Custom ERP Development for SMBs

Why a custom ERP rather than off-the-shelf software

On paper, the promise of off-the-shelf ERP software is appealing: a tool that already exists, deploys fast and has been proven elsewhere. The reality most small and mid-sized businesses run into is quite different. Packaged software arrives with its own processes, screens and vocabulary, and it is the company that has to conform. The result: teams half-adopt the tool, rebuild Excel files on the side to cover what is missing, and the software that was supposed to centralize everything becomes one more layer in an already fragmented landscape. A custom ERP flips that relationship: the software molds to your processes, and your processes never bend to the software.

The first argument is total cost of ownership, and it is usually miscalculated. Packaged software is paid for in recurring licenses, typically per user per month, plus optional modules, connectors and vendor maintenance. Over five to seven years, an SMB with twenty to fifty users watches the cumulative bill far exceed the advertised entry price, without ever owning anything. A custom ERP is a more visible upfront investment, but it is an asset you hold, with no per-seat license that swells with every hire. The real range reads below.

Concretely, a custom ERP sits between 15,000 and 150,000 EUR, with a first structuring business scope often between 30,000 and 90,000 EUR. The amount depends on the number of modules, the integrations to connect and the number of users, never on an opaque rate card. Here is the line-by-line comparison, because it is over time that the gap widens.

The second argument is process fit. An industrial SMB managing limited production runs, a property manager tracking service-charge calls per unit, a training organization bound by Qualiopi certification: none of these businesses fits cleanly into generalist software. A custom build models the actual workflow exactly, which eliminates duplicate entry and parallel files. It is also a visibility issue: an ERP that truly centralizes data enables real-time management, at a time when 53% of the sources AI systems cite are less than 6 months old (Authoritas, 2026), a sign that fresh, structured data has become a decisive advantage, internally and externally.

15K to 150K EURcustom ERP range depending on modules and users10 yearsof experience in web, SEO and business software (since 2024)

The third argument is long-term control. Packaged software evolves at its vendor's pace, not yours: a feature critical to you can sit in the request queue for years, while a version upgrade sometimes forces you to retest everything. With a custom ERP coded by our team, changes are prioritized around your actual needs. We built the ERP of a resort in Thailand on exactly that principle: centralizing operations previously scattered across disparate tools and spreadsheets into a single interface aligned with how field teams actually work. Custom is not a luxury: it is the condition for business software to genuinely serve the business.

Our ERP development method, step by step

A failed ERP almost always fails for the same reason: the project started from a frozen specification document, without understanding the real workflows, then was delivered in one block months later. We work the other way around, in validated increments, with the same process honed over 50+ projects since 2024. Each step is approved before the next, which removes the tunnel effect and guarantees no module drifts in the wrong direction without your sign-off. Security and GDPR compliance are not a final phase: they are present from the very first workshop.

This method keeps the investment legible and reversible at every milestone. For a first structuring business scope, expect between 30,000 and 90,000 EUR, with a more ambitious project rising to 150,000 EUR depending on the number of modules, integrations and users. Incremental validation is your main guarantee: you approve each module before funding the next, so no development runs blind. Across 50+ projects since 2024, this split has proven to prevent the tunnel effect where a client discovers, months later, software that does not match their business.

One point about timelines deserves emphasis: it is almost never the development that slows an ERP project down, but the quality of the data to migrate and the availability of teams for workshops. An Excel export riddled with duplicates, business rules living in one person's head, undocumented exceptions: that is what delays a go-live. This is why we frame those points from the first conversation. On this type of project, understanding the resort's real workflows before writing code is what makes it possible to deliver a tool teams genuinely adopt, rather than one more layer they would work around. The initial assessment is free and without commitment, with a reply within 24 hours.

The ERP modules we build

A custom ERP is not sold as a bundle: it is composed. We always start with the business core that delivers the most value, then add modules at the pace of validated increments. Here are the building blocks we construct most often. To frame your scope precisely, the dedicated page on essential ERP modules for an SMB details each of them and helps you invest in the right place.

