ERP modernisation in Singapore
Your ERP still runs the business, but it sits on an old server, the version is out of support, and the real work happens in spreadsheets around it. We modernise it without a big-bang switch: wrap it with AI agents and modern screens, move it to a supported version, or replace it one module at a time while the old system keeps running.
SleekDigital builds custom ERP software in Singapore and AI agents that work inside existing systems such as SAP Business One and Xero.
Signs
Signs your ERP needs modernising
Most of the ERPs we see are 10 to 20 years old: an on-premise SAP Business One or Microsoft Dynamics install, a local accounting package stretched into an ERP, or an in-house system built by a developer who left years ago.
Routes
Four ways to modernise a legacy ERP
The right route depends on what is still sound in your ERP, not on what we prefer to build. We review it first and tell you which one fits, including when buying a package is the cheaper answer.
Keep the ERP
- AI agents that draft quotations, orders and supplier bills
- Web and mobile screens for sales, warehouse and site teams
- Connections to banks, e-commerce, WhatsApp and InvoiceNow
- Nothing posts to the ERP until a person approves it
Focused modules from about S$10,000
More on AI ERP that wraps SAP B1 or Xero
Move to a supported version
- Review which customisations still matter
- Rebuild integrations and reports on supported APIs
- Clean, map and move the data, with reconciliation
- We work alongside your vendor or partner, not in place of them
Vendor licence plus integration work, quoted after review
More on SAP Business One integration
Custom ERP you own
- Document the business rules buried in the old system
- Build one module at a time, old and new side by side
- Parallel runs until the reports reconcile
- You own the source code, with no per-user licence fees
Usually S$50,000 to S$200,000 over 3 to 6 months
More on custom ERP software development
Buy off the shelf
- Shortlist and compare vendors against your workflows
- Plan the data migration and cut-over
- Build only the gaps the package cannot cover
- We will tell you if this is the cheaper route
Package subscription plus migration, quoted after review
More on build or buy an ERP
| Route | Old ERP kept? | Disruption | What you own |
|---|---|---|---|
| Wrap | Yes, as the system of record | Lowest | You own the new layer; the ERP licence stays |
| Upgrade | Same vendor, new version | Medium, one planned cut-over | Vendor licence |
| Replace module by module | Until each module reconciles | Low per module, spread over months | You own the source code |
| Replace with a package | No, retired at go-live | Highest, one go-live date | Vendor subscription |
No big bang
Replacing an ERP one module at a time
A single go-live date for a whole ERP is where most of the risk sits. We move one module at a time and run old and new side by side, so staff switch over in stages and finance signs off the numbers before anything is retired.
Data and compliance
Moving the data out of an old ERP safely
Old ERPs carry years of duplicate customers, retired item codes and half-closed documents. We clean and map the data, rehearse the migration on a copy, and give finance reconciliation reports for stock, receivables, payables and GST before each cut-over. History that is only needed for reference can be archived in a searchable form instead of migrated. The full method is in our ERP data migration guide.
If you are GST-registered, plan for e-invoicing as part of the move. IRAS is phasing in the GST InvoiceNow Requirement between 1 November 2025 and 1 April 2031 (IRAS timeline as checked on 10 November 2026), depending on when you registered for GST and your total annual supplies. Many older ERPs cannot send InvoiceNow e-invoices on their own, so we check this in the review. The dates are listed in our ERP implementation checklist.
AI in the modernised ERP
AI does the reading. Your team decides.
AI speeds up the project itself and the daily work afterwards. Every rule, number and posting still has a person's name on it.
The AI drafts
- 01Documentation of the business rules found in old code, reports and spreadsheets
- 02Data mapping from old tables to the new model, and test cases from past transactions
- 03After go-live: quotations, sales orders and supplier bills from emails and documents
- 04Exception alerts when stock, an order or a payment is off track
Your team approves
- Every business rule before it is rebuilt
- Migration totals and each reconciliation report
- Each module cut-over and retiring the old ERP
- Prices, purchase orders and anything posted to the ledger
How we work
From ERP review to cut-over
01
ERP review
We map how the ERP is used today, the spreadsheets around it, its data and its customisations.
02
Route and phased plan
You get a recommended route, the order of modules, and a price and timeline for each phase.
03
First phase live
The first wrap or module goes live alongside the old ERP, so the business keeps running.
04
Parallel run
Old and new run side by side until stock, receivables and GST reports reconcile and finance signs off.
05
Cut-over
We retire the old module, archive its history in a searchable form, and stay on for support.
Cost
What ERP modernisation costs in Singapore
Phasing spreads the cost across modules, so you fund and prove each step before the next. We confirm a fixed price per phase after the review. Full ranges are in the ERP system cost guide.
The project may qualify for EDGE grant support. Enterprise Singapore decides eligibility and the support level, not SleekDigital.
A focused module moved off the old ERP
From about S$10,000
A custom ERP replacing a legacy system
Usually S$50,000 to S$200,000, over 3 to 6 months
An AI ERP, new or wrapping an existing one
S$50,000 to S$300,000+
Upgrade or package route
Vendor licence or subscription, plus integration and migration
Questions
ERP modernisation FAQs
ERP modernisation means moving an ageing ERP onto a supported, connected platform without losing the data and business rules inside it. It can mean wrapping the existing ERP with new screens and AI agents, upgrading to the vendor's current version, replacing it module by module with a custom system, or replacing it with a package.
No. If the core accounting and stock data are sound, wrapping the ERP is often the fastest and cheapest route: AI agents and modern screens sit on top and post to the ERP only after a person approves. We recommend a full replacement only when the old system blocks the work.
Yes. We phase the work so the old ERP keeps running. New modules go live alongside it, and we run both until the reports reconcile before anything is switched off.
It depends on the route. A focused first version of a custom ERP is possible in 8 to 10 weeks, and a full replacement usually takes 3 to 6 months. A first AI agent on top of an existing ERP is typically live in 8 to 12 weeks.
A focused module moved off the old ERP starts from about S$10,000. A custom ERP replacing a legacy system is usually S$50,000 to S$200,000, and an AI ERP runs S$50,000 to S$300,000+. Upgrades and packages add the vendor's licence or subscription. We confirm a price per phase after the review.
Yes, as long as you can give us access to the database and, ideally, the code or customisations. We read the data and code, interview the people who use the system, and compare old reports with new ones. AI-assisted code reading speeds this up, and every business rule is confirmed with your team.
Open transactions and master data are cleaned, mapped and migrated, with reconciliation reports for finance to sign off. Older history that is only needed for reference can be archived in a searchable form instead of migrated.
Modernising an in-house system that is not an ERP, such as an Access database or a VB6 app? See legacy software modernisation and our guide to rewriting or replacing a legacy system.
Next step
Not sure which route fits your ERP?
Tell us which ERP you run, how old it is and what your team works around. We will recommend a route and a phased plan with a price for each phase.