Best Software for Gas Engineers UK 2026: CP12 Certificates, Boiler Records and Gas Safe Compliance
Written by Tom Ellis · Senior Trades Editor
Last updated: August 2026
Quick Answer
Best software for UK gas engineers 2026: Commusoft (£45-150/mo) for CP12 gas safety certificates, service records and automated boiler service reminders; Powered Now (£19-89/mo) for gas cert templates, quotes and invoices; Sleepless Tradesman (free + AI) for AI-generated quotes and job planning without a subscription; Tradify (£39-49/mo) for diary and invoicing. Gas Safe engineers need software that stores CP12 records digitally — HMRC and gas safety law requires them to be kept for at least two years.
Gas engineers are subject to more compliance documentation than almost any other trade. Every boiler service, gas appliance installation, and safety check must produce a Gas Safe certificate — the CP12 Landlord Gas Safety Record being the most common. These certificates need to be delivered to the customer and retained by the engineer for a minimum of two years. Losing them isn't just bad practice — it's a Gas Safe registration risk.
The right software for a gas engineer does three things that generic job management apps often miss: it stores or generates Gas Safe compliant certificates, tracks annual boiler service dates automatically, and links certificate records to customer history so you can prove compliance at any Gas Safe inspection. We tested the main options available to UK gas engineers in 2026.
Why Gas Engineers Have Unique Software Needs
Gas Safe compliance creates documentation requirements that most generic job management tools don't account for. Before comparing options, here is what sets gas engineer software apart:
- CP12 Landlord Gas Safety Records must be issued to the landlord (and tenant if occupied) within 28 days of the check, or before the new tenancy starts
- Records must be kept for 2 years — Gas Safe Register inspections can request your job records at any time, and digital records are faster to produce than paper
- Boiler service contract customersexpect annual reminders — manual diary management doesn't scale beyond around 20 contracts
- Quotes for gas appliance installation involve fixed materials (boiler cost, flue components, commissioning kit) that templates help standardise
- Gas Safe registration number must appear on every certificate — software that generates certs should include this automatically
Gas Engineer Software Compared
| Software | Price | CP12 / Gas Certs | Boiler Reminders | AI Quoting | Best For |
|---|---|---|---|---|---|
| Commusoft | £45–£150/mo | ✓ Built-in | ✓ Automated | No | Gas service businesses, landlord contracts |
| Powered Now | £19–£89/mo | ✓ Templates | Manual | No | Sole traders, gas cert generation |
| Sleepless Tradesman | Free / £29.99/mo | No built-in cert | Manual | Yes (AI-generated) | AI quoting + invoicing for sole traders |
| Tradify | £39–£49/mo | No | Manual | No | Diary, quotes, invoices |
| ServiceM8 | From £9/job | No | No | No | Emergency reactive work |
App-by-App Breakdown
1. Commusoft — Best for Gas Service Businesses with Landlord Contracts
Commusoft is the market leader for UK gas engineers running boiler service contracts. CP12 and gas safety certificates can be completed digitally on site from an iOS or Android app, then automatically emailed to landlords and tenants. Automated service reminders are sent by email or SMS when a boiler's annual service date is approaching — turning passive customers into repeat bookings without manual follow-up. Pricing starts at £45/month for one engineer, rising to £150/month for larger teams.
The certificate and reminder features alone justify the cost for any gas engineer with more than 20 annual service contracts. For landlords and letting agents who need gas safety records issued reliably and on time, Commusoft's automated delivery is difficult to replicate with any cheaper tool.
2. Powered Now — Best for Sole Traders Who Need Compliant Gas Certs at Lower Cost
Powered Now is built specifically for trade compliance and includes gas safety certificate templates that can be filled in on site and emailed as a PDF. Not a full CP12 digital record system like Commusoft, but the templates are Gas Safe compliant and work for sole trader gas engineers who don't need a full service management platform. Pricing runs £19–89/month and includes quoting, invoicing, and basic job scheduling.
This is a good option for a sole trader Gas Safe engineer who needs compliant certs without paying Commusoft prices. If your volume is moderate and you don't need automated reminders, Powered Now covers the compliance side at a significantly lower monthly cost.
3. Sleepless Tradesman — Best for AI Quoting on Boiler Installations and System Upgrades
Sleepless Tradesman doesn't include gas safety certificate generation, but stands out for AI-powered quoting: describe a boiler installation job in plain language and the AI generates a structured quote with materials, labour, and VAT in under 2 minutes. For a gas engineer who spends significant time quoting boiler replacements, heat pump conversions, or system upgrades, the time saving compounds quickly. Free tier available, with Pro at £29.99/month.
