Custom Software

How Much Does Custom System Development Cost? One Formula to Estimate Your Budget Tier

By 翁睿承|September 17, 2026|5 min read

How much does custom system development cost? There's no single number, but Taiwan's small-to-mid projects mostly fall between NT$300,000 and NT$2,000,000. That range isn't vendors pricing randomly — a handful of variables behind the quote determine the final figure, and you can estimate a budget tier yourself with one formula before a quote ever lands in your inbox.

Why Can Two Quotes for the Same Request Differ by Two or Three Times?

Quote gaps usually don't come from "who's more expensive" — they come from differences in scope:

VariableEffect on the quote
Number of feature modules and permission tiersMore screens and logic means work hours scale up linearly
Whether it integrates with existing systems (ERP, payments, IoT)Most easily underestimated — testing and debugging costs run high
Expected scale of use (concurrent users, data volume)Affects architecture decisions, which drives upfront investment
Whether the quote includes post-launch maintenanceIf it doesn't, that cost will surface later

Before comparing two quotes' totals, confirm the four items above are apples-to-apples — otherwise, no matter how close the numbers look, the comparison is meaningless.

Stacked bar chart of the four cost components in custom system development

A Simple Formula to Estimate Your Own Budget Tier

You don't need to wait for a vendor's quote to get a budget tier in mind: Estimated budget = number of core feature modules × average hours per module × team hourly rate, plus a 10-30% buffer. For example, a project with 5 core modules, roughly 60 hours per module, and an hourly rate around NT$1,000 lands in the ballpark of NT$1,000,000 — enough to walk into a vendor conversation mentally prepared, instead of seeing a number for the first time right before signing.

A 50-Person Company's Decision (Illustrative Scenario)

Imagine a 50-person trading company that originally just wanted the lowest-quoted team to build a quotation system. They later discovered maintenance costs weren't included in the quote, and the add-on fees six months after launch ended up exceeding what they thought they'd saved. After re-comparing quotes using the module breakdown above, they realized the real comparison point was "scope covered," not "total number" — and ultimately chose the team with a slightly higher quote but the clearest scope. This scenario comes up repeatedly in our discovery interviews; only the company size and system name change.

Where Does Noise & Signal Sit in This Pricing Spectrum?

Noise & Signal (諾訊科技) is a Taipei-based custom software and AI agent development company. Typical SME project quotes range from NT$300,000 to NT$2,000,000; an MVP usually launches in 6-12 weeks, and a full system in roughly 3-6 months. We quote in phases after a requirements interview, with maintenance billed separately. If your project has already reached the scale of needing multi-country teams delivering in sync, this tier isn't the right starting point — you'll want a vendor with large-scale global delivery experience instead.

FAQ

What's the fee most often left out of a quote?+

Post-launch maintenance is the most commonly omitted line item — always ask directly whether it's included in the total price.

How much buffer should I add to my budget?+

A common rule of thumb is 10-30% on top of your estimate, to absorb scope adjustments once requirements are clarified.

How much longer does a full system take compared to an MVP?+

An MVP typically launches in 6-12 weeks; a full-featured system usually takes 3-6 months.

Can I just pick the vendor with the lowest quote?+

We don't recommend comparing on total price alone — confirm first whether the scope covers testing and maintenance, or you risk add-on charges after launch.

When does it make sense to start with a small pilot?+

When requirements are still unclear, or you want to validate a single process first, a small pilot is a good way to start before expanding the engagement.

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