Gas certificate app
A gas certificate app for engineers working for themselves
Write the landlord's gas safety record while you are still standing at the boiler, get the next deadline right, and invoice the same visit from the same place. Built for one person who does the work and the paperwork, not for a firm with an office.
- 9
- particulars regulation 36 requires on the record
- 28
- days to get a copy to an existing tenant
- 0
- per-seat fees, because there are no seats
What the record has to carry, and who decides
A landlord's gas safety record is not a form somebody sells you. Regulation 36(3)(c) prescribes what the record has to contain and says nothing at all about how it is laid out, which is why a record written on a phone is the same instrument as one written on a pad.
| Where it says so | |
|---|---|
| The date the check was carried out | Regulation 36(3)(c)(i) |
| The address of the premises | Regulation 36(3)(c)(ii) |
| The landlord's name | Regulation 36(3)(c)(iii) |
| The landlord's address | Regulation 36(3)(c)(iii) |
| At least one appliance or flue | Regulation 36(3)(c)(iv) |
| A description, a location and an outcome for every appliance, and what was wrong with any that failed | Regulation 36(3)(c)(iv) to (vi) |
| Your confirmation that the check met regulation 9 | Regulation 36(3)(c)(vii) |
| The name of the engineer who checked it | Regulation 36(3)(c)(viii) |
| The engineer's signature | Regulation 36(3)(c)(viii) |
| The Gas Safe registration number | Regulation 36(3)(c)(ix) |
Who gets a copy, and by when, is set out separately:
| What is required | Where it says so | |
|---|---|---|
| An existing tenant | A copy of the record is given within 28 days of the date of the check. | Regulation 36(6)(a) |
| A new tenant | A copy of the last record for each appliance or flue is given before that tenant occupies the premises. | Regulation 36(6)(b) |
| Anyone in lawful occupation | The record, or a copy, is made available on request and on reasonable notice for inspection by a person who may be affected by an appliance the record covers. | Regulation 36(5) |
The renewal date is not twelve months from the day you attended
This is the part that is quietly wrong in a lot of diaries, and it is wrong in the direction that costs the landlord. The obvious rule, twelve months from the day it was checked, is not what regulation 36A says.
| What it does | Where it says so | |
|---|---|---|
| Checked early | A check completed within the 2 months ending with the deadline date is treated as having been made ON the deadline date. The next 12 months run from the deadline, not from the day you attended. | Regulation 36A(1) |
| Checked late, to line two appliances up | The landlord may instead check within the 2 months BEGINNING with the deadline date. That discretion may be used only once per appliance or flue, and only to align its deadline with another appliance in the same premises. | Regulation 36A(2) and (3) |
Where My Job Goblin fits
None of the above is a software problem until a letting agent asks for last year's record for a flat you visited once, in February, in the rain. This is job management software for gas engineers built around that: the record, the quote, the photographs and the invoice stay attached to the address rather than to whichever pad was in the van.
Write the record on the doorstep, not on a pad in the van
Appliance by appliance: description, location, outcome, and what was wrong with anything that failed. It saves as a draft while the boiler is still apart, so a job interrupted halfway does not start again.
It will not let an incomplete record out
Every particular regulation 36(3)(c) lists is checked before a record can be issued, and anything missing is named with the sub-paragraph it comes from. A pad will happily let you sign a record with no registration number on it.
The renewal date is worked out, not guessed
The next deadline is computed from the previous one rather than from the day you attended, so an early check does not quietly walk the landlord's anniversary backwards. Certificates coming up for renewal show against the property.
The record is checkable without an account
Every issued record carries a code, and a landlord, agent or tenant can enter it to see what was issued, by whom and when. It reports what was issued rather than whether it is valid.
Your own qualifications, scheme memberships and insurance are stored with their expiry dates alongside all of it, so a registration coming up for renewal is visible before it lapses rather than after.
What it deliberately does not do, so you find out here rather than later:
- It does not make you or the record Gas Safe registered. What makes a record valid is the registration behind the signature, and that sits with the scheme. The app carries your number onto the document; it does not check it and it does not talk to the register.
