Custom software for small business, sized to the team you actually have

Software should match the number of people who use it. What a firm of forty needs is dead weight for a sole trader: more screens, more subscriptions, more admin to keep it all current. The table sets the four sizes side by side.

A small business does not need an ERP. An ERP solves problems that appear when ten people work on stock, purchasing and accounts at the same time. Until you have those problems, it adds cost and training without paying back. If you are still weighing the two, CRM vs ERP explains the difference.

If you work alone, almost everything you need already exists as a package. Since 6 April 2026, sole traders and landlords registered for Self Assessment with qualifying income over £50,000 in the 2024 to 2025 tax year must use Making Tax Digital for Income Tax. The threshold drops to £30,000 from 6 April 2027 and to £20,000 from 6 April 2028. That means keeping digital records and sending quarterly updates from compatible software, which pushes most sole traders onto a proper accounting package anyway.

Beyond the books, your software is a calendar clients can book into, a list of customers, and a website that brings in enquiries. Which CRM fits one person is covered in CRM for sole traders, and how AI can draft replies and quotes for you in AI for sole traders. What a freelancer's site needs to do is on web design for freelancers.

In most small firms the strain shows first in the schedule. A spreadsheet with names down the side and days across the top works while one person keeps it. Once three people edit it, nobody knows which copy is right, who is off sick or which crew is booked twice.

A scheduling package solves a lot of this: holidays, availability, an app for people on the road. If your planning fits their model, buy one. How to weigh that up is in spreadsheet or scheduling software, and what such a tool does for crews in staff scheduling software. Your own scheduling software only wins when the plan depends on things a package does not track, such as certificates per engineer or machines that can only be on one site at a time.

Before building anything new, check what your packages can share. We build integrations on each vendor's public API, with your key or app registration. We are not an official partner of these vendors, and you do not need one to use their API. Per package:

• Odoo integration for firms that run on Odoo;
• Exact Online integration, often chosen by the accountant;
• Teamleader integration for CRM, quotes and projects;
• Robaws API for construction and installation firms;
• Business Central integration for firms already in the Microsoft world.

If your package is not listed, API integration services explains how we approach it. When a file needs its own fields and stages, a custom CRM or a custom ERP pulls the data together from what you already use.

Take a technical service firm with 25 staff, 15 of them engineers in the field. Assumptions: a planner spends eight hours a week on the spreadsheet rota and chasing engineers; each engineer loses ten minutes a day on paper job sheets that the office retypes; the office spends four hours a week copying amounts from job sheets into invoices.

That is about 18.5 hours a week, or around 850 hours over 46 working weeks. Set that against the build cost and the upkeep. In this example accounts and payroll stay in their packages: only the planning board and job sheets become custom software, connected to the accounting package. What a build like that costs is broken down in custom software development cost, and when buying still wins in build vs buy software.

Two changes make clean data more valuable for UK small businesses. Making Tax Digital for Income Tax widens each April until 2028, so more sole traders and landlords move to digital records. And the government has confirmed mandatory e-invoicing for all VAT invoices from 2029, with a roadmap promised at Budget 2026. What is known so far is in e-invoicing in the UK.

For custom software this matters in one practical way: anything that creates invoices or financial records should hand them to your accounting package through an integration, not through retyping. Then each new rule lands in one place, the package, and your own tool keeps working.

If your clients are large companies, they may ask for more than your packages offer: a data processing agreement, two-factor authentication, an audit log you can export. What to expect is on working with larger companies. Keeping a small platform safe starts with two-factor authentication and a clear owner for every account.

Not every problem a small firm has is a software problem. Finding customers and finding staff both start with a website: a clear page per service, real photos of your work, and an enquiry or application form that takes a minute on a phone. What that site needs is on small business website. We design websites from 1,500 euros, with a fixed price agreed after a conversation.

When clients need to follow their own job, approve a quote or download documents, the step after the website is a client portal. For anything bigger that runs in the browser, see web application development or our approach to custom software, and for how we run a build for a UK firm from Belgium, bespoke software development in the UK.