Why choose Avenir Renovations?
A poorly designed sliding door can harm comfort and energy efficiency
If it is poorly oriented, not well insulated, or poorly installed, a sliding door can become a significant source of thermal loss, even causing summer overheating. This is why it is essential to carefully consider the replacement or installation of a sliding door as part of an energy renovation.
Heat loss in winter
Old sliding doors, often single-glazed or with uninsulated metal frames, allow cold air to pass through. The result: degraded comfort, condensation, and overworked heating.
A high-performance glazing limits losses and helps reduce the energy bill of the home.
Overheating in summer
Poorly protected or poorly oriented, a sliding door can create an unpleasant greenhouse effect, especially in south-facing living rooms. Therefore, it is important to consider orientation, solar protection, and ventilation.
Adding an exterior shade, sunbreaker, or solar control glazing is often recommended to maintain indoor freshness.
Opening difficulties and reduced security
Aging sliding doors can get stuck or open with difficulty. Additionally, an old sliding door is more vulnerable to break-in attempts.
New models are equipped with multi-point locks, burglary-resistant glazing, and anti-removal systems for enhanced security.
The best solutions for a high-performance sliding glass door
At Avenir Rénovations, we help you choose and install a sliding glass door that combines aesthetics, comfort, and energy efficiency.
Why choose Avenir Rénovations for your sliding glass door?
Choosing Avenir Rénovations means benefiting from complete technical expertise, personalized support, and impeccable results.
We analyze exposure, the structure of the load-bearing wall, interior/exterior circulation, and your needs for light or accessibility. This allows us to define the right dimensions, the right material, and the best opening.
We also advise you on solar protections, accessibility standards, and connections with insulation or flooring.
Our teams ensure a careful installation with:
- Perfect air and water tightness
- Appropriate peripheral insulation
- Recessed threshold if desired (access for people with reduced mobility or step-free effect)
- Clean finishes both inside and outside
Each project is monitored at every stage to ensure durability, comfort, and safety.
We coordinate the sliding glass door with other elements (heating, insulation, home automation...) to optimize comfort and the PEB score. We also help you prepare a file for any available grants.
How much does a sliding glass door cost in Belgium?
| Type of sliding glass door | Average price including VAT (installation included) |
| PVC sliding glass door | 1,500 to 2,500 € |
| Aluminum sliding glass door with 2 panels | 2,500 to 4,500 € |
| Pocket sliding glass door | 4,000 to 7,000 € |
The price varies depending on the width, glazing, material, number of tracks, and options (integrated shutter, motorization, flat threshold...).
FAQ – Sliding doors and energy performance
Is a permit required to install a sliding door?
Not always. If you replace an existing opening with a sliding door of the same size, no procedures are generally necessary. However, if you create a new opening or modify the facade (especially in a classified area), a planning declaration may be required. We help you check local regulations.
What material should I choose for a well-insulated sliding door?
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Aluminum: thin, rigid, weather-resistant, with thermal break
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PVC: very good insulator, more economical, but thicker profiles
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Wood: aesthetic and naturally insulating, but requires regular maintenance
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Mixed: combines the advantages of wood (interior) and aluminum (exterior)
We help you choose according to your budget, usage, and the style of your house.
Is a sliding door compatible with a low-energy house?
Yes, provided you opt for high-performance glazing (Uw ≤ 1.1 W/m²K) and good air tightness. It is also important to plan for solar protection (shutter, blind, awning) on the south facade to avoid overheating in summer.
Passive solar gain in winter is a real asset, provided you manage peripheral insulation well.
Can a sliding door be installed in a load-bearing wall?
Yes, but this requires a prior technical study. The part of the wall must be replaced with a beam (IPN, reinforced concrete...) to bear the load. Our teams handle the removal, structural reinforcement, and installation in compliance with safety standards.
How long does it take to install a sliding door?
On average, expect:
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1 day for a standard sliding door
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2 to 3 days for a pocket sliding door or in a load-bearing wall
Finishing touches may require an additional one to two days (plastering, thresholds, insulation joints).
Open your home to light with Avenir Rénovations
Installing a bay window transforms your interior into a bright, open, and efficient space.
Trust your project to Avenir Rénovations for a perfectly integrated, durable solution tailored to your needs. Contact us for a free study and a personalized quote.
