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Flat 1, 7 Castilian Street, Northampton, NN1 1JS

Estimated value

£137,000

  • Since the 2015 sale (£120,000)+14%
  • Against NN1 1JS's recent median (£249,995)-45%

Newest record on this page: April 2026. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.

Learn about this valuation
Property type
Mid terrace
Floor 02
Bedroom
1
Bathroom
1
Floor area
45 m²
484 sq ft
Energy rating
D
Score 65
Tenure
Private Rental
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Valuation

About this valuation

How the figure is worked out and what it's based on. If you know this home, you can tell other visitors what you think it's worth.

Our estimate

£137,000

  • Against its 2015 sale (£120,000)+14%
  • Against NN1 1JS's recent median (£249,995)-45%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for Flat 1 is modelled from its 45 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in NN1 1JS. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.

What it's based on

  • Floor area

    45 m² from the EPC lodged in December 2020

  • Sales of this home

    1 sale recorded, the latest in 2015

  • Recent sales in NN1 1JS

    5 sales, median £249,995 (2026–2016)

This page or the full report?

DataThis pageFull report
SalesLatest sale shown: April 2026Latest available records, read when you order
ValuationEstimate from the last refreshAnalysed against comparable sales
PlanningNone on this homeFull history, plus nearby schemes
Flood riskNot shownIncluded
Price

Sales history & valuation

Every recorded sale of this home, how its price has moved, and what neighbouring properties have sold for.

Flat 1 valuation runs notably under the typical sold price in this postcode.

Sales timeline

  1. 25 May 2015Most recent

    £120,000

Median price across the last 5 sales in NN1 1JS: £249,995 (2026–2016).

Risks

What this page doesn't show

2 potential issues have already been flagged for Flat 1, 7 Castilian Street, Northampton, NN1 1JS. The detail, evidence and what to ask about it are in the Risks Report.
  • Signs of HMO activity in the areaIn report
  • Larger development activity nearbyIn report
  • Flood risk from rivers, sea and surface waterIn report
  • Subsidence and ground-stability signalsIn report
  • Refusals, enforcement and big schemes nearbyIn report

One time fee only - money back guarantee

Overview

About Flat 1

A plain-English summary derived from public records, EPC certificates, sold prices and local data.

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).

Specifications

What this property has

Pulled from EPC certificates, claim submissions and our property model. Empty categories are hidden — we only show what's known.

Inside

  • Bedrooms1
  • Bathrooms1
  • Open-plan layoutYes
  • FireplaceYes

Outside

  • Private gardenYes

Building

  • RefurbishedYes
Before you decide

Everything you need to know about Flat 1

The true value, the hidden risks and the full sale history, in one report.

Signs of HMO activity in the areaLarger development activity nearby

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Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Energy

Energy performance

Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.
Current Certificate(1 of 3)
Dec 2020

EPC Rating

A
B
C
D
D65
E
F
G
Main Heating
Heat Pump
Main Fuel
Electric
Hot Water
Very Poor
Windows
Average
CO2 Emissions
2.1 t/year
Occupancy
Rented

Certificate validity

Valid until 10 December 2030

4 years remaining

Property Improvements

Changes detected from historical EPC data

Dec 2020from Dec 2017
EPC improved fromF34toD55
Heating System
Room HeatersHeat Pump

Heat pump installed, significantly improving energy efficiency

Heating Controls
Prog + StatThermostat

Heating controls changed

Windows
SingleFull Double

Single glazing replaced with double or better glazing

Walls
Very PoorGood

Wall insulation improved

Planning

Planning history

Applications and permits filed against Flat 1, 7 Castilian Street, Northampton, NN1 1JS, sourced from the PlanIt planning register.

Flat 1 has no planning applications on record.

43

But the area is active

43 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.

On the street

Versus other Castilian Street homes

Four headline reads against 13 similar flats on this street, drawn from the latest EPC and Land Registry data.

Flat 1 outperforms the street on years held by a wide margin.

Price per m²

£2,667

Street avg £2,695

Above

Floor Area

45 m²

Street avg 54 m²

Below

Habitable Rooms

2 rooms

Street avg 2 rooms

On par

CO₂ Emissions

2.1 t/year

Street avg 2.2 t/year

Below
Area

The neighbourhood at a glance

A condensed read of the local area. Each tile links through to the full breakdown on the Northampton district page.
Full Northampton report

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.

Nearest schools

  • Spring Lane Primary SchoolPrimary806m
  • Castle AcademyPrimary821m
  • Vernon Terrace Primary SchoolPrimary902m
  • Northampton International AcademyAll-through985m

Nearest stops

  • Post OfficeBus stop55m
  • Derngate CentreBus stop72m
  • Mercers RowBus stop239m
  • Northampton Bus InterchangeBus stop324m

Most reported crime locally

  • Violence & Sexual Offences2,940 reports32%
  • Anti-social Behaviour1,893 reports21%
  • Shoplifting785 reports9%
  • Public Order622 reports7%

Go deeper on the local area

A Local Area report breaks down crime, transport links, schools and air quality in depth.

Noise

Road noise across the postcode

Modelled day and night-time noise levels around NN1 1JS from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime road noise heatmap for NN1 1JS

Daytime· 07:00 – 23:00

57.0dB

Moderate
Night-time road noise heatmap for NN1 1JS

Night-time· 23:00 – 07:00

47.6dB

Low
55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4
SDL Surveying

Get a survey for this property

Level 3 Building Survey

Victorian-era2nd Floor FlatEPC DPre-1919 buildNo mains gas

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

Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£137k

10 Saxon Court, Flat 2, St Peters Street

NN1 1FD

Flat
£138k

16 20, Flat 1, Gold Street

NN1 1RT

Flat
£139k

16 20, Flat 2, Gold Street

NN1 1RT

Flat
£139k

16 20, Flat 4, Gold Street

NN1 1RT

Flat
£135k

14 Saxon Court, Flat 2, St Peters Street

NN1 1FD

Flat
£134k

14 Saxon Court, Flat 4, St Peters Street

NN1 1FD

Flat
£141k

16 20, Flat 5, Gold Street

NN1 1RT

Flat
£142k

10 Saxon Court, Flat 1, St Peters Street

NN1 1FD

Flat

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Method

How to read this page

Where every figure above comes from, how current it is and what it can't tell you.
Valuation method in detail
How the estimate is made
The estimate for Flat 1 is modelled from its 45 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in NN1 1JS. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.
Where sold prices come from
Sold prices are HM Land Registry Price Paid Data, which covers residential sales in England and Wales since 1995. 1 sale is recorded for Flat 1. Sales normally appear two to three months after completion, so the most recent ones take time to show up anywhere.
Reading the EPC
Energy Performance Certificates rate homes from A (most efficient) to G and last 10 years. The latest one for Flat 1 was lodged in December 2020 at band D and is valid until December 2030. 3 certificates are on record, which shows how the home has changed.
Planning records
Planning applications are collected from local authority registers through PlanIt. None is matched to Flat 1. Councils sometimes file applications under a different address format, and applications on neighbouring land aren't listed here; the report covers both.
Area figures
Crime is police-recorded street-level data over the last 16 months, which places each incident at an approximate point. The 32 schools and 30 stops listed are measured in a straight line from NN1 1JS, not by walking route. Road noise is Defra's strategic noise modelling, averaged across the postcode.
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about Flat 1, 7 Castilian Street, Northampton, NN1 1JS. Each answer is also embedded as structured data for search engines.

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