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GEG (Building Modernisation Act)
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Adoption of the Act as Article 1 of the Act of 8 August 2020.
The Act entered into force on 1 November 2020.
The version applicable today entered into force: Article 1 of the Act of 23 July 2026 renamed the Act the Building Modernisation Act and rewrote the rules on heat supply.
Article 2 of the Act of 23 July 2026 enters into force and amends the Act extensively.
From 1 January 2027 a solar energy installation must be built on public non-residential buildings to be constructed and on new non-residential buildings with a useful floor area of more than 250 square metres.
Water-based heating systems installed before 1 October 2009 in buildings with at least six dwellings must undergo a heating check and heating optimisation.
Article 3 of the Act of 23 July 2026 enters into force and inserts Section 10a on zero-emission buildings for new public-sector non-residential buildings.
From 1 January 2028 a solar energy installation must be built on existing public non-residential buildings with more than 2 000 square metres of useful floor area and on existing non-residential buildings with more than 500 square metres where alterations under Section 36 are carried out and calculations under Section 38(3) are performed for the whole building.
From 1 January 2028 life-cycle greenhouse gas emissions must be determined for new buildings with more than 1 000 square metres of useful floor area and set out in a life-cycle greenhouse gas balance report.
First inspection of air conditioning and combined air conditioning and ventilation systems above 12 kW that were more than ten years old on 1 October 2023 (version in force from 1 January 2027).
From 1 January 2029 at least 10 % of the heat supplied by a newly installed gas, heating oil or LPG heating system must come from the fuels listed in Section 43(1).
From 1 January 2029 a solar energy installation must be built on existing public non-residential buildings with more than 750 square metres of useful floor area; the threshold of 2 000 square metres applying since 1 January 2028 is superseded.
Ventilation systems above 70 kW that were more than 20 years old on 1 January 2027 must undergo their first inspection by 1 January 2029. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
Non-residential buildings with a system rated output above 70 kW must be equipped with a building automation and control system and with automatic lighting controls.
Article 4 of the Act of 23 July 2026 enters into force: every building to be constructed must then be a zero-emission building.
From 1 January 2030 the share rises to at least 15 %.
From 1 January 2030 a solar energy installation must be built on new residential buildings and on new roofed car parks physically adjacent to a building.
From 1 January 2030 the annual primary energy demand of an existing non-residential building for heating, hot water, ventilation, cooling and built-in lighting must not exceed 3.5 times that of the reference building.
From 1 January 2030 life-cycle greenhouse gas emissions must be determined for all new buildings, irrespective of useful floor area.
From 1 January 2031 a solar energy installation must be built on existing public non-residential buildings with more than 250 square metres of useful floor area; this completes the roll-out of the solar obligation.
Ventilation systems above 70 kW that were more than twelve years old on 1 January 2027 must undergo their first inspection by 1 January 2031. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
From 1 January 2033 the ceiling tightens to 2.95 times the annual primary energy demand of the reference building.
Ventilation systems above 70 kW that were more than four and up to twelve years old on 1 January 2027 must undergo their first inspection by 1 January 2033. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
From 1 January 2035 the share rises to at least 30 %.
From 1 January 2040 the share rises to at least 60 %.
Expires at milestone
Adoption of the Act as Article 1 of the Act of 8 August 2020.
The Act entered into force on 1 November 2020.
The version applicable today entered into force: Article 1 of the Act of 23 July 2026 renamed the Act the Building Modernisation Act and rewrote the rules on heat supply.
Article 2 of the Act of 23 July 2026 enters into force and amends the Act extensively.
From 1 January 2027 a solar energy installation must be built on public non-residential buildings to be constructed and on new non-residential buildings with a useful floor area of more than 250 square metres.
Water-based heating systems installed before 1 October 2009 in buildings with at least six dwellings must undergo a heating check and heating optimisation.
Article 3 of the Act of 23 July 2026 enters into force and inserts Section 10a on zero-emission buildings for new public-sector non-residential buildings.
From 1 January 2028 a solar energy installation must be built on existing public non-residential buildings with more than 2 000 square metres of useful floor area and on existing non-residential buildings with more than 500 square metres where alterations under Section 36 are carried out and calculations under Section 38(3) are performed for the whole building.
From 1 January 2028 life-cycle greenhouse gas emissions must be determined for new buildings with more than 1 000 square metres of useful floor area and set out in a life-cycle greenhouse gas balance report.
First inspection of air conditioning and combined air conditioning and ventilation systems above 12 kW that were more than ten years old on 1 October 2023 (version in force from 1 January 2027).
From 1 January 2029 at least 10 % of the heat supplied by a newly installed gas, heating oil or LPG heating system must come from the fuels listed in Section 43(1).
From 1 January 2029 a solar energy installation must be built on existing public non-residential buildings with more than 750 square metres of useful floor area; the threshold of 2 000 square metres applying since 1 January 2028 is superseded.
Ventilation systems above 70 kW that were more than 20 years old on 1 January 2027 must undergo their first inspection by 1 January 2029. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
Non-residential buildings with a system rated output above 70 kW must be equipped with a building automation and control system and with automatic lighting controls.
Article 4 of the Act of 23 July 2026 enters into force: every building to be constructed must then be a zero-emission building.
From 1 January 2030 the share rises to at least 15 %.
From 1 January 2030 a solar energy installation must be built on new residential buildings and on new roofed car parks physically adjacent to a building.
From 1 January 2030 the annual primary energy demand of an existing non-residential building for heating, hot water, ventilation, cooling and built-in lighting must not exceed 3.5 times that of the reference building.
From 1 January 2030 life-cycle greenhouse gas emissions must be determined for all new buildings, irrespective of useful floor area.
From 1 January 2031 a solar energy installation must be built on existing public non-residential buildings with more than 250 square metres of useful floor area; this completes the roll-out of the solar obligation.
Ventilation systems above 70 kW that were more than twelve years old on 1 January 2027 must undergo their first inspection by 1 January 2031. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
From 1 January 2033 the ceiling tightens to 2.95 times the annual primary energy demand of the reference building.
Ventilation systems above 70 kW that were more than four and up to twelve years old on 1 January 2027 must undergo their first inspection by 1 January 2033. The deadline belongs to the five-yearly inspection obligation for systems above 70 kW.
From 1 January 2035 the share rises to at least 30 %.
From 1 January 2040 the share rises to at least 60 %.
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