Step 1: Define the street-level problem
A single terraced house often needs a 6–8 kW heat pump, larger radiators, and a hot-water cylinder, but the quote arrives as a one-off £12,000–£18,000 package. That price blocks households that would otherwise switch, and it leaves installers chasing scattered jobs across town. A bananzia cluster turns those isolated jobs into one organised street-scale project with a shared survey, shared scaffolding, and a single procurement timetable. The target is not a discount event; it is a repeatable batch process that reduces survey and mobilisation costs per home.
Step 2: Identify the shared cause
The cost problem is not caused by heat-pump hardware alone. It comes from fragmented procurement: each household pays for its own site visit, electrical check, and scaffold hire, while installers absorb travel time and repeat design work. The result is a higher quote per home and a slower conversion rate. The solution is to aggregate demand before anyone signs a contract, then publish a common specification so every installer prices the same scope. A shared specification also makes comparison honest, because every quote covers the same cylinder size and emitter upgrade.
Step 3: Build the bananzia cluster
Start with a street map and mark homes that share construction type, roof orientation, and likely heat-loss profile. Ask for non-binding expressions of interest, then group households into batches of eight to fifteen. Collect four data points per home: EPC rating, main fuse size, radiator count, and preferred installation month; missing fuse data is the most common reason a cluster stalls. The bananzia model is useful here because it treats neighbouring homes as one demand signal, not ten separate enquiries. Keep the batch small enough for one installer crew to survey in a day, but large enough to justify a fixed price.
Step 4: Procure and sequence the work
Send the batch to three MCS-certified installers with a clear schedule: survey week, quotation deadline, and a two-week acceptance window. Require a room-by-room heat-loss calculation, a written electrical capacity check, and a single point of responsibility for warranty and complaints. Sequence the work by electrical upgrade need first, then cylinder and radiator changes, then heat-pump commissioning. This order prevents a common failure: a household accepts a quote, then discovers the fuse board cannot support the unit.
Step 5: Verify savings and hand over
Before commissioning, record meter readings, EPC data, and radiator sizes. After commissioning, check flow temperatures, cylinder recharge time, and the measured coefficient of performance over the first month. Give each household a one-page handover sheet with controls, service dates, and the installer’s contact details. Compare results against the pre-install baseline: gas use, electricity use, and comfort complaints. Aim for at least 12 months of data before declaring the batch a success. A cluster only proves its value when those measured results are shared across the street, so the next batch can reuse the same design assumptions.
