How much does custom software cost in Spain? (2026)

«How much does custom software cost» is the first question every manager asks and the one most vendors answer with «it depends». It does depend — but the market publishes anchors. Here they are, with named sources, for Spain in 2026.

The price band agencies actually quote

WebsDirect, a Madrid software-development agency with 25+ years and 500+ delivered projects, publishes its band in its own FAQ: from €6,000 for a concrete automation or tool to more than €100,000 for an integral management system with multiple modules and integrations. The price depends on functional scope, integrations with your existing systems and methodology. Their process: a free diagnostic, then a detailed phase-by-phase proposal with estimated hours and a closed price in 24–48 hours — no black boxes.

That band matches the shape of the market: single-automations and internal tools sit in four figures; departmental portals and SaaS products in the low tens of thousands; multi-module systems connected to SAP, Salesforce or Odoo start around six figures.

How long it takes (the calendar is part of the price)

Same source, same FAQ:

Agencies working in fortnightly sprints show you working software every two weeks and let you reprioritise without a change-order fight — that is part of what the quote buys.

The freelance alternative: day rates on the record

If a project quote feels too big, the marketplace route prices people, not projects. Malt, Spain's largest freelance marketplace, publishes its rate barometer: back-end developers average €305/day (based on freelancers active in the last 3 months), and by seniority:

Specialties move the needle: Scala bills €380/day, Python €328, full-stack €321, PHP €275 (our own arithmetic, labeled: a fully booked senior at 220 billed days invoices ~€67,000 a year — before gaps between projects, which are the freelance risk you absorb).

Every figure in this section was read from Malt's public barometer in September 2026. Day rates are what the freelancer receives; agencies add their margin on top when they staff your project with contractors.

The route the quote must be compared against: an in-house team

The third way to get custom software is the most expensive and sometimes still the right one: hiring the team. Our verified cost breakdown: junior developers cost €22,000–30,000 gross, seniors €48,000–80,000 (10Code/Glassdoor/InfoJobs compilation; €63,018 market average per ERI, Aug 2026), employer social-security contributions add ~31% (Order PJC/297/2026 + MEI), and a realistic minimum team of three runs ~€169,000/year in real employer cost — ~€204,000 in Madrid (+22%).

The same money buys a lot of external capacity: our own arithmetic, labeled — a Madrid senior's real cost (~€85,000/year) equals roughly 279 days of a €305/day senior freelance, or most of a full-time year plus a second mid-level for key months. The trade-off is the reverse: the freelancer leaves when the project ends; the employee stays. You buy capacity or you buy permanence.

The costs after the invoice: maintenance and your own hours

• Maintenance and evolution: 10–20% of the build per year is the standard budget rule. On WebsDirect's own band: €600–1,200/year for a €6,000 tool, €3,000–6,000 for a €30,000 project, €10,000–20,000 for a €100,000 system (our arithmetic, labeled — WebsDirect includes a warranty period and sells ongoing evolution but publishes no maintenance price). Regulation makes this non-optional: a change like VeriFactu forces adaptation on the regulator's calendar.
• Your hours. No vendor escapes it: someone in your company writes requirements, validates the prototype, tests each sprint and owns acceptance. Budget a half-day a week minimum, more during the diagnostic.
• Integrations decide the top of the band. Connecting SAP, Salesforce, Odoo, Sage or Holded is where projects climb from four to six figures — audit what your new software must talk to before asking for quotes.

Four checks before you sign any quote

1. Is the price closed or an estimate? WebsDirect's model (closed price per phase after a free diagnostic) is the one to demand; open time-and-materials quotes are how €20,000 projects become €50,000.
2. Who owns the code? 100% client ownership plus full repository and technical documentation should be the default — it is what lets you change maintainers later.
3. What does maintenance cost after year one? If it is not in writing, the 10–20% rule is your budget line, not theirs.
4. Does the timeline include you? 4–6 weeks to prototype assumes your feedback arrives — the calendar slips when validations wait on the client.

In summary

A custom software project in Spain costs €6,000–100,000+ depending on scope (agency band, WebsDirect 2026), ships a prototype in 4–6 weeks and an MVP in 2–4 months, and bills freelancers at €180–354/day on the Malt barometer. Add 10–20% a year in maintenance and your own specification hours. If the software runs your operation and is not your core differentiator, there is a fourth route: a partner that builds and operates the system for a fixed price. See our two decision guides — build vs buy custom software and the software agency alternative — and how ZUI Technology runs 8 products in production, including HostAgentes, managed EU infrastructure for AI agents.