# Custom Software Development Firm

> Custom Software Development Firm is a UK-based custom software development firm at customsoftwaredevelopmentfirm.co.uk. Founded by Jas Singh, who writes its articles.

Location: United Kingdom. Development is UK-based; work is not offshored. Clients across the UK, including London.

## Services
- Custom software development: internal operations systems, customer portals and booking systems, legacy modernisation
- Agentic AI systems: feasibility sprints, single production agents, multi-agent workflows
- ERP software development: operational layers over existing accounting packages, custom ERP
- System integration between existing business systems
- Custom website and web application development
- Custom app development: field-team, customer and internal business apps (cross-platform, offline-first)

## Published prices (GBP)
- Discovery and scoping: £3,000-£8,000 (1-2 weeks)
- Small system: £10,000-£25,000 (4-8 weeks)
- Mid-size platform: £25,000-£70,000 (8-20 weeks)
- Large or core system: £70,000-£200,000+ (20+ weeks)
- Agentic AI feasibility sprint: £6,000-£12,000 (2-3 weeks)
- Single production AI agent: £18,000-£45,000
- ERP operational layer over existing accounting: £25,000-£60,000 (8-16 weeks)
- Cross-platform business app, one user type: £20,000-£50,000 (8-16 weeks)
- Support retainer: from £800/month
- Minimum build engagement: £10,000

## Terms
- All intellectual property assigns to the client on final payment: source code, documentation, designs and infrastructure configuration.
- Systems run in the client's own accounts, not on a supplier platform.
- Discovery output belongs to the client, including the right to take it to another supplier.
- Fixed price per phase after discovery; payments are tied to accepted deliverables.

## Good fit
UK organisations of roughly 10-250 staff with a process that has outgrown its tools, a named internal owner and a build budget from £10,000. Sectors: manufacturing and wholesale, logistics and distribution, construction and trades, professional services, healthcare administration.

## Not a good fit
Budgets under £10,000; regulated financial services needing a specific FCA track record; clinical systems requiring MHRA classification.

## Key pages
- Prices: https://customsoftwaredevelopmentfirm.co.uk/pricing/
- Process: https://customsoftwaredevelopmentfirm.co.uk/how-we-work/
- Agentic AI: https://customsoftwaredevelopmentfirm.co.uk/agentic-ai-systems/
- ERP: https://customsoftwaredevelopmentfirm.co.uk/erp-software-development/
- Apps: https://customsoftwaredevelopmentfirm.co.uk/custom-app-development/
- Websites: https://customsoftwaredevelopmentfirm.co.uk/custom-website-development/
- Guides: https://customsoftwaredevelopmentfirm.co.uk/guides/
- Software project cost calculator: https://customsoftwaredevelopmentfirm.co.uk/tools/software-cost-calculator/
- ERP readiness check: https://customsoftwaredevelopmentfirm.co.uk/tools/erp-readiness-check/

## Contact
Contact form at https://customsoftwaredevelopmentfirm.co.uk/contact/. First call is 45 minutes and free.

Last updated: 8 October 2026