Home Grants & Energy2 min check

EPC Improvement Checker

Get a tailored list of upgrades that typically move a property up the EPC scale — useful for landlords and sellers.

Short answer

An EPC is scored 1–100; band C starts at 69 points, band D at 55, band E at 39. Typical uplifts: loft insulation +5–10 points, cavity wall +6–10, new condensing boiler +5–8, solar PV (4kWp) +8–14, LED lighting +1–2, heating controls +2–3. Most D-rated homes can reach C with a focused £3k–£8k spend.

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Calculation method, coverage and version

Inputs used: Current EPC rating, Target rating, Loft insulation, Walls, Glazing, Main heating.
Calculation approach: The calculator applies the rules and assumptions described in “How it works” to the values you enter. Rounding can cause small differences from an official or provider calculation.
Coverage: Home Grants & Energy. UK nations, tax treatment, local rules and provider criteria can differ; check the official sources shown below before acting.
Content version: No page-specific review date is currently published. Treat the result as indicative and verify current rules independently.

Not included unless explicitly requested: personal circumstances not entered, provider discretion, future rule changes, professional fees and case-specific exceptions. Read the full calculator methodology.

Primary sources and official verification

Use these official sources to verify current rules before acting. Coverage and dates can differ across England, Scotland, Wales and Northern Ireland.

Energy Company Obligation (ECO) — Ofgem

See the sitewide source policy.

How it works

The model takes your starting band, applies typical RdSAP uplifts per measure (the methodology assessors use), and predicts your finishing band. It's deliberately conservative — measures don't stack linearly because each upgrade reduces the savings available to the next.

Worked example

Band D (60 points) home with no loft insulation, gravity hot water and 1990s boiler → loft (+8) + new boiler with controls (+9) + LEDs (+2) = 79 points = band C. Cost: £3,500–£5,000.

Who should use this

•Landlords needing to hit MEES band C by 2028 (proposed)
•Sellers wanting a better EPC for valuation
•Homeowners chasing lower bills before retiring

Common mistakes

×Spending heavily on solar without first insulating — assessors weight fabric measures heavily
×Forgetting controls — programmer + room thermostat + TRVs is cheap and adds points
×Using non-RdSAP-recognised products (some heat pumps and LEDs don't score without paperwork)

Frequently asked questions

How long is an EPC valid?▾

10 years. Re-lodge once measures are done to bank the new rating.

Will band C be mandatory?▾

Government has consulted on requiring all rented homes to be EPC C by 2028 (new tenancies) and 2030 (all). Owner-occupiers are unaffected.

Does double glazing help?▾

Marginally — usually +1–3 points unless replacing single glazing.

Related calculators

ECO4 Scheme Checker →Insulation Grant Checker →Solar PV Savings Calculator →Landlord Compliance Checker →