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Digital One Agency builds custom AI solutions for UK businesses from London, Manchester, Edinburgh, Birmingham and beyond. We are a senior, founder-led engineering team headquartered on the Gold Coast (Australia) with active UK clients. We do not sell ChatGPT wrappers or off-the-shelf SaaS — every engagement is bespoke production code, owned by you, deployed on your infrastructure or ours.
Typical UK custom AI projects range from £12,000 to £120,000, with delivery in 6–20 weeks. We work in GBP, invoice UK-VAT compliant, and maintain time-zone overlap during UK working hours.
What We Build for UK Clients
- Custom AI agents — autonomous agents using Claude, GPT-5, Gemini 2 or open-source LLMs (Llama 3, Mistral, DeepSeek). Multi-step reasoning, tool use, RAG, structured output.
- Retrieval-Augmented Generation (RAG) pipelines — production RAG with Pinecone, Weaviate, Qdrant or pgvector. Chunking strategy, reranking, citation, evaluation harness included.
- Fine-tuned models — domain-specific fine-tunes on your data, deployed on AWS, Azure, GCP, or private infrastructure. Includes training pipeline and continuous re-training.
- AI-powered internal tools — AI dashboards, document intelligence, contract review, claims automation, lead qualification, knowledge bases.
- Vertical AI — production AI for finance, legal, healthcare, e-commerce, and professional services. UK GDPR + ICO compliant.
- AI integration into existing systems — Salesforce, HubSpot, Microsoft 365, Xero, Sage, Shopify, BigCommerce, NetSuite, custom ERPs.
Where We Deliver in the UK
Our UK clients sit across London, Manchester, Edinburgh, Birmingham, Bristol, Leeds and Glasgow. We have delivered for fintech startups, Series A SaaS companies, established professional services firms, and AIM-listed enterprises. Time-zone overlap is maintained Monday–Friday during UK working hours via dedicated UK-shift engineers.
Why UK Founders Choose Digital One Agency
- Senior, founder-led delivery — every project has a senior architect from day one. No junior pass-throughs, no offshore relay.
- Bespoke, not template — we don’t resell pre-built SaaS. The code is yours; you can take it in-house at any time.
- Fixed-scope quotes — milestone-billed, not hourly. You know what you’re paying before we write a line of code.
- End-to-end — strategy → architecture → build → deployment → optimisation → ongoing maintenance.
- UK-native delivery — GBP invoicing, VAT compliant, GDPR aware, ICO registered approach.
Our UK AI Engagement Process
- Free 30-minute discovery call — we scope the problem, identify the right architectural pattern, and tell you whether AI is even the right answer.
- Fixed-fee discovery (£2,000–£4,000, 1–2 weeks) — written technical spec, cost estimate to ±10%, and architectural diagram. Zero obligation to proceed.
- Build phase (6–18 weeks) — milestone billing, weekly demos, your team has access to staging from week 1.
- Deployment + handover — deployed to your cloud or ours. Source code, runbooks, and admin training included.
- Optimisation retainer (optional) — model upgrades, prompt iteration, eval harness improvements, new feature additions.
UK Custom AI Pricing (Typical Ranges)
- Discovery / scoping engagement: £2,000 – £4,000 (1–2 weeks)
- AI agent or chatbot (single use case): £12,000 – £35,000 (4–10 weeks)
- RAG pipeline + admin interface: £25,000 – £60,000 (8–14 weeks)
- Vertical AI platform (multi-feature): £45,000 – £120,000 (14–24 weeks)
- Fine-tuned model + training infrastructure: £30,000 – £90,000 (8–16 weeks)
- Ongoing optimisation retainer: £2,500 – £8,000/month
Every quote is fixed-scope after the discovery engagement. We do not bill hourly.
Tech Stack We Use for UK Clients
- LLMs: Claude (Anthropic), GPT-5 (OpenAI), Gemini 2 (Google), Llama 3, Mistral, DeepSeek, Qwen
- Vector databases: Pinecone, Weaviate, Qdrant, Milvus, pgvector
- Orchestration: LangChain, LangGraph, LlamaIndex, Anthropic SDK, OpenAI SDK, custom agent frameworks
- Backend: Python (FastAPI, Django), Node.js (NestJS, Express), Go, Rust where latency matters
- Frontend: Next.js, React, TypeScript
- Infra: AWS, Azure, GCP, Cloudflare Workers, Vercel
- Eval / observability: LangSmith, Helicone, custom evaluation harnesses
Get a Custom Quote — Free 30-Minute Discovery Call
If you are a UK business considering a custom AI build, talk to us before you commit anywhere. The 30-minute call is free, the scoping engagement gives you a written architectural spec you own, and the fixed-scope quote means no surprises.
- Senior engineer on the call from minute one — no sales handoff
- Written architectural recommendation, not a sales deck
- UK references on request
- Fixed-scope quote with milestone billing, no hourly rates