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Get started171a is a mid-terrace house in London (SW17 0AL). It has a recorded floor area of 58 m² (around 624 sq ft), construction records dating it to 1900-1929 and council tax band C. At 58 m² this is the smallest unit on EPC record across the building (58–107 m²). The building's EPC ratings span D to C, with this unit at the top. The latest certificate (July 2018) shows a C (score 69), just inside the C band. When first surveyed in June 2015 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good; while window efficiency dropped from Average to Poor.
It hasn't traded since March 1997, a hold of 29 years that's notably long for the area. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £416,000 sits 663.3% above the 1997 sale of £54,500. On a £-per-square-foot basis, the last sale (£87/sq ft) was about 79.7% below the postcode norm. At 58 m² it sits well below the postcode median (90 m² across 27 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 89% of similar EPCs). 2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved.
Multiple extension applications run across more than a decade of planning history at 171a.
Extension: Single storey · Side and rear of property
Erection of single storey rear and side extension.
171a's modelled value sits at over four times its earliest registered sale price (1997).
£416,000
Modelled from EPC, postcode comparables.
£54,500
Recorded with HM Land Registry.
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Years Held for 171a runs comfortably ahead of the street norm.
Price per m²
£940
Street avg £4,380
Floor Area
58 m²
Street avg 76 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
Rail-style transport is unusually close for this postcode.
Crime
8/mo
Rising year-on-year across the wider district.
Nearest stop
0.0 km
Burntwood School — bus stop.

Daytime· 07:00 – 23:00
52.1dB

Changes detected from historical EPC data
Heating controls upgraded for better temperature management
More low energy lighting installed
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Extension: Single storey · Side and rear of property
Renewal of pp granted 11/06/08 ref 2008/2285 for erection of single storey side/rear extension.
27 March 1997Most recent
£54,500
Median price across the last 5 sales in SW17 0AL: £925,000 (2025–2021).
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CO₂ Emissions
2.2 t/year
Street avg 2.9 t/year
SW17 0QP
Closest school
0.1 km
Burntwood School. 59 schools nearby.
Night-time· 23:00 – 07:00
42.4dB