Flat 3, St. Marks Mansions, London N4 3QZ

Mid-Terrace flat · Built 1900-1929 · 77 m² · Rented (Private) · Boiler and radiators, mains gas

Upgrade Plan

CB for £13,900 · £13,900 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Solid wall insulation£4,000 – £14,000£22041.0 yrs+6.7 pts
Double glazing£3,300 – £6,500£7350+ yrs+2.3 pts · reaches B

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

£886
per year at grade C
£593
per year at grade B

The full plan saves £293 a year — a 2.1% annual return on £13,900.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2021, states £538 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

3 January 2025£650,000
29 September 2006£245,000

Estimated today: £628,929 HPI-indexed estimate, not a valuation

Tollington Park: 501 sales since 1995 · £517,542 average over 10 years

Schools nearby

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

SchoolPhaseDistanceProgress
Pooles Park Primary SchoolPrimary0.2 mi
Christ The King Catholic Primary SchoolPrimary0.2 mi
St Mark's CofE Primary SchoolPrimary0.2 mi
Arts and Media School IslingtonSecondary0.2 miProgress 8 +0.17 · average (2023/24)
City of London Academy, Highgate HillSecondary0.6 miProgress 8 +0.12 · average (2023/24)
Lift Beacon HighSecondary1.0 miNot in the KS4 performance tables

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.

29.8
crimes a month
328
in the last 12 months
Anti-social behaviour
most common · 29% of the total

Police.uk street-level data for LSOA E01002808, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Tollington Park

How this home sits against its street.

342
graded homes
68.8
average score
C
most common grade
+4.2
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.