greenhomesums
greenhomesums blog
Plain-English writeups on UK solar, heat pumps, EPC, the Ofgem price cap and green-home grants. Written by the team behind the calculators.
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· 3 min read · insulation grants energy-saving
Cavity wall insulation cost UK 2026: price, savings and is it worth it?
Cavity wall insulation costs £400–£1,000 for a typical UK home in 2026 and saves £200–£400/yr. ECO4 funds it free for eligible households. Here's what drives the price and when it's worth it.
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· 4 min read · heat-pump grants running-cost
Air source heat pump cost UK 2026: install price, running cost and payback
Air source heat pumps cost £8,000–£14,000 installed in the UK in 2026. After the £7,500 BUS grant, net cost is £500–£6,500. Here's what drives the price and how to avoid being overcharged.
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· 3 min read · battery tariff
Home battery storage UK without solar: cost, payback and is it worth it?
A home battery without solar can pay back in 7–10 years on Octopus Flux — but only if you're on the right tariff. On a flat rate it saves you nothing. Here's the honest breakdown.
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· 3 min read · insulation grants energy-saving
Loft insulation cost UK 2026: how much does it cost and is it worth it?
Loft insulation costs £300–£600 for a typical UK semi and pays back in 1–3 years. ECO4 funds it for free for eligible households. Here's the full cost breakdown and savings figures.
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· 4 min read · solar battery tariff
Solar battery storage UK: cost, payback and is it worth it in 2026?
Solar battery storage in the UK costs £3,000–£6,000 added to solar. For most homes it's worth it if your SEG rate is below 10p/kWh — here's the honest maths.
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· 3 min read · solar tariff seg
Best SEG export tariffs 2026: who pays most for your solar
A straight comparison of every major UK Smart Export Guarantee tariff for 2026 — from Octopus Outgoing Fixed at 15p to Rebel at 2.5p. Who you can switch to without also switching imports, and how much that choice is worth per year.
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· 3 min read · tariff price-cap ofgem
What the new Ofgem price cap means for your bill
The Ofgem default-tariff price cap changes every three months. Here's what it actually caps, who it affects, and what the latest reset does to a typical UK household's bill — for electricity, gas and dual-fuel, by payment method.
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· 4 min read · landlord epc mees heat-pump
EPC C by 2028: what landlords and homeowners need to do now
The proposed 2028 Minimum Energy Efficiency Standard uplift to EPC C is coming, and most UK housing stock isn't ready. Here's the actual compliance pathway, who it hits hardest, and the cheapest measure stack to get you there.
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