For engineers

Paper vs app: an honest look at going digital for CP12s

By Jordan Valentine-Dunn, Gas Safe registered engineer · 9 July 2026

A phone showing a digital CP12 gas safety certificate with a brass tick, representing paper versus app records

A digital CP12 is just as legally valid as a paper one. Gas Safe Register accepts electronic records; what makes a Landlord Gas Safety Record valid is the in-person check and the engineer's registration, not the medium. So paper vs app is really a time question: does going digital save you enough admin to be worth the change?

Is a digital gas safety certificate legally valid?

Yes, and it is worth settling this first, because it is the worry that stops most engineers. The Landlord Gas Safety Record can be produced, stored and sent electronically, and a PDF emailed to a landlord counts exactly as much as a carbon-copy pad. Keep the record for the required two years, make sure the tenant gets their copy, and the format is entirely your choice. Nobody is going to query a record because it was typed on a phone instead of written on a pad.

What does going digital actually change?

The gains are all about time rather than compliance.

  • You write the record once, on site, instead of scribbling on a pad and typing it up at home that evening.
  • Delivery is instant: the landlord and tenant get their copy by secure link or PDF before you've left the drive, so the 28-day duty is handled on the spot.
  • Last year's job is there when you walk back in: the appliances, the photos and the previous record, instead of a hunt through a filing cabinet.
  • Renewals can chase themselves, because the next-due date is recorded rather than remembered.

Add those up across a landlord-heavy week and the difference is real. The check takes the same time either way; it is everything around the check that shrinks.

What doesn't an app change?

The check itself. You do the same work to the same standard whether the record ends up on paper or a screen; the app only handles the writing-up, the filing and the chasing. And no app makes you compliant on its own. A valid record can only come from a Gas Safe registered engineer doing an in-person check, so anyone selling automatic certificates is selling something you should not buy. Be suspicious of any tool that blurs that line.

When is paper still the right choice?

If you do a handful of landlord records a year, a pad is fine, and switching would be change for its own sake. The carbon pad has real virtues: it never runs out of battery, it needs no setup, and the habit is already in your hands. Going digital earns its keep with volume. The honest test is whether the admin around the records has started to cost you real time or real work, and not before. Some signs it has:

  • You spend evenings typing up records you already wrote once on site.
  • Landlords and agents ring to ask for copies of certificates you have already sent.
  • A renewal slipped this year because the due date lived in a diary or a memory.
  • You walk into a repeat job with no record of what you found last time.

How do you choose a gas certificate app?

Judge it against the job, not the feature list. Ask whether it works with no signal, because the cupboards and lofts where gas work happens rarely have bars. Ask how the landlord and tenant actually get their copies, and whether renewal dates are tracked without you doing anything. Then try it on a real CP12 before you commit; ten minutes on a doorstep tells you more than any demo. We keep an honest comparison of the main options, linked below, and yes, we sell one of them.

Whatever you use, paper or app, the record is only valid when a Gas Safe registered engineer has done the check. This is general guidance, not legal advice and not a product pitch.

Frequently asked

Is a digital gas safety certificate legally valid?

Yes. Gas Safe Register accepts electronic records; a digital or PDF Landlord Gas Safety Record is as valid as a paper one. What makes it valid is the in-person check by a Gas Safe registered engineer, not the format the record is kept in.

What is the difference between a paper and a digital CP12?

Legally, nothing: the content and validity are identical. The difference is workflow. A digital CP12 is written once on site, delivered to the landlord and tenant instantly, and its next-due date is tracked; a paper one is typed up or copied, posted or scanned, and filed by hand.

Do I still need to keep paper copies of gas safety records?

No. Keep the record, in any format, for at least two years and give the tenant their copy. A stored PDF meets the record-keeping duty; nothing says the archive has to be a filing cabinet.

Can an app issue a CP12 on its own?

No. No software can produce a valid gas safety record without a Gas Safe registered engineer carrying out the check in person. An app speeds up the paperwork around the inspection; it does not replace the engineer or the inspection itself.

What is the best app for gas safety certificates?

The one that holds up on site. Judge any CP12 app on whether it works offline, how it delivers copies to landlords and tenants, and whether it tracks renewals for you, then test it on a real job. Our comparison of the main options is linked above.

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