Why choose Avenir Renovations?
Why ventilate your home?
A family of four produces several liters of water vapor every day while cooking, showering, or simply breathing. This humidity must escape.
Breathe healthier air
Continuous ventilation removes humidity, carbon dioxide, odors, and compounds emitted by furniture and cleaning products. In a closed bedroom at night, the difference is felt upon waking.
Protect the house from humidity
Condensation on windows, mold in corners, peeling wallpaper, musty smell: these issues recede as soon as humid air is extracted where it is produced, in the kitchen, bathroom, and laundry room.
In recently insulated homes, this is often the first problem that ventilation solves.
Limit heat loss
Opening windows wide in winter lets heat escape. A properly sized ventilation system renews the air at the right flow rate, and the double flow recovers most of the heat from the extracted air to warm the fresh air.
Ventilation systems
Several ventilation systems allow for the renewal of indoor air and limit humidity in your home. The choice depends on your housing, your needs, and your budget.
Consumption, integration, and comfort
A well-designed ventilation system renews indoor air while limiting electricity consumption and drafts. Its installation adapts to the characteristics of your home.
Current DC fans consume little, about the same as one or two continuously lit bulbs. Demand-controlled regulation further reduces this consumption, which generally amounts to a few dozen euros per year.
A complete system is not always necessary. At a minimum, there should be air intake grilles in living areas and effective extraction in the bathroom and kitchen. The situation is assessed room by room.
Air supply grilles are placed at the top of frames or walls, so that fresh air mixes before reaching people. The extraction vents are adjusted room by room during commissioning.
What is the price of a VMC in Leuven?
The chosen system, the number of vents, the length of the duct layout, and the finishing work determine the amount. The amounts indicated include the 6% VAT applicable to a house over ten years old.
| Type of work | Factors affecting the price | Indicative price including VAT |
| Single flow VMC (3-bedroom house) | Number of vents, location of the unit | 2,500 to 5,000 € |
| Demand-controlled single flow VMC with sensors | Number of humidity or CO2 sensors | 3,500 to 6,500 € |
| Double flow VMC with heat recovery | Length of the network, available space for the unit | 7,500 to 14,000 € |
| Compact single flow VMC for apartments | Facade outlet or connection to a duct | 1,800 to 3,500 € |
| Air supply grilles added to existing frames | Type of frame, adjustment | 80 to 200 € / grille |
| False ceiling or box for duct passage | Surface area, finish | 40 to 90 € / m² |
| Annual maintenance and filter replacement | System, access to the unit | 120 to 250 € / year |
During the visit, we draw the duct layout and choose the location of the unit with you. The quote follows, vent by vent.
Example: for a row house in Wilsele that has just been insulated, a demand-controlled single flow VMC with extraction in the kitchen, bathroom, toilet, and laundry room, and grilles in the frames of the living areas, often costs between 4,000 and 6,500 euros including VAT.
Where to run ducts in an existing house?
This is the real question in renovation. In a row house in Leuven, the attic is generally used, a technical duct created in a closet, false ceilings in hallways, or a discreet box along a wall.
- Extraction: kitchen, bathroom, toilet, laundry room
- Supply air: living room, bedrooms, office
- Unit: attic, laundry room, or basement, accessible for maintenance
The layout is decided on-site, room by room, to limit visible casings.
A well-chosen unit is also very quiet. It is avoided to place it against a bedroom and silencers are added on the ducts when necessary.
Simple but regular maintenance
A ventilation system only works well if it is maintained. Extraction vents are cleaned twice a year, filters of a double flow are replaced once or twice a year, and a check of the unit every two or three years allows for verifying the flow rates. These actions take little time and preserve both air quality and the lifespan of the installation.
Procedures and assistance for ventilation in Leuven in 2026
Ventilation requirements during a renovation
In Flanders, a renovation requiring a permit that affects the envelope, for example by replacing frames or creating a new volume, is generally accompanied by minimum ventilation requirements. Specifically, this translates into air intakes in living areas and extraction in wet rooms.
Ventilation without a grant, but with reduced VAT
Ventilation is not part of the Mijn VerbouwPremie items in 2026, but it benefits from a VAT rate of 6% under the same conditions as other work carried out in a home over ten years old. It remains an essential complement to insulation work, which is subsidized for income categories 3 and 4.
Rented housing and condominiums
For a rented property, adequate ventilation is part of the Flemish quality standards, especially in student rooms and studios. In condominiums, a facade outlet or connection to a common duct requires the agreement of the general assembly.
Why choose Avenir Renovations?
- Choice of system according to your house and ongoing work
- Dimensioning of airflows room by room
- Discrete integration of ducts, coordinated with plasterer and electrician
- Adjustment and balancing upon commissioning
- Maintenance advice and filter replacement
Poorly adjusted ventilation makes noise, consumes too much, or does not extract enough: this is why final balancing is as important as the equipment.
Frequently asked questions about VMC in Leuven
Does a VMC help with allergies?
A double flow ventilation system filters fresh air and retains a good portion of pollen and fine dust. Any VMC also reduces indoor humidity, which limits the development of dust mites and mold. The filters must then be replaced regularly.
Does a VMC prevent opening windows?
No. It ensures a permanent air renewal, but nothing prevents you from airing out when you wish. In summer, opening windows at night remains the best way to cool the house.
Where to exhaust air extracted by a VMC?
On the roof or facade, away from windows and fresh air intakes, so that the stale air is not re-aspirated. In a terraced house, outlets directed towards the garden or the neighbor's windows should be avoided.
How long does it take to install a VMC?
A simple flow system generally installs in two to four days, including finishing touches. A double flow system typically takes one to two weeks, especially if false ceilings need to be created for the ducts.
No more condensation on windows
Well-adjusted ventilation is mainly noticeable by what disappears: morning condensation, musty odors, black marks in the bathroom.
Request your free study. We will look at your house, your recent or planned work, and propose the suitable system.
Agency Avenir
Rénovations
for Installation of MVHR in Leuven
An expert to take charge of your renovation projects and guarantee deadlines, budgets and quality of all services.
