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Patios, decking, fencing, drainage and lawns — describe the job and get the kit list, the tonnage and the levels sorted before the grab lorry comes. Sub-base, concrete, decking and falls worked out and on the shopping list.
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.
"Patio Monday, 5 by 4 with a sub-base — what do I need?" The Gaffer lists the kit, the falls, the CAT scan and what to check before you dig — levels against the DPC, where the water goes.
Type 1 in tonnes, sharp sand, concrete for the edging haunch, fall over 5 metres. Each drops into the right calculator.
Sub-base, slabs, edging, jointing compound and geotextile land on a shopping list with a merchant link on every line.
The patio sits on the job's checklist. Tick it layer by layer, share it with the lad on the wacker, invoice when it is pointed.
Free, no account needed. Quantities go straight onto a shopping list.
Gravel / Topsoil
Volume + tonnage (UK bulk-bag yield)
Type 1, gravel and topsoil in tonnes and bulk bags from area and depth.
Concrete
Volume + bag count for slabs, footings, posts
Haunching, post holes and bases with bag counts.
Decking / Roofing
Boards, joists & felt by area
Boards, joists and fixings by deck area.
Drainage Fall
Gradient 1:N → fall over length
Fall over a drain or channel run at the typical gradient for the pipe type, 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
"5 by 4 patio with a 100mm Type 1 sub-base — how many bulk bags?"
20 square metres at 100mm compacted is 2 cubic metres, but you lay it loose and compact it down, so allow around 2.4 loose. Type 1 runs roughly 1.7 tonnes a cube, so you are at about 4 tonnes — five 850kg bulk bags, or a 4 tonne grab which is cheaper. Compact it in two lifts, and set your lines at a 1 in 60 fall away from the house before the sand goes on.
Always verify to current regs. On-site conditions may vary.
Yes. The gravel and topsoil calculator turns area and depth into cubic metres, tonnes and bulk bags using UK densities and bulk-bag yields for Type 1, gravel and topsoil. Add your own allowance for compaction; the Gaffer will tell you how much.
Yes. The decking calculator gives boards, joists and fixings by area, and the Gaffer builds fencing and turfing lists from the job you describe. The landscaper persona references BS 3882 topsoil and BALI practice.
The drainage fall calculator gives the fall over a run at the typical gradient for each pipe type, and the Gaffer will tell you where the water should go and when an Aco channel or soakaway is needed. Always check local drainage rules.