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Get started90 Northwick Avenue is a one-bedroom semi-detached house in Harrow (HA3 0AT). It has a recorded floor area of 110 m² (around 1184 sq ft), construction records dating it to 1900-1929 and council tax band E. The latest certificate (May 2023) shows an E (score 39), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 77), a 2-band jump.
At 110 m² the property is well over the postcode median (55 m² across 52 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. One planning record on file: an extension approved in 2024. Past consents include an extension, a loft conversion and a garage conversion, meaningful when judging how the property has evolved. Today's modelled estimate of £693,000 is 17.5% above the 2024 sale price. On a £-per-square-foot basis, the last sale (£498/sq ft) was about 80.1% above the typical sold price in the postcode. Most recent transfer: March 2024 at £590,000.
90 Northwick Avenue sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
Extension: Single storey · Side and rear of property
Proposed demolition of patio, conversion of garage into habitable room, with the replacement of garage door with window, erection of single storey side to rear extension, first floor side extension, hip to gable end roof extension, rear dormer extension and installation of 2x front roof lights (Revised Description)
90 Northwick Avenue valuation sits well clear of the typical sold price in this postcode.
£693,000
Modelled from EPC, postcode comparables.
£590,000
Recorded with HM Land Registry.
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EPC Rating for 90 Northwick Avenue lags the street by a wide margin.
Price per m²
£5,364
Street avg £4,085
Floor Area
110 m²
Street avg 128 m²
Habitable Rooms
5 rooms
Street avg 6 rooms
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Northwick Park Underground Station — subway entrance.

Daytime· 07:00 – 23:00
49.1dB

6 March 2024Most recent
£590,000
Median price across the last 5 sales in HA3 0AT: £292,500 (2025–2020).
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Full planning history
Every application and decision on record
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CO₂ Emissions
8.3 t/year
Street avg 5.9 t/year
HA3 0AX
Closest school
0.9 km
Harrow High School. 41 schools nearby.
Night-time· 23:00 – 07:00
39.4dB