Passerelle, Interior Designer in Lyon and Energy Efficiency advisor
For beautiful, comfortable and efficient interiors
Marion Trouillet
Founder of the Passerelle agency
Reveal the value of your home
Your home can be more beautiful, more comfortable and more efficient.
The Passerelle agency does more than renovate a home. It reveals:
its aesthetic value,
its functional value,
its energy performance,
its heritage value,
its emotional value in the eyes of its occupants.
To achieve this, Passerelle bridges the beautiful and the useful, interior architecture and energy performance, the dream project and its realization, the current home and the home of tomorrow.
Interior design and energy efficiency
Interior Design
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Energy-efficient renovation
Let’s boost the ‘green value’ of your home
‘Green value’ refers to the added value in the property market when homes have good Energy Performance Certificates (A, B or C): it reflects winter comfort, summer comfort, energy savings, reduced environmental impact, the fact that the property is authorised for letting, etc.
According to the 2024 study by the French Order of Notaries on green value (see chart), the following trends are observed:
Up to +19% in price per sq m for a house with an A or B energy rating compared to its equivalent in class D (the benchmark class in the study),
Up to a 32% reduction in price per sq m for a house in energy class F or G compared to its class D equivalent.
A growing trend: ‘green value’ is increasing over the years as the market becomes increasingly sensitive to these criteria. Those who fare best in the property market are those willing to undertake renovation work to create ‘green value’ in their property.
Improve your comfort, energy efficiency and property value
Our achievements
+34
completed designs
Over €1.5 million’s worth of works
managed as part of site supervision
-50 metric tons of CO₂ equivalent/yr
thanks to the energy-efficiency renovations carried out
Customer reviews
“Marion worked with us on the interior renovation of our 1960s house. Attentive, responsive and full of sound advice, she helped us plan our home carefully for our retirement years and improve our comfort: we wanted to modernise it, insulate it and make the most of the space. Thanks to her suggestions and advice, we are very pleased with the result.”
— Pascale V.“Thank you to Marion for helping me. She helped me organise my flat by suggesting ideas that were both practical and visually appealing. I really liked the way she managed to bring her suggestions to life.”
— Guillaume P.“Marion helped us with the interior and energy-efficiency renovation of our stone townhouse. She gave us excellent advice on the layout of the rooms and on issues relating to the house’s natural light. As for the energy-efficiency work, she pointed us towards a number of very interesting options that we wouldn’t have considered on our own. […] She is responsive, offers sound advice and listens carefully to your needs and wishes. Thank you again, Marion!”
— Pauline K.“Marion gave me great support with my interior design. She showed me a range of different designs, which helped me choose the option that suited me best. She also helped me put together a shopping list and finalise my choices. All the ideas she came up with were brilliant!”
— Maxime L.A hybrid approach: architectural and thermal
Our aim is to create “beauty and goodness” (“kalos kagathos” in Ancient Greek): renovations that are both beautiful and energy-efficient.
At the heart of the firm’s DNA lies the combination of expertise in interior design and building thermal performance.
The Passerelle Agency: a commitment to beauty and quality
Active listening to clients’ needs and a commitment to attention to detail
At Passerelle, we are committed to tailoring every project to the client’s needs. Our aim is to create elegant interiors, functional layouts, well-designed circulation routes, enhanced lighting schemes, and designs that take into account the changing needs of the occupants.
We take great care in selecting materials and finishes.
End-to-end support
Comprehensive support: architectural design, energy performance certificate (DPE) simulation following renovation works, grant applications, selection of materials and interior styles, selection of contractors, and project management.
A single point of contact for our clients: simplicity and no loss of information.
Example: 153 sqm. house
Energy Performance Certificate (EPC) E → EPC B
+3 energy efficiency grades
+17% increase in property value
compared to an equivalent house with an EPC D (according to statistics from the French Notaries’ Association)
Project support in Lyon and the Lyon metropolitan area
Based in Lyon, Passerelle supports interior design and energy-efficiency renovation projects throughout the Lyon metropolitan area, notably in Lyon, Villeurbanne, Caluire-et-Cuire, Tassin-la-Demi-Lune, Écully, Sainte-Foy-lès-Lyon, Francheville, Saint-Genis-Laval, Oullins-Pierre-Bénite, Charbonnières-les-Bains, Craponne and the surrounding areas.
Are you based outside the Lyon metropolitan area? Let’s discuss it. The agency also occasionally supports projects outside Lyon (Paris, Bordeaux, Aix-en-Provence, etc.).
Discover our projects
Other benefits of Passerelle for your project
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With extensive experience of carrying out DIY renovation projects across all trades (electrical, plumbing, tiling, carpentry, etc.), I design practical technical solutions tailored to each project. This experience enables me to analyse quotes accurately and ensure rigorous site supervision.
My 12 years’ experience in project management, business transformation and risk management enable me to manage your building works effectively, ensuring that deadlines, budgets and the quality of workmanship are met.
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Recognised by insurers for the quality of my work, I operate under a ten-year guarantee. This essential safeguard protects you and ensures you receive reliable technical advice tailored to your project.
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I work with a network of skilled tradespeople, furniture suppliers and home improvement specialists, all selected for their professionalism. My clients benefit from negotiated rates and the expertise of eco-certified tradespeople, as well as partners relevant to their projects (solicitors, estate agents, tax advisers, etc.)
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For remote and/or large-scale projects, I work alongside professionals who share the same standards of quality and attention to detail. This approach enables me to oversee large-scale projects, including those outside the Lyon region, whilst continuing to provide personalised support.
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Fluent in English, I assist international clients with renovation and interior design projects throughout France. Regulations, building standards, trusted craftsmen and project coordination: I provide a single point of contact to simplify every step of your project.
The agency’s publications and news
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Marion Trouillet was a guest on “Décopreneurs”, Floor Van Zoelen’s leading podcast for architects and interior designers, to share her approach to interior design and energy-efficient renovation of energy-inefficient properties. It was an opportunity to discover some aspects of her approach:
Do you own a property with an energy performance certificate (EPC) rated E, F or G?
