Are you a property professional?Get qualified leads from motivated homeowners.
Get startedAre you a property professional?Get qualified leads from motivated homeowners.
Get startedHarwyn is a semi-detached house in Harrow (HA3 0DW). It has a recorded floor area of 33 m² (around 355 sq ft), construction records dating it to 2012 onwards and council tax band G. The latest certificate (March 2025) shows a C (score 72). When first surveyed in June 2015 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Poor to Very Good. The recommended improvements would push it to B (score 91).
At 33 m² it sits well below the postcode median (136 m² across 5 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the top 10% of properties in this postcode. 2 planning records sit against the property, 1 approved, 1 refused. Past consents include an extension, a garage conversion and a porch, meaningful when judging how the property has evolved.
Harwyn ranks among the most efficient homes in the postcode for energy use.
Extension: Single storey
Conversion of garage into habitable room to include replacement of garage door with window, erection of a front porch and single storey side to rear extension to bungalow.
Harwyn has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£796,000
Modelled from EPC, postcode comparables.
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Everything we know about this property, compiled into one in-depth, downloadable report.
Detailed AI analysis
Harwyn outperforms the street on epc rating by a wide margin.
EPC Rating
72 (C)
Street avg 52 (E)
Floor Area
33 m²
Street avg 135 m²
CO₂ Emissions
1.4 t/year
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Leonards Avenue — bus stop.

Daytime· 07:00 – 23:00
51.4dB

Changes detected from historical EPC data
Changed to a more efficient fuel source
Heating controls changed
Window efficiency improved
Cavity wall insulation installed
Roof insulation improved
Floor insulation added or improved
Are we missing something? Tell us about home improvements to help adjust your valuation.
Extension: Two storey
erection of front porch and addition of second storey to existing bungalow to form two storey dwellinghousehouse
Median price across the last 5 sales in HA3 0DW: £382,000 (2010–1999).
An AI-written breakdown of everything that matters
Detailed EPC data
Full energy ratings, history and recommendations
Related properties
Comparable homes and street-level pricing
Full planning history
Every application and decision on record
Ad-free · Instant access · Secure Stripe checkout · One-off payment
Street avg 6.6 t/year
Habitable Rooms
1 rooms
Street avg 5 rooms
HA3 0SB
Closest school
0.4 km
St Gregory's Catholic Science College. 51 schools nearby.
Night-time· 23:00 – 07:00
41.1dB