The agency
Architects and builders,
by conviction
Xiléades was born from the conviction that architecture and construction should never be separated. By combining these two professions, we offer total project control.
Our name carries this vision: Xiléades is born from the meeting of Xylo (ξύλο), Greek for wood — a living, noble, and sustainable material — and Aèdes (ἀοιδός), the artist or poet in ancient Greece, which in Latin became the dwelling or temple. Xiléades is the art of building places with a soul.
The Architecteur concept
As a member of the national network Les Architecteurs®, Xiléades offers an innovative Design + Build model that brings the architect and the builder together within a single structure.
This integrated approach guarantees total consistency between the architectural vision and its technical execution. A single contract, a single point of contact, a single responsibility.
Another major advantage: a single point of contact for design and works. On insurance, we have taken out professional liability (RC pro), ten-year liability (décennale) and contractors' all-risks (TRC) cover.
The result: projects delivered on time, within budget, and always in line with the initial promise.
Our green commitment
Eco-responsibility is not a marketing argument at Xiléades — it is a foundation. Each project is an opportunity to rethink our impact on the environment.
Bio-sourced materials, high-performance insulation, water recovery, renewable energy: we systematically integrate the best practices of sustainable construction.
Our commitment goes beyond the building: we also take action for biodiversity. Each project includes the installation of bird nesting boxes, helping to preserve urban wildlife and create living spaces in harmony with the living world.
Our goal: to design buildings that will age well, consume little, and offer optimal comfort — to both their occupants and the surrounding nature.
Founders
The founding team
Alexis Mercado
Architecte Associé
- •2010 – Diplôme d'état d'Architecte – Universidad Central de Venezuela
- •2020 – Mastère Spécialisé BIM – École nationale des ponts et chaussées & ESTP
- •2022 – DU Business Management – Université Paris-Dauphine PSL
Hélène Mercado
Architecte Associée
- •2014 – Diplôme d'état d'Architecte – ENSA Nancy
- •2017 – HMONP – École nationale supérieure d'Architecture de Nancy
Our values
Eco-responsibility
Each project integrates a reflection on environmental impact: bio-sourced materials, energy performance, and sustainability.
Bespoke
No generic solutions. Each space is designed to meet the specific needs of its occupants.
Transparency
Contractual budget, shared schedule, regular communication. You always know where your project stands.
Excellence
Our standard of quality applies to every detail, from the first plan to the final delivery.
Our reach
Service areas
Four ways of working, depending on distance. Outside our home region we design the project and hand site supervision to an Architecteur based near you.
Île-de-France — direct delivery
Our own region. Team on site, weekly site supervision, for private clients and businesses alike.
Île-de-France
Northern half — planned visits
We run the project end to end, with visits timed on construction milestones.
Hauts-de-France · Normandie · Grand Est · Bretagne · Pays de la Loire · Centre-Val de Loire · Bourgogne-Franche-Comté
South — we design, a local partner builds
We design the project and site supervision goes to a member firm of the Les Architecteurs cooperative based near you.
Auvergne-Rhône-Alpes · Nouvelle-Aquitaine · Occitanie · Provence-Alpes-Côte d'Azur
Corsica — case by case
Neither an office nor a network partner on the island. We look at the project and tell you plainly.
Corse
Our own practice, plus 59 Architecteurs® network practices across mainland France. Surveyed 2026-09-20.
Réseaux sociaux
Suivez l'agence
Retrouvez nos chantiers, notre quotidien et nos actualités sur nos réseaux.
Présence dans la profession
Exposants des salons de référence
Nous participons chaque année aux rencontres clés de nos secteurs pour échanger directement avec les professionnels et faire évoluer nos solutions architecturales.
Project decoder
Start my project
4 minutes. 6 questions. A personal reply from Hélène or Alexis by Thursday 15 October at the latest.
Why 4 minutes instead of a contact form?
Because the person who calls you back is not a salesperson — it is the architect who will draw your project. We want to understand before we propose a meeting, not the reverse.
We answer personally by Thursday 15 October at the latest. Phone, short video call, or voice note — your choice.