Cost of Rewriting Legacy Software to Web: Price Factors
The cost of rewriting legacy software is not a fixed number; it depends on the software’s complexity, the volume of data, the number of users and the features required — but it is almost always less than building a brand-new application from scratch, because the business logic already exists. This guide explains the price factors, cost models and how to budget correctly.
Which factors affect the cost of a rewrite?
- Business-logic complexity: the number of forms, reports and calculation rules in the old software.
- Data volume and condition: the more and messier the data, the longer migration takes.
- Users and concurrency: a system for 5 users differs from one for 50+ concurrent users.
- Integrations: connecting to payment gateways, SMS, accounting or e-invoicing systems.
- Design and UX: using a ready template versus a bespoke design.
Pricing models for a rewrite project
Three common models exist: fixed project price (good for a well-defined scope), time and materials (pay per hour, good for evolving projects) and phased (pay per delivered phase, which reduces risk). For most organizations the phased model is the safest.
Why is a rewrite cheaper than building new software?
In a rewrite, the workflows, rules and required reports are already defined in your current software; instead of analyzing from zero, the development team moves that same logic onto a modern platform. This shortens analysis and testing and lowers the cost.
How to keep the rewrite budget under control
- Prioritize features: the essential core is built and launched first (an MVP).
- Phased delivery: each phase is usable and feedback is gathered before the next.
- A free upfront estimate: get a transparent cost and timeline before starting.
Free rewrite estimate
In our legacy-software rewrite and web-migration service, the cost and timeline estimate is completely free; just send us your current software’s flowchart or description. Related guides: Rewriting Legacy Software: When, How & Cost and Safe data migration when rewriting.
FAQ
How is the cost of a software rewrite estimated?
Based on the number of forms and reports, data volume, user count and required integrations; after reviewing your current software, a transparent estimate is provided.
Is a rewrite more expensive than building new software?
No; it is usually cheaper because the business logic already exists and the upfront analysis is shorter.
Can the cost be paid in phases?
Yes; in the phased model you pay per delivered phase, which reduces risk and financial pressure.
How long does the initial estimate take?
Usually, after we receive a description or flowchart of your current software, a free estimate is ready within a few business days.
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