Expert thermal engineering office (BET) in Lille. We provide RE2020 studies, energy audits, and Bbio certificates for new builds and renovation projects.BET Thermique Lille Engineering for Building Energy PerformanceFor new construction projects within the northern French metropolis, achieving RE2020 compliance mandates a detailed energy performance analysis from the earliest design stages. A technical design office will model the building's entire life cycle carbon footprint, ensuring the project meets stringent bioclimatic and energy consumption targets before a single brick is laid. https://kto-bet.casino prevents costly redesigns and secures building permits without delay.For existing structures, an energy audit identifies specific points of heat loss and inefficiency. A building performance consultancy uses tools like infrared thermography to visualize thermal bridges and air leaks. Their final report quantifies potential savings and outlines a prioritized list of improvements, from upgrading boiler systems to installing double or triple-glazed windows, providing a clear roadmap for renovation.The building stock in the capital of French Flanders, characterized by its older masonry and row houses, presents unique challenges for heat management. An engineering firm with local expertise assesses how to best improve insulation without compromising the structural integrity or aesthetic of these properties. They provide specifications for ventilation systems that manage humidity, a frequent concern in the region's climate, thereby improving both energy balance and indoor air quality.BET Thermique Lille: Your Project's Technical PartnerFor new constructions in the Hauts-de-France region aiming for RE2020 compliance, specify a geothermal heat pump coupled with underfloor heating. This configuration directly addresses the regulation's carbon impact indicator (Icconstruction) and can lower annual energy consumption by 30-40% compared to a conventional gas boiler system. Your technical design office provides the necessary soil feasibility studies and system sizing calculations to validate this choice during the preliminary design phase.In renovation projects, a detailed energy audit is the first step. This includes a thermographic scan to identify thermal bridges and blower-door testing to quantify air leakage (n50 value). A common recommendation for older brick buildings in the area is the installation of a dual-flow controlled mechanical ventilation (CMV) system with heat recovery. Such a system recovers over 90% of heat from extracted air, improving indoor air quality while minimizing heat loss.An engineering consultancy specializing in building energy performance integrates with your architect from the schematic design stage. The firm produces detailed fluid network plans (heating, ventilation, plumbing) and technical specifications for all equipment. Precise pipe and duct sizing, based on calculated flow rates and pressure drops, prevents equipment oversizing, reducing both initial capital expenditure and long-term operational costs.For complex commercial or multi-family residential projects, request a Dynamic Thermal Simulation (DTS). This modeling predicts the building's temperature fluctuations over a full year, identifying summer overheating risks and testing the performance of solar shading strategies. The analysis also informs the Life Cycle Assessment (LCA), providing quantitative data on the carbon footprint of different material and system choices, which is a requirement for achieving higher environmental certification levels.Navigating RE2020 Requirements for New Construction in LilleSecure a building physics expert during the preliminary design phase, before architectural plans are finalized. This allows for the integration of bioclimatic principles from the project's inception, directly impacting the Bbio (bioclimatic need) coefficient. For projects in the capital of Hauts-de-France, this means maximizing southern-facing glazing with high-performance triple-pane windows (Ug ≤ 0.7 W/m².K) while minimizing openings on the northern façade.Achieve compliance by focusing on the airtightness of the building envelope. A mandatory blower door test must yield a result below Q4Pa-surf ≤ 0.6 m³/(h.m²). This performance level is obtained through meticulous installation of vapor barriers, sealing around windows, and managing all service penetrations. Poor airtightness directly increases heating needs and penalizes the Bbio score.The Cep (primary energy consumption) and Ic-énergie (operational carbon) indicators mandate a definitive shift away from fossil-fuel heating systems. For new homes in this northern French metropolis, an air-to-water heat pump combined with underfloor heating is a standard compliant solution. The integration of rooftop photovoltaic panels is also a direct method to lower the Cep value by generating renewable energy on-site.The Ic-construction (embodied carbon) indicator requires a life-cycle analysis (LCA) of all building materials. To meet the progressively lower carbon thresholds, specify materials such as wood-frame structures, bio-sourced insulation like cellulose wadding or hempcrete, and low-carbon concrete mixes. Sourcing these materials from suppliers within the region further reduces their transport-related carbon footprint.Address the summer comfort requirement (DH - degree-hours) without resorting to active cooling systems. For the climate in this part of France, this is achievable with passive strategies. Implement external solar shading like