Gas Certs lets you fill in a CP12 (the Landlord Gas Safety Record), a Boiler Service Record or a Gas Warning Notice on your phone, approve it, and send it straight to the landlord or client as a PDF. No paper pads, no typing it up later at the kitchen table.
Before you start
You need two things on record, both one-off:
- Your business Gas Safe registration number under Settings.
- The engineer's Gas Safe licence number and its expiry date, taken from their Gas Safe ID card, on their team profile.
Mucka asks for these the first time you open a draft if they're missing, and you can't approve a certificate until they're filled in. They're a legal requirement on the record, not a Mucka rule.
A Gas Safe ID card is renewed every year and the number changes with it, so Mucka also won't let you approve a certificate under a licence that's out of date. When the card is renewed, update the number and expiry on the engineer's team profile and you're good to go again.
Start the certificate
You can start one three ways:
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From the job, in one tap. Open the job from Jobs. If the job type is certificate work, the Gas Certificates card says so at the top: "This job needs a Landlord Gas Safety Record (CP12)", with a Start it button. Tap it and you're in the draft, with the client, property and engineer already filled in. Nothing to pick, nothing to re-key.
If the job was booked without a property on it, the Property box on the certificate lets you search for one — or add it there and then if it's a house you've never been to before. Engineers can do both, so nobody has to ring the office to get an address onto a certificate.
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From the Certificates due list. Go to Gas Certs. Any job that still owes a certificate is listed at the top, jobs you've already done but not certified first. Tap one to go straight into its draft.
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From scratch. On Gas Certs, tap New certificate and pick the type yourself. This is the one to use for a second certificate on the same job, or when the job type doesn't match what you're actually writing.
Telling Mucka which jobs need a certificate
The prompt and the Certificates due list both work off your job types. Each job type can say which certificate it produces, so a job booked as "CP12 Cert." knows it needs a CP12 and a "Boiler Service" knows it needs a Boiler Service Record.
The usual gas job types are set up for you. To check or change them, head to Settings → Work → Job types. Edit any job type and pick the certificate it produces. Set it to No certificate for anything that doesn't produce one, like a powerflush or a leak fix.
If a job type has no certificate set against it, nothing is wrong: Mucka just won't prompt you for that kind of job, and you can still start a certificate from scratch whenever you like.
Fill it in
Work down the form on site:
- Appliances. Add each appliance with its location, make and model, then record the checks. Pass, fail or not applicable, with a note and a photo where it helps.
- Readings. Operating pressure and combustion readings have the unit locked in, so a number can never be read as the wrong unit. Combustion is CO and CO2 at high (max) rate, with low (min) rate behind an optional toggle. Take both and both print on the record, shown as high / low. Leave the low rate off and the record shows a dash for it, so nobody reading the cert has to guess whether it was taken.
- Gas supply and pipework. The tightness test and the rest of the supply checks. On a Boiler Service Record or a Service & Maintenance Record there are two extra boxes here, the standing pressure and the working pressure, both locked to mbar. Both are optional, neither holds up approving the record, and only the ones you fill in print on the certificate. Nothing is flagged as high or low: natural gas and LPG sit at very different pressures and the record does not ask which fuel it is, so the reading is yours to judge.
- Certificate result. Mucka suggests pass or fail from the checks you've recorded, but the call is yours — a failed check can be a minor. There's also a small N/A button beside Fail for the records that genuinely carry no overall verdict. Tap it and no result is printed on the certificate at all.
- Next check due. Mucka suggests twelve months ahead. Change it if you need to.
- Sign it off. The engineer signs on screen. The customer can sign too, but they don't have to (a landlord record is often issued with nobody on site). Tap the signature box and the signing pad opens full screen, so there's proper room to sign. Handy for anyone with an unsteady hand. Write the name in whenever suits you — before you hand the phone over or after they've signed, either way round. The Signed by box stays open until the certificate is approved.
Everything saves as you go, so you can put your phone down mid job and pick up where you left off, even on a different device.
Approve and send
Tap Approve when it's done. Mucka shows you the outcome (pass, pass with defects, or fail — or nothing at all if you set the result to N/A) and asks you to confirm. Approving locks the certificate as a legal record and generates the PDF. After that it can't be edited, only corrected (see below).
Then tap Send. Mucka pre-fills the landlord or agent from the property and attaches the PDF. On a CP12 you can tick to send the tenant a copy too. Check the message, then send.
Need to fix an approved cert?
You can't edit a locked certificate, but you can create a correction. That copies it into a fresh draft with a new serial number; once you approve the correction, the original is marked superseded and its PDF carries a "superseded" watermark. The original is never deleted, so your trail stays intact.
Renewal reminders
When an approved certificate gets within about four weeks of its next-due date, Mucka raises a renewal card in your Action Required area: "the CP12 at 14 Acacia Avenue is due on 3 July, book them back in?". Tap to approve and Mucka sends the client a friendly re-booking reminder (you can edit the message first, and nothing goes out until you approve it). It's the easy way to keep the recurring work coming back.
You can also ask Mucka any time:
"Which gas certificates are due for renewal soon?"
Ask Mucka
You can ask Mucka to get one started for you:
"Start a CP12 for the boiler service at 14 Acacia Avenue."
Mucka opens the draft and links it up, but it never approves or sends a certificate on its own. Filling in the checks, approving and sending are always your call.