This page contains a Flash digital edition of a book.
The mixed French/German version of the new regulation can be consulted at the following Internet-link:

http://www.legilux.public.lu/leg/a/archives/2007/0221/a221.pdf#page=2

Requirements for new buildings

The requirements for new buildings came into force on the 1st January 2008 and achieve an improvement of about 30% - 50% in comparison to the former standards.

The minimum requirements consist of maximum U-values of building elements (Table 1), building air tightness, external shading measures (summer), insulation of hot water pipes and qualitative requirements for ventilation systems.

Table 2. Air tightness requirements.

Building type (only for new construction)

1 2

3 4 5

Buildings without ventilation equipment Buildings with ventilation equipment

Energy efficient buildings without ventilation equipment

Low energy buildings with ventilation equipment and heat recovery

Passive houses with ventilation equipment and heat recovery

Limit value n50 [1/h]

≤ 3,0 ≤ 1,5

≤ 1,5 ≤ 1,0 ≤ 0,6

The new regulation specifies the maximum primary energy demand values and heating energy demand requirements which must be documented on the energy performance certificate.

The energy performance certificate for residential buildings classifies the energy efficiency, thermal protection and emission categories from category A (high efficiency) to category I (low efficiency). New residential buildings with a total energy reference floor area higher than 1000 m2 must be assessed to ensure that the technical, environmental and economic feasibility of alternative systems such as: › decentralised energy supply systems based on renewable energy, › CHP, › district or block heating or cooling, if available, › heat pumps, under certain conditions, are considered and are taken into account before construction starts.

Table 3. Classes for total energy efficiency in kWh/m2,a.

Building category

Class A

1 2

Multi family building Single family building

≤ 45 ≤ 45

Class A

1 2

Multi family building Single family building

≤ 14 ≤ 22

Class B

≤ 75 ≤ 95

Class B

≤ 27 ≤ 43

Class C

≤ 85 ≤ 125

Table 4. Classes for heating energy efficiency kWh/m2,a.

Building category

Class C

≤ 43 ≤ 69

Class D

Class E

≤ 100 ≤ 155 ≤ 145 ≤ 210

Class D

≤ 54 ≤ 86

Class E

≤ 85

Class F

≤ 225 ≤ 295

Class F

≤ 115 ≤ 130 ≤ 170

Class G

≤ 280 ≤ 395

Class G

≤ 150 ≤ 230

Class H

≤ 355 ≤ 530

Class H

≤ 185 ≤ 295

EPBD Buildings Platform > P119_EN_Luxembourg_Sept 2008

Page 135

Class I

> 355 > 530

Class I

> 185 > 295

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