Your London ERP stops where the agency P&L meets the FCA-regulated entity
Custom ERP (Enterprise Resource Planning) development in London typically runs £90k to £260k over 5 to 9 months. You build custom when a packaged ERP can't model a Square Mile group with regulated and unregulated entities, multi-currency client billing, and a creative-agency revenue cycle in one ledger. Most London finance teams don't need to replace NetSuite or SAP wholesale; they need a custom layer that makes the consolidation and the FCA-reportable entity stop fighting the agency P&L.
You bought NetSuite or SAP to be the single source of truth, and instead your London group close takes eleven working days because the regulated fintech entity, the media-buying agency, and the EU subsidiary each post differently and nobody trusts the intercompany eliminations. Microsoft Dynamics handled the GL fine until media rebates, deferred agency retainers, and FX on dollar-denominated SaaS contracts turned every period-end into a spreadsheet rescue mission.
Odoo looked affordable for a 60-person Shoreditch firm, but the moment you needed project-level profitability across time-tracked client work, recoverable disbursements, and VAT on cross-border digital services, the off-the-shelf chart of accounts started bending in ways your auditor flagged. The tools aren't broken. They were built for a manufacturer with a warehouse, not a London services group billing time and reconciling it against milestones.
- You run two or more legal entities where at least one is FCA-regulated and consolidation is manual
- Your revenue is time-based or retainer-based and standard ERP revenue recognition fights it
- Month-end close consistently exceeds a week because of intercompany or FX adjustments
- Project profitability lives outside the ERP in spreadsheets nobody trusts
- You're a single-entity firm with straightforward GBP billing and no regulated arm
- NetSuite or Dynamics already closes your books in under four days
- Your revenue model is simple product or subscription with no deferred media or disbursements
- You lack internal finance capacity to spec and test a custom consolidation engine
- Month-end close drops from 11 days to 3 to 4 because intercompany eliminations and FX revaluation run as coded rules, not manual journals
- Real-time project profitability across billed time, cost, and recoverable disbursements feeds straight from your time-tracking system
- The FCA-regulated entity stays cleanly ring-fenced for reporting without three separate exports
- Revenue recognition for retainers and deferred media follows your contracts automatically, audit-ready
- One consolidated view your CFO trusts on day three, not a spreadsheet they rebuild every quarter
- A custom consolidation engine needs ongoing maintenance as FRS 102 and FCA reporting rules change; budget for a retainer
- You take on responsibility for tax-table and VAT-logic updates that NetSuite would have shipped for you
- Migration of historic ledgers from SAP or Dynamics is genuinely hard and where most of the timeline risk sits
- If your group is stable and single-entity, you may be paying for flexibility you'll never use
The honest cost picture for London
| Project scope | Typical cost | Timeline |
|---|---|---|
| Custom consolidation + reporting layer on top of existing ERP | £70k to £130k | 4 to 6 months |
| Full custom ERP for multi-entity London services group | £160k to £260k | 7 to 9 months |
| Project-revenue and time-to-billing module only | £45k to £85k | 3 to 4 months |
Feature priorities for London teams
London ERP: the full scope
The engagements London teams bring us most often: NetSuite customization, SAP integration, Odoo development, Microsoft Dynamics 365, ERP migration, cloud ERP and manufacturing ERP.
Exactly what you get
A consolidation and reporting layer that sits over your existing NetSuite, SAP, or Dynamics GL and does the work your finance team does by hand: automated intercompany eliminations across your London entities, scheduled FX revaluation on USD and EUR balances, project-level profitability fed from time-tracking, and an FCA-entity reporting pack that exports clean. You keep the packaged ledger where it earns its keep and replace only the month-end spreadsheet chaos with coded rules your auditor can trace.
How to choose a developer in London
Hire a team that has shipped finance systems for a regulated London group, not just an e-commerce store. Ask them to walk you through how they'd model your weakest reconciliation, the one that eats the most days at close. The right partner talks about FRS 102, intercompany logic, and your real chart of accounts in the first meeting. The wrong one talks about dashboards. Pair the ERP work with your CRM (Customer Relationship Management), accounting software, and business intelligence (BI) dashboard plans so the consolidation has clean data flowing in from day one.
