21 Lakeside Close, Sidcup DA15 9PW

Semi-Detached house · Built 1900-1929 · 92 m² · Owner-occupied · Boiler and radiators, mains gas

Upgrade Plan

DB for £15,440 · £7,720 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Low energy lighting£40£411.0 yrs+0.2 pts
Floor insulation£800 – £1,200£8312.0 yrs+4.3 pts · reaches C
Heating controls£350 – £450£3013.2 yrs+1.6 pts
Solar water heating£4,000 – £6,000£6450+ yrs+3.3 pts
Solid wall insulation£4,000 – £14,000£9050+ yrs+4.6 pts · reaches B
Solar photovoltaic panels(optional, beyond B)£9,000 – £14,000£7750+ yrs+4.0 pts

Grants verified 20 August 2026. Costs are the register’s indicative ranges. Savings are restated at the fuel prices assumed in July 2026. Points per measure are estimated from 19.9 million certificates and rescaled to this home’s own certificate delta; the total is the register’s figure.

Running costs

£1,245
per year at grade D
£897
per year at grade B

The full plan saves £271 a year — a 1.8% annual return on £15,440.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2012, states £736 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

28 March 2013£219,000
22 July 2005£195,000
11 February 2000£100,000
14 November 1997£85,500

Estimated today: £439,773 HPI-indexed estimate, not a valuation

Lakeside Close: 52 sales since 1995 · £369,528 average over 10 years

Schools nearby

The schools’ own performance — Progress 8 shows value added, not just raw results.

SchoolPhaseDistanceProgress
Sherwood Park Primary SchoolPrimary0.3 mi
Danson Primary SchoolPrimary0.6 mi
Hurst Primary SchoolPrimary0.7 mi
Blackfen School for GirlsSecondary0.3 miProgress 8 -0.14 · average (2023/24)
Bexley Grammar SchoolSecondary0.6 miProgress 8 +0.49 · above average (2023/24)
Hurstmere SchoolSecondary0.8 miAttainment 8 42.1 · no Progress 8 published

Schools from the DfE register, performance from the KS4 performance tables. Progress 8 is a GCSE measure, so primaries have none. Distance is straight-line from the postcode, not a catchment: admission is decided by the school, not by us.

Area context

Police-recorded crime for the wider neighbourhood, not this address. We grade homes, never neighbourhoods — so this is reported as a count, not a rating.

8.8
crimes a month
88
in the last 12 months
Vehicle crime
most common · 28% of the total

Police.uk street-level data for LSOA E01000391, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Lakeside Close

How this home sits against its street.

22
graded homes
58.8
average score
D
most common grade
+8.2
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.