If you search "how much does custom software cost," you'll usually find marketing pages from dev agencies that spend 2,000 words telling you "it depends."
They'll talk about "discovery phases," "synergy," and "enterprise scalability" before refusing to give you a number and asking you to schedule a 45-minute discovery call.
I hate that. It's an enormous waste of time. So let's talk real numbers.
The three tiers of internal tools
When you strip away the agency overhead—the account managers, the fancy offices, the mandatory "strategy workshops"—the cost of building an internal tool comes down to time and complexity.
Generally, custom internal tools fall into three distinct buckets.
Tier 1: The Spreadsheet Killer (£2,000 - £4,000)
This is a tool built to replace a Google Sheet that has grown out of control. It usually involves a single core workflow, basic user authentication, and a clean interface to view, edit, and export data.
Examples:
- A custom inventory tracker for a small warehouse.
- A leave-request approval system for a team of 20.
- A specific reporting dashboard pulling data from Stripe.
Timeline: 1 to 2 weeks.
A solo developer using modern utility-first tools (like Next.js and Supabase) can build this incredibly quickly. If an agency quotes you £15k for this, they are charging you for their overhead, not the code.
Tier 2: The Workflow Automator (£5,000 - £12,000)
These are tools that connect multiple systems together or involve more complex business logic. They usually require integrations with third-party APIs, complex permissions (Admins vs. Managers vs. Staff), and background processing.
Examples:
- A client portal where customers can log in, view their invoices, and upload specific documents safely.
- An automated order-routing system that reads incoming Shopify orders and dispatches them to different local suppliers via email.
Timeline: 3 to 6 weeks.
This is the sweet spot for custom software. It costs the equivalent of two months of a junior employee's salary, but it works flawlessly 24/7, never takes a holiday, and eliminates human error from the workflow.
Tier 3: Core Infrastructure (£15,000+)
This is software that runs your entire business. If it goes down, your company stops operating. It requires extensive planning, rigorous testing, and ongoing maintenance.
Examples:
- A custom ERP (Enterprise Resource Planning) system for a manufacturing plant.
- A HIPAA-compliant patient management system for a private clinic.
Timeline: 2 to 6 months.
If you need Tier 3 software, you actually do want an agency, or better yet, to hire an in-house engineering team. A solo freelancer is generally the wrong fit for mission-critical, enterprise-scale platforms.
“The biggest mistake companies make is paying Tier 3 agency prices for Tier 1 workflow tools.”
Where the hidden costs live
The upfront build cost is only half the story. You also have to factor in the running costs.
A modern, utility-first application built on serverless infrastructure costs almost nothing to run. For most small-to-medium businesses, hosting a custom internal tool on Vercel or Cloudflare, backed by a database like Supabase, will cost less than £25 a month.
The real hidden cost is maintenance.
If your tool is bloated with features you don't need, it will break. Dependencies will go out of date. UI elements will clash. That's why at Worqship, we strictly follow the utility-first philosophy. We build the exact features you need to solve the problem, and absolutely nothing else. Less code means fewer bugs, which means near-zero maintenance.
The ROI calculation
Should you spend £4,000 on a custom tool? It's a simple math equation.
If a messy Google Sheet takes up 4 hours of your team's time every week, and their time is worth £40/hour, that spreadsheet is costing your business £8,320 a year.
A £4,000 tool that eliminates those 4 hours pays for itself in six months. After that, it's pure profit.
Stop paying for generic SaaS tools that force you to adapt your business to their software. Get a tool built exactly for how you work, pay for it once, and own it forever.