Your London agency runs employees on BambooHR and the freelance bench on a spreadsheet nobody trusts
Custom HR (Human Resources) software in London typically costs £45k to £140k over 4 to 7 months. You build custom when off-the-shelf HR tools model permanent employees well and your actual workforce, the freelance bench, the IR35 calls, the right-to-work and visa tracking, doesn't fit their boxes. For a London agency or services firm, the trigger is the day a mis-tracked IR35 status or an expired visa becomes a real liability.
BambooHR, Workday, and Gusto are built around a clean permanent-employee model: one person, one contract, one set of dates. Your London agency doesn't work like that. You run a core team plus a rotating freelance bench, contractors whose IR35 status you have to assess and document, and a workforce that includes visa holders whose right-to-work and expiry dates you are legally obliged to track. The off-the-shelf tool has no real home for any of it, so it lives in spreadsheets.
That gap is a liability, not just an inconvenience. A freelancer mis-categorised under IR35, an expired right-to-work check, a visa renewal missed, each carries real financial and legal exposure in the UK. Your HR lead manages the highest-risk parts of the workforce in the tool the official HR system can't see, which is exactly the data you most need to be reliable and auditable.
What breaks first in London
- BambooHR and Workday model permanent staff but have no real structure for a freelance bench
- IR35 status assessment and documentation lives in spreadsheets, creating tax exposure
- Right-to-work and visa-expiry tracking is manual and easy to miss, a legal liability
- Contractor onboarding, rates, and availability sit outside the official HR system
The fix: HR built for London, not rented
A London agency's workforce is a mix of permanent, freelance, and contract people with UK-specific compliance, IR35, right-to-work, visa tracking, that no off-the-shelf HR tool was designed to hold. Custom HR software models your actual workforce: the bench with its rates and availability, documented IR35 assessments, and automated right-to-work and visa-expiry alerts. The riskiest, most compliance-sensitive parts of your workforce move out of spreadsheets into an auditable system, which is exactly where they need to be.
What HR costs in London
| Project scope | Typical cost | Timeline |
|---|---|---|
| Custom HR module for freelance bench + IR35 | £45k to £85k | 4 to 5 months |
| Full custom HR platform with compliance tracking | £90k to £140k | 5 to 7 months |
| Right-to-work and visa-tracking module only | £30k to £55k | 3 to 4 months |
The capability list that earns its budget
HR services we deliver in London
The engagements London teams bring us most often: Workday integration, leave management, performance management software, custom HR software and HRIS development.
Exactly what you get
HR software that models the workforce you actually have, not the permanent-only one BambooHR assumes. Your freelance bench with rates, skills, and availability lives in the system. IR35 assessments are documented with an audit trail HMRC would accept. Right-to-work and visa expiries trigger alerts before they become liabilities. And contractor onboarding follows a recorded process. The riskiest, most compliance-sensitive parts of your London workforce move out of spreadsheets and into an auditable system.
How to choose a developer in London
Hire a team that understands UK employment compliance, not just HR data models, because IR35, right-to-work, and visa tracking are where the real liability sits. Ask how they'd document an IR35 assessment so it survives an HMRC query, and how visa-expiry alerts actually fire. A partner who treats freelancers as ordinary employee records has missed the point. Connect the HR build to your project management software and internal tools so resourcing draws on the same bench data the compliance team relies on.
- !They've never handled IR35 or right-to-work logic; ask for a UK agency reference
- !They treat freelancers as just another employee record; ask how they model the bench
- !No audit trail for status decisions; ask how an HMRC IR35 query would be answered
- !Visa-expiry tracking is hand-waved; ask how alerts are triggered and to whom
- !Quote without understanding your workforce mix; ask for a workforce audit first
Teams investing in HR in London usually scope it next to pos, warehouse management, helpdesk & ticketing, since these systems share data and budgets. Weighing options across the region? We publish the same HR guide for Birmingham, Manchester, Liverpool. Want it built, not just budgeted? That is our custom software development practice.
The evidence behind this guide
Independent findings on why this investment pays off. Every link goes to the primary source.
- Bersin by Deloitte research found organizations that use HR technology and employee-centric design to build a flexible, empowering workplace are more than 5 times more effective at improving employee engagement and retention than their peers, and 2.5 times more likely to reach 'high-impact' status by leveraging HR for digital transformation. Source: Bersin by Deloitte (2017) →
- SHRM's 2025 benchmarking data puts the average cost-per-hire at $5,475 for nonexecutive roles and $35,879 for executive roles - executive hires are on average nearly 7x more expensive than nonexecutive hires. Source: SHRM (Society for Human Resource Management) (2025) →
- Gartner estimates RPA can eliminate up to 25,000 hours of avoidable rework caused by human errors in the finance function each year, equating to savings of roughly $878,000 for an organization with 40 full-time accounting staff (based on interviews with more than 150 corporate controllers and chief accounting officers). Source: Gartner (2019) →
- Only about 30% of digital transformations succeed at meeting their objectives, but getting six critical success factors in place (leadership commitment, talent, agile culture, progress monitoring, clear strategy, and a modernized platform) raises the odds of success from 30% to 80%. Source: Boston Consulting Group (BCG) (2020) →
Tahlia designs mobile apps at Digital Heroes, working close to the iOS and Android engineers who build them. Day to day that is screens, states, motion and the specs that tie them together. Her posts are for anyone weighing up what a good app actually takes to design.