adjustable louvers (brise-soleil), utilize materials with high thermal inertia such as concrete slabs, and design for effective cross-ventilation to manage heat gains during summer peaks.A final compliance certificate is issued only after a post-construction verification. An independent professional confirms that the installed insulation, windows, ventilation, and heating systems match the specifications detailed in the thermal study. This verification includes the definitive airtightness measurement, making on-site quality control a non-negotiable part of the construction process.The Process of an 'Audit Énergétique' for Home RenovationsGather your home's architectural plans, property deeds, and the last three years of energy consumption bills for all sources (gas, electricity, oil) before scheduling an appointment. An energy assessment firm requires this documentation to establish a precise baseline of your property's performance. Include any records of previous renovations, particularly window replacements or insulation additions, as this preliminary data exchange permits a more focused on-site visit.The on-site evaluation takes between two and four hours. During this time, a technician systematically inspects the building envelope, measuring all wall, floor, and attic surface areas. A blower door test (infiltrométrie) is performed to quantify air leakage rates for the entire structure. This test depressurizes the house, allowing the specialist to pinpoint specific drafts through window seals, electrical outlets, and structural joints. A thermal imaging camera is used to visualize heat loss across surfaces, identifying 'cold bridges' where insulation is absent or failing.The inspection continues with an examination of the building's systems. The technician records the make, model, age, and condition of the primary heating system, the domestic hot water production unit, and any mechanical ventilation. The type and condition of all windows and doors are cataloged, noting the frame material and glazing type (single, double, triple). This detailed inventory is fundamental for the subsequent modeling phase.Following the visit, all collected data is entered into calculation software that adheres to the 3CL-DPE methodology. This software constructs a digital model of your home to calculate its current energy consumption (in kWh/m²/year) and its greenhouse gas emissions. The model assigns the property its official energy label (from A to G) and serves as the reference point against which all proposed improvements are measured.The final report presents a minimum of two distinct renovation scenarios. The first scenario details a multi-stage plan, breaking down the work into logical steps that can be executed over several years to align with budget constraints. The second scenario outlines a single-phase project designed to achieve a high-performance standard, often targeting a 'Bâtiment Basse Consommation' (BBC) level or a minimum energy class of B. Each scenario includes a list of specific works (e.g., "Install 300mm of blown-in cellulose insulation in the attic," "Replace gas boiler with an air-to-water heat pump with a COP of 4.0"), their estimated costs, projected energy savings in kWh and Euros, and details on accessing financial aid such as MaPrimeRénov'.Leveraging a Thermal Study to Access MaPrimeRénov' GrantsAn official energy performance analysis is a non-negotiable prerequisite for obtaining funds through the MaPrimeRénov' "Parcours accompagné" program. This audit must be conducted by a state-accredited "Mon Accompagnateur Rénov'" (MAR') to be valid for your grant application. The resulting report forms the technical foundation of your funding request.The MAR'-certified building energetics report must contain specific elements for acceptance:An initial Diagnostic de Performance Énergétique (DPE) establishing the home's baseline energy consumption.A minimum of two distinct renovation scenarios. One scenario must detail a path to achieve a high-performance level, often targeting DPE class B.A detailed breakdown of proposed works, including estimated costs for materials and labor.Calculations showing projected energy savings in kWh/m²/year and euros for each scenario.A projection of the final DPE classification after the completion of the works.To successfully use this document for your grant application, follow these steps:Select a government-approved "Mon Accompagnateur Rénov'". Verify their accreditation on the official France Rénov' directory. The chosen professional must be independent and not tied to any specific construction company or materials supplier.Ensure the proposed work packages in the audit prioritize the most impactful measures for your property type, such as attic insulation with an R-value of 7 m².K/W or wall insulation with an R-value of 3.7 m².K/W, which are common requirements for eligibility.Confirm the audit explicitly states the number of DPE classes your home will improve. A jump of at least two classes is necessary to access the "Rénovation d’ampleur" funding level. For example, an upgrade from a DPE class F to a class C.Submit the complete energy performance analysis as part of your application on the official MaPrimeRénov' online portal. The file is digitally attached to your request.The cost for this mandatory building energy analysis is itself eligible for partial funding under the scheme. Depending on household income, MaPrimeRénov' can cover a portion of the "Mon Accompagnateur Rénov'" fee, which includes the audit, up to a maximum of €2,000.