CM18 or CM21?
Two neighbouring postcode districts compared on sold prices, energy, flood risk, crime and deprivation, all from the same official sources as every report on this site.
Figures gathered 17 September 2026.
- Homes sell for about 27% less in CM18 than in CM21.
- CM21 recorded fewer crimes in the same period, though busier places always record more.
- CM21 is the less deprived of the two on the Index of Multiple Deprivation.
|
CM18
Harlow
|
CM21
East Hertfordshire
|
|
|---|---|---|
| Median home sale nearby | £310,000
from 92 sales |
£426,000
from 101 sales |
| Average sold price | £459,237 | £337,040 |
| Area price growth (YoY) | +4.4% (Harlow) | +3.7% (East Hertfordshire) |
| Dwelling type | Mid-terrace house | Detached house |
| Floor area | 66 m² | 174 m² |
| Built | Before 1900 | 1967–1975 |
| Energy rating | C | C |
| Heating cost (EPC est.) | £652/yr | £1232/yr |
| Schools likely to admit |
2 likely, 1 borderline of 8 with a figure
William Martin Church of England Junior School, Sir Frederick Gibberd College |
6 likely of 8 with a figure
Fawbert and Barnard Infants' School, Mandeville Primary School, Leventhorpe, High Wych Church of England Primary School |
| Flood zone | Zone 1 (low probability) | Zone 1 (low probability) |
| Crime nearby | 429 recorded | 56 recorded |
| Deprivation decile | 5 of 10 | 9 of 10 |
Common questions
Is CM18 or CM21 cheaper?
CM18 is the cheaper of the two. Homes around CM18 sell for about £310,000 and around CM21 for about £426,000, from HM Land Registry records of what actually changed hands.
Which has less crime, CM18 or CM21?
CM21 recorded fewer crimes in the same period (429 in CM18 against 56 in CM21, Police.uk). Busier places record more, so read this alongside how built-up each area is rather than on its own.
Is CM18 or CM21 the more affluent area?
On the Index of Multiple Deprivation, CM18 sits in decile 5 of 10 and CM21 in decile 9, where 10 is the least deprived.
Should I buy in CM18 or CM21?
That depends on what you need, and no dataset answers it. What this page gives you is the evidence side by side: what homes actually sell for, the energy ratings, the flood zone, recorded crime and deprivation, each traced to the body that published it.
A quick side-by-side snapshot only. Open each property's full report for the complete picture.