Standards edition, checked 1 September 2026
  • This page is labelled to TGD L 2021, which is the edition its figures were computed from. The current edition for dwellings is Technical Guidance Document L, Conservation of Fuel and Energy, Dwellings (2022), published on gov.ie.
  • The labels are left as they are because the numbers behind them belong to the 2021 edition. Relabelling them 2022 without recomputing would misreport the source.
  • Cost and performance figures on this page carry no citation and have not been checked against a primary record. Treat them as teaching illustrations.

Recompute against TGD L 2022 before any figure here is used in practice.