Boiler swaps, bathroom installs, emergency leak repairs — describe the job and get a structured checklist of tools, fittings, PPE, and paperwork before you load the van. No more trips back to the merchant.
Free plan, no card needed. Pro is £24/month, with 5 days to try it.
Ask, work it out, buy it, tick it off — each step hands to the next. No app hopping.
"Boiler swap tomorrow, what do I need?" The Gaffer lists the kit, the flue question and the bits to check before you leave — system type, pipe sizes, where the condensate goes.
Radiator output for the room, pipe size for the flow, fall on the waste. Each number drops into the right calculator.
Valves, flue kit, inhibitor, filter and fittings land on a shopping list with a Screwfix, Toolstation or merchant link on every line.
The job sits on one checklist next to the Benchmark. Tick it as you commission, send it to the lad, invoice from the van.
Free, no account needed. Quantities go straight onto a shopping list.
Pipe Size & Flow
Velocity check (≤1.5 m/s domestic)
Velocity check for a pipe size and flow, so the run is not undersized and noisy.
Radiator Sizing
Watts/BTU heat output for a room
Watts and BTU for a room, so the rad you fit is the right one.
Drainage Fall
Gradient 1:N → fall over length
Fall over a waste or drain run at the typical gradient for the pipe, in millimetres.
AI-generated in under 60 seconds from your job description. Every section editable, shareable, downloadable.
30 years of trade know-how in your pocket. Straight answers to on-site problems, specific to the job you describe — and it reminds you of the bits you'd only remember halfway there.
The Gaffer
Your AI site mate
"What fall do I need on a 4-metre waste pipe run for a shower?"
Minimum 1:40 gradient for a 40mm waste pipe — that's roughly 10mm fall per metre, so 40mm over your 4m run. If you can't get the fall, look at a Saniflo or a condensate pump. Make sure you've got access to the trap and a vent where Building Regs require it.
Always verify to current regs. On-site conditions may vary.
Everything from copper fittings and pipe sizes to PPE, blow torch gear, testing equipment, and compliance paperwork. The AI adapts to your specific job — bathroom install, boiler swap, emergency repair, or commercial fit-out.
If your job description mentions gas work, the checklist flags Gas Safe certification requirements, gas testing equipment, and relevant compliance paperwork. Always verify you hold the correct gas qualifications.
Yes. Generate a share link and send it via WhatsApp or text. They get a read-only view of the full checklist with all sections. Pro users get unlimited sharing.