Build a Multi-Domain AI Knowledge Base for Service Firms
n8n's multi-domain RAG tutorial enables immigration and legal firms to route client questions to specialized AI knowledge bases automatically, cutting response time from 30 minutes to under 10 seconds.
Build a Multi-Domain AI Knowledge Base for Your Service Firm
Immigration and legal firms in Australia can automate up to 80% of routine client Q&A using n8n's multi-domain RAG (Retrieval-Augmented Generation) system — routing each question to the right specialised knowledge base in under 10 seconds, with zero manual sorting.
What Is Multi-Domain RAG?
RAG stands for Retrieval-Augmented Generation. Instead of relying on a generic AI, you feed it your own documents — visa guidelines, loan product sheets, court precedents, tax regulations — and the AI answers based on your specific content.
Multi-domain means one system handles multiple knowledge areas simultaneously. When a client asks "What documents do I need for a partner visa?", the AI routes to your immigration database. When another asks "What is the current serviceability buffer rate?", it routes to your lending database.
Why This Matters for Australian Service Businesses
Australian Chinese service businesses typically manage:
- Immigration firms: 200+ visa subclass requirements, updated monthly by the Department of Home Affairs
- Mortgage brokers: 30+ lender products, weekly rate changes, serviceability calculators
- Law firms: Case precedents, compliance checklists, onboarding forms
- Accounting firms: ATO rulings, BAS guides, tax thresholds
Before RAG: a staff member spends 20-40 minutes per inquiry searching folders, PDFs, and emails.
After RAG: the AI answers in under 10 seconds, citing the source document.
How to Set It Up with n8n
n8n's March 2026 tutorial walks through four steps:
- Connect Pinecone (vector database) to store your firm's documents
- Create specialist nodes — one per domain (immigration, loans, legal)
- Add an AI router that reads the question and picks the right knowledge base
- Deploy as a chatbot on WhatsApp, WeChat, or your website
The Pinecone Assistant node handles semantic search — even poorly phrased questions get matched to the right answer.
Real Scenario: Immigration Firm in Sydney
A Sydney migration agent with 3 staff handles 50+ client inquiries weekly. After implementing multi-domain RAG on n8n:
- Initial document upload: 4 hours (one-time setup)
- Weekly time saved: 15 hours across the team
- Client satisfaction: responses arrive in minutes, not hours
Cost Estimate
| Component | Cost | |-----------|------| | n8n Cloud | from $20/month | | Pinecone free tier | up to 1M vectors free | | Total for small firm | under $50/month |
FAQ
Q: Do I need coding skills to set this up? n8n uses a visual drag-and-drop interface. Basic setup requires no coding; advanced customisation may need light scripting.
Q: Can the AI handle Chinese and English documents? Yes. Both n8n and Pinecone support multilingual content. You can upload documents in Chinese, English, or both.
Q: How often should I update the knowledge base? Whenever policies change. For immigration, this may be monthly; for lending rates, weekly. Updating takes minutes with bulk upload.
Q: Is client data safe? n8n can be self-hosted, meaning your client data never leaves your server. Cloud setups encrypt data in transit and at rest.
Q: Can this integrate with WeChat or WhatsApp? Yes. n8n has native WhatsApp Business integration and connects to WeChat via API.