The most recent energy certificate on a Nottingham flat is more than twice as likely to show a good rating in Clifton as in the city centre. Across the city, 60.1% of flats hold an energy rating of C or better — but that average hides a wide spread by postcode, from 37.0% in NG1 to 85.0% in NG11. The biggest single reason is not price or location: it is the age of the building the flat sits in.
Flats in blocks built since 2003 are rated C or better 94.7% of the time. For flats in buildings that pre-date 1930, the figure is just 13.2%. That 81-percentage-point gap runs straight through Nottingham's housing stock, and because different eras of building cluster in different parts of the city, it shows up clearly at postcode level.
The figures below come from the most recent Energy Performance Certificate held for each flat, matched to average house prices across Nottingham from HM Land Registry's record of what actually sold in 2025.
The build-era gap, in one table
| Flat's building era | Flats (share) | Rated C or better |
|---|---|---|
| Before 1930 | 448 (13.9%) | 13.2% |
| 1930–2002 | 1,999 (62.0%) | 57.4% |
| 2003 onwards | 737 (22.9%) | 94.7% |
Most recent EPC per flat address, Nottingham City (3,225 certificates in total; 41 flats, 1.3%, have no recorded build era).
City-wide, only 1.3% of Nottingham flats sit in the worst F or G bands — the older stock is concentrated in the D and E bands rather than at the very bottom. But the pattern is stark: a flat in a pre-1930 building is roughly seven times less likely to reach band C than one built this century.
Why older flats rate lower
Period buildings went up before modern insulation standards existed. Many have solid brick or stone walls that cannot take cavity-wall insulation, single-skin construction, and roofs or windows whose upgrades are limited by conservation rules — much of Nottingham's oldest flat stock is in and around the Lace Market, a conservation area. Flats built since 2003, by contrast, had to meet successive tightenings of the Building Regulations' energy rules, so they begin life with insulation, efficient glazing and modern heating already fitted. As gov.uk's guidance explains, an EPC rates a home's energy efficiency and estimated running costs on an A-to-G scale, and lower-rated homes typically cost more to heat.
One caveat worth stating plainly: an EPC records a building's age band, but not whether a flat is a purpose-built unit or a conversion of an older house. Because purpose-built blocks were rare before the 1930s, a pre-1930 flat is, in practice, almost always a conversion — which is why the national picture shows purpose-built flats consistently beating period conversions on EPC ratings.
Postcode by postcode
| Postcode | Main areas | Flats rated C+ | Built pre-1930 | Built 2003+ | Median flat sale, 2025 |
|---|---|---|---|---|---|
| NG11 | Clifton, Wilford | 85.0% | 0.0% | 56.5% | £177,000 |
| NG2 | The Meadows, Trent Bridge | 69.0% | 11.1% | 9.7% | £171,750 |
| NG5 | Sherwood, Basford | 68.3% | 6.3% | 35.2% | £115,000 |
| NG6 | Bulwell, Bestwood | 67.7% | 8.4% | 38.3% | — |
| NG3 | Sneinton, Mapperley | 52.7% | 13.3% | 19.2% | £149,000 |
| NG7 | Lenton, Radford, The Park | 51.0% | 21.1% | 10.1% | £157,500 |
| NG8 | Aspley, Bilborough | 47.0% | 2.7% | 5.4% | £116,500 |
| NG1 | City centre, Lace Market | 37.0% | 53.3% | 2.2% | £147,500 |
EPC shares are from the most recent certificate per flat address. Median flat sale is the 2025 Land Registry median for postcodes where at least 15 flats sold — NG6 had too few for a reliable figure. Sample sizes: NG1 72, NG2 34, NG3 56, NG5 51, NG7 90, NG8 18, NG11 29.
Two postcodes bookend the city. NG1 — the city centre and Lace Market — has the oldest flat stock, with 53.3% of its flats in pre-1930 buildings, the legacy of warehouse and townhouse conversions, and the lowest efficiency at 37.0% rated C or better. NG11, Clifton to the south of the Trent, is the mirror image: not one of its measured flats pre-dates 1930, more than half were built since 2003, and 85.0% rate C or better.
Price and efficiency do not move together. NG11 is both the most energy-efficient flat postcode and the dearest, with a 2025 median flat sale of £177,000. But NG5 (Sherwood and Basford) is the cheapest at £115,000 while still rating 68.3% C or better, and the mid-priced city-centre flats in NG1 (£147,500) are the least efficient in Nottingham. A buyer paying a city-centre premium for the location is, on average, buying a colder flat. NG7 — the university and student belt around Lenton and Radford — sits mid-table at 51.0%, weighed down by a high share (21.1%) of pre-1930 conversions.
What it means for the monthly cost
A flat's energy rating is one of three big recurring costs — alongside the mortgage and the council tax — and it is the one that varies most by postcode.
The typical Nottingham flat sold for £140,000 in 2025 and measures about 54 square metres. On a 25% deposit (£35,000) and a £105,000 mortgage at the Bank of England's average five-year fixed quoted rate of 4.32% — its most recent reading, for April 2026 — over 25 years, the repayment works out at roughly £573 a month. You can run different prices and deposits through the monthly mortgage cost calculator. Nottingham's 2026-27 council tax is £2,755.39 at Band D, one of the higher rates in England; most flats fall in the lowest bands, where Band A is £1,836.93 a year (£153 a month) and Band B £2,143.08 (£179). Mortgage plus council tax comes to about £726 a month for a Band A flat, before a penny of energy is spent.
Energy is where the EPC bites. An EPC estimates a home's energy costs, and homes in the lowest bands typically cost materially more to heat than those rated C or above — so two flats at a similar price can carry very different heating bills depending on which side of the build-era line they fall. We don't put a single pound figure on that gap here, because the modelled cost line on an EPC is not a reliable stand-in for a full annual bill; the band itself is the more dependable signal.
One cost the headline figures leave out: 97.7% of Nottingham's flats are leasehold, so most buyers also pay a service charge and, in some cases, ground rent — sums that vary widely by building and are not captured in the mortgage-and-council-tax total.
Stamp duty at these prices
At Nottingham flat prices, stamp duty is small or nil. A first-time buyer purchasing a main residence pays no Stamp Duty Land Tax below £300,000 (HMRC, 2026), so the entire local flat market is stamp-duty-free for them. A home mover pays 2% on the slice above £125,000 — £300 on a £140,000 flat, rising to £1,040 at £177,000. A buyer of an additional property, such as a second home or a buy-to-let, pays a 5% surcharge on the full price on top of that — £7,000 on a £140,000 flat. A conveyancer confirms which rate applies on completion.
Three caveats
The EPC figures use the most recent certificate on record for each flat, so a home improved since its last assessment may rate better than the data shows. Build era is a proxy for construction type, not a certainty — a handful of pre-1930 flats are purpose-built mansion blocks, and some post-2000 conversions exist. And the 2025 median prices for smaller postcodes such as NG8 (18 sales) and NG11 (29) rest on modest samples, so treat them as a guide rather than a precise market rate.
None of this is a valuation of any individual flat, or advice on what to buy — it is a read on how Nottingham's flat stock is distributed. Speak to a qualified adviser before acting.
See it for a specific address
To pull the mortgage at today's rate, the council tax band, the energy rating and the stamp duty together for a single address, search a postcode on Homecost. Try NG1 1AA in the city centre or NG11 8AA in Clifton, compare the wider region in our guide to buying and running a home across Nottingham, Derby and Leicester, or browse more location and area-planning guides.
Based on 3,225 current Energy Performance Certificates for Nottingham flats and HM Land Registry flat sales recorded in 2025 — see the full guide library.