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 £144,000 is 20% 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.
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The data behind every report
Energy performance
EPC Rating
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
45 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
£144,000
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: £225,000 (2025–2016).
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 · every report is £14.99
One time fee only - money back guarantee
The data behind every report
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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. 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