Timeline: what happens, and when
- !They quote a fixed price before seeing your intercompany structure; ask how they handle FCA-entity eliminations specifically
- !No one on the team has touched FRS 102 consolidation; ask for a London services-group reference
- !They propose rebuilding your GL from scratch; ask why they won't keep what works in NetSuite
- !Migration is hand-waved as 'we'll import the CSVs'; ask for their reconciliation test plan
- !They can't explain how they'll handle USD/EUR FX revaluation; ask to see the journal logic
If ERP is on the roadmap, internal tools, shopify, inventory management usually follow within the year. Budget them as one conversation. Weighing options across the region? We publish the same ERP guide for Birmingham, Manchester, Liverpool. Digital Heroes builds this in-house, see our ERP development service.
The evidence behind this guide
Independent findings on why this investment pays off. Every link goes to the primary source.
- 48% of private companies cite integration with legacy systems or technical debt as a top obstacle to realizing the full value of their digital and AI investments (behind data quality/availability at 72% and gaps in AI fluency or technology talent/leadership at 53%). Source: Deloitte (2026) →
- McKinsey found that tech debt can amount to 20-40% of the value of a company's entire technology estate before depreciation, and CIOs report that 10-20% of the budget for new products is diverted to resolving tech-debt issues. Source: McKinsey & Company (2020) →
- A later Nucleus Research review of analytics software ROI case studies found customers received $9.01 in benefits for every dollar spent on analytics technology, showing returns vary with deployment factors but remain strongly positive. Source: Nucleus Research (2019) →
- In an October 2025 survey of 530 small-business employers (conducted by TechnoMetrica, October 3-9, 2025), 88% reported using AI tools and 73% said those tools had been important to their competitiveness and growth over the past year, with 60% citing efficiency and productivity as the primary motivation for adoption (42% cited improving customer service). Source: Small Business & Entrepreneurship Council (SBE Council) (2025) →
Rishabh builds and maintains client storefronts and marketing sites, including Shopify theme work. Product pages, checkout flows and the small template changes a retailer asks for on a Friday all land with him. Readers get the practical detail of what is easy to change on an ecommerce site and what is not.
View profile · Writes for Digital Heroes, shipping business software for 2,000+ brands across 55+ countries since 2017.
Frequently asked questions
Can I keep NetSuite and still build custom?
Yes, and for most London groups that's the right call. You keep NetSuite as the transactional GL and build a custom consolidation, FX, and project-revenue layer on top. It's cheaper and faster than a full replacement and avoids re-migrating data that already works.
How long does a custom ERP build take for a London firm?
Five to nine months end to end. A consolidation-only layer over an existing ERP lands in four to six; a full multi-entity build for a regulated group runs seven to nine, with most of the risk in migrating historic SAP or Dynamics ledgers.
Why won't off-the-shelf ERP handle our agency revenue?
Packaged ERPs model product and subscription revenue well but struggle with time-based retainers, deferred media spend, and recoverable disbursements. London agencies and services firms end up booking those by hand every month, which is exactly what custom revenue-recognition logic eliminates.
What does FCA-entity ring-fencing actually require?
Your regulated entity needs to report on its own permissions and capital position without contamination from the unregulated arms. A custom ERP keeps those entities cleanly separated in the consolidation so you can produce the regulated pack without three manual exports.
Is this worth it under £100k of finance overhead?
If your close is under four days and you're single-entity, probably not. The case strengthens fast once you have two or more entities, a regulated arm, and a month-end that needs a spreadsheet rescue. That's when the manual reconciliation cost outruns the build.
What happens to my ERP if the agency shuts down or we part ways?
How do I vet a software development agency before signing a contract?
Who owns the source code if an agency builds my ERP?
What happens to my software if the agency shuts down or we stop working together?
How do I calculate whether custom software will pay for itself?
Can a freelancer build an ERP, or do I need an agency?
How do we migrate years of data from our old system without losing anything?
Will a custom ERP scale as we grow from 50 to 500 employees?
Who owns the code when an agency builds my software?
How many people should be working on my software project?
Who can build custom ERP software for a business in London?
Digital Heroes builds custom ERP 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 ERP 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.
