I didn't research decarbonising a home.
I did it.
I'm Gareth, the founder of Decarbonarma. Everything on this site comes from one place: my own house, my own invoices, and my own meter readings. No installer pays me to say any of it.
What I actually installed
This isn't a demo home or a manufacturer showcase. It's a lived-in UK house, decarbonised step by step over four years. Here's the full list, with real prices:
| Install | Kit | Cost |
|---|---|---|
| Solar + battery (2022) First array | 12× Viridian 405W (~4.9 kWp), Sonnen 15 kWh battery with 3 kW backup circuit | ~£20,000 |
| Re-roof + insulation (Oct 2025) | SuperFOIL SF40BB breather membrane over rafters, SF60 on the loft joists | Part of re-roof |
| Solar, second array (Oct 2025) +4 garage panels, May 2026 | 18× Aiko 510W (~9.2 kWp), 9 north / 9 south, Enphase IQ8HC microinverters | ~£10,000 |
| Air-to-air heat pump (Nov 2025) | Daikin 3MXM52A9 multi-split, 3 indoor units heating and cooling the main living areas | £5,300 0% VAT |
| Hot water (Feb 2026) | Sunamp Thermino 300e heat battery (~12 kWh), replacing a limescale-killed cylinder | £4,774 inc. VAT |
Why the numbers here are different
Most UK energy content is written by people who have never bought the kit. Installers' blogs want to sell you a survey. The big consumer sites write from press releases. I was quoted £27,000 before the grant for a conventional air-to-water heat pump system; I heated my home a different way for around £10,000 all-in — and I publish the running data to show how it's working out.
On a good June day my panels generate over 64 kWh. The north-facing half of my roof produces about 70% of what the south side does — a number almost nobody publishes, because almost nobody metres it panel by panel. That's the standard this site aims for: numbers you can check, from a house that exists.
As seen on Skill Builder
My install has been featured twice on Skill Builder, Roger Bisby's UK building channel — not known for going easy on heat-pump hype.
Read the case studies
The full write-ups, with costs and data:
The Superfoil re-roof and solar install · Air-to-air heat pump + Sunamp: the £10k route · Sunamp Thermino 300e: six months in · Rose Cottage: the live data, half-year report
Or start with the free tools: Home Energy Adviser, Solar Generation Calculator, Heat Loss Estimator and Tariff Finder.
If the site saves you from an expensive mistake, you can buy me a coffee.