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Get started21 Birchwood Avenue is a four-bedroom detached house in Sidcup (DA14 4JY). It has a recorded floor area of 124 m² (around 1335 sq ft), construction records dating it to 1930-1949 and council tax band G. The latest certificate (June 2014) shows an F (score 33), near the bottom of the EPC scale. The recommended improvements would lift it to C (score 75), a 3-band jump. The latest certificate is from June 2014, so improvements made since then won't be reflected. Other recorded features include a conservatory.
2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension and a conservatory, meaningful when judging how the property has evolved. At 124 m² it's 16.2% smaller than the typical home in the postcode (148 m² median across 7 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 71% of similar EPCs). Last sold in September 2014, so it's been off the market for around 12 years. Today's modelled estimate of £870,000 is 28.9% above the 2014 sale price.
21 Birchwood Avenue's carbon output runs well above what efficient homes in the postcode produce.
This certificate is over 10 years old and is no longer valid.Expired 04 Jun 2024
Multiple extension applications run across more than a decade of planning history at 21 Birchwood Avenue.
Extension: Single storey · Rear of property
Single storey rear extension
21 Birchwood Avenue valuation sits well clear of the typical sold price in this postcode.
£870,000
Modelled from EPC, postcode comparables.
£675,000
Recorded with HM Land Registry.
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21 Birchwood Avenue outperforms the street on years held by a wide margin.
Price per m²
£5,444
Street avg £5,105
Floor Area
124 m²
Street avg 159 m²
Habitable Rooms
6 rooms
Rail-style transport is unusually close for this postcode.
Crime
4/mo
Steady year-on-year across the wider district.
Nearest stop
0.4 km
Birchwood Avenue (DA14) — bus stop.

Daytime· 07:00 – 23:00
50.9dB

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Conservatory.
25 September 2014Most recent
£675,000
Median price across the last 5 sales in DA14 4JY: £800,000 (2024–2018).
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Energy costs, comparable sales, crime, schools and transport

Street avg 7 rooms
CO₂ Emissions
9.6 t/year
Street avg 9.9 t/year
DA14 4ND
Closest school
0.4 km
Birkbeck Primary School. 29 schools nearby.
Night-time· 23:00 – 07:00
40.4dB