Software Documentation Checklist: 8 Documents to Get Before Handover

A good software documentation checklist for handover is short: eight documents that let a new developer run, change and deploy your system without calling the person who built it. You don't need a 100-page manual. You need a README, an architecture overview, a decision log, a runbook, an accounts register, an integrations map, an admin guide and an honest list of known issues.

Full disclosure: I take over and maintain systems other developers built. Treat this as the list I'd tell you to demand from any developer, me included.

The short answer: 8 documents and what each one prevents

Documentation isn't a final phase. It should grow through every stage of the software development process, or it never gets written. My rule of thumb: a task isn't done until the docs it touches are updated.

For the next developer: README, architecture and decisions

You don't need to read these line by line. You do need to confirm they exist and match the code running today.

The decision log is usually the one that's missing. Without it, the next developer guesses. A requirements specification from the start of the project helps, but it describes what was supposed to be built. Handover documentation describes what was actually built.

For keeping it running: runbook, accounts and integrations

These three matter when something breaks on a Friday afternoon, and on the day your developer moves on.

The accounts register decides whether switching developers is painless or expensive. I've covered the handover itself step by step in my guide to switching developers mid-project.

For your team and budget: admin guide and known issues

The last two are about how often you have to call a developer, and how many surprises are waiting.

Developers rarely enjoy writing item 8 because it exposes weak spots. That's why you want it: technical debt gets more expensive the longer it stays hidden, and a written list turns it into something you can plan and budget for.

How to test the docs without reading code

You can judge the docs without being technical. Three checks cover most of it:

1. Check where they live. Are the docs plain text files (usually Markdown) in your repository, or in your developer's own tools? Only the first stays with you when the contract ends.
2. Check the dates. If the README hasn't changed in two years and the code changed last week, it's probably wrong.
3. Run a stranger test. Pay another developer for a few hours to set up the project and make a small change using only the docs. Wherever they get stuck, documentation is missing.

Written docs matter even more with a remote contractor in another time zone, because they replace the quick question across the desk. The stranger test also fits into a broader review of the signs of a healthy codebase.

When you don't need all eight

A small marketing site or a prototype you're still testing doesn't need a decision log or an admin guide. A README and an accounts register are enough. Add the rest once the system becomes business-critical.

Don't pay for a long Word document written in the last week of a project, either. It goes stale with the first change. Short docs next to the code beat a long one in a shared drive.

If you're happy with your current developer, don't switch just to get documentation. Send them this list and ask for the missing pieces as part of the regular work. It's usually a matter of hours or a few days, not a new project.

Next steps

1. Go through the table and mark which of the eight documents you can find today.
2. Start with the accounts register. You can draft most of it yourself from invoices.
3. Ask your developer for the rest in order of risk, and make documentation part of every task from now on.

If nobody maintains your system today, or the documentation left with a previous developer, see how I handle maintenance and ongoing development. You own the code from day one, and you work directly with the developer who writes it.

Frequently asked questions

Who should pay for software documentation?+

You do, but it should be part of the original price, not an extra invoice at the end. Documentation written as the work happens is quick because the details are fresh. Having a new developer reconstruct it later usually takes far longer, and you still pay for it.

Should documentation be written into the contract?+

Yes. List the documents as deliverables, for example the eight in this checklist, and state that they're kept up to date and handed over with the code. Without that, they're hard to demand later. Contract law differs between countries, so this isn't legal advice: have a lawyer review the agreement if a lot is at stake.

Isn't clean code self-documenting?+

Only partly. Readable code and automated tests show what the system does. But code can't tell you why a choice was made, which accounts exist, who pays for hosting or how to restore a backup. That has to be written down somewhere you and the next developer can find it.

Can documentation live in Notion or Confluence instead?+

For some of it, yes. The admin guide and accounts register often work well in a shared workspace your team already uses. Developer docs such as the README, architecture notes and decision log belong in the repository, so they change together with the code. Whatever tool you pick, make sure the workspace is owned by your company.