Case Studies

Non-residential building from the 1970s

Coulanges sur Yonne, France

Code: CS11

Image of the building before the renovation
© Karawitz_arch
Rendering of the building after the renovation
© Karawitz_arch

Original situation

A non-residential building from the 1970s on the outskirts of Coulanges sur Yonne, used as a old age home

Renovation approach

In order to speed up the renovation, prefabricated elements are being applied as often as possible. The renovated part will meet the EnerPHit Standard whereas the new build will reach Passive Classic level.

Modernisation proposal

Semi prefabricated complete retrofit. The two storey building to the left of the main building is being renovated while a new building is being added to the right.

Efficiency improvement

The renovated part will meet the EnerPHit Standard resulting in a factor 7 reduction in heating demand; the new build will reach Passive Classic level. Before the renovation: Bill basis: Electric consumption: 165 kWh/m2.a (78.000 €/a)

PHPP verification sheet after retrofit

TFA existing treated floor area (usable floor space)

3300.0 m2

Space heating Heating demand

22.0 kWh/(m2a)

Heating load

17.0  W/m2

Space cooling Cooling & dehum. demand

2.0 kWh/(m2a)

Cooling load

5.0 W/m2

Frequency of overheating (> 25 °C)

– %

Frequency of excessively high humidity (> 12 g/kg)

3.0 %

Airtightness Pressurization test result n50

1.0 /h

Non-renewable Primary Energy (PE) PE demand

141.0 kWh/(m2a)

Generation of renewable energy (in relation to projected building footprint area)

89.0 kWh/(m2a)

Key facts

Existing treated floor area (usable floor space)

3 300 m2

Building owner

EHPAD Ste Clotilde

Consulting outphit partner


Project status

Planning phase

Overall budget

9 470 000 €


Farid Abachi