AI voice agent development costs for London businesses depend on call volume, number of use cases, CRM integrations and UK GDPR compliance complexity. Small businesses and done-for-you SaaS services can deploy basic voice agents for £200 to £500 plus a monthly subscription. Custom builds from Softomate start at £4,000 and deliver full CRM integration, UK-compliant call recording and bespoke conversation logic that SaaS products cannot match.
| Business Size | Use Case | Typical Cost | Timeline |
|---|
| SME (1-20 staff) | Out-of-hours inbound calls, appointment booking, GoHighLevel or Google Calendar integration | £4,000 - £8,000 | 4-6 weeks |
| Growth Business (20-100 staff) | Multi-use-case: inbound qualification + outbound follow-up + CRM pipeline updates + call transcription | £8,000 - £15,000 | 6-10 weeks |
| Enterprise (100+ staff) | High-volume inbound routing, FCA or CQC compliance, Salesforce or Dynamics integration, custom voice persona, multi-department deployment | £15,000 - £25,000 | 8-12 weeks |
Ongoing running costs: Twilio telephony (approximately £0.01 per minute inbound, £0.013 per minute outbound for UK numbers) + ElevenLabs voice synthesis (approximately £0.30 per 1,000 characters) + LLM API tokens + hosting. A typical London SME handling 500 calls per month expects £120 to £250 in monthly running costs after go-live.