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Technical Guidance Document L - Conservation of Fuel and Energy – Dwellings
From Department of Housing, Local Government and Heritage
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Technical Guidance Documents are published to accompany each part of the Building Regulations indicating how the requirements of that part can be achieved in practice.
Technical Guidance Document L - Conservation of Fuel and Energy – Dwellings (2022)
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Technical Guidance Document L- Conservation of Fuel and Energy – Dwellings (2021)
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Technical Guidance Document L- Conservation of Fuel and Energy – Dwellings (2019) (2.34 MB)
This document is from 2019.
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Technical Guidance Document L- Conservation of Fuel and Energy – Dwellings (2017) (1.46 MB)
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Technical Guidance Document L - Conservation of Fuel & Energy - Dwellings (2011) (985.88 KB)
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Technical Guidance Document TGD PartL - Conservation of Fuel and Energy - Dwellings (2007) (1.73 MB)
This document is from 2007 and was reprinted in 2008.
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Technical Guidance Document L - Conservation of Fuel and Energy Dwellings (2002) (696.1 KB)
This document is from 2002 and was reprinted in 2005.
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Technical Guidance Document L - Conservation of Fuel and Energy (1997) (1.28 MB)
This document is from 1997.
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Technical Guidance Document L - Conservation of Fuel and Energy 1991 (1.09 MB)
This document is from 1991.
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Part L and Part F 2019
Technical and practical implications of the new Part L Dwelling & Part F 2019 - Presentation (3.2 MB)
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Heating & Domestic Hot Water Systems for Dwellings– Achieving Compliance with Part L & Energy Performance of Buildings Regs 2019 (2.2 MB)
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These Acceptable Construction Details (ACDs) focus on thermal bridging and airtightness. This guide will help appropriate persons to achieve the performance standards in the Building Regulations Technical Guidance Document L 2021 – Conservation of Fuel and Energy – Dwellings.
The guide is presented in 2 Parts. Part 1 discusses the general theory of insulation continuity and airtightness in construction. Part 2, in seven separate sections, provides indicative detail drawings of thermal insulation and airtightness provisions for specific construction interfaces.
Part 1
Acceptable Construction Details TGD PartL Building Regulations 2021- Introduction
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Part 2
Acceptable Construction Details TGD PartL Building Regulations 2021- Cavity Wall Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2021- External Wall Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2021- Internal Wall Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2021 - Timber Frame Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2021- Steel Frame Insulation
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Acceptable Construction Details TGD Part L Building Regulations 2021- Hollow Block Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2021- General
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Acceptable Construction Details TGD PartL Building Regulations 2011- Introduction (3.12 MB)
This document is from 2011.
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Acceptable Construction Details TGD PartL Building Regulations 2011- Cavity Wall Insulation (6.09 MB)
Cavity Wall Insulation
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Acceptable Construction Details TGD PartL Building Regulations 2011- External Wall Insulation (4.82 MB)
External Wall Insulation.
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Acceptable Construction Details TGD PartL Building Regulations 2011- Internal Wall Insulation (3.71 MB)
Internal Wall Insulation.
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Acceptable Construction Details TGD PartL Building Regulations 2011 - Timber Frame Insulation (3.42 MB)
Internal Wall Insulation.
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Acceptable Construction Details TGD PartL Building Regulations 2011- Steel Frame Insulation (4.52 MB)
Steel Frame Insulation.
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Acceptable Construction Details TGD Part L Building Regulations 2011- Cavity Block Insulation (4.03 MB)
Cavity Block Insulation.
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Heating and Domestic Hot Water Systems for Dwellings (1.16 MB)
Achieving Compliance with Part L 2008
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Amendment to Heating & Domestic Hot Water Systems for Dwellings (56.22 KB)
This document was published on October 29, 2008.
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Acceptable Construction Details TGD PartL Building Regulations 2011- General (968.7 KB)
General Details.
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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 (345.12 KB)
Procedure for Existing Dwellings.
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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".
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:
- The Home-heating Appliance Register of Performance (HARP) database
- Standard Assessment Procedure (SAP) Appendix Q Ventilation systems database
- Windows Energy Performance scheme (WEPs)
- Certified Air Tightness Tester Scheme
- To Account for Thermal Bridging in DEAP
- NSAI Approved Thermal Modellers Scheme