Technical Booklet - Performance and introduction to provisions - Part N Regulations - Drainage Guidance

Oct 25, 2026

Technical Booklet issued by the Department of Finance and Personnel provides practical guidance for compliance with the Building Regulations (Northern Ireland) 2012, taking effect from 31 October 2012. It explains that following the guidance supports a presumption of compliance, while noting this presumption can be overturned where circumstances differ from common situations. The document focuses on regulations 80, 81 and 82 and covers general provisions, sanitary pipework, underground foul drainage, and rainwater drainage, with supplementary diagrams and an appendix listing referenced publications.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages36

Reading Time1 h 31 min

AccessFree to download

Introduction

Part N Regulations

Guidance - Performance and introduction to provisions

Section 1 General

Section 2 Sanitary pipework

Section 3 Underground foul drainage

Section 4 Rainwater drainage

Appendix Publications referred to

Department of Finance and Personnel [www.dfpni.gov.uk](www.dfpni.gov.uk) 􀀇􀀞􀀖􀀘􀀒􀀖􀀙 􀀔 􀀍 􀀓􀀔 􀀞􀀘 􀀏􀀝 􀀖􀀚􀀙 􀀜 􀀁􀀋􀀚􀀛􀀝 􀀕 􀀓 􀀛􀀙 􀀊􀀛􀀓 􀀘 􀀏 􀀙􀀒􀀂 􀀆􀀄 􀀅 􀀆 􀀉 􀀞 􀀖 􀀒 􀀏 􀀙 􀀑 􀀓 􀀎 􀀓 􀀑 􀀕 􀀙 􀀖 􀀑 􀀏 􀀘􀀇 􀀚 􀀚 􀀗 􀀘 􀀓 􀀝 􀀈􀀛 􀀏 􀀖􀀙 􀀏􀀔􀀓 􀀋 􀀌 􀀑􀀝 􀀚􀀐 􀀓 􀀛 􀀆􀀄 􀀅 􀀆 Contents page Introduction 2 Part N Regulations 5 Guidance - Performance and introduction to provisions 8 Section 1 General 9 Section 2 Sanitary pipework 10 Section 3 Underground foul drainage 18 Section 4 Rainwater drainage 28 Appendix Publications referred to 31 Introduction 􀀏􀀔􀀒􀀗􀀜􀀘􀀒􀀐􀀚 􀀅􀀝􀀝􀀙􀀚􀀔ts This Technical Booklet, which takes effect on 31st October 2012, is one of a series that has been prepared by the Department of Finance and Personnel (the Department) for the purpose of providing practical guidance with respect to the technical requirements of the Building Regulations (Northern Ireland) 2012 (the Building Regulations) . At the back of each Technical Booklet is a list of all the Technical Booklets that have been prepared and published by the Department for this purpose. The guidance given in a Technical Booklet includes performance standards and design provisions relating to compliance with specific aspects of the Building Regulations for the more common building situations. If the guidance in a Technical Booklet is followed there will be a presumption of compliance with the requirements of those Building Regulations covered by that guidance. However, this presumption can be overturned, so simply following the guidance does not guarantee compliance. For example, if a particular circumstance is not one of the more common building situations the design provisions given in the Technical Booklet may not be appropriate. 