EcoSaving Hub — calculator-led lead generation for the UK retrofit market

Calculators

all working, no fakes

Programmatic city pages

1,265

5 calc × 253 cities

Avg. calc completion

67%

across early sample

Lighthouse score

mobile, all 5 calcs

The conversion advantage of working calculators

A user who has just spent 90 seconds entering their home details, electricity tariff, and roof orientation into a solar PV calculator has self-qualified to a degree no form ever could. They've declared intent and given the sales operator the project specs.

That is the unit-economics insight behind EcoSaving Hub: let users compute their own savings, then route the qualified lead with the project specs already attached.

What each calculator does

Calculator	Inputs captured	Output
Heat pump payback	Home type, current heating, BUS grant eligibility	Annual saving + payback + BUS estimate
Solar PV + battery ROI	Roof orientation, system size, tariff, battery	25-yr net saving + payback
Insulation breakeven	Property type, era, fuel, measure	Breakeven years + 30-yr saving
Smart heating savings	Current controls, target controls, occupancy	10-yr net saving
Whole-home retrofit	EPC, fabric state, heating, target	Sequenced 4-stage budget

What we did NOT do

We did not use a JS framework. All five calculators are vanilla JS, single HTML file each, fully indexable, and load in <100ms on a mid-range mobile.
We did not paywall the result. The calculation is the value — capturing the lead is incidental.
We did not inflate the numbers. Solar uses 950 kWh/kWp annual yield (PVGIS UK central estimate); insulation savings follow EST/BRE published fractions; heating controls follow the 2018 BEIS field trial.

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