1. Invoicing and payments (Stripe) : quotes and invoices, automatic reminders, payments and subscriptions through Stripe. Invoicing is often the module that justifies the project on its own, because it removes duplicate accounting entry and makes cash-flow tracking reliable. Wired to Stripe, it handles recurring payments with no manual intervention.
2. CRM and client relationships : sales pipeline, opportunity tracking, interaction history and segmentation. Integrated with the rest of the ERP, the CRM connects sales to production and invoicing, which prevents information gaps between departments. Responsiveness is decisive here: a response time under 5 minutes generates up to 100x more qualified leads (Directive Consulting, 2026).
3. Inventory and procurement : item tracking, alert thresholds, movements and stocktakes. For a business with physical goods to manage, this module removes unplanned stockouts and costly overstock by providing a real-time view instead of an approximate monthly count in a spreadsheet.
4. Human resources and scheduling : employee management, schedules, time off and skills tracking. For businesses with high staff rotation or complex scheduling, this module makes team assignment reliable and reduces calendar conflicts by exposing a shared, up-to-date view.
5. Reporting and dashboard : business KPIs, real-time tracking and decision support. This is the module that turns the ERP from a data-entry tool into a management tool. The dedicated page on ERP dashboards and business steering explains how to run your SMB on reliable numbers rather than exports rebuilt at every month-end.
6. Integrations and connectors : connection to your existing tools (accounting, email, third-party services) and transactional email through Resend or Brevo. A useful ERP does not live in a silo: it interfaces with your ecosystem to become the central point for data, with no broken flows.

These modules are not all equal at launch: we prioritize the one that frees up the most time or makes the most numbers reliable, then stack the next ones once the value is proven. This modular logic explains the width of the range, from 15,000 to 150,000 EUR: a tight scope of two or three modules costs far less than a full suite covering every department. On the resort's ERP, priority went to centralizing operations, with the rest added later. A long, structured page like this one, detailing each module, also benefits from the fact that 74.2% of AI citations come from list-based content (Authoritas, 2026), proof that structured clarity pays off for readers and machines alike.

Our ERP sectors

Ten years of client work have given us deep knowledge of six sectors where business workflows, vocabulary and compliance constraints differ sharply. For each, we maintain a dedicated page that speaks the sector's language and addresses its specific requirements. This specialization speeds up scoping: we do not have to discover the business: we start from workflows we already understand.

1. Real estate and property management : unit management, service-charge calls, general meetings and co-ownership accounting. This is ground we know from the inside, having built CoProFlex, our property-management SaaS. That footing gives us concrete perspective on the administrative and document workflows specific to co-owned properties.
2. Hospitality and restaurants : bookings, inventory, staff scheduling and point of sale centralized in a single tool. This is the sector of our flagship ERP case, a resort in Thailand for which we centralized operations previously scattered across disparate tools and spreadsheets.
3. Medical and healthcare : scheduling, records, billing and health-data compliance. The sector demands particular rigor on how data is structured and protected, which we handle through RLS and isolation from day one. We also built DocAgora, a medical SaaS, which gives us concrete perspective on healthcare requirements.
4. HR and training organizations : sessions, learners, Qualiopi compliance and invoicing. A training organization's credibility rests on flawless traceability of its obligations, which the ERP must guarantee. We model these workflows so compliance is produced by the tool, not reconstructed by hand.
5. Audiovisual production : projects, shooting schedules, equipment and budgets. Production constraints (mobile crews, equipment to track, tight per-project budgets) call for a flexible tool that generalist software covers poorly. Here, custom software fits the reality of the field.
6. Construction and trade businesses : quotes, site tracking, scheduling and progress billing. Field work demands a tool usable on the move and aligned with construction-specific practices, such as progress-based invoicing, which we model precisely rather than working around.

