As of late 2025, BSI is reviewing BS 8558 for potential alignment with the new and the shift towards digital water management (smart meters, IoT flow sensors). Expect a revision or amendment by 2026/2027 regarding:
I can provide more targeted guidance or clarify specific engineering calculations outlined within the standard. Share public link
| Standard Version / Format | Price (Approx.) | Source / Notes | | :--- | :--- | :--- | | BS 8558:2015 - PDF (USD) | ~$239.00 - $398.78 | Accuris, Unbound Specs, etc. | | BS 8558:2015 - PDF (GBP) | £439.20 - £488.00 | BSI Group (British Standards Institution) | | BS 8558:2015 - PDF (EURO) | ~€580.95 | Normady, Technormen, etc. | | BS 8558:2011 (Withdrawn) | ~$239.00 (PDF) | Unbound Specs (historical reference) | bs 8558 pdf
Advises on avoiding "dead legs"—lengths of pipe where water might sit still—to minimize the risk of bacterial growth. 2. Installation and Commissioning
Over-sized pipes cause low water velocity, leading to biofilm buildup. Under-sized pipes cause excessive noise, pressure drops, and accelerated pipe erosion. BS 8558 provides specific charts to calculate demand units and simultaneous demand flows. Backflow Prevention As of late 2025, BSI is reviewing BS
Detailed methods for calculating flow rates and sizing pipes to prevent pressure drops or excessive noise.
The Ultimate Guide to BS 8558: Design, Installation, and Maintenance of Domestic Water Services | | BS 8558:2015 - PDF (GBP) | £439
Before a water system is handed over to a building owner, it must undergo rigorous testing to ensure safety and integrity. BS 8558 outlines the protocols for:
For engineering firms and construction companies, a BSOL subscription provides continuous, updated cloud access to BS 8558, BS EN 806, and all related building service standards. Conclusion
Dictates the core specifications for architecture, design, installation, operation, and maintenance.
Proper installation prevents future structural and health hazards. BS 8558 emphasizes: