21 Claystones, Northampton, NN4 9UY
About 21 Claystones
21 Claystones is a detached house in Northampton (NN4 9UY). It has a recorded floor area of 161 m² (around 1733 sq ft), construction records dating it to 1983-1990 and council tax band E. The latest certificate (October 2015) shows a C (score 73). The recommended improvements would push it to B (score 82). The latest certificate is from October 2015, so improvements made since then won't be reflected.
Held since April 2000 — that's 26 years off the open market, well above the local norm. At 161 m² the property is well over the postcode median (105 m² across 17 EPCs), placing it in the larger end of the local stock. Across 1996–2000, sale prices on this property compounded at -8.2% per year. Today's modelled estimate of £439,000 sits 656.9% above the 2000 sale of £58,000. On a £-per-square-foot basis, the last sale (£33/sq ft) was about 81.6% below the postcode norm.
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Energy performance
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 12 Oct 2025
EPC Rating
Certificate validity
Expired on 12 October 2025
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Planning history
21 Claystones has no planning applications on record.
A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.
Sales history & valuation
21 Claystones's modelled value sits at over four times its earliest registered sale price (1996).
£439,000
Modelled from EPC, postcode comparables and a sale-price growth of -8.2% per year over 4 years.
£58,000
Growth on file: -8.2% per year over 4 years.
Sales timeline
5 April 2000Most recent
£58,000
-29.3%over 4 years21 March 1996
£82,000
Median price across the last 5 sales in NN4 9UY: £345,000 (2025–2022).
Nearby sales in NN4 9UY
Versus other Claystones homes
On price per m², 21 Claystones runs well behind the street norm.
Price per m²
£360
Street avg £2,962
Floor Area
161 m²
Street avg 113 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
4.8 t/year
Street avg 4.7 t/year
Everything you need to know about 21 Claystones
The true value, the hidden risks and the full sale history, in one report.
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Similar properties nearby
The neighbourhood at a glance
Crime
339/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
Ladymead Close — bus stop.
Closest school
0.9 km
Hunsbury Park Primary School. 18 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
56.1dB
Night-time· 23:00 – 07:00
46.8dB