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Flat 101, 15 Portman Square, London, W1H 6LL

UPRN:100022792256Purpose Built Flat1 bedsBuilt 1930-1949
LeaseholdCouncil Tax: Band GEPC: C (69)
Data freshness:Listing· 3mo agoListing: ageing, refreshed 3mo ago (2026-08-18T15:06:06.624761+00:00)Planning· 4mo agoPlanning: stale, refreshed 4mo ago (2026-07-10T09:58:59.448476+00:00)Ownership· freshOwnership: fresh, refreshed 3d ago (2026-11-06T16:23:04.498249+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)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 refreshCouncil Tax· 1mo agoCouncil Tax: ageing, refreshed 1mo ago (2026-10-10T13:54:14.810871+00:00)
Flat 101, 15 Portman Square, London, W1H 6LL

HP Score

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

    Mixed signals - investigate

Evidence
19 of 21 sources
Sale Estimate
£1,457,000
£1.38M - £1.53MHigh
Estimate
£1.46M
Range
£1.38M – £1.53M
Rent Estimate (pcm)
£6,250
£6k - £7k
Monthly
£6,250
Yield
5.15%

Verdict

Derived from HomePortfolio scores

Flat 101 earns an INVESTIGATE rating with HP Score 63/100. Investment score 61/100 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. Tenure is leasehold. 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)HM Land Registry sales matched to addressDefra 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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS
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HP Score
63/ 100
Mixed
Investment Score
61/ 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£1,457,000
Rent Estimate (pcm)£6,250
Gross Yield5.15%
1y Growth-
3y Growth-11.2%
5y Growth-4.7%
10y Growth-0.9%
Last Sold Price£1,350,000 (2021-03-18)
View Market Details

Risk Overview

  • Flood RiskUnknown
  • SubsidenceSignificant
  • RadonLow
  • MiningUnknown
  • LandslideLow
  • Air QualityLow
  • NoiseLow
View Full Risk Report

Planning Activity

Recent Apps
0W1H 6LL
Approval Rate
-12mo
Development
low
  • 26/07415/FULL
    Amalgamation of Flats 3 and 4 (Use Class C3) to form one single dwelling (Use Class C3) including associated internal reconfiguration and refurbishments, alterations to access arrangements and improvements to the existing terrace and private amenity spaces, new plant and other associated works. (Linked with 26/07416/LBC)
    Pending
  • 26/07409/LBC
    Provision of internally illuminated temporary Christmas decoration to front facade at ground floor level between 18th December 2026 and 9th January 2027 (Linked to 26/07429/ADV)
    Pending
  • 26/07416/LBC
    Amalgamation of Flats 3 and 4 to form one single dwelling including associated internal reconfiguration and refurbishments, alterations to access arrangements and improvements to the existing terrace and private amenity spaces. Together with the removal and alteration of modern partitions, roof replacement, rebuilding of the roof terrace, new plant and addition of a new staircase, structural works, new window openings, and other associated works. (Linked with 26/07415/FULL)
    Pending
View Planning Timeline

Ownership

  • Corporate Ownership22.9%
  • Overseas OwnershipNo
  • Lease Term Remaining124 yrs
  • CovenantsNone
  • Lease TypeLeasehold
  • Last Ownership Change2021-03-18
  • SourceLand Registry
View Ownership Details

Connectivity

Broadband (Standard)
16 Mbps
Mobile 4G/5G Coverage
EEThreeO2Vodafone
EV Charger
-
PTAL Rating
-
View Connectivity Map

Area Profile

Median EarningsLocal authority£45,172
Population Density4,908 /km²
Owner Occupied26%
Age Distribution
0-15 11%16-64 80%65+ 9%
View Area Profile

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.

View All Schools

Comparables

View All
  • 15 Portman Square
    -
    £1.01M
    -
  • 15 Portman Square
    -
    £2.00M
    -
  • 15 Portman Square
    -
    £1.34M
    -
  • 15 Portman Square
    -
    £1.20M
    -