1 - Thermal insulation work
Carrying out thermal insulation work can achieve up to 80% reduction in heating expenses. The total budget depends on the elements to be treated. External insulation (facade) will cost between 115 and 230 euros per m². For internal insulation, budget between 35 and 105 euros per m².
If you choose insulation for attics (converted or not, under the roof, from the inside or in sarking), an amount ranging from 20 to 290 euros per m² will be necessary. For the insulation of floors and slabs, expect between 35 and 170 euros per m².
Price variations for these energy renovations depend in particular on the insulations used (mineral wool, wood fiber, blown cotton...).
2 - Roofing work
The cost of roof insulation varies depending on the chosen technique (sarking or internal insulation), the type of insulation, the condition of the covering, and the desired performance. To undertake your roof insulation, you should budget between 50 and 460 euros per m². For an accurate budget estimate, you can perform a free simulation using the tool provided by Avenir Rénovations.
3 - Heating / air conditioning system installation work
The replacement of an old heating system helps reduce your energy bills while minimizing environmental impact. But how much does it really cost? Here is a table summarizing the Belgian prices for the installation of various heating equipment.
| Type of equipment |
Average cost |
Installation and setup price |
| Air-to-air heat pump (PAC air-air) |
From 1,610 € |
From 1,865 € |
| Air-to-water heat pump |
From 10,350 € |
From 4,765 € |
| Condensing boiler |
On average 4,025 € (generally gas) |
Between 575 and 3,450 € |
| Thermodynamic water heater |
From 2,300 € |
From 2,185 € |
| Pellet stove |
Between 2,875 and 9,200 € |
From 1,805 € |
| Wood stove |
Between 575 and 17,250 € depending on style, power, and fuel |
Between 1,150 and 8,050 € |
The integration of solar panels also significantly reduces electricity expenses. If you choose a solar boiler, its price generally ranges between 5,000 and 7,000 euros. Mixed solar installations have a cost between 14,000 and 18,000 euros. For a photovoltaic system, you should budget between 9,000 and 30,000 euros on average, depending on the desired power.
4 - Implementation of a ventilation system
With solutions ensuring continuous air renewal, the installation of a ventilation system provides optimal air quality in the home. For a double flow VMC, the budget typically ranges between 8,600 and 21,800 euros. If you choose a regulated positive ventilation (VPH), budget between 2,180 and 4,830 euros. For a mechanical ventilation by insufflation (VMI), expect to pay between 2,180 and 5,750 euros for commissioning. Finally, for installing a single flow VMC, you should budget between 575 and 1,950 euros on average.
5 - Installation of joinery
The cost for the installation or replacement of joinery varies depending on the type of opening, the chosen material, the dimensions, the number of units, and the performance of the glazing. Generally, for the replacement of a front door, the budget ranges from 920 to 4,950 euros (including labor and materials) depending on the model. For the replacement of windows or skylights, expect starting from 345 euros per unit.
If you wish to add a roller shutter, budget between 1,035 and 1,150 euros for the purchase of the system. Installation rates vary by company. Do not hesitate to request a personalized quote from Avenir Rénovations for your joinery installation.
