4a, Castilian Street, Northampton, NN1 1JX
About 4a
4a is a mid-terrace house in Northampton (NN1 1JX). It has a recorded floor area of 38 m² (around 409 sq ft), construction records dating it to 1900-1929 and council tax band A. At 38 m² this is the smallest unit on EPC record across the building (38–66 m²). The latest certificate (January 2024) shows a C (score 77), near the top of the C band. When first surveyed in January 2014 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency dropped from Very Good to Good.
At 38 m² it's 23.2% smaller than the typical home in the postcode (50 m² median across 16 EPCs).
Everything you need to know about 4a
The true value, the hidden risks and the full sale history, in one report.
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The data behind every report
Energy performance
4a's carbon output is low for the local stock.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919 and has solid (non-cavity) walls, we believe a Level 3 building survey should be considered.
From £820 · Includes VAT
Planning history
4a has no planning applications on record.
But the area is active
45 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
4a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£128,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Versus other Castilian Street homes
4a outperforms the street on co₂ emissions by a wide margin.
EPC Rating
77 (C)
Street avg 73 (C)
Floor Area
38 m²
Street avg 50 m²
CO₂ Emissions
1.1 t/year
Street avg 1.7 t/year
Habitable Rooms
2 rooms
Street avg 2 rooms
Everything you need to know about 4a
The true value, the hidden risks and the full sale history, in one report.
Pick your report · every report is £14.99
One time fee only - money back guarantee
The data behind every report
Similar properties nearby
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
11/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Post Office — bus stop.
Closest school
0.8 km
Spring Lane Primary School. 31 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
56.6dB
Night-time· 23:00 – 07:00
47.3dB