UK home energy briefing
Home Energy Efficiency in the UK: Insulation, Heat Pumps and Where the Savings Are
Every home energy efficiency guide on this site answers the same three questions with real 2026 numbers: what the measure costs installed, what it saves a year, and which grant pays for it.
Start with the loftField reports: insulation, heat pumps and solar
All guides
Solar Panels in the UK: Cost Installed, Real-World Output, Grants and Whether They're Worth It
Loft Insulation: Cost, Grants, the Right Depth and DIY Options
Air Source Heat Pump Guide: Cost After Grants, How It Works and What Installation Involves
EPC Rating Explained: How to Check Yours, Improve It, Understand the Bands and Meet Landlord Rules
Cavity Wall Insulation: Cost, the Problems to Check For, and the Grants That Still Pay
Home energy efficiency savings: the real numbers
UK homes are among the leakiest in western Europe, which is also the good news: the cheap fixes still haven't been done in millions of houses. About a quarter of an uninsulated home's heat leaves through the roof and a third through the walls — which is why home energy efficiency work starts with fabric, not gadgets.
The sector's own numbers point the same way: Energy UK's retail energy-efficiency work treats demand reduction as the cheapest unit of energy there is, and research on building retrofits — like the heat-loss field trials covered by ScienceDaily — keeps finding that measured performance tracks the boring basics: insulation depth, airtightness, and heating run at the right temperature. That is where the savings actually come from.
Loft top-up£250/yr
Cavity walls£185/yr
1°C thermostat~9%
4kWp solar£590+/yr
Energy Saving Trust-aligned figures, semi-detached, Jan 2026 prices
The Regions 202020 archive, 2010–2014
This domain began as the home of ENNEREG, a European programme under the EU's Intelligent Energy Europe initiative in which twelve pioneer regions built regional sustainable-energy plans in support of the 20-20-20 climate targets. The programme's reports, regional case studies, newsletters and events calendar are preserved here as a historical record — energy efficiency at the scale of regions, where this site now covers it at the scale of a house.
Home energy efficiency FAQ
What improves home energy efficiency the most?
Per pound spent: loft insulation first, cavity wall insulation second, then heating controls. Heat pumps and solar panels deliver the biggest absolute cuts but need the fabric measures done first to perform at their price.
What grants exist for home energy efficiency in 2026?
The Warm Homes Plan replaced ECO4 and the Great British Insulation Scheme in March 2026 for insulation measures, the Boiler Upgrade Scheme pays £7,500 towards a heat pump, and VAT on solar and batteries is zero-rated until March 2027.
What order should I do the work in?
Fabric first: loft, then walls, then draught-proofing and controls. Electrify after that — a heat pump sized for an insulated house is smaller and cheaper to run — and add solar whenever the roof allows; it stands on its own economics.
How much can a typical house save?
A gas-heated semi going from poor to good — insulated loft and walls, a smart thermostat, flow temperature set right — typically cuts £400–£600 a year at current prices before any heat pump or solar investment.