- It does not write an EICR, an Electrical Installation Certificate or an unvented hot water certificate. A minor electrical works certificate is written here; the rest are different instruments from a single-job form.
- There is no dispatch, no shared diary and no engineer tracking. It is built for one person who does the work and the admin.
- There is no offline mode. It needs a connection, and there is nowhere for a record written in a basement plant room with no signal to go until it comes back.
What it works out once the jobs are in it
Every figure below is worked out from your own quotes, jobs and invoices. Nothing here is a comparison against anybody else.
| What it claims | When it will show it | |
|---|---|---|
| Revenue per available working day | Money received in a period divided by the working days that period actually held, taken from the working pattern the trader sets. The trades equivalent of a hotel's revenue per available room, and it decomposes the same way: effective day rate multiplied by utilisation. | 5 available working days and at least one booked day in the window |
| Why revenue moved | The change in invoiced revenue against the previous 30 days, split into ranked contributing factors: how many jobs were invoiced against what the typical job was worth, with quotes sent as upstream context. | 2 invoices in each period and a change of at least 15 per cent |
| Quote speed against win rate | Whether quotes the trader sends within 24 hours convert better than the ones they send later, measured on their own decided quotes rather than on a general rule of thumb. | 3 decided quotes in each bucket and a gap of at least 10 percentage points |
| Margin per job over time | One point per won job, priced against its materials and subcontractor cost, plotted by job date and split weekday against weekend so an out-of-hours premium can be checked rather than assumed. | 5 won jobs with a recorded cost, and 3 in each of the weekday and weekend buckets before the split is drawn; jobs with no recorded cost are excluded, not counted as zero |
| Quote win rate | The share of decided quotes that were accepted, shown with a Wilson score interval and the sample size, so the figure carries the range it could really be. | 10 decided quotes |
| Utilisation | Days booked against days available. Deliberately uncapped, so a weekend worked reads as over 100 per cent rather than being flattened to a full week. | a working pattern set, and 5 available working days in the window |
| Time to get paid | A value-weighted days-sales-outstanding figure, so one large invoice paid late moves it more than several small ones do. | 3 paid invoices |
| Typical job value | The median value of a won job, not the mean, so a single unusually large job does not redefine what typical means. | 3 won jobs with a recorded price |
| Time from quote to job | The median gap between sending a quote and the work starting, which is the lead time a trader is really working to when they fill a diary. | 3 won quotes with both dates recorded |
Sources
Every regulatory statement on this page was read from the instrument it cites on legislation.gov.uk, not from a summary of it. The widely repeated line that a landlord keeps the record for two years is not here in that form, because regulation 36(3)(c) retains it until there have been two further checks and the two year rule covers the case where the appliance has been removed.
- The Gas Safety (Installation and Use) Regulations 1998, regulation 36SI 1998 No. 2451. Paragraph (3)(a) sets the interval of not more than 12 months. Paragraph (3)(c) lists the nine particulars a record must carry, at (i) to (ix), and sets the retention rule: until there have been two further checks, or two years from the last check where the appliance or flue has been removed. Paragraphs (5) and (6) cover who gets a copy and when.
- The Gas Safety (Installation and Use) Regulations 1998, regulation 36AInserted by SI 2018 No. 139, in force 6 April 2018. Paragraph (1) treats a check completed in the two months ending with the deadline date as made on the deadline date. Paragraph (2) allows a check in the two months beginning with it instead, and paragraph (3) limits that to once per appliance and only to align deadlines within the same premises.
- HSE: landlords' gas safety responsibilitiesThe Health and Safety Executive's own answers on the duties in regulation 36, including what a landlord has to hold and hand over.
- Making Tax Digital for Income TaxHMRC's guidance on the qualifying income thresholds, the dates each band starts from, and the software HMRC recognises.
This page states what the regulations say. It is not legal advice, and whether a particular duty applies to a particular job turns on the premises, the tenure and who commissioned the work. Last reviewed 4 September 2026.
