Technical Guidance Documents are published to accompany each part of the Building Regulations in Ireland indicating how the requirements of that part can be achieved in practice.

Technical Guidance Document L (TGD L) indicates the requirements for Conservation of Fuel and Energy.

A new TGD L is due to be published in 2019. The new document follows a revision of the Energy Performance of Buildings Directive (EPBD). Member States have until March 2020 to translate into national law all the new requirements from the EU energy efficiency legislation affecting buildings.

Draft Transitional Arrangements:

  • NZEB and TGD L 2019 Dwellings to apply to new Dwellings commencing construction from 1st November 2019 subject to transition.
  • Transitional arrangements to allow TGD L 2011 – Dwellings to be used where planning approval or permission has been applied for on or before 31st October 2019 and substantial completion is completed within 1 year i.e. by 31st October 2020.

Overview of key changes to TGD L Dwellings 2019:

  • Introduction of NZEB (Nearly-Zero Energy Building), MPEPC (Maximum Permitted Energy Performance Coefficient)=0.30, MPCPC (Maximum Permitted Carbon Performance Coefficient)=0.35
  • Introduction of Major Renovations to a cost optimal level where technically, economically and functionally feasible
  • Introduction of a Renewable Energy Ratio (RER) of 20% as per ISO EN 52000 (to replace 10kWh/m2 /yr).
  • Reduction of air permeability backstop from 7m3 /hr/m2 to 5m3 /hr/m2
  • Table 1- Reduction of wall and floor backstop U-Value from 0.21W/m2K to 0.18 W/m2K
  • Table 1- Reduction of window backstop U-Value from 1.6 W/m2K to 1.4 W/m2K
  • Inclusion of guidance to avoid overheating in dwellings
  • Par – removal of variation of U-Value with percentage glazing • Introduction of calculation of Ru value for corridors in apartments.

The draft TGD L – Dwellings 2019 can be accessed here.

The current TGD L – Dwellings 2011-2017 can be accessed here.

Minimum BER rating for new houses built in 2019.

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