12a, Cathedral Walk, Chelmsford, CM1 1NX
About 12a
12a is a semi-detached house in Chelmsford (CM1 1NX). It has a recorded floor area of 51 m² (around 549 sq ft). At 51 m² this is the 18th smallest of 19 units on EPC record in the building, where floor areas span 41–52 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (June 2017) shows a D (score 62), on the cusp of jumping into the C band. Main heating runs on electricity: electricity, unspecified tariff.
A recent sale: £200,000 in January 2026. At 51 m² it's 18.6% larger than the typical home in the postcode (43 m² median across 18 EPCs). Across 2018–2026, sale prices on this property compounded at -3% per year. On a £-per-square-foot basis, the last sale (£364/sq ft) was about 21.3% above the typical sold price in the postcode.
Energy performance
EPC Rating
Certificate validity
Valid until 12 June 2027
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Planning history
12a has no planning applications on record.
But the area is active
3 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
12a saw 3 transfers in just over a decade — high turnover for the postcode.
£209,000
Modelled from EPC, postcode comparables and a sale-price growth of -3.0% per year over 8 years.
£200,000
Growth on file: -3.0% per year over 8 years.
Sales timeline
16 January 2026Most recent
£200,000
-8.3%over 3 years28 July 2022
£218,000
-14.5%over 4 years9 February 2018
£255,000
Median price across the last 5 sales in CM1 1NX: £190,000 (2026–2021).
Nearby sales in CM1 1NX
Versus other Cathedral Walk homes
12a is notably below the street on years held.
Price per m²
£3,922
Street avg £3,478
Floor Area
51 m²
Street avg 43 m²
CO₂ Emissions
2.2 t/year
Street avg 2.2 t/year
Years Held
1 years
Street avg 14 years
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
420/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Careers Office — bus stop.
Closest school
0.3 km
The Cathedral Church of England Voluntary Aided Primary School, Chelmsford. 33 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
55.1dB

Night-time· 23:00 – 07:00
46.2dB







