How Much Does Custom Software Cost?

Published May 2026 · Updated July 15, 2026 · By Mark Overstreet, Founder & Lead Consultant at Ignyte Software

What Actually Drives Cost

• Scope clarity, above everything. Unclear requirements are the single biggest cost multiplier in the industry data; McKinsey’s long-running benchmark found large IT projects run 45% over budget on average, and cost control starts before the first sprint
• Integrations. Each system the software must talk to (ERP, CRM, third-party APIs) adds real engineering work, especially systems without modern APIs
• Data migration. Moving and verifying years of existing data is often a project inside the project
• Users and security. Internal tool for 10 people vs. public-facing application with compliance requirements are different budgets

Fixed-Bid vs. Time & Materials

Fixed-price contracts buy budget certainty, and vendors price that certainty in: industry guides consistently report a 15-30% risk premium built into fixed quotes to cover scope unknowns. Time-and-materials removes the premium but requires active scope management. We offer both, and for larger or evolving projects we often recommend the hybrid many firms use: a small fixed-price discovery phase to nail the scope, then build with clear milestones. Either way, you get the estimate before code is written.

The Costs People Forget

Software isn’t done at launch. Plan on roughly 15-25% of the original build cost annually for maintenance, updates, security patches, and hosting, an industry rule of thumb that matches our experience. A vendor who doesn’t mention this is leaving it for you to discover later.

The Honest Answer

Ask any vendor for a number before discovery and you’ll get a guess with a buffer in it. Our process: a free conversation, a scoped discovery, then a real estimate you can hold us to. If off-the-shelf software genuinely fits your need, we’ll say so.