Sound familiar?
The paperwork side of gas work takes longer than it should.
Paperwork after the job
Writing up forms at the kitchen table after a full day on site. Then scanning, emailing, and hoping the landlord can read your writing.
Chasing signatures
Landlords who are never on site. Letting agents who want the certificate before they pay. Getting a signature takes longer than the job.
No signal on site
Basements, plant rooms, rural properties. Half the jobs you attend have poor or no mobile data at a critical moment.
Certificate on a phone
A blurry photo of a handwritten form sent via WhatsApp is not a certificate. Landlords and agents increasingly want something professional.
How it works
Open CertBox on your phone
No app download needed. Add it to your home screen for an app-like experience. Sign up in under a minute.
Fill in the form on site
Step-by-step form covers all required fields. Works offline. Captures signature on screen. Done before you leave.
Send the link instantly
Share a secure certificate link or PDF with the landlord or letting agent before you drive away.
Built for gas engineers
Every feature designed around how gas engineers actually work.
CP12s in minutes
Fill in a gas safety record on your phone between jobs. Use "Create Similar" to copy address and appliance details for repeat landlord work.
166+ certificate types
Gas safety records, service records, commissioning sheets, warning notices, and more. Everything a gas engineer needs in one place.
Instant sharing
Send a certificate link to the landlord or letting agent before you leave site. No scanning, no posting, no WhatsApp photos.
Offline capable
Start a certificate in a basement with no signal. It syncs automatically when you reconnect. Nothing gets lost.
Gas Safe compliance built in
All gas certificate templates include the required Gas Safe fields and follow industry-standard formats used across the UK. Mandatory fields are enforced before submission so nothing gets missed.
Gas certificates available
The certificates gas engineers need most, plus 160 more types for any job.