Rental vs Owner-Occupied: The EPC Compliance Gap
We analysed 75,000 EPC certificates across 15 UK local authorities. The results challenge everything you thought you knew about who's failing to meet energy standards.
of private rentals fail the 2030 EPC standard
of owner-occupied homes fail the 2030 EPC standard
Owner-occupied homes perform worse overall than private rentals on EPC ratings - but face zero regulatory pressure to improve. Meanwhile, renters have no power to upgrade the homes they live in.
33.8%
Private rentals below C
6,441 properties
39.4%
Owner-occupied below C
11,965 properties
23.1%
Social housing below C
Best performing tenure
42%
More likely: uninsulated walls
Private rental vs owner-occ
Key Finding
The compliance gap is not what you expected
Conventional wisdom says private landlords are failing their tenants on energy efficiency. The data tells a more complicated story.
Owner-occupied homes have a higher below-C rate (39.4%) than private rentals (33.8%). But they face zero legal obligation to improve.
MEES regulations have forced private landlords to upgrade the worst properties to at least EPC E. No equivalent pressure exists for owner-occupiers.
For flats - which make up 51% of all private rentals - renters ARE measurably worse off. Rental flats: 27.6% below C. Owner flats: 22.3% below C. A 5.3pp gap.
Same property type, same building structures. Different incentives to improve.
Private renters are 42% more likely to have uninsulated solid walls in their homes (36.9% vs 26.0% for owner-occupied). Their landlords do not pay the energy bills.
Solid wall insulation costs £8,000-£20,000. If you do not pay the bills, there is no financial incentive to install it.
Social housing is the unsung success story. Just 23.1% of social rental homes fail EPC C - 10.7 percentage points better than private rental, and 16.3 points better than owner-occupied.
Decades of investment in social housing stock show that large-scale retrofit works.
Head-to-head comparison
All three tenure types, on every key metric. Red = worse, green = better.
19,053 properties
30,346 properties
C (70)
Avg EPC band
C (70)
33.8%
better% below EPC C
39.4%
worse£731
betterAvg heating cost / year
£906
worse2.2t CO2
betterAvg CO2 emissions
2.9t CO2
worse36.9%
worseSolid wall uninsulated
26.0%
better73 m2
worseAvg floor area
90 m2
betterWhy do owner-occupied homes have higher costs and emissions? Owner-occupied homes in our sample are 24% larger on average (90 m2 vs 73 m2). More floor area means more energy to heat. The EPC score is similar for both tenures - but bigger homes cost more to run in absolute terms.
Social housing: the benchmark others should aspire to
Private rental
below EPC C
Owner-occupied
below EPC C
Social housing
below EPC C
The insulation scandal: who pays when landlords do not upgrade?
Solid wall insulation is expensive. For a Victorian terrace it can cost between £8,000 and £20,000. If you live in a rental, your landlord decides whether to pay for it. You pay the consequences through your energy bill every month.
Our data shows 36.9% of private rental homes have uninsulated solid walls, compared with 26.0% of owner-occupied. Private renters are 42% more likely to be living in an under-insulated home - through no choice of their own.
42% more likely
Private renters are 42% more likely to live with uninsulated solid walls than owner-occupiers
27.6% vs 22.3%
For flats specifically - the most common rental property type - private tenants have a 5.3pp higher failure rate than owner-occupiers in identical property types
The incentive gap
Landlords own the asset. Tenants pay the bills. This creates a structural incentive to under-invest in energy efficiency. The result is visible in the data: private renters disproportionately bear the cost of homes their landlords have not upgraded.
Where is the rental gap worst?
Local authorities ranked by the gap between private rental and owner-occupied below-C rates. Positive = rentals are worse. Negative = owner-occupied are worse.
Manchester
Rental: 30.3% below C | Owner: 19.7% below C
rental worse
Durham
Rental: 35.0% below C | Owner: 30.5% below C
rental worse
Birmingham
Rental: 53.6% below C | Owner: 50.9% below C
rental worse
Derby
Rental: 47.8% below C | Owner: 47.5% below C
rental worse
Westminster
Rental: 26.5% below C | Owner: 26.3% below C
rental worse
Hackney
Rental: 22.8% below C | Owner: 24.6% below C
owner worse
Brent
Rental: 32.9% below C | Owner: 36.3% below C
owner worse
Peterborough
Rental: 34.6% below C | Owner: 38.6% below C
owner worse
Manchester: the sharpest rental gap in our analysis
In Manchester, private rentals have a 30.3% below-C rate versus 19.7% for owner-occupied - a gap of 10.6 percentage points. In cities like this, the tenure gap is very real for renters.
By property type: where is the gap concentrated?
Comparing the same property types across tenures removes the distortion of different housing stock compositions. The picture changes.
