Renovating in Lausanne: A practical guide for homeowners

1 °C.8 °C, places strict demands on insulation to maintain thermal comfort. With 2,914 heating degree days per year, the building envelope is a major lever for reducing energy needs.

The Lausanne housing stock, composed of approximately 24% single-family homes, presents great architectural diversity. The city, committed since 1996 as an Energy City and holder of the Gold label, integrates strict criteria into its Climate Plan to reach carbon neutrality by 2050.

Every renovation project must therefore anticipate these local climate challenges, aiming for energy optimization consistent with the city's ambitions.

The absolute priority for any homeowner in Lausanne is to improve the building's thermal envelope. Facade insulation and the replacement of aging windows are the most effective interventions to limit heat loss. These works not only sustainably reduce the energy bill but also add long-term value to the property.

In addition to insulation, investing in renewable systems is strongly encouraged. The Vaud Building Program offers subsidies for facade insulation and window replacement if these measures are part of an overall renovation approach.

Rigorous planning, starting with the envelope before installing a high-performance heating system, is the best way to maximize overall energy efficiency and benefit from available financial aid.

The city of Lausanne is actively developing its district heating network, currently supplied by more than 66% renewable and waste-recovery energy. Long-term, this network aims to cover 75% of the city's heat needs with zero CO2 emissions.

The Territorial Energy Planning (PET) prioritizes network connection for eligible buildings, managed by the Services industriels de Lausanne (SiL).

For areas not served, installing heat pumps is the preferred solution. These systems are subject to the simplified permit procedure or permit exemption in the canton of Vaud. However, caution is required regarding noise pollution for air-water or air-air systems, which receive particular attention.

The city offers technical support via the GROUP-IT group and financial aid for Energy Project Management Assistance (AMOén) mandates to facilitate this transition toward renewable energy.

In Lausanne, handling construction permits depends on the type of work planned. For many common energy interventions, such as window replacement or solar panel installation, the canton of Vaud applies simplified procedures or even permit exemptions. This flexibility facilitates energy renovation.

However, increased vigilance is necessary if your building is protected or located in a protected area, as foreseen by the Architectural Census of the Canton of Vaud.

In such cases, work modifying the exterior appearance, dimensions, or usage of the building requires a standard building permit procedure from the municipality. It is strongly advised to consult municipal services before any commitment to check if your building is listed.

This respect for built heritage ensures the preservation of the Lausanne identity while allowing for necessary contemporary energy adaptations.

The renovation aid system in Lausanne is diverse and cumulative. The Building Program offers subsidies for replacing fossil heating with heat pumps, thermal insulation, and solar thermal energy.

Additionally, the Services industriels de Lausanne (SiL) offer specific aid, including a municipal flat rate of 4,000 CHF for solar thermal installations on existing buildings, which can be combined with cantonal aid.

Regarding taxation, the owner can deduct maintenance and energy investment costs from their taxable income. Investments aimed at energy saving are 100% deductible. If costs exceed net income, the balance can be carried forward to the two following tax periods.

You have the choice between deducting effective costs or a flat-rate deduction (often 20% or 30% depending on the building's age). Note that if you receive public subsidies, only the portion you personally finance is tax-deductible.

Successful renovation in Lausanne requires rigorous planning. The first step is to establish a precise status report of your building.

For large projects, hiring a professional for an energy audit or Project Management Assistance (AMO) is crucial, especially since the City of Lausanne subsidizes these mandates by 50% (up to 10,000 CHF).

When choosing contractors, prioritize local providers competent in Vaud-specific requirements, especially regarding energy renovation and heritage preservation. Ensure you obtain several detailed quotes for a fair comparison.

A good company should be able to advise you on technical solutions adapted to your structure, while integrating constraints linked to permits and current standards. Clear communication, checking references, and meeting deadlines are the pillars of a project without unpleasant surprises.