Custom software development cost is mostly the price of skilled people's time: analysis, design, development, testing and project management, multiplied by their rates. That is why two projects that sound similar can differ several times in cost. What changes the total is scope, complexity, the number of integrations, quality and security requirements, and how clear the requirements are at the start.
We do not publish a price list here, because any single number for custom software would mislead you. What we can do is explain what you are paying for, how estimates are built, what raises or lowers them and how to budget for the years after launch. The worked example below uses assumed hours and rates so you can see the arithmetic and replace it with your own.
What you are paying for
A software project is a sequence of activities, and each takes time.
- Discovery and requirements: understanding the process, users, data and constraints.
- Design: the user interface, data model and technical architecture.
- Development: building features, integrations and administration screens.
- Testing: checking features, edge cases, performance and security.
- Deployment: setting up hosting, environments, data migration and release.
- Project management: planning, communication, changes and reviews.
In our experience, coding is only part of the effort. Teams that quote only for coding tend to overrun when testing, integration and change requests arrive.
The main cost drivers
These factors move the estimate more than any other. Look at your own project against each one.
| Driver | Lower cost | Higher cost |
|---|---|---|
| Scope | One workflow, a few screens | Many roles, modules and reports |
| Integrations | Standalone tool | Several systems, each with its own interface |
| Data migration | Start with clean data | Years of messy records to clean and import |
| User roles and permissions | One or two simple roles | Many roles, approvals and audit requirements |
| Security and compliance | Internal tool, low-sensitivity data | Personal or financial data, audits, certifications |
| Platforms | Web only | Web plus mobile apps or offline use |
| Design effort | Standard interface components | Custom branded experience |
| Requirement clarity | Written, tested with users | Vague, changing as work proceeds |
How estimates are built
A credible estimate breaks the project into features, estimates the effort for each and adds a margin for uncertainty. The result is a range with stated assumptions, not a single precise figure.
- List the user roles and what each must be able to do.
- Split the work into features and rate each as small, medium or large, with an hours range.
- Add effort for design, testing, deployment and management as separate lines.
- Add integrations and data migration, which are the most underestimated items.
- Add a contingency based on how well defined the scope is.
- Convert hours to money using the team's blended rate and add third-party costs such as hosting and licences.
A worked example with stated assumptions
Consider an internal order and quoting tool for a distributor. These numbers are assumptions chosen for the example, not a quote or a market price. Assume a blended team rate of £75 an hour.
| Item | Hours | Cost at £75/hour |
|---|---|---|
| Discovery and requirements | 40 | £3,000 |
| Design (interface and data model) | 60 | £4,500 |
| Development: quotes, orders, customers, pricing rules | 240 | £18,000 |
| Integration with accounting system | 50 | £3,750 |
| Data migration | 30 | £2,250 |
| Testing and fixes | 90 | £6,750 |
| Deployment and handover | 30 | £2,250 |
| Project management (about 12%) | 65 | £4,875 |
| Subtotal | 605 | £45,375 |
| Contingency at 15% | 91 | £6,806 |
| Total | 696 | £52,181 |
On these assumptions the project costs roughly £52,000. Double the integration work and add a mobile app and the total rises sharply, while removing the migration and pricing rules lowers it. The point of the table is to show where the money goes and which assumptions to challenge in any proposal you receive.
Pricing models: fixed, time and materials, retainer
How a supplier charges affects who carries the risk.
- Fixed price: a set fee for a defined scope. Good when requirements are stable. Changes are priced separately, and suppliers add contingency to cover risk.
- Time and materials: you pay for hours worked, usually with a budget cap and regular reports. Flexible when scope will evolve, but it needs active management.
- Retainer or dedicated team: a monthly fee for a team's capacity. Suits continuing product development.
Many projects combine them: a fixed-price discovery phase, followed by phased delivery with a budget for each release. Phasing lets you stop or adjust after real use rather than commit everything upfront.
Costs after launch
The build is the first cost, not the last. Plan for hosting and infrastructure, backups and monitoring, security updates for the frameworks and libraries underneath, bug fixes, small improvements as the business changes, user support, and any licences for third-party components or services. A common planning habit is to reserve a yearly share of the build cost for upkeep and agree the figure in advance, but the right share depends on the system. Software that is not maintained becomes insecure and then expensive to rescue.
How to keep the cost under control
- Start with the smallest release that delivers value, then extend based on real use.
- Write down what is out of scope as well as what is in.
- Reuse standard components and existing products for commodity features.
- Involve the people who will use the system early to avoid rework.
- Agree how changes are estimated and approved.
- Own your code, data and documentation so a change of supplier does not mean starting again.
Before committing, compare the build with buying; our guide on custom software vs off-the-shelf shows the five-year view. If the process you want to build is mostly repetitive steps, look at business process automation first, as automation on top of existing systems can be much smaller than a new application.
How we work
We build custom software, enterprise applications, integrations and data platforms for companies in the UK, Türkiye and Europe. Our custom software service starts with discovery and a written scope, then delivers in phases so you see working software early. For companies who may not need to build at all, we built Dika Ops as an AI-native ERP; it is in closed beta and you can read about its HR module, for example.
Frequently asked questions
How much does custom software cost?
It depends on scope, integrations, security needs and team rates, so no honest single figure exists. Build an estimate from features and hours, as in the example above, and ask suppliers to state their assumptions.
Why are quotes for the same idea so different?
Suppliers may assume different scope, quality levels, team seniority or contingency. Compare the assumptions line by line, not just the totals.
Is fixed price or time and materials better?
Fixed price suits well-defined work and gives budget certainty. Time and materials suits evolving work. A phased approach with a fixed-price discovery and a capped budget per phase often balances both.
How much does maintenance cost?
Maintenance covers hosting, security updates, fixes and support. The amount depends on system size and how fast your needs change. Agree a yearly maintenance budget at the start rather than discovering it later.
How can I reduce the cost of custom software?
Reduce scope to the first valuable release, reuse standard components, clean your data before migration and give clear, tested requirements. Changing requirements mid-build is the most common cause of overruns.
How long does custom software development take?
A focused tool can reach a first release in a matter of weeks, while larger systems take months. Time and cost are linked, because both follow the team's effort.
Do I own the software after it is built?
Ownership depends on your contract. Agree in writing who owns the code, the data and the documentation, and how third-party components are licensed.
Next step
Write your top ten features, mark the three that deliver most of the value, and list every system the software must connect to. With that page you can get comparable estimates, and our team can review them with you.
