The short answer
The lowest-priced ways to lift an EPC rating are usually LED lighting (around £100–£300 for a typical house, gaining roughly 3–8 points), topping up loft insulation to about 270mm (£300–£600 installed, around 5–10 points), draught proofing (£30–£100) and a hot water cylinder jacket (around £15–£25). Larger measures move more — cavity wall insulation can add roughly 10–20 points and solid wall insulation around 15–25, while an efficient boiler, double glazing or solar panels all help. A spend of around £500 on the lowest-priced measures can often gain enough points to jump a full band. Your EPC's recommendations report lists the measures suited to your specific property.
Every EPC comes with a recommendations report that lists improvements ranked by impact. The measures below are the ones that typically give the most points per pound across UK homes.
Lowest-priced first
- Cylinder jacket~£15–£25, 1–3 pts
- LED lighting~£100–£300, 3–8 pts
- Draught proofing~£30–£100
- Loft insulation~£300–£600, 5–10 pts
- Cavity wall~10–20 pts
The lowest-priced measures
The strongest points-per-pound usually come from inexpensive, low-disruption work. Fitting LED lighting throughout is now inexpensive and lifts the score; topping up loft insulation to around 270mm is one of the strongest value measures; draught proofing around doors and windows and adding a jacket to the hot water cylinder both cost little. The assessment rewards measurable efficiency, so these tangible upgrades register where behaviour alone does not.
| Measure | Typical cost | Typical points |
|---|---|---|
| Cylinder jacket | £15–£25 | 1–3 |
| LED lighting (whole house) | £100–£300 | 3–8 |
| Draught proofing | £30–£100 | small uplift |
| Loft insulation top-up | £300–£600 | 5–10 |
Indicative figures for guidance; gains depend on the property's starting point. Source: Energy Saving Trust and EPC improvement guides.
Bigger measures that move a band
To climb a whole band you usually need at least one larger measure alongside the cheap ones. Cavity wall insulation can add roughly 10–20 points and solid wall insulation around 15–25; an efficient modern boiler or heat pump, double or triple glazing, and solar panels all contribute. Crucially, the EPC is recalculated on a fresh assessment, so after completing upgrades you need a new EPC to record the higher rating. Work through your certificate's recommendations report, which ranks measures by impact for your home.
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Frequently asked questions
What is the lowest-priced way to improve my EPC rating?
The lowest-priced measures are usually a hot water cylinder jacket (£15–£25), LED lighting throughout (£100–£300), draught proofing (£30–£100) and topping up loft insulation (£300–£600). Around £500 of these can often lift a full band.
How many points do I need to change EPC band?
Each band spans a range of SAP points, so the number depends on your starting position within a band. Combining cheap measures such as LED lighting and loft insulation with one larger measure often gains enough points to move up a band.
Do I need a new EPC after making improvements?
Yes, to record a higher rating. The EPC reflects the property as assessed, so after completing upgrades an accredited domestic energy assessor needs to reassess it for the new band to appear on the EPC Register.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property. They are guidance, not a quotation.