Current mission → Fonds Prévention Argile
FREN
Designing a tool that automatically analyzes energy renovation quotes and helps fix them, for three very different audiences: contractors, homeowners and renovation advisors.
At a glance
Making an automated quote analysis readable and actionable for contractors, homeowners and advisors with radically different needs.
The complete user journey and the results and correction interfaces. The service analyzed more than 11,000 quotes, peaking at 1,000 quotes in a single week.
The reasons for the shutdown were outside the product, but I could have pushed for earlier testing with case officers to measure the real impact on processing times.
How a state startup works from the inside: iterating fast, measuring impact and knowing when to stop. And designing with the French State Design System, where accessibility isn't optional but a constant requirement.
Housing accounts for 11% of greenhouse gas emissions in France. The government is aiming for 700,000 energy renovations a year, backed by financial aid such as MaPrimeRénov', energy savings certificates (CEE), the zero-interest eco-loan (éco-PTZ) and the reduced 5.5% VAT rate.
The problem: most quotes and invoices contain errors or missing information. The result: long, frustrating back-and-forth between homeowners, contractors and France Rénov' advisors, longer processing times, and households that end up giving up. On top of that, there was no standard reference for the information required for each type of renovation work.
Mon Devis Sans Oublis is a beta.gouv state startup, a winner of the FAST program, run by La Fabrique Numérique de l'Écologie.
The tool automatically pre-checks quotes using AI (Mistral, Albert), in three building blocks: reading the PDF to extract structured data, an algorithm that checks this data against regulations, and an interface that helps fix the quote.
That last building block, and the entire journey around it, is what I designed.
Contractors in the field, short on time. Homeowners with no expertise, often anxious about paperwork. Mon Accompagnateur Rénov' (MAR) renovation advisors, experts who need tracking and annotation tools. Three profiles with radically different needs, on the same journey.
So the journey stays as simple as possible: choose your profile and your type of renovation (single work item or comprehensive renovation), upload your quotes, and get the analysis results.
Results show a compliance rate, overall and per quote. Corrections are sorted into three categories: overall inconsistencies, missing or incorrect administrative information, and technical work descriptions.
For a comprehensive renovation involving several quotes, the tool also checks that they're consistent with one another: client name, address, etc.
MAR advisors, and only them, can comment on each quote and each correction line. Corrections can then be exported as text or shared via a link.
An automated analysis is never 100% reliable. On the interface side, the challenge was to present the results in a useful, understandable way, explaining what was detected without passing it off as absolute truth.
All of this in strict compliance with the DSFR, which I sometimes had to extend for use cases it didn't natively cover, while keeping technical information and ever-changing regulations accessible and clear.
Despite excellent user feedback, the product was suspended in May 2026, for structural reasons outside the product itself:
In a state startup, knowing when to stop is part of the method. The team published a full post-mortem, and the code is open source:
My work involved:
A project that showed me from the inside how a state startup works, with the French State Design System and accessibility at the heart of every decision. And a shutdown that serves as a reminder that a good product, loved by its users, isn't always enough: it also depends on everything around it.