Flat 1, 7 Castilian Street, Northampton, NN1 1JS
About Flat 1
Flat 1 is a one-bedroom mid-terrace house in Northampton (NN1 1JS). It has a recorded floor area of 45 m² (around 484 sq ft) and construction records dating it to 1900-1929. The latest certificate (December 2020) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in December 2017 the rating was F, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Good, window efficiency went from Very Poor to Average and main heating went from Very Poor to Poor. Main heating runs on electricity.
Today's modelled estimate of £137,000 is 14.2% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£248/sq ft) was about 80.5% above the typical sold price in the postcode. Last sold in May 2015, so it's been off the market for around 11 years. At 45 m² it's 21.1% smaller than the typical home in the postcode (57 m² median across 13 EPCs).
What this property has
Inside
- Bedrooms1
- Bathrooms1
- Open-plan layoutYes
- FireplaceYes
Outside
- Private gardenYes
Building
- RefurbishedYes
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
Energy performance
EPC Rating
Certificate validity
Valid until 10 December 2030
Property Improvements
Changes detected from historical EPC data
Heat pump installed, significantly improving energy efficiency
Heating controls changed
Single glazing replaced with double or better glazing
Wall insulation improved
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919 and has no mains gas supply, we believe a Level 3 building survey should be considered.
From £820 · Includes VAT
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
Flat 1 valuation runs notably under the typical sold price in this postcode.
£137,000
Modelled from EPC, postcode comparables.
£120,000
Recorded with HM Land Registry.
Sales timeline
25 May 2015Most recent
£120,000
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
£330,000Flat 1, 9 Castilian Street, Northampton, NN1 1JS
Sold Mar 2025
£225,0005 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
£113,500
Versus other Castilian Street homes
Flat 1 outperforms the street on years held by a wide margin.
Price per m²
£2,667
Street avg £2,695
Floor Area
45 m²
Street avg 54 m²
Habitable Rooms
2 rooms
Street avg 2 rooms
CO₂ Emissions
2.1 t/year
Street avg 2.2 t/year
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
Similar properties nearby
10 Saxon Court, Flat 2, St Peters Street
NN1 1FD
16 20, Flat 1, Gold Street
NN1 1RT
16 20, Flat 2, Gold Street
NN1 1RT
16 20, Flat 4, Gold Street
NN1 1RT
14 Saxon Court, Flat 2, St Peters Street
NN1 1FD
14 Saxon Court, Flat 4, St Peters Street
NN1 1FD
16 20, Flat 5, Gold Street
NN1 1RT
10 Saxon Court, Flat 1, St Peters Street
NN1 1FD
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