The rules of the game are changing for those who want to renovate their homes. Between the requirement for energy audits before certain sales, increasing restrictions on fossil fuel heating systems, and the technical criteria imposed to access financial aid, residential renovation is no longer just about choosing a paint color or new tiles. Planning a construction project in an occupied dwelling now requires navigating a regulatory framework that redefines priorities, budgets, and the order of interventions.
Energy constraints and renovation: what changes in project planning
Until recently, a homeowner could renovate room by room according to their desires. Insulating the attic came after the kitchen, and the boiler waited until it broke down. This reasoning now clashes with obligations that impose a holistic view of the housing.
Several municipalities now regulate the materials and equipment allowed during a renovation. In Montreal, for example, a newly redone flat roof must use a white membrane to limit heat islands if the owner wishes to benefit from the RénoPlex subsidy. This type of technical requirement necessitates checking eligibility conditions even before requesting a quote.
To accurately identify the work to be done with Oh Brico, one must start from the building’s energy diagnosis rather than a list of aesthetic wishes. The audit reveals thermal losses, prioritizes tasks, and conditions access to most public aid.
Local regulations are also beginning to significantly restrict the use of fossil fuels. Still in Montreal, a regulation prohibits heating and hot water devices powered by natural gas, oil, or propane in new residential constructions, with a phased implementation starting in October 2024 for small buildings and April 2025 for large ones. For a major renovation, this framework influences the choice of replacement heating system and the electrical sizing of the dwelling.
Insulation and heating: the order of work changes the budget
Renovating insulation before replacing heating is not just common sense. It has become a condition for subsidies to cover a significant portion of the total cost. A poorly insulated home equipped with a high-performance heat pump will consume more than expected, and the gap between the energy promise and reality can disqualify the project during a post-work inspection.
The order of intervention modifies the sizing of each component. Effective insulation of walls and roofs reduces the power needed for the new heating system. In practical terms, this means less expensive equipment to purchase and use.
Field feedback varies on this point: some craftsmen recommend doing everything in a single phase of work to limit disturbances in an occupied dwelling, while others advocate for a phasing over two seasons to smooth out expenses. Both approaches have their limits.
- In a single phase, the project lasts several weeks and often requires freeing up part of the dwelling, complicating the daily lives of the occupants
- In two phases (insulation then heating the following season), the owner endures a winter with the old system in a partially renovated building, which can generate humidity problems if ventilation has not been adjusted
- A third option is to start with ventilation and air tightness, often neglected, which nonetheless conditions the performance of the insulation installed later
Financing energy renovation work without false hopes
The landscape of financial aid for renovation gives the impression of an abundance of programs. In reality, the technical conditions to benefit from them eliminate a significant portion of projects. The criteria focus on the performance of materials (minimum thermal resistance for insulation), on the qualification of professionals (required certifications), and on the nature of the dwelling (year of construction, type of occupancy).
A quote that does not mention the required technical characteristics will be rejected at the time of the subsidy application, even if the work is practically identical. The difference between a funded project and a rejected one sometimes comes down to a missing line on the document.
Check the criteria before signing a quote
Before comparing prices among craftsmen, one must first verify that each quote complies with the specifications of the targeted aid. This requires knowing the precise requirements of the program, which vary by region and type of work.
Requesting multiple quotes remains relevant, but the sorting criterion is no longer just price. The technical compliance of the quote, the certification of the company, and its ability to meet deadlines condition the actual amount of the subsidy obtained.
Materials and quality: balancing energy performance and daily comfort
The requirements of subsidies steer the choice of materials towards products with high thermal performance. This constraint is not always compatible with other criteria that the owner considers priorities: acoustic comfort, moisture resistance, ease of installation in a furnished dwelling.
A bio-sourced insulation (wood fiber, cellulose wadding) offers a good compromise between thermal performance and hygrometric regulation, but its required thickness can reduce the living space in already narrow rooms. In contrast, a thinner synthetic insulation achieves the required thermal resistance with less bulk, at the cost of a less favorable environmental balance.
- Wood fiber naturally regulates humidity and improves summer comfort but requires a more generous thickness to meet subsidy thresholds
- Sprayed polyurethane offers effective insulation at low thickness, suitable for space constraints, with quick installation that limits the duration of the project
- Blown cellulose wadding is well-suited for lost attics and often represents the best performance/price ratio for this type of configuration
The choice of material depends as much on the geometry of the dwelling as on the desired performance. A precise diagnosis of the existing situation avoids applying a standard solution to a situation that does not lend itself to it.
Renovating an occupied house while considering the new energy constraints requires more preparatory work than a few years ago. The audit, the verification of subsidy criteria, the sequencing of interventions, and the choice of materials form a set where each decision influences the next. Starting with the diagnosis rather than the trend catalog remains the best way to avoid a project that costs more than expected for a result below expectations.