No built-in CP12 — you'd need a separate certificate app or paper records alongside it. The practical combination for many sole trader gas engineers is Powered Now for certificates and Sleepless Tradesman for quoting and job management — total cost is still significantly below Commusoft.
4. Tradify — Best for Gas Installation Work Without Landlord Contract Volume
Tradify is popular with UK tradespeople for its straightforward diary, quoting, and invoicing. No gas safety certificate features, but the job record system lets you attach PDFs of certificates to job records for storage. At £39–49/month it is cheaper than Commusoft for engineers who don't need automated reminders and are happy to store certs manually.
Better suited to gas engineers whose work is primarily installation — boilers, heating systems, central heating — rather than landlord gas safety contracts. The clean interface and reliable core features make it a well-regarded choice among UK trades, even if it lacks gas-specific compliance tools.
5. ServiceM8 — Best for Reactive Emergency Gas Call-Outs
ServiceM8 uses per-job pricing that suits reactive emergency gas call-outs where volume is unpredictable. No built-in CP12 or gas safety compliance features — Gas Safe engineers using ServiceM8 would need to manage certificates separately. The custom forms engine could in theory replicate a gas safety record, but this requires significant setup and is not a supported use case.
Good for the reactive side of a gas engineer's work — emergency boiler breakdowns, no-heating call-outs, gas leak investigations — but not a compliance tool. Engineers with a mixed workload of reactive and contract work might use ServiceM8 alongside Commusoft or Powered Now, though the added complexity needs to be weighed against the benefit.
CP12 Certificates Explained — What Your Software Must Store
A CP12 (Landlord Gas Safety Record) documents: all gas appliances and flues at the property, test results, the engineer's Gas Safe registration number, inspection date, and the next inspection due date. Landlords are legally required to have a gas safety check by a Gas Safe registered engineer annually.
- The certificate must be issued to the tenant within 28 days and to new tenants before they move in
- Engineers must retain a copy for at least 2 years
- Gas Safe registration number must appear on every certificate
- Digital CP12 records: Commusoft creates them fully digitally; Powered Now uses PDF templates filled in on site — both satisfy Gas Safe requirements
The key requirement for any digital CP12 is that your Gas Safe registration number is on the certificate and records are retained for 2+ years. Losing records is not just an organisational problem — it can result in Gas Safe Register action if records cannot be produced during an inspection.
Our Verdict
For landlord gas safety contract work: Commusoft is the clear choice. The automated CP12 system and service reminders can't be matched at any lower price point — the time saved on chasing renewals and issuing certificates to landlords alone justifies the subscription for any engineer with 20+ annual contracts.
For sole traders who do a mix of gas installation and reactive work: Powered Now for certs combined with Sleepless Tradesman for AI quoting is a viable combination at lower cost than Commusoft. Powered Now handles the compliance side; Sleepless Tradesman speeds up quoting for boiler installs and system upgrades.
For emergency reactive gas work: ServiceM8's per-job pricing model suits unpredictable volumes — you only pay for active work months.
Frequently Asked Questions
What software do gas engineers use for CP12 certificates?
Commusoft is the most widely used software for digital CP12 certificates in the UK. It creates, stores, and automatically emails CP12 Landlord Gas Safety Records to landlords and tenants from an iOS or Android app on site. Powered Now offers gas safety certificate templates for gas engineers who want a cheaper alternative. Both are Gas Safe compliant.
Do I need software to produce a CP12 certificate?
No — a paper CP12 is legally valid as long as it contains all required information and is signed by a Gas Safe registered engineer. However, digital certificates produced by software like Commusoft or Powered Now are faster to issue, harder to lose, and simpler to present during a Gas Safe inspection. Digital records are strongly recommended for any gas engineer doing 10+ certificates per month.
What is the best free software for gas engineers?
Sleepless Tradesman is the only free option that includes AI quoting and job management, but it does not produce CP12 certificates — you'd need a separate certificate app or paper records. For gas engineers who specifically need digital certificate features, Powered Now at £19/month is the cheapest paid option.
Can gas engineers use job management software to track boiler service dates?
Yes. Commusoft sends automated reminders by email or SMS to customers when their annual boiler service is due. Tradify and other apps allow manual diary notes for service dates but do not send automated reminders — you'd need to export a list and contact customers yourself.
What records must a Gas Safe engineer keep?
Gas Safe engineers must keep a copy of every gas safety certificate (CP12) for at least 2 years. Landlords must receive a copy of the annual Landlord Gas Safety Record within 28 days of the check, and new tenants must receive it before moving in. Job records including engineer Gas Safe registration number, property address, appliances checked, and test results should all be stored.