Flat
9,647 rentals / 8,886 owned
Renters in flats are worse off
Maisonette
758 rentals / 844 owned
Owners in maisonettes are worse off
House
8,332 rentals / 18,988 owned
Owners in houses are worse off
Bungalow
316 rentals / 1,624 owned
Owners in bungalows are worse off
The flat paradox
Flats should be the easiest property type to heat efficiently - shared walls, smaller floor areas, and less exposure to the elements. Yet private rental flats have a 5.3pp higher failure rate than owner-occupied flats. The difference is entirely attributable to landlord investment decisions, not property characteristics.
By construction era: Victorian vs modern
The age of a property is the strongest predictor of energy performance. But across every era, the story of who is worse off differs.
| Construction era | Private rental below C | Owner-occ below C | Gap |
|---|---|---|---|
| Victorian (pre-1900) | 48.9% | 62.8%worse | 13.9pp |
| Edwardian (1900-1929) | 44.2% | 54.5%worse | 10.3pp |
| Inter-war (1930-1949) | 42.2% | 55.1%worse | 12.9pp |
| Post-war (1950-1966) | 37.5% | 44.3%worse | 6.8pp |
| Early 70s (1967-1975) | 31.9% | 45.9%worse | 14.0pp |
| Late 70s (1976-1982) | 21.9% | 31.1%worse | 9.2pp |
| 1980s (1983-1990) | 26.8% | 31.8%worse | 5.0pp |
| Early 90s (1991-1995) | 27.9% | 28.4% | 0.5pp |
| Late 90s (1996-2002) | 19.4%worse | 17.5% | 1.9pp |
| 2000s (2003-2006) | 7.6% | 7.1% | 0.5pp |
| 2007-2011 | 5.4% | 5.5% | 0.1pp |
| 2023 onwards | 6.1% | 7.9%worse | 1.8pp |
| 2012-2021 | 5.3% | 4.9% | 0.4pp |
| 2022 onwards | 4.5% | 10.5%worse | 6.0pp |
| 2012 onwards | 1.0% | 1.7%worse | 0.7pp |
Victorian housing: the worst for everyone
48.9%
Private rental
62.8%
Owner-occupied
In Victorian properties (pre-1900), owner-occupiers actually perform 13.9 percentage points worse than private renters. Even with regulatory pressure from MEES, Victorian rentals have a 48.9% failure rate - showing how hard solid-wall Victorian properties are to retrofit.
Modern housing: the problem effectively solved
5.4%
Private rental
5.5%
Owner-occupied
Homes built to modern building regulations (2007-2011) achieve near-identical compliance rates regardless of tenure. The EPC crisis is fundamentally a problem of old housing stock - not of landlord behaviour alone.
The policy gap: why owner-occupied homes escape scrutiny
MEES (Minimum Energy Efficiency Standards) requires private rental properties to achieve at least EPC E. By 2030, the government proposes raising that to EPC C. This applies only to properties that are rented out.
Owner-occupied homes face no such requirements. They can sit at EPC G indefinitely. Our data reveals what this means in practice.
11,965
owner-occupied homes in our sample
would fail the 2030 EPC C standard
39.4%
of owner-occupied homes
would be illegal to let under MEES
1.5%
would fail even the current
minimum standard (EPC E)
Current MEES rules (EPC E minimum)
Private landlords must ensure rental properties meet EPC E before letting. Landlords who let properties below this threshold face fines of up to £30,000. Owner-occupiers are completely exempt - even if their home is rated G.
Proposed 2030 rules (EPC C minimum for rentals)
The government proposes requiring all new tenancies to meet EPC C by 2030, existing tenancies by 2030. Based on our sample, 33.8% of private rentals currently fail this standard. But 39.4% of owner-occupied homes also fail it - and there is no equivalent proposal for them.
The regulatory blind spot: 11,965 "would-be illegal" owner-occupied homes
In our sample of 30,346 owner-occupied properties, 11,965 - a full 39.4% - would be illegal to rent under the proposed 2030 standard. These homes generate carbon emissions, burden their occupants with high energy bills, and receive no regulatory attention. The EPC crisis is not just a landlord problem.
Key findings - share these
The Flat Compliance Gap
+5.3pp
Private rental flats are 5.3 percentage points more likely to be below EPC C than owner-occupied flats. Same property type. Different landlord incentives.
The Insulation Scandal
42% more
Private renters are 42% more likely to live with uninsulated solid walls than owner-occupiers. The split incentive at work.
The Hidden Compliance Crisis
39.4%
39.4% of owner-occupied homes would fail the 2030 EPC C standard - but face zero legal pressure to improve. 11,965 homes in our sample alone.
Download the data
The full dataset is available to download. This includes all per-tenure, per-LA, per-property-type, and per-age-band breakdowns in JSON format.