Paper vs app: an honest look at going digital for CP12s
By Jordan Valentine-Dunn, Gas Safe registered engineer · 9 July 2026
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.