Energy renovation in Namur

Common cases in Namur: our responses

1) 1930s terraced house: cold in winter, hot in summer

Observation: poorly insulated roof, solid walls, old frames, steam and odors in kitchen/bathroom.

Our response:

• Roof/sloped insulation (two crossed layers) + continuous vapor barrier,
• Single flow ventilation with extraction from humid rooms,
• High-performance frames (acoustic on the street side if necessary) + sealing 3 levels,
• Regulation and balancing of radiators. 

Result: feeling of a homogeneous room, windows without condensation, noise reduced on the street side, usable attic in summer.

2) 4 facades from the 70s: hollow walls and high bills

Observation: presence of a cavity, poorly insulated attic, “set high” boiler.

Our response:

• Cavity wall injection after surveys,
• Attic or under-roof insulation,
• Programmable thermostat and balancing,
• Recommendation for solar shading on South/West facades.

Result: warmer walls, radiators less stressed, stable temperatures.

3) City center apartment: noise disturbances & polluted air

Observation: street noise, dated windows, no extraction in bathroom/WC.

Our response:

• Frames with laminated acoustic glazing,
• Discreet extractions in humid rooms,
• Targeted interior lining (if allowed) on sensitive walls,
• Careful joints and air inlets.

Result: reduced noise, quick humidity evacuation, improved nighttime comfort.

4) Overheating under recent roof

Observation: thin insulation, no solar protection, insufficient ventilation.

Our response:

• Strengthening of insulation with materials of better thermal capacity,
• External blinds on roof frames / solar protections for windows,
• Ventilation (or extraction) sized,
• Option for split air/air if the room is heavily used.

Result: less stuffy late afternoons and cooler nights.

The advantages of Avenir Rénovations 

• Clear prioritization : envelope → ventilation → heating.
• Local contractors : knowledge of Namur's buildings (brick, cavity walls, slate/tile roofs).
• Transparent quotes : technical variants, pricing by lots, milestones and schedule.
• Controlled quality : checklists, photos, blower door possible, step-by-step receptions.
• Multi-trade coordination : insulation, frames, MVHR, heating, electricity, finishes.
• Administrative support : urban planning (if facade), technical documents useful for your EPB and the renovation process.

Local procedures, EPB and renovation process 

• Urban planning : interior insulation does not require a permit. ETICS (external insulation) and any modification of facade appearance may require a declaration or a permit : we will inform you and assist with the file.
• EPB : we document the work (technical sheets, implementation photos, insulation performance, measured ventilation flows) so that the gains are recognized.
• Renovation process (Wallonia) : roofing, walls, frames, ventilation and efficient heating often integrate into a structured process (audit recommended/necessary depending on the case, supporting documents). We guide you on the documents to keep and the prioritization of steps.

FAQ – Energy renovation 

What is the most cost-effective first step?

In the vast majority of cases: roof insulation. It is technically accessible, very cost-effective and minimally disruptive if done through the attic. Then, walls (interior/exterior or cavity walls), frames, ventilation, and then heating/regulation.

Single flow or double flow MVHR: which to choose?

The single flow reliably and economically renews the air. The double flow recovers heat and further improves comfort. The choice depends on the configuration, the tightness of the envelope and the ease of running the networks. We compare the investment and the expected savings.

Is a heat pump always a good option?

It is especially beneficial in a well-insulated and ventilated house with low temperature emitters. Otherwise, a condensing boiler or a hybrid system may be more relevant. We size to the actual need (no oversizing) to avoid unnecessary expenses.

Is triple glazing essential?

Not necessarily. It is useful on highly exposed facades and in an ambitious EPB trajectory. In urban areas, double with laminated acoustic can offer superior comfort. We adapt orientation by orientation.

How to avoid condensation and mold after insulation?

By ensuring air tightness, the continuity of the vapor barrier and ventilation (measured flows, tight networks). Result: warmer walls, healthier air and sustainable performance.

Can I stay in the housing during the work?

Very often yes. We phase by zones, limit dust and noise, and maintain a functional water room if possible. For heavy tasks (ETICS, major roofing projects), we adjust the logistics.

Do you want to improve the energy performance of your house or apartment in Namur?

Benefit from a clear study, a detailed quote, and stress-free coordination until completion.

Contact Avenir Rénovations Namur to start your energy renovation.