21a is a mid-terrace house in London (SW8 1AS). It has a recorded floor area of 41 m² (around 441 sq ft) and construction records dating it to 1900-1929. At 41 m² this is the 2nd smallest of 23 units on EPC record in the building, where floor areas span 39–103 m². The building's EPC ratings span D to C, with this unit at the top. The latest certificate (December 2018) shows a C (score 69), just inside the C band. The rating has held steady at C across 2 certificates since December 2008. Between certificates, lighting went from Poor to Very Good.
Held since January 2005 — that's 21 years off the open market, well above the local norm. Sale prices here have lagged London HPI: -2.8% per year against 0% for the wider region. Today's modelled estimate of £408,000 sits 140% above the 2005 sale of £170,000. On a £-per-square-foot basis, the last sale (£385/sq ft) was about 17.1% below the postcode norm. At 41 m² it's 28.7% smaller than the typical home in the postcode (58 m² median across 48 EPCs).
No planning applications are recorded against 21a, Richborne Terrace, London, SW8 1AS. The full report also covers planning activity across the surrounding area.
Full planning data for 21a, Richborne Terrace, London, SW8 1AS
Every application and decision on this property and nearby, in full, in the report.
21a valuation sits well clear of the typical sold price in this postcode.
£408,000
Modelled from EPC, postcode comparables and a sale-price growth of -2.8% per year over 2 years.
£170,000
Growth on file: -2.8% per year over 2 years.
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21a is notably below the street on floor area.
Price per m²
£4,146
Street avg £8,002
Floor Area
41 m²
Street avg 62 m²
Habitable Rooms
2 rooms
Street avg 3 rooms
Rail-style transport is unusually close for this postcode.
Crime
12/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Dorset Road — bus stop.

Daytime· 07:00 – 23:00
57.8dB

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Changes detected from historical EPC data
Heating controls changed
More low energy lighting installed
7 January 2005Most recent
£170,000
-6.6%over 2 years23 August 2002
£182,000
Median price across the last 5 sales in SW8 1AS: £625,000 (2025–2024).
Detailed EPC data
Full energy ratings, history and recommendations
Full planning history
Every application and decision on record
Comparable sales data
Plus transport, crime, schools and air quality
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CO₂ Emissions
1.6 t/year
Street avg 2.2 t/year
Closest school
0.2 km
Reay Primary School. 98 schools nearby.
Night-time· 23:00 – 07:00
48.5dB