Making your house more efficient and greener is a good way to make a gesture for the environment while saving energy very interesting. But in fact, an energy renovation, what does it involve what work in the house? And above all, at what price?
Energy renovation: the 3 items of expenditure
And yes: to know the budget to provide for an energy renovation, we must first ask what work will be done in our home!
Making your home more energy-efficient requires that you focus on 3 criteria, each of which will require different work:
1. The insulation. This is often the weak point of old houses, and a crucial point of renovation work. Because a poorly insulated house, it is a house that we will have to heat (or cool, in summer!) Twice more, for nothing, because the heat does not remain. And heat loss is the worst enemy of energy savings!
2. Heating and heat production. The heating and hot water budgets are the ones that make us spend the most in the house. Hence the importance of finding a heating system adapted to the home, ecological and economical!
3. And ventilation of the house. Air quality is also a criterion to take into account in the eco-renovation of a house.
What works and what budget to plan?
If we refer to the 3 criteria that we have just discussed, the work to be planned is:
1. For insulation. For a better insulated house, it will be necessary to focus on: the roof (or the attic), the walls, the doors and windows, which together represent four 65% heat loss of a home!
In terms of budget, plan between 2000 and 5000 € for the insulation of the attic, and on average 4000 € for double glazing. For about 35% of energy saving!
2. For heating. To replace an old and energy-intensive heating system with an ecological heating, we can opt for systems like boilers (with wood, condensation, mixed), heat pumps or wood stoves, which use renewable energies in addition to be clean.
In terms of budget, plan around 4000€ for a condensing oil boiler, 10 000 € average for an air / water heat pump, and in 1500€ for a wood stove.
3. For ventilation. Often, setting up a VMC is enough, but you can also install a Canadian well to improve the quality of the air.
In terms of budget, count on average 700€ for a dual stream VMC system.
Obviously, this work will often be cumulated, to maximize the energy performance of housing and our savings.
On average, to move from an energy-intensive housing (label G according to the DPE) to a more economical housing (label D, between 151 and 230 khW / m² / year), it would take between 10 000 and 30 000 € of work (especially insulation work on walls and ceilings, and changing the boiler).
In order to move to a very economical housing (label B for example), it will be necessary to review the insulation of all the parts of the house (from the roof to the floor while passing by the windows) and to opt for the most ecological heating systems. For a budget between € 25,000 and € 50,000.
Of course, this represents a very important investment, which can be relieved with national aid (PTZ eco, CIDD, ISCED...), but also the local eco-renovation aid that can be used via our region or the Department.