Improving an EPC score is arithmetic: your gap to the next band, divided into measures, cheapest points first. Each measure below shows what it typically adds to your rating and what those points cost, so lighting, controls and a loft top-up come before glazing and wall insulation.
+5 to +15 combined (LED, cylinder jacket, controls, draught-proofing) · from £50-£500 total for the full quick-win package · ~£10-£150 per point, the best value on any certificate
+2 to +10 points typically (documented at just +2 for £5,400) · from £3,000-£6,000+ (whole-elevation double glazing); £30-£250 (draught-proofing) · ~£1,000-£2,700 per point, the worst cost per point of the common measures
+10 to +20 points typically (varies with the SAP cost metric) · from £8,000-£15,000 gross; commonly £500-£7,500 net after the £7,500 Boiler Upgrade Scheme grant · Strong after the £7,500 grant; can be poor value gross
+2 to +5 (full controls) and +5 to +15 (non-condensing to condensing boiler) · from £150-£500 (controls) to £2,000-£3,500 (boiler) · ~£75-£150 per point (controls) rising to ~£200-£400 per point (boiler)
+2 to +20 depending on the measure (loft +5-15, cavity +5-15, floor +2-6, solid wall +10-20) · from £300-£800 (loft top-up) to £8,000-£15,000+ (solid wall) · ~£50-£100 per point (loft) rising to ~£500-£1,000 per point (solid wall)
+6 to +15 SAP points typically (property-dependent) · from £4,500-£8,000 for a ~4 kWp domestic system · ~£400-£800 per point, a mid-table value measure, rarely the cheapest first point
Letting a property? Our sister site covers meeting the MEES standard as a landlord.
Want it mapped out end to end? See a costed improvement plan, measure by measure.
Own a shop, office or unit? We also handle certificates for commercial premises.
For SBEM-modelled buildings, visit the non-domestic assessor service.