Landlord Gas Safety Certificates on your phone.

Certii fills in CP12-style Landlord Gas Safety Records in about 55 seconds — built by a working UK Gas Safe engineer who got sick of pads, ink and filing.

£24.95/month or £199.95/year · unlimited certificates & engineers · cancel anytime

Everything a CP12 needs, nothing you don't

• Full landlord record format — inspection address, landlord/agent details, appliance locations and types, pipework checks, defects and rectification work, CO and smoke alarm checks.
• Automatic pressure calculations — enter the regulator operating pressure once and each appliance's operating pressure is worked out for you, with automatic Pass/Fail for natural gas and LPG ranges.
• Appliance library — save the boilers, fires and hobs you see every week; make and model auto-fill the flue type and analyser readings.
• One-page A4 PDF — a print-ready landlord gas safety record generated in one tap, with your Gas Safe registration and signature on it.
• Works offline — no signal in the property? Certificates queue up and save to your Google Drive automatically when you're back online.
• Your records, your Drive — every certificate files itself into your own Google Drive by year and landlord. Nothing is stored on our servers.

How it works

1. Set up once. Enter your Gas Safe registration, company details and engineers — they pre-fill every certificate from then on.

2. Fill in on site. Pick "Landlord Gas Safety Record", enter the property and appliance details, and the checks. Most fields default sensibly or auto-fill.

3. Finish. One tap generates the A4 PDF, saves it to your Google Drive, and lets you share it with the landlord or agent instantly — or print a copy on site.

Common questions