Why choose Avenir Renovations?
Tired frames, a weak point often underestimated
Windows contribute to heat loss in a house, but also to the comfort felt room by room.
A glazing that no longer insulates
Single glazing or double glazing from the first generations: the inner surface of the glass remains cold. You can feel it when you sit near the window, and condensation forms there as soon as the air is a bit humid.
Current high-performance glazing keeps the inner surface much warmer. Comfort changes, even before looking at the bill.
A frame that no longer closes properly
Wood that has warped, yellowed PVC with hardened seals, worn hardware: air and sometimes water pass between the opening and the frame.
Over time, infiltrations damage the sill, the plaster around the bay, and sometimes the floor.
A home that breathes poorly
Changing frames makes the house more airtight. This is intentional, but humid air must then be expelled in ways other than through leaks. Air intake grilles integrated into the frames and extraction in humid rooms prevent condensation from migrating to the walls.
Our frame solutions in Leuven
The choice of your frames in Leuven depends on the desired performance and the style of your home. Glazing and materials are selected according to your needs.
Why entrust your frames to Avenir Renovations in Leuven?
Avenir Renovations supports you in the replacement of your frames in Leuven with precision and expertise. Each installation guarantees insulation, watertightness, and careful finishes.
Measurement, plumb, condition of the support and lintel, presence of a hollow wall: each opening is examined. We also anticipate access constraints for large bays in narrow streets.
The performance of a frame depends as much on its installation as on its manufacturing. Continuous sealing, clean joints, careful adjustments: this is what guarantees the absence of drafts and infiltration.
Repair of the plaster around the bay, new sill, finishing joints: all this is included in the estimate. The room is clean and usable the same evening, and you have no small jobs to organize after our visit.
What is the price of a frame installation in Leuven?
Material, size, glazing, and installation method determine the final amount. For details on the items, see our page dedicated to the price of window installation. The ranges below include VAT at 6% (housing over ten years old).
| Type of work | Factors affecting the price | Indicative price including VAT |
| PVC double glazing HR frame (standard window) | Dimensions, tilt-and-turn or fixed opening, color | 550 to 950 € / unit |
| Wood double glazing HR frame | Wood type, finish, original profiles to reproduce | 900 to 1,500 € / unit |
| Aluminum double glazing HR frame | Profile thickness, colors | 850 to 1,400 € / unit |
| Triple glazing supplement | Glazed area, weight of openings | 60 to 120 € / m² of glazing |
| Acoustic or safety glazing supplement | Requested level of protection | 50 to 150 € / m² of glazing |
| French door or sliding door to the garden | Width, flat threshold, number of leaves | 1,800 to 5,000 € / unit |
| Integrated air supply grille | Length, manual or automatic adjustment | 80 to 200 € / grille |
The type of installation, whether renovating on the old frame or complete removal, is decided on-site after examining the masonry. You will then receive a window-by-window estimate, with options separated.
Example: for a terraced house in Heverlee with eight windows and a French door to the garden, a complete replacement in high-performance PVC double glazing often costs between 9,000 and 13,000 euros including VAT, with interior finishes included.
Procedures and grants for replacing frames in Leuven in 2026
The Flemish grant for glazing
In 2026, Mijn VerbouwPremie for glazing is reserved for income categories 3 and 4, those of the most modest incomes. The glazing must achieve a minimum performance, around a Ug coefficient of 1.0 W/m²K, which corresponds to current high-performance double glazing. Technical sheets are attached to the invoice to constitute the file.
Reduced VAT and EPC label
The VAT rate of 6% remains applicable for homes over ten years old, without income conditions. For a property purchased with an E or F label, the frames often form part of the package of measures that allows reaching the D label, along with the insulation of the roof and walls.
The permit to replace frames
Replacing frames while keeping the dimensions of the openings and the appearance of the façade generally does not require any authorization. If the divisions, color, or material change significantly on the street side, or if the building is listed in the heritage inventory, a check is necessary before ordering.
In a condominium
In a building, the frames often form part of the common appearance of the façade. The condominium regulations may impose a shade, material, or design, and sometimes the agreement of the general assembly. It is better to check this before signing the order form.
Glazing, ventilation and organization of replacement
Double or triple glazing
Triple glazing insulates better, but it is heavier and more expensive. It is justified on north-facing facades, in a highly efficient house, or when noise is significant. For most renovations, high-performance double glazing remains a very good choice.
Well-placed air intake grills
In living spaces without other air supply, integrated grills at the top of the frame ensure minimal air renewal. Discreet and adjustable, they close during strong winds and do not create drafts at the level of people.
A possible frame replacement in winter
Each window is removed and replaced within the day, the room is never left open. Cold does not hinder sealing if the products are suitable.
We organize the order of rooms with you: bedrooms in the morning so they are closed well before evening, the living room last if you are working from home.
Recycling of old frames
They are removed and sorted: glass, wood, PVC, and aluminum each follow their recycling stream. Old painted wooden frames, sometimes lead-painted in very old houses, are treated separately.
A real acoustic gain
Noise significantly decreases compared to old single glazing or worn seals. For a bedroom facing a roadway or railway, acoustic laminated glazing further improves the result.
Change everything or proceed by facade
You can start with the most exposed facades or the most used rooms. However, replacing everything at once remains more economical, with a single measurement, a single delivery, and perfectly identical shades.
Frequently asked questions about frame installation in Leuven
What is the best material for frames in Belgium?
There is no absolute best material. PVC offers the best performance-price ratio, aluminum has the thinnest profiles and the longest maintenance-free duration, and wood has the most suitable charm for old houses in central Leuven.
How long do new frames last?
Quality PVC or aluminum frames easily last thirty to forty years. Wood can last just as long if it is regularly repainted or refinished. Seals and hardware can be replaced in the meantime without changing the frame.
Should frames be replaced before or after wall insulation?
If external insulation is planned, both should be coordinated: new frames are then installed in the plane of the insulation. With a simple injection of hollow walls, the order matters little.
Do new frames cause condensation?
Not on the glass, which remains warmer. But a more airtight house retains more humidity: without air intake grills or extraction in humid rooms, condensation can migrate to cold walls. That is why ventilation should be planned with the replacement.
Order your frames at the right time
Between the validation of the survey and the installation, generally count on six to ten weeks of manufacturing. The installation itself takes only one to three days for a complete house, without leaving the openings open at night.
For frames installed before winter, the ideal is to start the project before the end of summer. The survey visit is free.
Agency Avenir
Rénovations
for Installation of frames in Leuven
An expert to take charge of your renovation projects and guarantee deadlines, budgets and quality of all services.
