM water credits.
Design & As-Built
Produce statements at both design stage and as-built stage, with per-plot compliance against your chosen BREEAM target.
Need a BREEAM water compliance statement for your planning condition?
Select any BREEAM level in the calculator and generate a formal statement in minutes.
David Oldham
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Part G & BREEAM water compliance — frequently asked questions
Everything you need to know about water efficiency calculations for UK developments.
Understanding the Part G Water Efficiency Requirements
Building Regulations Part G (Sanitation, hot water safety and water efficiency) ensures new homes are built to be sustainable. All new residential developments in England and Wales must demonstrate compliance.
"Took us from a 45-minute manual spreadsheet process to a 5-minute calculation with a report we could submit directly to Building Control. An absolute game changer."
S. Edwards
BREEAM Assessor, South East England
Stop doing Part G manually.
Start doing it properly.
Free to use. No subscription. Professional results every time.
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