Printer-friendly versionPrinter-friendly version

Technical Guidance Document L- Conservation of Fuel and Energy – Dwellings

cover - Technical Guidance Document L - Conservation of Fuel and Energy - Dwellings

Current Edition

Previous Editions

Supplementary Documents

Part L and Part F 2019

Technical and practical implications of the new Part L Dwelling & Part F 2019 - Presentation (October 2019)

Acceptable Construction Details

These Acceptable Construction Details (ACDs) focus on thermal bridging and airtightness.  This guide will help appropriate persons to achieve the performance standards in the Technical Guidance Document (TGD) to Part L of the Building Regulations 2011 – Conservation of Fuel and Energy – Dwellings.

The guide is presented in 2 sections.  Section 1 discusses the general theory of insulation continuity and airtightness in construction.  Section 2, in seven separate parts, provides indicative detail drawings of thermal insulation and airtightness provisions for specific construction interfaces.

  • Section 2 – Acceptable Construction Details

General Details
Cavity Wall Insulation
External Wall Insulation
Internal Wall Insulation 
Timber Frame Insulation
Steel Frame Insulation
Cavity Block Insulation

Heating and Domestic Hot Water Systems for Dwellings- Achieving Compliance with Part L 2008

Amendment to Heating & Domestic Hot Water Systems for Dwellings - 29.10.08

This is the supporting document referred to in Par 1.4.1 of Technical Guidance Document L - Dwellings 2007.  It is a source of guidance on the means of complying with the requirements of the Building Regulations for space heating systems and hot water systems.

Guide to the Condensing Boiler Installment Assessment Procedure for Existing Dwellings

This document contains the detailed guidance referred to in paragraph 2.2 of Technical Guidance Document L - Dwellings 2007 to assess specific situations where the provision of condensing boilers is not practicable. It is also included as an appendix in the document "Heating and Domestic Hot Water Systems for Dwellings - Achieving Compliance with Part L".

Dwellings Energy Assessment Procedure

The Dwellings Energy Assessment Procedure (DEAP) methodology required to show compliance of dwellings with Regulation L2(a) of Part L, as amended by the Building Regulations (Amendment) Regulations 2005 (S.I No. 873 of 2005), and contained in the May 2006 Edition of TGD L, can be accessed and downloaded from the Sustainable Energy Authority of Ireland's website.

The following are links to databases which also support the DEAP procedure: -