Flat B, 21C, Devonshire St, London W1G 6PD

Not Recorded flat · Built before 1900 · 67 m² · Owner-Occupied · Boiler and radiators, mains gas

Upgrade Plan

DC for £1,050 · £1,050 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Flat roof insulation£900 – £1,200£10010.5 yrs+3.2 pts · reaches C
Floor insulation(optional, beyond C)£5,000 – £10,000£13250+ yrs+4.2 pts
Solid wall insulation(optional, beyond C)£7,500 – £11,000£14350+ yrs+4.6 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

£1,052
per year at grade D
£677
per year at grade C

The full plan saves £100 a year — a 9.5% annual return on £1,050.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2025, states £969 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
St Vincent's Catholic Primary SchoolPrimary0.2 mi
All Souls CofE Primary SchoolPrimary0.5 mi
St Mary's Bryanston Square CofE SchoolPrimary0.5 mi
The St Marylebone CofE SchoolSecondaryunder 0.1 miProgress 8 +0.69 · well above average (2023/24)
Academy21Secondary0.9 miNot in the KS4 performance tables
Maria Fidelis Catholic School FCJSecondary0.9 miProgress 8 -0.58 · well below average (2023/24)

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.

19.8
crimes a month
218
in the last 12 months
Theft from the person
most common · 23% of the total

Police.uk street-level data for LSOA E01004716, 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.