313a Blackfen Road, Sidcup DA15 9NG

Semi-Detached flat · Built 1930-1949 · 37 m² · Rented (Private) · Boiler and radiators, electric

Upgrade Plan

ED for £7,000 · £7,000 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Solid wall insulation£14,000 – £0£32321.7 yrs+11.0 pts · reaches D

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

£1,519
per year at grade E
£1,196
per year at grade D

The full plan saves £323 a year — a 4.6% annual return on £7,000.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2018, states £893 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

No sale recorded for this address since 1995.

Schools nearby

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

SchoolPhaseDistanceProgress
Sherwood Park Primary SchoolPrimary0.4 mi
Danson Primary SchoolPrimary0.5 mi
Days Lane Primary SchoolPrimary0.5 mi
Blackfen School for GirlsSecondary0.3 miProgress 8 -0.14 · average (2023/24)
Bexley Grammar SchoolSecondary0.5 miProgress 8 +0.49 · above average (2023/24)
Hurstmere SchoolSecondary0.9 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.

9.9
crimes a month
109
in the last 12 months
Violence and sexual offences
most common · 36% of the total

Police.uk street-level data for LSOA E01000352, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.