Write your next record in it
The free tier runs three quotes and three invoices a month, end to end, with no card and no countdown.
Frequently asked questions
What is a gas certificate app?
Somewhere to write the landlord's gas safety record on the job rather than on a pad, with the rest of the paperwork attached to it: the quote, the photographs, the invoice for the same visit. For a sole trader the point is not coordinating a team, it is that the record and the invoice for one visit are not in two different places.
Is there a gas engineer app, or is it a website?
It runs in the browser on your phone, so there is nothing to install and nothing to update. Writing a record on a doorstep is the case it was built around, which is why a part-finished record saves as a draft rather than needing to be done in one go.
Does it issue a CP12?
It writes a landlord's gas safety record, which is the document the law actually names. CP12 is not a statutory form: it stands for CORGI Proforma 12 and is a commercial pad brand. Regulation 36(3) prescribes what the record must contain and says nothing about its layout, so a record carrying the nine required particulars is a record whatever the pad on the van looks like.
How long does a landlord have to keep the record?
Regulation 36(3)(c) requires it to be retained until there have been two further checks of that appliance or flue. The widely repeated two year rule applies where the appliance or flue has been removed from the premises, measured from the date of the last check.
When is the next check due if I attend early?
Regulation 36A(1) treats a check completed within the two months ending with the deadline date as having been made on the deadline date, so the next twelve months run from the original deadline rather than from the day you attended. The app computes the next deadline from the previous one for that reason. Get it wrong and the landlord's anniversary walks backwards a little every year.
Does it track my Gas Safe registration?
Your own qualifications, scheme memberships and insurance documents are stored with their expiry dates, so a registration about to lapse is visible before it does. It does not renew anything for you, it does not verify your number, and it does not talk to the register.
What happens to my records if I stop paying?
You keep access to your own data and can export it. A gas record can be one a landlord relies on for years, and a sole trader has to keep business records well beyond the filing deadline, so software that strands them when a subscription ends is a problem rather than a feature.
Does My Job Goblin tell me whether I am actually making money?
Yes, and that is the half most job software leaves out. It records the quote and the invoice like anything else, then does the arithmetic on top: revenue per available working day, margin per job against materials and subcontractor cost, quote win rate with the range it could really be, and how long customers take to pay weighted by the size of the invoice. Turnover on its own hides all four. No figure is shown on a sample too small to support it. Where there is too little history the card renders nothing, rather than a number with a caveat underneath it.
What is revenue per available working day?
It is what a day of your available time earned, rather than what you charged for a day you worked. Take the money received in a period and divide it by the working days that period held, from the working pattern you set. Hotels have measured this for decades as revenue per available room, because a room nobody booked is revenue that can never be recovered. A Tuesday you did not fill is exactly the same thing. My Job Goblin decomposes it the way a hotel does, into your effective day rate multiplied by your utilisation, so you can see which of the two moved.
Does it compare my prices against other tradespeople?
No, and that is deliberate. There is no benchmarking against other businesses. Trades publish no prices, day rates or availability in any machine-readable form, so a peer comparison in this market is either a very small sample or an invented one. Every figure compares a trader against their own history. A benchmark against a handful of unrepresentative businesses, or against a number nobody can source, is worse than no benchmark at all.
How much is it?
Pro is £29 a month or £290 a year, with no per-seat fees and no contract. Every new account starts on a 14 day free trial of Pro with no card needed, and drops to the free tier rather than switching off. The free tier runs 3 quotes and 3 invoices a month, end to end: build the quote, send the PDF, let the customer approve it in the portal, and invoice it. The AI pricing and description tools, expense tracking, certificate filing and reports are Pro. The HMRC year-end tools are Pro + Tax.
Why is the free tier so small?
The cap is small on purpose. A free tier big enough to run a trade on has to be paid for by the traders who do pay, and they are one-person businesses on a flat £29 a month with no per-seat fee. What the free tier proves is the whole loop rather than the volume: build the quote, send it, let the customer approve it, invoice it.