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Flat 18, 15 Portman Square, London, W1H 6LJ

UPRN:100022792185Flat/Maisonette3 bedsBuilt before 1900
Tenure: -Council Tax: -EPC: D (65)
Data freshness:Listing· 3mo agoListing: ageing, refreshed 3mo ago (2026-08-18T15:06:06.624761+00:00)Ownership· freshOwnership: fresh, refreshed yesterday (2026-11-10T13:33:30.793547+00:00)EPC· 6mo agoEPC: stale, refreshed 6mo ago (2026-05-20T10:58:39.129138+00:00)Risk· 5mo agoRisk: stale, refreshed 5mo ago (2026-06-18T00:00:00+00:00)Crime· freshCrime: fresh, refreshed today (2026-11-11T13:01:03.839912+00:00)Connectivity· 1mo agoConnectivity: ageing, refreshed 1mo ago (2026-10-03T06:43:10.905825+00:00)Schools· 1mo agoSchools: ageing, refreshed 1mo ago (2026-10-06T05:00:30.533230+00:00)Amenities· 2mo agoAmenities: ageing, refreshed 2mo ago (2026-09-23T00:00:00+00:00)Area· Census 2021Area: static reference data (Census 2021); authoritative and does not refresh
Flat 18, 15 Portman Square, London, W1H 6LJ
Location map - no listing photos available

HP Score

Mixed
Verdict
today
  • Verdict: AVOID, on a scale of Buy, Investigate, Avoid.

    Significant risk factors

Evidence
19 of 21 sources
Sale Estimate
£2,072,000
£1.66M - £2.49MLow
Estimate
£2.07M
Range
£1.66M – £2.49M
Rent Estimate (pcm)
£8,850
£8k - £10k
Monthly
£8,850
Yield
5.13%

Verdict

Derived from HomePortfolio scores

Flat 18 earns an AVOID rating with HP Score 62/100. Investment score 58/100 reflects moderate fundamentals. Crime intensity is elevated. Walkability is excellent (100/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Every figure here comes from the live HomePortfolio API; anything it does not publish is left out.

Key SourcesEPC RegisterPortal listingsOfcom Connected NationsOfcom mobile coverageMarket estimates (third-party AVM)Defra strategic noise mapping, England Round 4 (Contains Defra data © Crown copyright and database right 2023-2024, Open Government Licence v3.0)Walk ScoreONS Census 2021Police.ukHM Land Registry company ownershipHM Land Registry covenantsHM Land Registry leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS
HP Score
62/ 100
Mixed
Investment Score
58/ 100
Moderate
Crime Score
100/ 100
Elevated
Walkability
100/ 100
Excellent
Transit & Bike
Transit 94Bike 71
Walk Score, out of 100

Valuation & Market

Sale Estimate£2,072,000
Rent Estimate (pcm)£8,850
Gross Yield5.13%
1y Growth+8300.0%
3y Growth-11.2%
5y Growth-4.7%
10y Growth-0.9%
Last Sold Price-

Risk Overview

  • Flood RiskUnknown
  • SubsidenceSignificant
  • RadonLow
  • MiningUnknown
  • LandslideLow
  • Air QualityLow
  • NoiseLow

Planning Activity

Recent Apps
2W1H 6LJ
Approval Rate
-12mo
Development
low
  • 26/07460/FULL
    Installation of new public art sculptures and seating; hard and soft landscaping; installation of an area of raised terrace decking on St George Street measuring 43m x 2.6m for the placing of tables, chairs and banquette benches in connection with restaurant use; and associated external alterations and enabling works.
    Pending
  • 26/07475/ADLBC
    Details of the methodology for repairs to the external render, stonework, ironwork and windows pursuant to Conditions 4 and 5 of listed building consent dated 17 September 2026 (RN: 26/04900/LBC).
    Pending
  • 26/07459/NMA
    Amendments to planning pemrission dated 10 October 2025 (RN: 25/01558/FULL) for the: Partial demolition, refurbishment and extension of the existing building to provide a sub-basement, basement, ground plus eight storey building; infilling and stepped rear extension; excavation of a new sub-basement level; installation of new plant equipment at basement and roof level; terraces at fourth, fifth, sixth, seventh and eighth floor levels; soft and hard landscaping; reprovision of car parking; new cycle parking facilities; and associated external works. Use of the building for retail and/or restaurant (Class E) on part ground floor and office (Class E) on all other floors. NAMELY, to allow alterations to the design of the ground floor frontages on Hanover Square and St George Street.
    Pending

Ownership

  • Corporate Ownership22.9%
  • Overseas OwnershipNo
  • Lease Term Remaining34 yrs
  • CovenantsRestrictive
  • Lease Type-
  • Last Ownership Change-
  • SourceLand Registry

Connectivity

Broadband (Standard)
19 Mbps
Mobile 4G/5G Coverage
EEThreeO2Vodafone
EV Charger
-
PTAL Rating
-

Area Profile

Median EarningsLocal authority£45,172
Population Density-
Owner Occupied26%
Age Distribution
0-15 11%16-64 80%65+ 9%

Schools Nearby

  • Wetherby Preparatory School
    0.2 mi
    Inspected by ISI
  • Halcyon London International School
    0.2 mi
    Inspected by ISI
  • Sylvia Young Theatre School
    0.2 mi
    Inspected by ISI
  • St Vincent's Catholic Primary School
    0.2 mi

    Inspected as St Vincent's Catholic Primary School (URN 101143) on 23 Nov 2023

4 of 6 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

Comparables

View All
  • 15 Portman Square
    -
    £2.70M
    -
  • 15 Portman Square
    -
    £2.10M
    -
  • 15 Portman Square
    -
    £25k
    -
  • 15 Portman Square
    -
    £975k
    -