Contractor

Name : Delvigne Elie

Contact : [email protected]

Construction Manager

Name : Homeco

Contact : Elie Delvigne

Stakeholders

Function : Designer

Homeco architecture
Xavier Bachelart
architect

Owner approach of sustainability

The aim was to carry out a renovation (environmental impact of a renovation vs. new construction) of a house in an urban context (proximity to services, public transport, etc.).

The objective of the renovation was to show that it is possible to achieve high energy performance (A+ label) without the use of fossil fuels (only a wood-burning stove heats the house) and by using bio-based materials (gramitherm insulation on the roof).

The consumption of the house is currently 0 € (wood recovered from neighbours, electricity compensated by photovoltaic panels).

In terms of biodiversity, a permaculture vegetable garden, a greenhouse and a henhouse have been installed. 

Architectural description

Work on the building envelope:

- external insulation of walls ;

- insulation of the attic floor;

- triple glazed aluminium joinery;

- insulation of the floor slab and the cellar ceiling; 

- work on the airtightness. 

Systems: 

- Heating by wood stove (independence from fossil fuels); 

- Domestic hot water by electric boiler (simplicity of installation); 

- double flow ventilation system with heat recovery; 

- photovoltaic panels to compensate for electricity consumption. 

Energy consumption

• Primary energy need : 44,00 kWhep/m².an
• Primary energy need for standard building : 510,00 kWhep/m².an

Calculation method : RT 2012

CEEB : 0.0026

• Final Energy : 40,00 kWhef/m².an
Breakdown for energy consumption :

According to the PEB certification method: 79% heating, 15% DHW, 6% auxiliaries

More information :

Consumption = 0. Wood recovered when cutting trees, electricity consumed offset by photovoltaics

• Initial consumption : 658,00 kWhep/m².an

Envelope performance

• Envelope U-Value : 0,33 W.m^-2.K^-1
More information :

Roof insulation with Gramitherm insulation, facades insulated from the outside with plaster on EPS insulation, floor slab insulated with icynene foam. Triple glazed aluminium joinery.

• Building Compactness Coefficient : 0,62

Indicator : n50

• Air Tightness Value : 5,00
 Test blower door

Systems

Heating system :
• Wood boiler
Hot water system :
• Individual electric boiler
Cooling system :
• No cooling system
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Wood boiler
• Renewable energy production : 100,00 %

Solar photovoltaic system installation composed of 20 panels of 270 Wc

GHG emissions

• GHG in use : 1,00 KgCO₂/m²/an
Methodology used :

Certification PEB

• GHG before use : 120,00 KgCO₂ /m²
• Building lifetime : 50,00 an(s)

, ie xx in use years : 120

Water management

• Consumption from water network : 30,00 m³
• Consumption of harvested rainwater : 40,00 m³

Water Self Sufficiency Index : 0.57

Water Consumption/m2 : 0.1

Water Consumption/Dwelling : 30

10,000-litre rainwater tank which supplies the toilets, the washing machine and the outdoor taps used for the vegetable garden

Indoor Air quality

The double flow ventilation ensures a constant and continuous ventilation of the building. 

Solvent-free paint was used to paint the walls (Belgian brand PEINTAGONE). 

Product

Gramitherm
Gramitherm
[email protected]

Product category : Second œuvre / Cloisons, isolation

Grass-based insulation

Happy to test this bio-based, innovative and local solution

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Double flow ventilation
Zehnder

Product category : Génie climatique, électricité / Ventilation, rafraîchissement

Double flow ventilation

Improved air quality, night cooling in summer

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Wood stove
STUV

Product category : Génie climatique, électricité / Chauffage, eau chaude

Wood stove

Wood stove "heat", independence from renewable energy

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Photovoltaic installation
JA Solar

Product category :

20 solar panels of 270 Wp

Electricity bill at 0

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Solvent-free paint
Peintagone
[email protected]

Product category : Second œuvre / Peinture, revêtements muraux

Velvety matt acrylic paint, almost solvent-free and plasticizer-free, very washable.

Solvent-free paint used throughout the house to minimise the air quality impact of finishes

Construction and exploitation costs

• Reference global cost : 1 500,00 €
• Renewable energy systems cost : 6 900,00 €

Reference global cost/Dwelling : 1500

• Total cost of the building : 190 000 €
• Subsidies : 30 000 €
Additional information on costs :

The renovation cost 600 € / m² HVAC

Urban environment

Existing house on the outskirts of an urban centre (city of Mons). 

A bus line passes in front of the building (bus stop a few dozen metres away).

A cycle track is in front of the building (see photo). 

A permaculture vegetable garden has been set up in the garden with a chicken coop and a greenhouse. 

Parking spaces

Parking spaces are located on the side of the building.
Annex buildings accommodating bicycles.

Building Environmental Quality

• indoor air quality and health
• biodiversity
• works (including waste management)
• comfort (visual, olfactive, thermal)
• water management
• energy efficiency
• renewable energies
• products and materials