Certificates written up at 9pm
Landlord records, service sheets and warning notices shouldn't eat your evenings. Fill them on your phone at the property and send the PDF before you pack up.
CP12s and gas certificates, sorted on your phone
Fill landlord gas safety records, LGSR and every gas certificate on site, get them signed, and send the PDF before you leave — then quote, invoice and take card payments from the same app.
Free to start · No card · No download needed — works in your browser
Every gas certificate you're required to issue
Real, fillable PDFs generated on your phone and stored against the job — not scans of a paper pad.
Sound familiar?
The admin headaches every gas engineer knows — solved.
Duplicate books and lost paperwork
Every CP12 and gas certificate is stored digitally against the job and the customer, signed on your phone — no more pads, no more re-issuing lost copies.
Chasing payment once the gas work's done
Send the invoice alongside the certificate with a card payment link, so you're paid days faster instead of waiting on a bank transfer.
Built around a gas engineer’s working day
Every gas certificate in one app
Landlord and commercial gas safety records, domestic safety, service & maintenance, catering, tightness tests and warning notices — generated as proper PDFs, not photos of a pad.
Signed on the customer's phone
Capture the signature on site; the finished certificate is stored against the job and ready to email or WhatsApp instantly.
Quotes & invoices from the same place
Price up boiler swaps and repairs, invoice on site with parts and labour itemised, and take card payments by link.
Works offline behind the boiler
No signal in the plant room? Fill certificates and log jobs offline — everything syncs the moment you're back online.
Need the full tour? See everything the TradePlanr app does including digital signatures and job sign-offs.
Not the one on the tools? There’s a version of this page for whoever runs the office.
Got engineers on the books? TradePlanr for heating companies and gas firms.
Free calculators every gas engineer can use
No sign-up, no subscription — the same trade calculators built into the TradePlanr app, free on the web.
Gas Rate Calculator
Timed meter test — natural gas or LPG, metric or imperial — with live kW results.
Gas Pipe Sizing (Copper)
Minimum copper pipe size for a load over a run (1 mbar drop, natural gas).
Ventilation Requirement
Free vent area for an open-flued appliance by location.
Radiator / Room Sizing
Approximate heat requirement for a room from its size and use.
Expansion Vessel Sizing
Minimum vessel size for a sealed heating system.
System Volume Estimate
Approximate water content of a heating system.
Cylinder Reheat Time
Time and energy to heat a hot water cylinder.
Flow Rate from kW & ΔT
Required circulation flow for a heat load at a design ΔT.
Radiator ΔT Output Correction
Convert a radiator’s catalogue output to the output at your system’s ΔT.
Underfloor Heating Pipe Length
Estimate UFH pipe length and loop count from floor area and pipe spacing.
Boiler / Heat Pump Sizing
Estimate whole-house heat loss and the boiler or heat pump size to match.
Heat Pump vs Gas Running Cost
Compare the annual running cost of a heat pump against a gas boiler.
Running Cost
What an appliance costs to run at a given tariff.
Unit Converter
Common trade unit conversions.
Markup & VAT
Sell price from cost, markup and VAT.
Job Price / Quote Builder
Build a quote from materials, labour and margin.
Day Rate ↔ Hourly Rate
Convert between hourly, day, week and year.
CIS Tax Deduction
CIS deducted and net pay on a subcontractor invoice.
VAT Flat Rate vs Standard
Compare VAT owed on the flat rate and standard schemes.
Self-Employed Tax & NI
Estimate Income Tax, Class 4 NI and take-home from your annual profit.
VAT Registration Threshold
How close your rolling turnover is to the £90,000 VAT registration threshold.
What Should I Charge?
Work back from the income you want to the day and hourly rate you need to charge.
Late Payment Interest
Statutory interest and compensation you can claim on an overdue commercial invoice.
Deposit & Staged Payments
Split a job into a deposit and staged payments.
Retention (Commercial)
Retention held on a contract and when each half is released.
Mileage / Fuel per Job
Mileage claim or actual fuel cost for a journey.
Real Hourly Rate
Your true hourly rate once travel, quoting and admin time are counted.
Join gas engineers across the UK using TradePlanr
Start free in your browser and set up your first job in minutes — no download needed.