AI Sales Agent for Windows and Doors
A European supplier in windows, doors, and shading wanted to qualify dealer inquiries in four markets without doubling the sales team. We built a multilingual sales agent that qualifies dealers via website, email, and form, prepares quotes, and mirrors everything in HubSpot. In production today across Germany, France, Spain, and Italy.
Starting situation
The client operates B2B — selling to specialist dealers, not end customers. Inquiries came from several countries, in several languages, with varying levels of qualification. Internal sales reps spoke German, with gaps in Spanish and Italian. Inquiries from those markets often sat for days before they could be handled meaningfully. At the same time, margins in the windows and doors business are tight enough that doubling the sales team was not a real option. The client wanted a way to automate initial qualification without losing the value of personal contact later in the process.
Solution
We built a B2B sales agent that operates under a fixed name and responds in German, French, Spanish, and Italian. The agent recognizes legitimate dealer inquiries, asks structured questions about product range, geographic reach, current suppliers, and demand volume. It answers technical questions about profiles, glazing, lead times, and showroom material — all from a curated knowledge base coordinated with the head of sales. Qualified contacts are synced directly into HubSpot with full conversation history, scoring, and assignment to the right field rep in each market. Spam, unsuitable inquiries, or end-customer inquiries are filtered out or politely redirected. The solution runs on the platform of our sister company N44, which specializes in windows, doors, and shading.
Result
The agent is in production across four markets — Germany, France, Spain, Italy. Inquiries are answered around the clock in the local language, qualified leads land in the client's HubSpot, and the sales team only works with qualified contacts. Concrete numbers — inquiry volume, conversion rates, revenue impact — are under NDA and shared on request in confidential conversations.
What we learned
Four points shaped this project. First: B2B sales is built on trust. An agent that is too obviously a bot scares dealers off — we put significant time into tone of voice per language, idiomatic questioning, and the right level of technical precision. Second: technical depth in the knowledge base is critical. Dealers ask technical questions that end customers never would — U-value calculations in specific assemblies, profile compatibility across brands, warranty terms in detail. Shallow answers lose the inquiry. Third: HubSpot hygiene. Without clean pipeline stages and clear lead scoring, even the best AI advantage disappears. We reworked the HubSpot structure with the client before the agent went live. Fourth: scaling to additional languages is much cheaper than the first market. The first market — Germany — consumed the largest build effort. Each additional market was a fraction of that. Anyone planning multilingual B2B sales should build the first market cleanly and derive the others.
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