BS 8558 is the definitive UK guidance for safe, efficient building water services. Searching for a “BS 8558 pdf” is understandable, but professionals must use the current, paid version to ensure legal and technical accuracy. The standard’s strength lies in its integrated approach – combining backflow prevention, Legionella control, water efficiency, and valve specification – all under one cover. For those unable to purchase, referencing the Water Regulations Advisory Scheme (WRAS) guidance documents or the CIBSE Guide G (Public health engineering) provides partial, but not complete, alternatives.
Recommendation: If you need specific clauses, always cite the standard’s section number (e.g., BS 8558:2015 Clause 8.4.2) and verify with the latest amendment. No summary, including this paper, replaces the authoritative document.
Disclaimer: This paper is for educational and analytical purposes. It does not contain any copyrighted extracts from BS 8558. The standard must be purchased from BSI.
BS 8558 is British Standards guidance supporting the design, installation and maintenance of sustainable drainage systems (SuDS) and conventional surface water drainage for new developments. It interprets and expands on the principles in BS EN 752 and provides recommended good practice for planners, designers, contractors and maintainers.
As of late 2025, BSI is reviewing BS 8558 for potential alignment with the new Building Safety Act and the shift towards digital water management (smart meters, IoT flow sensors). Expect a revision or amendment by 2026/2027 regarding:
If you buy a BS 8558 PDF today, most publishers offer a "standing order" scheme where you automatically receive a free updated PDF if the standard is revised within 12 months.
Once you have legally obtained your BS 8558 PDF, integrate it into your quality management system: bs 8558 pdf
Failing to reference the current standard explicitly can lead to a non-conformance report (NCR) from the principal contractor or water authority.
BS 8558:2015 is the primary British Standard providing complementary guidance to the BS EN 806 series for the design, installation, testing, operation, and maintenance of domestic water services within buildings and their surroundings. It serves as the UK's practical implementation guide for ensuring safe and hygienic water supply. Core Purpose and Scope
Relationship with BS EN 806: BS 8558 bridges the gap between European specifications (BS EN 806) and established UK practices. While BS EN 806 focus on internal systems, BS 8558 includes guidance for underground pipework within a building's curtilage.
Replacement of BS 6700: It formally replaced the long-standing BS 6700 standard, which was withdrawn in August 2012.
Hygiene and Safety: A significant focus of the 2015 revision is the control of Legionella and other waterborne pathogens. It aligns with health and safety codes like HSE ACOP L8 and HSG274. Key Content and Guidance
The standard provides detailed recommendations and technical data, including: BS 8558 and Water Use in Domestic Buildings BS 8558 is the definitive UK guidance for
BS 8558:2015 is the British Standard that provides essential guidance on the design, installation, and maintenance of domestic water services within buildings. It acts as a companion to the European standard BS EN 806, filling in the technical gaps specifically for the UK. Core Purpose
The standard ensures that water systems provide a safe, reliable supply of wholesome water. It covers everything from the point where water enters a property to the taps and appliances it serves. While BS EN 806 focuses on general European requirements, BS 8558 provides the specific "how-to" for UK-specific practices. What the Guide Covers
Design & Pipe Sizing: Detailed methods for calculating flow rates and sizing pipes to prevent pressure drops or excessive noise.
Installation & Alteration: Best practices for laying out pipework, including underground pipes within a building's boundary (which BS EN 806 excludes).
Storage Systems: Guidance on sizing hot water storage to meet demand without wasting energy or risking bacterial growth.
Testing & Maintenance: Procedures for pressure testing new installations and ongoing maintenance to prevent stagnation and leaks. Key Technical Annexes Disclaimer: This paper is for educational and analytical
The document includes specific technical tools to help engineers and installers: Annex A: Examples of pumped water systems.
Annex B: Calculations specifically for hot water storage capacity. Annex C: Formulas and charts for accurate pipe sizing. Why It Matters for Safety Following BS 8558 is critical for:
Preventing Contamination: Ensuring backflow prevention and proper materials are used to keep drinking water safe.
Legionella Control: Maintaining correct temperature regimes (keeping cold water cold and hot water hot) to minimize the risk of Legionella bacteria.
Efficiency: Reducing water and heat wastage through better system design.
You can find official copies or digital versions through engineering resources like Standards Supply or the BSI Shop. BS 8558 PDF - Norm Library
Technically, standards are voluntary unless called up by legislation. However, BS 8558 is cited in:
In practice, if a dispute goes to court (e.g., a Legionella outbreak or burst pipe flood), the judge will ask: "Did you follow BS 8558?" If you cannot produce a BS 8558 PDF to prove you followed the guide, you may be found negligent.