The cost of POS software development in the UK generally ranges from £15,000 to £30,000 for basic systems and can go £50,000+ for advanced multi-store or enterprise solutions. Pricing depends on features like inventory management, analytics, CRM, multi-device support, payment gateway integration, and custom UI. Cloud-based and mobile POS apps may cost less initially but require ongoing maintenance. Choosing the right development partner ensures scalability, performance, and long-term value.