The EPC Rating Scale — A to G
The Energy Performance Certificate (EPC) uses a seven-band scale from A (most energy-efficient) to G (least energy-efficient). Each band represents a range of SAP (Standard Assessment Procedure) scores. The band directly affects annual energy costs, tenant appeal, rental yield and — crucially — legal compliance for.
A — Most Efficient92–100 · Typical: new builds, Passivhaus, deep retrofits with heat pump
B — Very Efficient81–91 · Modern new builds, properties with solar PV, heat pump or excellent insulation
C — Good69–80 · Well-insulated properties with modern gas boiler, double glazing
D — Average55–68 · UK average — most properties with gas central heating built 1990s–2000s
E — Below Average39–54 · MEES minimum for rentals — older properties with some insulation measures
F — Poor21–38 · Illegal to rent out without exemption in England
G — Very Poor1–20 · Illegal to rent out without exemption in England
What Does Each Band Mean for Annual Energy Costs?
The EPC shows estimated annual energy costs based on standardised occupancy assumptions (not actual usage). Typical annual figures for a mid-sized London property (3-bed terrace, ~100m²):
Band AUnder £600/year
Band B£600–£900/year
Band C£900–£1,300/year
Band D£1,300–£1,800/year
Band E£1,800–£2,500/year
Band F£2,500–£3,500/year
Band G£3,500+/year
Why EPC Band Matters for London
Your EPC band affects your property in multiple ways:
- Legal compliance: Bands F and G cannot be rented out without a valid MEES exemption (see MEES Regulations page).
- Tenant appeal: Prospective tenants increasingly factor energy costs into rental decisions. A Band C or B property is significantly more appealing than a Band E or F.
- Rental yield: Higher-rated properties can command higher rents as tenants know their fuel bills will be lower.
- Mortgage access: Some green mortgage products offer better rates for properties with Band C or above.
- Future-proofing: The Government has consulted on requiring Band C for all new tenancies by 2025 and all tenancies by 2028. Improving your rating now avoids rushed expensive works later.
Average EPC Ratings for London Properties
London's housing stock is older than the UK average — much of it Victorian and Edwardian terrace housing — which tends to score lower on EPC assessments. Typical EPC bands for London property types:
Modern flat (post-2000 build)B–C
1990s–2000s terraceC–D
1970s–1980s semi-detachedD–E
1960s–1970s flat/maisonetteD–E
Victorian/Edwardian terrace (pre-1919)E–F (without improvements)
Pre-1919 flatE–G (without improvements)
How to Improve Your EPC Band
The EPC report includes a list of recommended improvements ranked by cost-effectiveness. Common improvements that make the biggest difference:
- Loft insulation (100–270mm): typically moves a property up by 2–4 SAP points — cost £300–£600
- Cavity wall insulation: typically 3–5 SAP points — cost £400–£600
- New condensing boiler (from old G-rated boiler): typically 5–15 SAP points — cost £1,600–£2,500
- Double glazing (replacing single): typically 2–4 SAP points — cost £3,000–£8,000
- Solar PV panels (3–4kWp): typically 10–20 SAP points — cost £5,000–£8,000
- Heat pump (replacing gas boiler): typically 5–25 SAP points — cost £8,000–£15,000 (grants available)
Book Your EPC Today
Accredited DEAs. EPC from £79 inc VAT. Same-day available across London and M25. Understand your rating and what improvements will make the most difference.
📲 Book via WhatsAppFrequently Asked Questions — EPC Bands
What is the average EPC rating in London?
The average EPC rating for London properties is Band D (SAP score 55–68), reflecting the older housing stock in many inner-London areas. London's large proportion of Victorian and Edwardian properties tends to drag the average down.
Can I challenge my EPC rating?
Yes. If you believe your EPC rating is inaccurate — for example, if the assessor missed insulation measures or incorrectly recorded property features — you can request a reassessment or complaint through the assessor's accreditation scheme. Different assessors using the same data should produce the same or very similar results.
Does a new boiler always improve the EPC band?
Not necessarily — it depends on what the old boiler was. Replacing an old inefficient boiler (G or F rated) with a new A-rated condensing boiler will significantly improve the SAP score. If your existing boiler is already rated A, replacing it will have little or no effect on the EPC rating.