Replacing or upgrading your builders merchant software is one of the biggest operational decisions a merchant makes. Get it right and the whole branch runs more smoothly; get it wrong and you live with the friction for a decade. If you are weighing up a new system, the shortlist in the UK usually comes down to a few established ERP platforms, and one question almost nobody asks until later: what does the software actually do when your team is not driving it?
This is an honest comparison of the main builders merchant ERP options and where a newer category, the AI agent layer, fits alongside them.
The main builders merchant ERP options
Kerridge Commercial Systems (K8). K8 is the best known ERP for builders, timber and plumbers merchants in the UK. It is a comprehensive system of record covering stock, pricing, the trade counter, accounts and ecommerce, and it is built specifically for the sector. For many merchants it is the default choice for the transactional core.
Ibcos. Long established in dealer and distribution software, with deep roots in agricultural and equipment dealers, Ibcos also serves merchants as a system of record for stock, sales and accounts. It is a mature, dependable platform for businesses that fit its model.
Intact iQ. A flexible, configurable ERP aimed at wholesale, distribution and merchant businesses. Its strength is adaptability, it can be shaped around less standard workflows, which appeals to merchants who have outgrown a rigid system.
These are all credible platforms, and the right choice depends on your size, your existing processes and your appetite for change. But there is a limitation none of them fully solves, and it is not their fault, because it is not what an ERP is for.
What every builders merchant ERP does well
A good ERP is a system of record. It tells you what you have in stock, what it costs, what a customer owes, and what happened yesterday. It keeps the branch running and the accounts straight. That is essential, and modern merchant ERPs do it well, with trade counter tills, pricing matrices, credit management and, increasingly, ecommerce built in.
The gap every builders merchant ERP shares
An ERP records; it does not act. It waits for a member of staff to query it, raise the quote, chase the invoice or answer the customer. That leaves three gaps open in every merchant, whichever system you run:
- Sales that arrive when no one is there. Out of hours website enquiries go unanswered and the order goes to whoever replies first.
- Billing and query admin that never ends. Disputed invoices, proof of delivery requests and pricing questions consume experienced staff hours.
- Knowledge locked in people’s heads. When a key colleague is off or leaves, the answers about stock, accounts and process go with them.
No ERP upgrade closes these gaps, because acting on data in real time is not what a system of record is designed to do.
Optiflow: the AI layer, not another ERP
This is where Optiflow Merchant is different. It is not an ERP and not a rip and replace of Kerridge, Ibcos or Intact. It is an AI agent layer that sits on top of the system you already run and takes action on your live data: an AI sales agent that converts out of hours enquiries, billing and credit control agents that clear routine queries automatically, and an internal knowledge assistant that makes institutional knowledge available to every member of staff in seconds. For the full picture, see our guide to AI builders merchant software.
Do you need a new ERP, or the AI layer on top?
If your current system genuinely cannot handle your stock, pricing or accounts, a new ERP may be the right move, and Kerridge, Ibcos and Intact are all worth evaluating. But if your core system works and your real losses are unanswered enquiries, slow billing and knowledge walking out the door, replacing the ERP will not fix that. Adding an AI layer will, faster, cheaper and without the disruption of a full migration.
The bottom line
Choosing builders merchant software is not only about which ERP records your data best. It is about what your software does when no one is watching. Whichever system of record you run, the merchants pulling ahead in 2026 are the ones adding an AI layer that actually does the work.
Want to see what an AI layer would capture on top of your existing system? Speak to our team.
Weighing up a specific switch?
If you’ve narrowed it down and you’re actively considering moving off one of these systems, we’ve written a straight, no hard sell guide for each, covering the real like for like options and when a switch is (and isn’t) worth it: looking for a Kerridge K8 alternative, looking for an Intact iQ alternative, and looking for an Ibcos Gold alternative. Each one explains the same core point this comparison lands on: for most merchants, the fastest fix isn’t replacing the ERP, it’s adding an intelligent layer on top of it.