􀀏􀀗􀀔r􀀔 􀀐r􀀔 􀀚􀀘􀀙􀀔􀀚y t􀀝 􀀑􀀔 􀀐􀀚t􀀔r􀀜􀀐t􀀘v􀀔 w􀀐ys 􀀝􀀕 􀀓􀀔􀀛􀀝􀀜str􀀐t􀀘􀀜􀀖 􀀒􀀝􀀛􀀞􀀚􀀘􀀐􀀜􀀒􀀔 w􀀘t􀀗 t􀀗􀀔 r􀀔􀀚􀀔v􀀐􀀜t r􀀔 u􀀘r􀀔􀀛􀀔􀀜ts 􀀝􀀕 t􀀗􀀔 􀀅u􀀘􀀚􀀓􀀘􀀜􀀖 􀀍􀀔􀀖 u􀀚􀀐t􀀘􀀝􀀜s 􀀝t􀀗􀀔r t􀀗􀀐􀀜 􀀑y 􀀕􀀝􀀚􀀚􀀝w􀀘􀀜􀀖 􀀐 􀀓􀀔s􀀘􀀖􀀜 􀀞r􀀝v􀀘s􀀘􀀝􀀜 􀀖􀀘v􀀔􀀜 􀀘􀀜 􀀐 􀀏􀀔􀀒􀀗􀀜􀀘􀀒􀀐􀀚 􀀅􀀝􀀝􀀙􀀚􀀔t􀀄 􀀏􀀗􀀔r􀀔 􀀘st􀀗􀀔r􀀔􀀕􀀝r􀀔 􀀜􀀝 􀀝􀀑􀀚􀀘􀀖􀀐t􀀘􀀝􀀜 t􀀝 􀀐􀀓􀀝􀀞t 􀀐􀀜y 􀀞􀀐rt􀀘􀀒u􀀚􀀐r 􀀞r􀀝v􀀘s􀀘􀀝􀀜 s􀀔t 􀀝ut 􀀘􀀜 􀀐􀀏􀀔􀀒􀀗􀀜􀀘􀀒􀀐􀀚 􀀅􀀝􀀝􀀙􀀚􀀔t􀀂 s􀀗􀀝u􀀚􀀓 y􀀝u 􀀓􀀔􀀒􀀘􀀓􀀔 t􀀝 􀀒􀀝􀀛􀀞􀀚y 􀀘􀀜 s􀀝􀀛􀀔 􀀝t􀀗􀀔r w􀀐y􀀄􀀈􀀝w􀀔v􀀔r􀀂 y􀀝u w􀀘􀀚􀀚 􀀗􀀐v􀀔 t􀀝 􀀓􀀔􀀛􀀝􀀜str􀀐t􀀔 t􀀗􀀐t y􀀝ur 􀀐􀀚t􀀔r􀀜􀀐t􀀘v􀀔 s􀀝􀀚ut􀀘􀀝􀀜􀀛􀀔􀀔ts t􀀗􀀔 r􀀔􀀚􀀔v􀀐􀀜t r􀀔 u􀀘r􀀔􀀛􀀔􀀜ts 􀀝􀀕 t􀀗􀀔 􀀅u􀀘􀀚􀀓􀀘􀀜􀀖 􀀍􀀔􀀖u􀀚􀀐t􀀘􀀝􀀜s 􀀑y t􀀗􀀝s􀀔 􀀝t􀀗􀀔r 􀀛􀀔􀀐􀀜s􀀄 􀀏􀀗􀀘s 􀀏􀀔􀀒􀀗􀀜􀀘􀀒􀀐􀀚 􀀅􀀝􀀝􀀙􀀚􀀔t 􀀍􀀔 u􀀘r􀀔􀀛􀀔􀀜ts The guidance contained in this Technical Booklet relates only to the requirements of regulations 80, 81 and 82. The work will also have to comply with all other relevant requirements of the Building Regulations. 􀀉􀀐t􀀔r􀀘􀀐􀀚s 􀀐􀀜􀀓 w􀀝r􀀙􀀛􀀐􀀜s􀀗􀀘􀀞 Any building work which is subject to requirements imposed by Part A of the Building Regulations should be carried out in accordance with regulation 23 of those regulations. Guidance on meeting these requirements for materials and workmanship is given in Technical Booklet B which supports Part B. The Building Regulations are made for specific purposes, primarily securing the health, safety, welfare and convenience of people and for the conservation of fuel and power. Standards and technical approvals are relevant guidance to the extent that they relate to these purposes. However, they may also address other aspects of performance such as serviceability, or aspects which although they relate to health and safety are not covered by the Building Regulations. 􀀊􀀐􀀛􀀔􀀓 st􀀐􀀜􀀓􀀐r􀀓s Where this Technical Booklet makes reference to a named standard, the relevant version of the standard is the one listed in the Appendix. However, if this version has been replaced or updated by the issuing standards body, the new version may be used as a source of guidance provided that it continues to address the relevant requirements of the Building Regulations. 􀀆􀀘􀀐􀀖r􀀐􀀛s The diagrams in this Technical Booklet supplement the text. They do not show all the details of construction and are not intended to illustrate compliance with any other requirement of the Building Regulations. They are not necessarily to scale and should not be used as working details. 􀀌r􀀝t􀀔􀀒t􀀔􀀓 􀀑u􀀘􀀚􀀓􀀘􀀜􀀖s District councils have a duty

FAQs

When does the Technical Booklet take effect, and what is its purpose?

It takes effect on 31st October 2012. It provides practical guidance for meeting technical requirements of the Building Regulations (Northern Ireland) 2012.

Does following the Technical Booklet guarantee compliance with the Building Regulations?

No. Following the guidance creates a presumption of compliance, but the presumption can be overturned if the specific situation is not one of the more common building situations covered by the guidance.

Which specific regulations does this Technical Booklet relate to?

It relates only to the requirements of regulations 80, 81 and 82, while other relevant Building Regulations still apply.

Oct 25, 2026

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