Solving Complex Challenges Through Custom Development
Custom software earns its cost in a narrow set of cases, and off-the-shelf wins the rest. That is an unusual thing for a development company to lead with, so here is the reasoning, the published evidence on how custom projects go wrong, and an honest note on why most of that evidence does not describe projects the size of yours.
Key takeaways
- Large IT projects average a 45% cost overrun and a 56% shortfall against predicted value, on research covering more than 5,400 projects.
- Those were projects with budgets above $15 million. Most Indian SME projects are two orders of magnitude smaller, so the headline figures do not transfer.
- The finding that does transfer: every additional year of planned duration adds about 15% to the cost overrun. Short scopes are safer scopes.
- Off-the-shelf is the cheaper answer more often than a development company usually admits. A build is for rules a product will not model.
When does custom beat off-the-shelf?
Three conditions, and you need at least one. Your rules — pricing, approvals, tariffs, certifications — are ones no product models, and changing your process to fit is worse than building. You are consolidating several entities or sites onto one set of records. Or an existing system has to stay, and whatever you buy has to work around it.
If none of those applies, a product deploys in days rather than weeks, costs a fraction to start, and somebody else maintains it. We will tell you that before quoting a build. Our custom versus off-the-shelf comparison works through the decision in detail, and the custom software development cost guide has the numbers.
What does the evidence on failed projects actually say?
The most-cited research is a study by McKinsey with the BT Centre for Major Programme Management at the University of Oxford, covering more than 5,400 IT projects. It found an average 45% cost overrun, a 7% schedule overrun and 56% less value delivered than predicted. Around 17% went so badly that McKinsey described them as able to threaten the existence of the company, with overruns of 200% to 400% (McKinsey). Companion academic work by Flyvbjerg and Budzier put roughly one project in six in that category (Oxford).
Now the caveat that most people quoting those numbers leave out. “Large” in that study meant an initial budget above $15 million in 2010 dollars. A project at ₹5 lakh to ₹40 lakh is roughly $6,000 to $50,000 — hundreds of times smaller. Quoting a 45% overrun figure at that scale is borrowing authority from research about something else.
What transfers, and what does not
| Finding | Does it transfer to a small project? |
|---|---|
| 45% average cost overrun | No — measured on budgets above $15m |
| 17% threaten the company | No — a ₹20 lakh project cannot |
| Each extra planned year adds ~15% overrun | Yes — duration is the risk, at any size |
| 56% value shortfall against prediction | Partly — optimistic business cases scale down fine |
The transferable lesson is about time, not money. If duration drives overruns, the defence is a scope you can finish — which is why we quote a fixed price for a defined scope and keep most projects to six to eight weeks, or three to five months where several modules are involved.
How do you keep a custom project from going that way?
Four things, none of them technical. Define a scope that can actually be finished, and ship it before scoping the next one. Count the integrations early, because the number of existing systems involved predicts the timeline better than the feature list does. Insist the business case states what would make the project not worth doing. And check the maintenance cost before signing, not after.
What we have seen at DECK IT
We build custom software from Ahmedabad for companies in India and the United States, using AI-assisted development so engineers spend their time on the product rather than on boilerplate. Most projects we quote fall between ₹5 lakh and ₹40 lakh, roughly $6,000 to $50,000, as a fixed price for a defined scope.
Two patterns recur. The project that overruns is almost always the one whose scope grew after it started, not the one that was estimated badly at the outset. And the expensive gap is between systems rather than inside one: two tools that each work, with no scheduled comparison between them, and a reconciliation nobody owns.
You own the intellectual property on everything we build for you.
Frequently asked questions
Is custom software more expensive than off-the-shelf?
Upfront, almost always. Over time it depends on the subscription you avoid and the process changes you do not have to make. Most projects we quote fall between ₹5 lakh and ₹40 lakh as a fixed price for a defined scope; a product is the cheaper answer unless your rules genuinely do not fit one.
Do 45% of software projects really run over budget?
The 45% figure is an average cost overrun from research on more than 5,400 IT projects with budgets above $15 million. It is a real finding about large programmes, and it does not describe a project costing tens of thousands of dollars. Treat anyone quoting it at small scale with caution.
How long should a custom project take?
A small web or mobile app usually takes six to eight weeks; a larger business system with several modules, three to five months. Longer planned durations are themselves a risk factor, so a scope you can finish beats a scope that is complete on paper.
What drives the price most?
The number of existing systems the software has to integrate with, ahead of the feature count or the number of users. List them in your first message and the estimate will be far more useful.
Who owns the code?
You do. On software we build for a client, the client owns the intellectual property.
Conclusion
Ask a development company when you should not build. If the answer is never, the advice is sales. Custom software is the right call for rules a product will not model, for consolidation, and for working around systems that have to stay — and the way to keep it safe is to keep it short.
If you would like an honest read on which side of that line you are on, tell us what you are trying to build.