Renovation works in Liège

Materials, Quality, Compatibilities (Belgium version)

The final quality depends on compatible systems and brands available locally. We prioritize:

• Suitable insulations (mineral wool/wood, PIR/PUR, cellulose, EPS/XPS) according to use and summer comfort.
• Frames & hardware from professional ranges; glazing with Ug consistent with the PEB objective.
• Gyproc/Fermacell partitions and compatible coatings; suitable bonding primers.
• Professional paints distributed in Belgium (Levis, Trimetal, Sigma, Sikkens, Mathys).
• Local suppliers (sanitary, tiles, carpentry) for after-sales service and quick spare parts.

Common Issues Encountered in Liège

We address these points as a priority to avoid "band-aid" solutions.

• Infiltrations & porous facades: masonry repairs, compatible repointing, careful supports and cappings.
• Condensation & mold: continuity of air barrier, recalibrated ventilation, correction of thermal bridges.
• Drafts and street noise: installation of high-performance frames + continuous sealing.
• Flatness & squeaks of floors: reinforcements, resilient underlays, wise choice of coverings.
• Overheating in attics: continuous roof insulation + solar protections on roof frames.

The Advantages of Avenir Rénovations

You gain peace of mind and predictability thanks to a structured organization.

• Single point of contact and itemized quotes with clear options.
• Realistic planning: phasing of living spaces, controlled coactivity.
• Measurable quality: checklists, implementation photos, interim controls.
• Clean site: protections, waste disposal, daily cleaning.
• Local after-sales service: adjustments, touch-ups, retained product references.

Urban Planning Procedures & Co-ownership (Liège / Wallonia)

Before any visible modification from the street (colors, ETICS, frames, openings), a Prior Urban Planning Declaration (DUP) or a Building Permit (PU) may be required. 

In co-ownership, facade, roof, drainage column, and technical ducts are common areas: a syndic/AG vote is necessary. We prepare clear documents (plans, descriptions, colors, schedule), organize signage in case of sidewalk encroachment, and respect access/hours instructions.

Grants & access to grants (Wallonia – 2025-2026)

Your work may fall under the temporary scheme of Housing Grants (until 30/09/2026). In most cases, a Housing audit by a certified auditor is the entry point: it recommends eligible items (insulation, frames, ventilation, heating).

• Amounts varied according to income category (R1 → R5), through a multiplier on a base amount.
• Exceptions: certain roof items and roof insulation can be initiated without prior audit (technical verification to be done on a case-by-case basis).
• File: detailed quote, photos before/during/after, technical sheets, and compliance with related works when the auditor links them to the same wall.
• Additional financing: Rénopack/Rénoprêt (zero-interest loans) depending on the situation.

Good to know: for a private dwelling over 10 years, 6% VAT may apply (conditions).

FAQ

Where to start a house renovation in Liège?

With a global diagnosis that prioritizes: envelope (roof, insulation, frames, air tightness) → ventilation → systems (heating, regulation) → finishes. This logic avoids rework and improves the PEB at controlled cost.

Annex or storey addition: what are the practical differences?

An annex (ground floor extension) requires excavation, foundations, and connections to the existing structure; the storey addition involves structure/roof. Urban planning differs (DUP/PU), as do access/scaffolding costs. We size the project before estimating.

Interior insulation or insulating facade (ETICS)?

Interior is modular room by room and practical in apartments; ETICS eliminates more thermal bridges and renews the facade, but often requires an urban planning process. We compare based on your street, your frames, and your schedule.

Should we replace the frames before or after the ETICS?

Ideally before or at the same time, to manage the 3-level sealing and the continuity of the insulation. This avoids rework on supports and residual thermal bridges.

Can we live in the dwelling during the works?

Most often, yes, thanks to the phasing of areas (living rooms, bedrooms, bathrooms). We organize protections, circulation, and time slots to limit disturbances.

How long for a complete renovation?

Depending on surface/state/access, expect 4 to 12 weeks for a major renovation (excluding specific supplies). A detailed schedule is provided with the quote.

Need a construction partner in Liège?

Benefit from a clear study, a detailed quote with readable options, and a meticulous execution by local teams.

Contact Avenir Rénovations Liège to structure your project, keep to the schedule, and deliver a sustainable and compliant renovation.