The best way to insulate windows in classic homes is to install double glazing in the existing window frames. 

Renover is a Belgian renovation company specialised in installing double glazing in existing window frames, insulating your house or apartment without fully replacing the windows.

The most effective way to keep your home cooler without air conditioning is to block the sun's heat before it enters. 

A large share of indoor heat is caused by sunlight coming in through the windows. Solar-control glass effectively blocks that solar heat while still letting daylight through. This keeps your interior pleasantly cool without losing natural light or using energy. The glass can be fitted into existing window frames, requires no maintenance and also insulates in winter, lowering your heating costs. 

Unlike shutters, screens or curtains, it is an invisible and permanent solution.

To determine this, we look at the general condition of the windows, how well they close and whether the load-bearing capacity is already sufficient for double glazing. 

If the windows are already suitable, or become suitable after restoration or repair by our carpenters, double glazing can be installed in the windows without any problem, without altering their appearance or reducing the amount of incoming light. 

If the windows are in too poor a condition, we will also tell you so during the site visit for the free quote.

Yes, double glazing can be installed in existing window frames without replacing the entire window. Since 1976, Renover has applied a unique installation and renovation technique for this in Belgium, allowing owners to modernise their window glass without demolition work or high replacement costs.

Most of the properties for which our services are requested date from the period between 1880 and 1985: town houses, art nouveau and neoclassical houses, interwar terraced houses, mansions, classic terraced houses and apartments, rural homes and historic buildings.

Shop windows are also among the window renovations we carry out. 

We apply the same method here: thoroughly inspecting the condition of the existing display windows and/or the smaller shop panes, after which the new double glazing can, following any renovation, be installed without any problem, regardless of the shape or layout of the window profiles.

Yes, existing windows can also be renovated in apartments. As the owner of an apartment or apartment building, you can call on our services to install double glazing in the existing window frames of your apartment(s) in Brussels, Flanders and Wallonia, for the desired insulation and greater acoustic comfort.

Double glazing in existing windows offers the same energy and acoustic benefits as double glazing in new windows. It provides better thermal insulation, less heat loss in winter and better protection against the heat in summer, lower energy costs and greater sound insulation.

No, full replacement is often not necessary. In most cases, double glazing can be installed in existing window frames without any problem.

Renover is active in Brussels, Flanders and Wallonia. We install double glazing in existing window frames and carry out window renovations in homes, apartments and commercial premises throughout Belgium.

The price depends on the chosen type of double glazing, the dimensions and the current condition of the window frames.

Installing double glazing in existing windows is usually more cost-effective, and the work is less invasive than fitting new windows. You will receive a free, tailored quote so you can see the difference for yourself.

We offer tailored solutions for homes, apartments and commercial premises.

Double glazing significantly reduces heat loss, which lowers energy costs. 

By making your home more energy-efficient with the installation of double glazing in existing window frames – our speciality for 50 years now – you save even more.

Yes, double glazing can also be installed in existing window frames in older homes.

Thanks to the unique Renover process, the windows of more than 10,000 classic properties have already been fitted with double glazing.

As a specialist in window renovation, we carry out the necessary repairs without fully replacing the original window structure.

Installing double glazing in existing window frames can, depending on the project, usually be carried out quickly, often in a single day.

The work is less invasive and just as efficient as fitting new windows. This applies to homes, apartments and commercial premises in Flanders, Brussels and Wallonia.

Yes, double glazing reduces noise nuisance from outside. 

Renover installs insulating double glazing in existing window frames to improve both thermal and acoustic comfort.

In most cases, no demolition work is needed. 
However, restoration work may be required to guarantee the sturdiness and proper closing of the existing windows. This way, we install double glazing in existing window frames without any demolition work.

In Belgium, there are grants for energy-saving renovations. Our window renovation contributes to better insulation; we will gladly inform you about the applicable grants and subsidies you can make use of.

High-efficiency glazing is a type of double glazing with improved insulation values.

During our home visit, we will gladly advise you on the most suitable glass for your existing window frames, meeting your insulation and acoustic requirements.

Yes, wooden windows are extremely suitable for the installation of double glazing in existing window frames.

Has time already taken its toll on your wooden windows? As a specialist in window restoration, we restore your windows to good condition and ensure they are fully ready for the correct installation of the double glazing.

You can rely on our many years of experience in installing double glazing in existing windows and carrying out window renovations in various types of buildings.

Installing double glazing in the existing windows of listed buildings is possible without altering their original appearance.

We analyse each project to check whether installing double glazing in the existing window frames is technically feasible, and we carry out the necessary restoration work to make it possible.

Yes, better insulation and energy efficiency can increase the value of a home, including for older properties.

By replacing single glazing with double glazing in the existing window frames and renovating the windows where necessary, you save money, preserve the authentic appearance of your home and increase its value.

Correctly installed double glazing in existing windows has the same lifespan as that of new windows.

To guarantee this quality, we restore the original windows where necessary. The old rebates are adapted, new sealing joints are installed and the sturdiness of the window frames is checked.

In this way, we install the glazing in existing window frames to high quality standards to ensure long-lasting performance.

Yes, single glazing can be replaced with double glazing in existing window frames.

This solution offers numerous advantages: the unique appearance of your façade is preserved, little or no demolition work is required, the cost is more affordable, you lose no natural light, and you enjoy the same benefits as double glazing installed in new windows.

Window renovation is often faster, less invasive and more cost-efficient.

After restoration, your windows are ready to receive double glazing. This is the ideal solution for those who wish to preserve the authentic character of their home while enjoying the benefits of double glazing.

Yes, double glazing reduces condensation thanks to the better thermal insulation.

Are you experiencing condensation on your current windows but would rather not replace your window frames entirely? We offer the installation of insulating glazing in your existing window frames to reduce condensation and improve your comfort within your home.

With more than 10,000 completed projects and 50 years of experience, we are the Belgian expert in window renovation and the installation of double glazing in existing windows.

We attach great importance to the quality of service when installing double glazing in your existing window frames, as well as to the restoration of those frames. Window frame renovation is our speciality.