Installation and replacement of frames in Liège

Installation: the essential invisible that changes everything

Even the best window disappoints if the installation and sealing are neglected. Our method standardizes the key points: preparation of the frames, multi-level sealing, suitable fixings, and clean finishes. You feel the difference from the first weeks: no air drafts, smooth operations, properly managed water runoff.

Frame preparation & controlled removal

• Removal of old frames cleanly (protection of surroundings, disposal), support check (brick, concrete, lining).
• Leveling and flatness of the frame, checking supports and water drainage.

Sealing "3 levels" (air/water/insulation)

• Exterior: protection against driving rain (strip/membrane + compatible sealant).
• At the frame: continuous insulation (foam/cord) to break the thermal bridge.
• Interior: air barrier to stop air infiltration.

Fixings, adjustments & finishes

• Suitable anchors, alignment of frames, uniform compression of seals.
• Clean interior cladding, well-finished low thresholds, well-profiled supports and water drainage.

Condominium & visible facade

• In apartments, the facade is often common property: imposed color/divisions, agreement syndic/AG required.
• Protection of common areas (elevator, corridors), delivery slots, neighbor information.

Urban Planning, Energy Performance & Co-ownership (Liège / Wallonia)

Identical replacements in houses are generally exempt from permits; a change of appearance (color, window division, visible material) may require a DUP or a PU. In apartments, as the facade is often common, the decision of the syndic/AG prevails; we prepare the file (colors, divisions, sheets). 

Regarding energy performance, the gains from the frames are maximized if they fit into a coherent energy pathway with insulation and ventilation; we document the performances (Uw, Sw) and the proofs of implementation required.

Why choose Avenir Rénovations Liège?

You entrust your project to a team that knows the Liège building and its constraints: shared walls, alley access, blue stone supports, demanding co-ownerships. Our added value lies in a rigorous installation, neutral advice on materials/glass, and neat finishes on the interior/exterior.

• Turnkey service: measurements, ordering, installation, coordination with other trades, waste management.
• Controlled quality: checklists, maneuver tests, verified sealing, careful finishes.
• Transparency: detailed quotes by lots, readable variants, phased schedule.
• Co-ownership: protections for common areas, adapted slots, communication syndic/AG.
• After-sales service: subsequent adjustments, replacement of hardware, seals, glass.

Frequently Asked Questions

Before making a decision, we often wonder which material to choose, how to limit noise, whether triple glazing is useful, and what steps to take. This FAQ provides practical answers for housing in Liège or elsewhere in the province, with directly applicable responses.

PVC, aluminum or wood: which material for my case 

 PVC is suitable for the majority of homes: insulating, economical, low maintenance. Aluminum is preferred for large openings due to its rigid profiles and fine aesthetics; it lasts very well over time. Wood offers a warm appearance and good thermal performance, ideal for traditional facade renovation; periodic maintenance is required. We match your criteria (look, budget, noise, exposure) with facade regulations and the context (house/apartment) to propose the best combination.

Double or triple glazing: which is more relevant?

The current double glazing is very efficient and often sufficient. Triple glazing is justified in facades that are very exposed to cold/noise, with an ambitious energy goal — taking into account weight and brightness. In noisy streets, a well-chosen double acoustic laminated glass can be more comfortable than a standard triple. The key is to adapt the glazing to the structure and ventilation.

How to avoid “drafts” after installation?

Everything depends on three-level sealing and adjustments. Outside: protection from driving rain. At the frame: continuous insulation. Inside: air barrier. We also address water sills/drainage and continuity with the linings (Gyproc/Fermacell). The result: stable comfort in winter/summer, without drafts.

What precautions in a condominium?

Since the facade is often common, material, color, and division may be imposed. We prepare a file for the property manager, protect the common areas, organize deliveries, and display the schedule in the building. The goal: a calm and compliant installation, without surprises.

Are roller shutters always useful?

Very useful for summer comfort, darkening, and perceived security. On South/West openings, they complement solar control glazing. We offer renovation solutions (external boxes) or integrated, manual or motorized, depending on the budget and desired aesthetics.

Can I benefit from the 6% VAT?

Yes, as part of a renovation of a more than 10 years old home occupied privately and carried out by a contractor; we check the eligibility and provide the required documents with the quote and invoice.

Are you planning to replace your frames in Liège?

Benefit from a clear advice, a detailed quote, and a flawless installation by local teams.

Contact Avenir Rénovations Liège to get your study and estimate, and enjoy high-performance, aesthetic, and durable openings.