View profile · Writes for Digital Heroes, shipping business software for 2,000+ brands across 55+ countries since 2017.
Frequently asked questions
Why can't BambooHR handle our freelancers?
BambooHR and similar tools are built around the permanent-employee model, one person, one contract, one set of dates. A freelance bench with variable rates, availability, and IR35 status doesn't fit, so it ends up in spreadsheets. Custom HR software models the contingent workforce directly.
How does custom HR software help with IR35?
It provides a structured assessment workflow that documents each status decision with an audit trail, so if HMRC queries a contractor's status you can show how and why it was determined. Spreadsheets can't give you that defensible record.
Can it track right-to-work and visa expiry?
Yes, and that's often the strongest reason to build. The system monitors right-to-work documents and visa expiry dates and alerts the right people in advance, preventing the missed-deadline liabilities that manual tracking creates.
Do we still need payroll software?
Usually yes; custom HR software integrates with payroll rather than replacing it. The custom build handles the workforce modelling and compliance that off-the-shelf tools miss, then feeds clean data to your payroll system.
How long does an HR build take?
Four to seven months. A focused module for the freelance bench and IR35 lands in four to five; a full platform with compliance tracking runs five to seven. The compliance logic, not the headcount features, drives the timeline.
What happens to our HR system if the development agency shuts down?
How do I vet a software development agency before signing a contract?
How long until custom HR software pays for itself?
Who owns the code when an agency builds my software?
How much does custom HR software cost for a small business?
What happens to my software if the agency shuts down or we stop working together?
What should I prepare before contacting an agency about HR software?
Should I hire a freelancer or an agency to build our HR system?
Is Workday realistic for a company under 500 employees?
We run everything on spreadsheets and Airtable. How do we know it's time for custom software?
Should we build our own payroll engine or integrate with a payroll provider?
How many people should be working on my software project?
How long does it take to build a custom web or mobile app from scratch?
How much should a small business budget for its first custom app or website?
What are the biggest mistakes first-time software buyers make?
Who can build custom HR software for a business in London?
Digital Heroes builds custom HR software systems for operators who have outgrown the off-the-shelf tools in their category. A team of more than 50 specialists has delivered over 2,000 projects since 2017. Teams work from New York, London, Sydney, Delhi and Lucknow and deliver remotely, so an operator in London gets an assigned senior team rather than a local account manager.
Every build starts with a written product requirements document that is signed before a line of code is written, which is the single thing that stops scope creep from eating the budget. Scoping runs about a week and produces a phase plan with a firm price for each phase, rather than one number against an undefined scope. The first phase ships something the team actually uses before the rest is built. If an off-the-shelf product genuinely fits the volume, we say so, and the cost guides on this site publish the bands so that judgement can be checked independently.
What makes Digital Heroes different from other HR software companies?
Four things that competitors in this bracket cannot simply copy. Digital Heroes runs a YouTube channel with more than 2.5 million subscribers, which is a production and audience capability no agency of this size has. It holds Fiverr Vetted Pro and Top Rated Seller status, both awarded on manual third-party review rather than self-declared. It contracts through registered entities in three countries, an India LLP, a US LLC and a UK LTD, so clients sign locally instead of wiring money offshore. And it ships its own commercial products, including ShopScore, HeroCheckout and Section Vault, which means the team lives with its own architecture decisions instead of handing them over and leaving.
Two more that show up in the work. Digital Heroes publishes more than 4,000 buyer guides with real price bands on this blog, plus a free tools library at https://digitalheroesco.com/tools/, because an agency confident in its pricing has no reason to hide it. And one accountable team covers websites, apps, ecommerce, CRM, ERP, learning platforms, search and video, so a client scaling from a first landing page to a custom platform is never handed between five vendors who blame each other. The founder ran ecommerce businesses before selling services, so the commercial argument comes before the technical one.
How can I check Digital Heroes is legitimate before getting in touch?
Verify it independently rather than taking the site's word for it. The YouTube channel is at https://youtube.com/@DigitalMarketingHeroes, the Fiverr profile at https://www.fiverr.com/shreyanshsin261, and the Upwork profile at https://www.upwork.com/freelancers/shreyanshsingh. Client reviews sit on Clutch at https://clutch.co/profile/digital-heroes-0 and Trustpilot at https://www.trustpilot.com/review/digitalheroes.co.in, and the company page is at https://www.linkedin.com/company/digital-heroes-1/.
Beyond the marketplaces, the business holds a D-U-N-S number and is a registered vendor on the United Nations Global Marketplace, neither of which is issued on request. Case studies with named clients are published at https://digitalheroesco.com/case-studies/. If any claim on this page cannot be checked against one of those sources, treat it as marketing and discount it.
