A software house is a company whose core business is building and maintaining software for clients: custom development, modernisation of existing systems, and the long-term care that keeps them running. Choosing the right one in Europe comes down to five things: verifiable proof of past work, engineering practices rather than promises, a clear owner for your system after delivery, compliance fluency with European rules, and a pricing model that matches how defined your project actually is.
That is the short answer. The rest of this guide unpacks how to check each point before you sign, from the perspective of people who sit on the supplier side of these conversations every week.
The term covers companies of very different shapes, so it helps to be precise. A software house builds custom software: systems designed around your processes, owned by you, developed by a team that does this for many clients. That is different from a product vendor (which sells you its software), a digital agency (whose centre of gravity is marketing and campaigns), a body shop (which rents you individual developers and leaves the engineering management to you), and a freelancer (one person, one bus factor).
None of those alternatives is wrong. They are wrong for certain projects. If what you need is a system your company will depend on for years, integrated with your operation and maintained as it evolves, you are shopping for custom development from a software house, and the criteria below apply.
The global outsourcing literature mostly assumes the choice is about hourly rates. For a European company, three other factors have become at least as important.
Regulation is physical. GDPR, NIS2 and the AI Act are not abstractions; they shape where data may live, how incidents must be reported and how AI features must be controlled. A software house in Europe works under the same rules you do, which shortens every compliance conversation. We wrote about the deeper layer of this in our article on digital sovereignty: your technology partner determines your legal exposure as much as your cloud does.
Distance is measured in working hours. Overlap matters more than geography. A partner one time zone away can join your Tuesday morning incident call; a partner eight time zones away answers while you sleep. For systems that run your operation, that difference shows up precisely on the worst days.
The relationship outlives the project. Custom software is not finished at go-live. Someone has to apply security updates, adapt the system when your business changes and answer for it when something breaks. Choosing a software house is choosing who that someone is for the next five to ten years, a point we covered in depth in our guide to outsourcing system maintenance.
Anyone can publish a portfolio. Ask for two or three clients whose situation resembles yours, and talk to them. The useful questions are not “was the project good” but “what happened when something went wrong” and “what is the system like to live with two years later”. A software house proud of its work connects you without hesitation; you can see how we present ours in our cases.
Ask how they test, how they review code, how they deploy, and what documentation a project leaves behind. The answers do not need to be exotic; they need to be concrete and routine. A partner who cannot describe their own process in plain language will not follow one under deadline pressure. Documentation deserves special attention: the test of good custom development is whether another competent team could take the system over from what is written down.
Maintenance is where custom software succeeds or fails financially. Before signing, you want to know: what does support cost, with what response times, and what happens to those terms over the years? Be suspicious of houses that treat maintenance as an afterthought; building and walking away is the business model that produces the orphaned systems we are regularly asked to rescue.
You are not hiring lawyers, but your software house should speak GDPR natively: data minimisation in designs, EU hosting options, processing agreements without drama, and honest answers about what NIS2 or the AI Act mean for your specific system. Certificates are fine; specific answers to specific questions are better.
Fixed price works when scope is genuinely fixed, which is rarer than everyone pretends. Time and materials works when the project will be discovered along the way, and rewards a partner you trust. Many healthy engagements mix the two: a fixed-scope first phase (an assessment or a first release) that lets both sides measure each other, then a longer arrangement once trust has data behind it. That staged approach is exactly why we offer a fixed-scope technology assessment as an entry point.
Hourly rates differ meaningfully across Europe and beyond it, and pretending otherwise would be silly. But the number that matters is cost per working system, not cost per hour. A cheaper team that needs more hours, more rework and more of your own staff’s time to manage is not cheaper. Our own model combines Belgian engineering leadership with teams in Europe and the Americas, which is one way to balance rate, overlap and quality; other balances are legitimate. What matters is that the software house can explain where the work happens and who is accountable, rather than treating it as a detail.
Dink is a Belgian software house serving companies across Belgium, the Netherlands and the wider EU. We do custom software development, we take over and maintain existing systems, including ones other suppliers built, and we integrate AI where it earns its place. We publish how we think on this blog precisely because criterion number two above cuts both ways: you should be able to inspect how a software house reasons before you ever talk to it. If this guide matches what you are looking for, our services page shows how engagements are structured, and the conversation starts with a message.
What is a software house?
A software house is a company specialised in building and maintaining software for clients: custom development of new systems, modernisation of existing ones, and long-term maintenance. It differs from a product vendor (sells its own software), an agency (marketing-centred), a body shop (rents individual developers) and a freelancer (a single person).
How is a software house in Europe different from offshore outsourcing?
Three practical differences: it operates under the same regulations you do (GDPR, NIS2, the AI Act), it works in overlapping hours, which matters most during incidents, and it is reachable under the same legal system if the relationship goes wrong. Offshore can still make sense for well-specified, lower-risk work; systems your operation depends on benefit from proximity.
How much does custom development cost in Europe?
It varies too much by country, seniority and project type for one honest number. The useful comparison is cost per working system over its life, including maintenance, rather than hourly rate. Get multiple serious bids for the same written scope, ask what is excluded, and be suspicious of any bid far below the rest.
Fixed price or time and materials for custom software?
Fixed price fits genuinely fixed, well-specified scopes. Time and materials fits discovery-heavy projects and requires trust. A staged model, with a fixed-scope first phase followed by a longer engagement once both sides have evidence, captures most of the advantages of both.
What should be in the contract with a software house?
Full ownership of code and deliverables, documentation as an explicit deliverable, maintenance terms with response times, data processing terms for GDPR, the named composition of the team, and a clean exit clause covering handover. If a supplier resists the exit clause, that is your answer about lock-in.
Evaluating partners for a custom development project, or inheriting a system that needs a new home? Start with a fixed-scope technology assessment, or get in touch.
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