Basement Flat, 15 Portman Square, London, W1H 6LJ
UPRN:10033526883-Beds -Built -
Tenure: -Council Tax: -EPC: -
Data freshness:Listing· freshListing: fresh, refreshed 2d ago (2026-11-05T04:00:06.311246+00:00)Price Paid· freshPrice Paid: fresh, refreshed 6d ago (2026-11-01T08:46:36.773860+00:00)Ownership· freshOwnership: fresh, refreshed today (2026-11-06T17:34:01.679477+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 (2026-10-06T08:24:30.427161+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
HP Score
61
/ 100
Mixed
Verdict
today
- Verdict: INVESTIGATE, on a scale of Buy, Investigate, Avoid.
Mixed signals - investigate
Evidence
17 of 21 sourcesSale Estimate
£1,874,000
£1.50M - £2.25MLow
Estimate
£1.87M
Range
£1.50M – £2.25M
Rent Estimate (pcm)
--
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Verdict
Derived from HomePortfolio scores
Basement Flat earns an INVESTIGATE rating with HP Score 61/100. Investment score 54/100 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 SourcesPortal listingsOfcom Connected NationsMarket 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
61
HP Score
61/ 100
Mixed
54
Investment Score
54/ 100
Moderate
100
Crime Score
100/ 100
Elevated
100
Walkability
100/ 100
Excellent
Transit & Bike
Transit 94Bike 71
Walk Score, out of 100
Valuation & Market
Sale Estimate£1,874,000
Rent Estimate (pcm)-
Gross Yield-
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
- Pending26/07390/LBCInstallation of a non-illuminated fascia sign measuring 0.29m x 0.79m and two vinyl signs applied to inside face of the glazed shopfront each measuring 0.22m x 0.84m. (Linked with 26/06970/ADV)
- Pending26/07382/FULLUse of the building as an embassy (sui generis)
- Pending26/07367/ADLBCDetails of new coordinated service routes pursuant to condition 6 (6) of listed building consent dated 14 March 2023 (RN: 22/05005/LBC)
Ownership
- Corporate Ownership22.9%
- Overseas OwnershipNo
- Lease Term Remaining-
- CovenantsRestrictive
- Lease Type-
- Last Ownership Change-
- SourceLand Registry
Connectivity
Broadband (Standard)
16 Mbps
Mobile 4G/5G Coverage
-
EV Charger
-
PTAL Rating
-
Area Profile
Median EarningsLocal authority£45,172
Population Density4,908 /km²
Owner Occupied26%
Age Distribution
0-15 11%16-64 80%65+ 9%
Schools Nearby
- Inspected by ISIWetherby Preparatory School0.2 mi
- Inspected by ISIHalcyon London International School0.2 mi
- Inspected by ISISylvia Young Theatre School0.2 mi
- St Vincent's Catholic Primary School0.2 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
- 15 Portman Square-£2.70M-
- 15 Portman Square-£2.10M-
- 15 Portman Square-£25k-
- 15 Portman Square-£975k-