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Get started15 Courtenay Avenue is a semi-detached house in Harrow (HA3 5JH). It has a recorded floor area of 106 m² (around 1141 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (August 2025) shows a D (score 60), on the cusp of jumping into the C band. When first surveyed in March 2015 the rating was E, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good; while roof efficiency dropped from Average to Very Poor and lighting dropped from Very Good to Good. The recommended improvements would lift it to B (score 84), a 2-band jump.
Sale prices here have outpaced Harrow HPI: 3.3% per year against 0% for the wider region. Today's modelled estimate of £485,000 sits 51.6% above the 2015 sale of £320,000. On a £-per-square-foot basis, the last sale (£280/sq ft) was about 36.7% above the typical sold price in the postcode. One planning record on file: an extension approved in 2016. Past consents include an extension and subdivision, meaningful when judging how the property has evolved. At 106 m² it's 26.7% larger than the typical home in the postcode (84 m² median across 16 EPCs). 11 years since the last transfer (November 2015).
Recommended upgrades on file would lift this property by multiple EPC bands.
Council records show a subdivision application — the property's legal arrangement has been altered.
Extension: Side and rear of property
Latest sale on 15 Courtenay Avenue was the highest on Land Registry record across the postcode.
£485,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.3% per year over 13 years.
£320,000
Growth on file: 3.3% per year over 13 years.
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Detailed AI analysis
On price per m², 15 Courtenay Avenue stands well clear of the street.
Price per m²
£3,019
Street avg £1,667
Floor Area
106 m²
Street avg 88 m²
Habitable Rooms
6 rooms
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.0 km
Long Elmes — bus stop.

Daytime· 07:00 – 23:00
50.8dB

Changes detected from historical EPC data
Hot water system changed
Low energy lighting percentage decreased
Hot water system upgraded
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
Conversion of dwellinghouse to two flats; single storey side and rear extension; rear dormer; three rooflights in front roofslope;separate amenity space; boundary treatment; landscaping; bin / cycle storage and external alterations (part demolition of sid
5 November 2015Most recent
£320,000
+39.1%over 10 years24 February 2005
£230,000
+10.0%over 2 years28 November 2002
£209,000
Median price across the last 5 sales in HA3 5JH: £220,000 (2010–1998).
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Every application and decision on record
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Street avg 4 rooms
CO₂ Emissions
4.4 t/year
Street avg 3.6 t/year
Closest school
0.3 km
St Teresa's Catholic Primary School and Nursery. 27 schools nearby.
Night-time· 23:00 – 07:00
39.5dB