The short answer: custom software costs whatever the hours needed to build, test, deploy and maintain it cost. Those hours depend on scope, on integrations with other systems and on the level of quality and security your business needs. Two projects that sound alike (“a CRM”, “an ordering app”) can end up with very different budgets.
So be wary of any fixed price given before anyone has looked at your processes. This guide explains what drives the cost of custom software development, how it is usually contracted, what it costs after delivery and how to request quotes you can actually compare.
We don’t publish price ranges here. We have not found a public, verifiable study of custom development rates in Spain, and most figures online are estimates published by vendors. Instead, we explain how the price is built so you can judge any quote you receive.
What drives the price of custom software
The final cost is the number of hours per role (analysis, design, development, testing, operations) multiplied by each role’s rate. These are the factors that move the number of hours the most:
| Factor | What makes it more expensive | What makes it cheaper |
|---|---|---|
| Functional scope | Many roles, workflows and exceptions | One well-defined process |
| Integrations | ERP, accounting, payment gateways, poorly documented third-party APIs | Few external systems, or standard APIs |
| Data migration | Scattered, messy legacy data | Starting fresh, or already structured data |
| Platforms | Web + iOS + Android + offline mode | A single responsive web app |
| Non-functional requirements | High availability, high volume, audit trails, e-signature, industry regulation | Internal use with few users |
| Clarity of requirements | Requirements that change mid-project | A client-side owner who makes decisions quickly |
| Interface design | Bespoke visual design and user testing | An existing design system |
Two factors are almost always underestimated at the start:
- Integrations. Connecting to an external system means understanding its API, its limits and its failure modes. A single badly documented integration can cost more than several screens of the app.
- Data migration. Moving customers, history or invoices out of spreadsheets or an old program means removing duplicates and deciding what to keep. That is analysis work, not just code.
How much does a custom CRM cost?
A custom CRM follows the same logic. The price depends mainly on how many processes it covers (sales, quotes, invoicing, support, scheduling), what it integrates with (email, accounting, website, telephony) and how many user types and permissions it needs.
Before asking for a quote, check whether an existing industry-specific CRM already covers most of your processes. If it does, configuring it and building only what is missing usually costs less than building everything from scratch. More on that below.
Engagement models: fixed price, hours bank or dedicated team
The engagement model decides who carries the risk of uncertainty. None of them is best in every case.
| Model | How it works | When it fits | Main risk |
|---|---|---|---|
| Fixed price | Scope, timeline and price set in the contract | Small projects or very clear requirements | The vendor adds a margin for uncertainty and every change becomes a change request |
| Hours bank | You buy a block of hours used up by tasks | Evolving an existing product, improvements and maintenance | Without tracking, hours get used without a clear goal |
| Dedicated team | A team works for you continuously for a periodic fee | Products that will evolve for years | Your company needs someone who prioritises and decides |
A common approach is to combine them: a fixed-price discovery phase that produces a scope document and a reliable estimate, followed by iterative development or an hours bank.
Project phases and where the budget goes
A well-run custom software project goes through these phases. Skipping one does not save money; it moves the cost to a later phase, usually with interest.
- Discovery and analysis. User interviews, process mapping, requirements and priorities. The output is a scope you can price.
- Design. Technical architecture, data model and screen prototypes. This is where integrations are decided.
- Iterative development. Short deliveries you can test. With an agile process you see working software within the first weeks and can change course early.
- Testing. Automated tests, user acceptance testing and, if the data is sensitive, a security review.
- Go-live and migration. Deployment to the chosen infrastructure, data load and training.
- Maintenance and evolution. Bug fixes, updates and new features.
The cost missing from the initial quote: maintenance
Software is not finished on delivery day. There are recurring costs you should plan for from the start:
- Infrastructure: servers or cloud services, backups, domains and certificates.
- Corrective maintenance: fixing bugs that show up in real use.
- Adaptive maintenance: updating libraries, frameworks and operating systems. An outdated dependency is a security risk.
- External changes: a third-party API releases a new version, a tax rule changes the invoice format, a browser drops support for something.
- Evolution: new features the business asks for once people start using the tool.
- Support: user help and monitoring.
Ask the vendor to break these costs out with the same level of detail as the build. A very low development quote paired with expensive or undefined maintenance is not a good quote.
Alternatives: vertical SaaS or custom software
You don’t always need to build from scratch. Compare these options first:
| Option | Pros | Cons |
|---|---|---|
| Generic SaaS | Available now, monthly fee, no maintenance on your side | You adapt your processes to the tool |
| Vertical SaaS (built for your industry) | Industry logic already included, usable from day one | May not cover processes unique to your company |
| Vertical SaaS + custom extensions | A proven base plus what makes you different | Depends on the vendor allowing extensions and integrations |
| Custom software | Fits your processes and you control the roadmap | Higher upfront investment and maintenance on your side |
A useful rule: build what sets you apart from competitors and buy what is the same for everyone. Accounting rarely justifies custom development; the way you plan your operations sometimes does.
At LCApps we work both ways. We have ready-to-use SaaS platforms for sales management, hearing care centres and other industries, and we do custom software development when none of them fits.
Who owns the code?
This affects long-term cost and many companies never check it. Under Spanish copyright law, software created by an employee in the course of their duties belongs to the employer unless agreed otherwise (article 97.4 of the Spanish Intellectual Property Act). That presumption does not cover an external vendor.
If you hire a software development company, put in writing which exploitation rights it assigns to you, over which parts and with what scope; Spanish law requires any assignment to be in writing (article 45). Other jurisdictions have their own rules, so check the law that governs your contract. Also ask whether the vendor reuses its own components: that is normal and lowers the cost, but the licence under which you use them must be clear.
If the software processes personal data and the vendor has access to it (for example, because it hosts or maintains the system), you need a data processing agreement under Article 28 of the GDPR.
How to request a custom software quote you can compare
If every vendor gets the same information, you can compare their answers. Prepare a short brief with:
- The business problem, not the solution: which process you want to improve and how you do it today.
- Users and roles: who will use the system and what each can do.
- Priority processes: separate what the first version must have from what can wait.
- Systems it must integrate with, and whether they have an API.
- Data to migrate, its format and volume.
- Constraints: deadlines, industry regulation, where the data must be hosted.
- Available budget, or at least an order of magnitude, so the vendor can propose a realistic scope.
And ask every proposal for:
- A breakdown by phase and role, not a single number.
- Assumptions and exclusions: what is not included.
- How scope changes are handled.
- Maintenance, infrastructure and support costs after delivery.
- Assignment of rights over the code and access to the repository.
- Similar projects you can check.
If your project includes automating tasks with AI, also read our guide to AI agents for business: the cost and risks of that part are assessed differently.
FAQ
Why are two quotes for the same software so different?
Usually because each vendor understood a different scope. One includes testing, migration and deployment; the other only development. Compare assumptions and exclusions before comparing totals.
Can I start with a small budget?
Yes, if you limit the first version to one process that delivers value on its own. Then you extend it in iterations, guided by real usage data.
How long does custom development take?
It depends on the same factors as the price. A reliable timeline only comes out of a discovery phase. Be wary of fixed deadlines given without reviewing your processes.
Conclusion
The price of custom software is not a catalogue figure. It follows from a scope, a set of integrations and a quality level. Define the problem well, compare quotes built on the same information and plan for maintenance from day one, and you will avoid the most expensive surprises.
Want to know what your project would cost? Tell us what you need and we will help you define the scope and decide whether custom development or an existing solution suits you better.