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Get started23 Cosmo Avenue is a six-bedroom end-of-terrace house in York (YO31 0SU). It has a recorded floor area of 125 m² (around 1345 sq ft), construction records dating it to 1930-1949 and council tax band B. Tenure is freehold. The latest certificate (January 2019) shows a C (score 74). The rating has held steady at C across 2 certificates since December 2008. Between certificates, lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Average. The recommended improvements would push it to B (score 84).
Held since April 2004 — that's 22 years off the open market, well above the local norm. Sale prices here have outpaced York HPI: 17.7% per year against 0% for the wider region. Today's modelled estimate of £341,000 sits 199.1% above the 2004 sale of £114,000. On a £-per-square-foot basis, the last sale (£85/sq ft) was about 45.6% below the postcode norm. At 125 m² the property is well over the postcode median (79 m² across 15 EPCs), placing it in the larger end of the local stock. 6 bedrooms is on the larger side for this postcode, where 4 is the typical count. 2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved.
23 Cosmo Avenue has 2 separate extension applications on the council record.
Extension: Single storey · Side of property
Single storey pitched roof side extension (revised scheme)
23 Cosmo Avenue has more than doubled in price since the earliest registered sale in 1999.
£341,000
Modelled from EPC, postcode comparables and a sale-price growth of 17.7% per year over 5 years.
£114,000
Growth on file: 17.7% per year over 5 years.
On price per m², 23 Cosmo Avenue runs well behind the street norm.
Price per m²
£912
Street avg £2,146
Floor Area
125 m²
Street avg 88 m²
Habitable Rooms
7 rooms
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Eighth Avenue Playing Fields — bus stop.

Daytime· 07:00 – 23:00
49.3dB

Changes detected from historical EPC data
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
Extension: Single storey · Side of property
Erection of single storey pitched roof side extension
6 April 2004Most recent
£114,000
+123.7%over 4 years27 April 1999
£50,950
Median price across the last 5 sales in YO31 0SU: £255,000 (2025–2021).
Street avg 5 rooms
CO₂ Emissions
3.6 t/year
Street avg 3.5 t/year
YO31 0PZ
Closest school
0.4 km
Tang Hall Primary Academy. 24 schools nearby.
Night-time· 23:00 – 07:00
38.2dB
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