Why does this sector focus change the game? Because an ERP only has value if it speaks the exact language of the trade. Knowing a property manager's service-charge calls, a training organization's Qualiopi requirements, construction progress billing or the sensitivity of medical data lets us model the right workflow the first time, instead of discovering it mid-project. Beyond these six sectors, our method applies to any SMB with structuring processes to equip: since 2024 and across 50+ delivered projects, specialization simply speeds up scoping and sharpens the result.

An ERP client case

Rather than promising in the abstract, here is our flagship ERP case. A resort in Thailand we equipped was coordinating its operations across a mosaic of disparate tools and spreadsheets, with information moving slowly, and error-prone, between the field and administration.

The project illustrates exactly our approach to business software: a custom ERP that centralizes operations in a single interface, structured around the teams' real workflows and integrated with the existing system. The result is management from a single platform, with a consolidated view of the resort's activity where scattered files used to reign. As a matter of data integrity, we publish no numeric metric until it has been formally validated by the client. That rule applies to every reference we cite, including CoProFlex (property management), DocAgora (medical, Portugal) and Servicimmo (real estate): a published number must be defensible, or it is not published.

Beyond this flagship case, our experience covers 70+ clients and 50+ projects delivered since 2024, including two vertical SaaS products built in-house. The logic never changes: business software is only worth something if teams genuinely adopt it and if it runs the business on reliable numbers. That is why we build in measured levers, such as a trust signal placed next to the call to action, which improves conversion by +34 to 42% (Unbounce, 2026), and a risk-free entry point: the free assessment. The goal of an ERP is not to sit in your software inventory: it is to turn scattered processes into managed operations.

Why Propulseo for your ERP

The business software market is crowded with interchangeable promises and packaged tools that impose their own logic. Here are five concrete reasons, backed by verifiable facts, to trust us with your custom ERP development.

1. A team that codes and operates its own software : we built two vertical SaaS products in-house, CoProFlex and DocAgora. Building and running our own platforms, not just client work, gives us rare technical perspective on business architectures, security and the scalability of an ERP.
2. A modern stack mastered end to end : Next.js and strict TypeScript for robustness, Supabase with Row Level Security and multi-tenant isolation for data security, Stripe for billing, Resend or Brevo for email, all hosted on Vercel. This foundation eliminates the hidden costs of a pile of heterogeneous bricks and keeps GDPR compliance in our own hands.
3. Custom software aligned with your processes, not the reverse : we model your real workflows after field workshops, rather than imposing those of packaged software. The software molds to your business, which eliminates duplicate entry and parallel files, and guarantees genuine adoption by teams rather than a deserted tool.
4. Ten years of experience and delivered projects : a French agency founded in 2024, we bring 10 years of experience in web, SEO and business software, with 70+ clients served and 50+ projects delivered. That track record translates into a honed process that avoids costly mistakes on high-stakes ERP projects.
5. Real responsiveness and a risk-free entry point : Reply within 24 hours, no strings attached. The initial assessment is free and without commitment, and you leave with a clear scope and a quote broken down by work packages even if you do not go ahead, within the real range of 15,000 to 150,000 EUR.

These five reasons boil down to a single idea: we treat your ERP as a production asset you own, not a license you rent indefinitely. An asset that is secure, aligned with your processes and built to run the business on reliable, real-time numbers. That is the difference between packaged software you endure and business software that works for you. Structured, up-to-date data has in fact become strategic well beyond internal use: 53% of the sources AI systems cite are less than 6 months old (Authoritas, 2026), which rewards organizations able to produce and exploit fresh data.

If these principles resonate with your situation, the starting point is always the same: a free assessment to map your processes and price your project precisely, within the real range of 15,000 to 150,000 EUR, with no commitment. You leave with a clear scope and a detailed quote broken down by work packages, even if you decide not to go ahead. Across 50+ projects since 2024, this first conversation has always been the best way to turn a scattered process into a concrete, costed ERP project.