- Paris-based Rayon closed a €10 million Series A led by Partech, with Northzone, Foundamental and Seedcamp returning, to fund 3D, AI features and go-to-market expansion.
- The browser-based platform has logged more than 4 million drawings and counts Virgin Atlantic, CityHub and Coloc Housing among users running layout and feasibility work in-house.
- Hospitality, coworking and housing operators increasingly test layouts before hiring architects, which could compress early-stage design spend across fit-out and repositioning projects.
Rayon, the Paris startup behind browser-based interior design software, has closed a €10 million Series A led by Partech, according to a company announcement dated September 29, 2026. Existing backers Northzone, Foundamental and Seedcamp also participated.
The raise will fund a 3D launch, deeper AI integration and a larger go-to-market push as the platform surpasses 4 million drawings created by users.
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Built for Interiors, Not Borrowed From Architecture
Bastien Dolla and Stanislas Chaillou founded Rayon in October 2021 around a simple premise: interior and experiential designers have long worked in CAD tools built for architects and engineers. Rayon instead targets the people designing restaurants, hotels, shops and workspaces.
Chaillou, the company’s COO and CPO, has spent close to a decade researching AI in architecture. Partech General Partner Réza Malekzadeh framed the bet as a narrow window, arguing Rayon built the design layer interiors actually needed rather than adapting architecture software.
Northzone Partner Michiel Kotting made a similar case, pointing to architecture and design as sectors that have historically trailed on tech adoption and have yet to catch up with advances in AI.
The Details
Rayon keeps plans, styling, specifications and schedules in one browser-based file, so a spec sheet updates automatically when the drawing changes. Teams edit the same drawing at once and share it by link instead of exporting files. Users can import PDFs, images and DWG plans and build custom block libraries.
Alongside the round, Rayon released a mobile-first app, a presentation mode for editing drawings live with clients and an expanded template library. Its AI tools already include a floor plan vectorizer that converts a scanned or photographed plan into an editable drawing with walls, openings and zones, plus a tool that generates blocks from photos.
CEO Dolla said demo prospects often expect a lightweight web app and instead find performance and features that beat most legacy CAD packages. Design studio Nolt Mathis, for one, dropped a 15-year legacy CAD subscription to switch.
The company has now raised close to €16 million in total and has tripled its headcount to 35 people.
Zooming Out on Interior Design Software Funding
The Series A follows a €4 million seed round in September 2023 co-led by Northzone and Foundamental, and a €1.7 million pre-seed in 2022 led by Seedcamp. Angel investors include Norman Foster of Foster + Partners, ArchDaily founder David Basulto and Loom co-founder Joe Thomas.
The step up lands in a proptech venture market that has grown more selective, with capital concentrating in companies showing real usage. Rayon’s pitch leans on that traction, as well as a claim that the interior design industry it serves is worth nearly €50 billion.
Why It Matters
Rayon’s customer list skews toward CRE operators rather than design firms alone. Virgin Atlantic designs airport lounges in the platform, and European hostel group CityHub reports saving €10,000 a month by running feasibility studies in-house.
Coloc Housing says its five-person business team saves €11,000 a month in feasibility costs by testing layouts before bringing in architects. Theo Bermejo, a project manager at Morning, said the tool won over both architects and non-architects across the company.
If more hospitality, coworking and housing owners pull early-stage layout work in-house, it could reshape how fit-out and repositioning budgets get spent, echoing broader research on how {L(‘https://www.credaily.com/briefs/ai-could-cut-construction-costs-by-up-to-20-study-finds/’,’AI could cut’)} building costs.
What’s Next
Rayon plans to ship V4 before the end of 2026, bundling a full suite of AI capabilities with 3D inside the same browser environment rather than as a separate product.
The test for operators will be whether AI-generated layouts stay precise enough to carry from feasibility through execution, the gap Rayon says it has spent five years building to close.
