Custom software guide /
When a business needs something built, and when buying is the better answer.
We look at the process you would be replacing and what already exists, and send you back whether a build is worth it.
By Reece Rainer
spareday, Newcastle NSW
Last updated
31 August 2026
Read time
7 minutes

Custom software is a tool built for one business rather than bought off a shelf. A jobs system, a client portal, a quoting tool, or something nobody has made because only you need it.
It is the largest thing on this site and the one most often started for the wrong reason. What follows is when a build is genuinely the answer, what it actually involves, and when buying something existing is the better decision.
A tool built around how one business already works, rather than a business changing how it works to fit a product. It is the same difference as a made-to-measure suit.

Most businesses run on a stack of products that each do part of the job, with a spreadsheet bridging the gaps. That works, and it keeps working until the spreadsheet is the business.
Anything built to hold customer details has to sit inside the Australian Privacy Principles.
When the way you work is genuinely different from everybody else and that difference is why customers use you. If the difference is just habit, a product will do it cheaper.

This is the question worth being honest about, because a build is the most expensive answer available and it is often the second best one.
Signs it is not: nobody has looked at what exists, the process it would encode has never been written down, or the reason is that the current product is irritating rather than wrong.
Nearly always, if something exists that does eighty per cent of it. A product has years of other people's problems already solved in it, and that is worth more than the last twenty per cent.
A product you buy has been used by thousands of businesses, which means the edge cases you have not thought of have already happened to somebody else and been fixed.
Custom software starts with none of that. Everything it has to handle has to be thought of, and the ones nobody thought of turn up later as faults.
The honest sequence is: look at what exists, look at what you already pay for, and only build the part that genuinely has no answer. On most of the projects we are asked about, that part is much smaller than the original idea.
The middle option gets forgotten. Connecting two products you already own so they stop needing a person between them is a small build with most of the benefit.
The code, the data, and the accounts it runs in. Software you cannot take to another developer is rented, whatever the invoice called it.
This matters more here than anywhere else on the site, because software keeps needing work and the person who holds it holds the relationship.
Ours is set up that way from the first day, because retrofitting it is awkward and asking for it later is a conversation nobody enjoys.
Write down the process, look at what already exists, build the smallest useful version, put it in front of real work, then add only what the real work asked for.

As it actually happens, with the people who do it. If three people do it three ways, that is the first finding and it is a business decision rather than a software one.
Properly, including the features of the tools you already pay for. This step regularly ends the project, which is a good outcome.
The part that carries the most weight, on its own. Not the whole idea, and not a prototype nobody can use.
With real jobs and real people, early. Everything you learn here changes what gets built next.
Not the list from the first meeting. Half of that list turns out to be unnecessary once the first version is being used.
Software is not finished, it is in service. Whoever holds it needs to be reachable, and that is an ongoing arrangement rather than a project cost.
Longer than a website and shorter than the first estimate, if the smallest useful version goes first. Projects that go badly are nearly always ones that tried to ship everything at once.
The projects that fail are not usually the technically hard ones. They are the ones where nobody wrote the process down and everybody agreed to build everything.
Ask whether they think you should build this at all, who holds the code, what a change costs afterwards, and what happens if they stop working. The first answer tells you the most.

We do this work in Newcastle, so we are not neutral. These are the questions we would want asked of us.
A business whose process has never been written down is not ready for this conversation, and writing it down is the useful next step whether anything gets built or not.
If you do one thing before commissioning software, write down the process it would replace, as it actually happens. Half the projects we are asked about end at that step, and ending there is much cheaper than ending later.
Related reading from us: marketing for a Newcastle business and business process automation.
When the way you work is genuinely different and that difference is why customers use you. If it is habit rather than difference, a product will do it cheaper.
Nearly always, if something exists that does most of it. A product has years of other people's problems already solved in it.
Connecting two tools you already pay for so a person stops typing the same data into both.
The business, in an account in its own name, with a copy you can hand to another developer without asking permission.
Usually because nobody wrote the process down, or because everything was built at once instead of the smallest useful version first.
One monthly fee that covers everything, month to month, with no lock-in contract. The number depends on what your business needs, so we give it to you on the call.
I now have a custom dashboard that lets me track exactly what my competitors are doing, spot viral content trends in real time, and script high-performing content ideas on demand. The difference has been night and day. I’m no longer guessing.
He didn’t just build me a great website, he created an easy-to-manage system that allows me to make updates myself whenever I need to. He has spared me so much time doing all of this myself!
Reece has a strong understanding of AI agents and automation, and was happy to share how he uses it in his business and how to apply it within mine.