Installation of sliding glass doors in Woluwe-Saint-Lambert

Our sliding glass door solutions

–  Classic sliding glass door, with one or more tracks

–  Pocket sliding glass door, completely disappearing into the wall

–  Fixed glass door combined with a side opening

–  High thermal and acoustic performance glazing

–  Flat threshold for step-free access to the terrace

–  Motorization and integrated roller shutter available as an option

Large bay window and extension project: a common combination

Many homeowners take advantage of a home extension project to completely rethink the opening of their living room towards the garden.

Extension with large panoramic bay window

A rear extension is often an opportunity to install a bay window across the entire width of the new room, creating a living space that is largely open to the garden and filled with natural light.

Spot replacement without extension

Without an extension, replacing a simple window with a sliding bay window is already enough to significantly transform the brightness and perception of space in an existing room.

Coordination with the insulation of the surrounding wall

When the bay window replaces a smaller opening, the insulation of the surrounding wall is often reviewed at the same time to ensure consistent thermal continuity across the entire affected facade.

Which glazing to prioritize according to orientation?

The choice of glazing deserves special attention, as the actual thermal performance directly depends on the exposure of the facade involved in the project.

South-facing facade, priority on solar protection

Solar control glazing limits summer overheating, especially when combined with external protection such as a blind or shutter, without sacrificing the desired natural light input.

North-facing facade, priority on thermal insulation

Without direct solar input, the glazing should prioritize maximum thermal performance to limit heat loss, particularly sensitive on large north-facing glazed surfaces.

VAT and aids for a bay window in Brussels

The 6% VAT applies to renovation work in a home over 10 years old, including the installation of bay windows, under the usual conditions related to the registered contractor and detailed invoicing.

Renolution grants remain suspended for invoices from 2025 and 2026, a decision confirmed by the Brussels government in February 2026. The ECORENO credit, relaunched in early 2026 by the Housing Fund at a reduced rate, remains available if the bay window is part of a broader energy renovation project for the facade.

Why choose Avenir Rénovations for your bay window?

Expertise on load-bearing walls

We never propose an ambitious opening without prior structural study, which avoids unpleasant surprises once the work begins and ensures the safety of the building.

A choice of truly high-performance glazing

We guide you towards glazing suited to the orientation of the facade, to avoid summer overheating while maximizing useful solar gains in winter.

Complete coordination of the project

Structure, carpentry, interior and exterior finishes are coordinated by a single team, which avoids delays and misunderstandings common between several independent trades.

A result consistent with the rest of the house

Shades, proportions, and materials are chosen to harmoniously integrate with the existing facade, rather than imposing a standardized opening without consideration of the overall style of the building.

Permits and structural feasibility

Replacing an existing opening of the same size generally does not require any procedures, unlike creating a new opening or making visible changes to the facade. Installing a sliding glass door in a load-bearing wall is still possible, provided there is a prior technical study and the installation of an appropriate load-bearing beam, with our teams managing the removal, structural reinforcement, and installation in compliance with standards. Combining several small windows into one large bay is also feasible, provided that the structure of the concerned wall is studied beforehand: this operation often requires more significant structural reinforcement than simply replacing an existing opening.

Materials, thermal comfort, and installation time

Aluminum, PVC, or mixed wood: each material has its own advantages, and the choice is made according to the budget, the intended use of the room, and the architectural style of the house. A sliding glass door remains compatible with a low-energy home, provided that high-performance glazing and good air tightness are chosen, complemented by suitable solar protection on the south facade to avoid any summer overheating; a shutter or a blind is indeed strongly recommended on a south-facing facade. In terms of time, expect two to three days for a pocket sliding door or in a load-bearing wall, with finishing, coatings, and thresholds potentially requiring an additional one to two days depending on the complexity of the project.

Open your living room to the garden

A well-designed sliding glass door permanently transforms the brightness of a living room, in Georges Henri as in other neighborhoods of Woluwe-Saint-Lambert. The initial structural study remains the first essential step before any final costing.

Also discover our shutter installation solution or our architectural house renovation solution for a coherent opening project.