The gap in price per square metre between London homes in EPC band C or above and bands D–G comes mostly from the homes themselves: a C or above on the Energy Performance Certificate (EPC) in London is more often found in smaller flats, where the square metre costs more. Like for like on floor area, type, build period and year of sale, the premium shrinks to a couple of percent.
Why the gap shrinks
With no adjustments, the total price for C and above is actually 10.9% lower; adjusted for floor area it comes out at +7.2%, add the type and it's +1.0%, build period +4.1%, and year of sale gives the like-for-like figure. Districts tell a different story: in E14 a raw gap of +17% turns into −2.7%, in SW3 −7% becomes +6.2%. Of 230 postcode districts, the premium is distinguishable from zero in 32, the discount in 33, and in 165 there is no visible difference.
Your district and your certificate
Your district is in the table of districts on the page, and you can look up your home's certificate by postcode in Find an energy certificate. This shows a link between the band and HM Land Registry sales up to 30 September 2026, not a cause and not a valuation of your home.