Flat 1, 9 Castilian Street, Northampton, NN1 1JS
About Flat 1
Flat 1 is a mid-terrace house in Northampton (NN1 1JS). It has a recorded floor area of 62 m² (around 667 sq ft). At 62 m² this is the largest unit on EPC record across the building (29–62 m²). The latest certificate (January 2021) shows a C (score 74).
Today's modelled estimate of £173,000 is 23.1% below the 2025 sale of £225,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£337/sq ft) was about 145.6% above the typical sold price in the postcode. It changed hands recently, sold March 2025 for £225,000.
Everything you need to know about Flat 1
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
EPC Rating
Certificate validity
Valid until 8 January 2031
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Planning history
Flat 1 has no planning applications on record.
But the area is active
43 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
£173,000
Modelled from EPC, postcode comparables.
£225,000
Recorded with HM Land Registry.
Sales timeline
14 March 2025Most recent
£225,000
Median price across the last 5 sales in NN1 1JS: £249,995 (2026–2016).
Nearby sales in NN1 1JS
Flat, 21 Castilian Street, Northampton, NN1 1JS
Sold Apr 2026
£330,0005 Castilian Street, Northampton, NN1 1JS
Sold Dec 2017
£285,000Flat 2, 7 Castilian Street, Northampton, NN1 1JS
Sold Jun 2017
£99,450Flat 3, 7 Castilian Street, Northampton, NN1 1JS
Sold Mar 2016
£113,500Flat 1, 7 Castilian Street, Northampton, NN1 1JS
Sold May 2015
£120,000
Versus other Castilian Street homes
On price per m², Flat 1 stands well clear of the street.
Price per m²
£3,629
Street avg £2,374
Floor Area
62 m²
Street avg 53 m²
CO₂ Emissions
1.7 t/year
Street avg 2.3 t/year
Years Held
1 years
Street avg 10 years
Everything you need to know about Flat 1
The true value, the hidden risks and the full sale history, in one report.
Pick your report · from £14.99
One time fee only - money back guarantee
The data behind every report
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The neighbourhood at a glance
Crime
571/mo
Steady 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. 32 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
57.0dB
Night-time· 23:00 – 07:00
47.6dB