Global energy renovation in Haut-Rhin (68)
A global energy renovation involves coordinating several types of work in order to improve the building envelope, ventilation and equipment in a coherent sequence. In Haut-Rhin (68), this approach must take account of very different types of construction: workers’ houses in Mulhouse, old timber-framed buildings, village houses or farmhouses with thick walls. The project therefore goes beyond simply replacing a heating system. It begins with an analysis of the building, its heat losses and its behaviour in relation to moisture, before defining a set of compatible works.
Tip: have your energy performance certificate (DPE) and energy bills to hand for a more accurate estimate.
Why undertake a global energy renovation in Haut-Rhin
In Mulhouse’s workers’ housing estates, party walls reduce some heat loss through the sides, while roofs, gable walls, windows and floors may remain more exposed. A coordinated renovation makes it possible to prioritise these areas rather than treating them separately. In houses built to similar plans, the solutions may follow common principles, while still needing to respect the specific configuration of each property and the external consistency of the street frontage.
Timber-framed buildings in Colmar and the wine-growing towns require a different approach. Timber frames, cob infill or brick infill need walls that can manage water vapour transfer. A solution that is too airtight can disrupt this balance. In rural houses with large internal volumes, wall mass does not replace insulation. Global renovation is therefore used to coordinate the envelope, air renewal and heating system without treating each piece of equipment as an isolated element.
What global energy renovation includes
Assessment of the home’s energy condition
Global energy renovation begins with an assessment of the existing building: wall construction, roof, openings, floors, ventilation and heating or hot-water systems. This analysis helps identify the areas that should be treated first and the possible interactions between them. It also helps avoid replacing equipment too early when it could subsequently become oversized after envelope improvements.
Coherent treatment of the building envelope
Insulation may concern the loft, roof, walls or ground floors depending on the configuration. The choice of materials and method depends in particular on the nature of the walls and their ability to manage moisture. On an old or timber-framed façade, internal insulation may be considered when the external appearance needs to be preserved. Continuity between the different areas is assessed in order to limit weak points.
Ventilation and moisture management
Improving insulation and airtightness changes the natural exchanges within the home. Ventilation must therefore be incorporated into the project in order to remove moisture produced by occupants and renew indoor air. Particular care is needed in older buildings, where walls may have operated for many years with diffuse air exchanges. Air inlets, extract points and internal air circulation are considered together.
Adapting the heating system
Once heat demand has been reduced through work on the building envelope, the heating system can be reassessed. The required output depends on the volume, the insulation achieved, the existing emitters and the operating temperatures. Depending on the property, the project may involve keeping certain components, adapting the controls or considering new equipment. Sizing takes place after assessing the works likely to change heating demand.
Organising a works pathway
A complete renovation does not necessarily mean deciding on every operation without an order of priority. The pathway sets out the work to be carried out, the dependencies between tasks and the technical precautions to observe. It distinguishes in particular between work on the walls and roof, ventilation and systems. This organisation helps avoid having to alter recent work because an important element was not taken into account at the outset.
Typical situations in Haut-Rhin
Terraced workers’ house in Mulhouse
In this type of property, separating walls with neighbouring homes may be less exposed than the gable wall, roof or windows. A global scenario can therefore focus the assessment on surfaces facing outside, check the ventilation and then determine whether the existing heating system remains suitable after improvements to the building envelope.
Old timber-framed house
The façades may have architectural value that limits the possibilities for external insulation. The project can then assess the loft, floors and certain internal walls, using solutions compatible with the moisture behaviour of the timber and old infill materials. Ventilation must be considered alongside these changes.
Village house or former farmhouse
Large internal volumes and thick walls provide useful thermal inertia, but heating demand can remain significant where the roof, windows or some floors perform poorly. A coordinated approach makes it possible to tackle heat loss before assessing the output and operation of the future heating system.
Grants and funding
Depending on the type of work, the characteristics of the property and the applicant’s circumstances, an energy renovation may fall within schemes such as MaPrimeRénov’, CEE (energy savings certificates), reduced VAT or éco-PTZ (zero-interest eco-loan). The criteria are not the same for every scheme. Some grants also require the work concerned to be carried out by an RGE-certified professional. The applicable conditions should therefore be checked before any commitment is made.
To structure your project, you can contact GRAM Énergie to discuss the proposed work and the technical stages to plan. To check the rules of public schemes, eligibility criteria and procedures applicable to your situation, also consult the official France Rénov’ service before approving your renovation pathway.
How we work
Assessment of the property
We review the building configuration, walls, equipment already in place and the main constraints that may influence the work.
Identification of priorities
We assess the main sources of heat loss, ventilation and the interactions between the different elements.
Development of the scenario
Solutions are organised in a coherent order, taking account of the characteristics of the building and its equipment.
Preparation of the works
Technical points, dependencies between trades and any requirements linked to grants are clarified before work is commissioned.
Monitoring the pathway
The project is reviewed as a whole to maintain consistency between insulation, ventilation, heating and hot-water production.
Our other services in Haut-Rhin
The project may also require a heat pump in Haut-Rhin, insulation work, a thermodynamic water heater or an energy audit. You can also view our page dedicated to energy renovation in Haut-Rhin, our overview of energy renovation in Grand Est, as well as our local pages for Mulhouse and Colmar.
Frequently asked questions
Should you always start by replacing the heating system?
No. When insulation work is required, it is generally sensible to assess its effect on the property’s needs first. Equipment selected before improvements to the envelope may no longer suit the final situation. The scenario should therefore consider the building, ventilation and heating system together.
Can a timber-framed house undergo a global renovation?
Yes, but the techniques chosen must respect the behaviour of the old walls. Materials, water vapour management and ventilation require particular attention. Where the façade needs to be preserved, other areas such as the loft, floors or certain internal walls may take a more important role in the scenario.
Does a house with thick walls still need insulation?
Massive walls provide thermal inertia, but they do not automatically eliminate heat loss. Actual performance depends on their construction, the roof, windows, floors and the junctions between elements. A whole-building assessment makes it possible to identify the areas that justify intervention rather than applying the same solution everywhere.
How should several types of work be organised in Haut-Rhin?
The order depends on the building and the chosen scenario. The envelope and ventilation are generally assessed before the final sizing of the heating system. This approach helps avoid incompatibilities between works and keeps an overall view of the project, particularly when several contractors or categories of work need to follow one another.
Let’s talk about your project
Tell us about your home and your goals: we help you prioritise the works and identify the grants worth looking into.