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

HP Score
- Verdict: AVOID, on a scale of Buy, Investigate, Avoid.
Significant risk factors
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.
Valuation & Market
Risk Overview
- Flood RiskUnknown
- SubsidenceSignificant
- RadonLow
- MiningUnknown
- LandslideLow
- Air QualityLow
- NoiseLow
Planning Activity
- Pending26/07460/FULLInstallation 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.
- Pending26/07475/ADLBCDetails 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).
- Pending26/07459/NMAAmendments 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.
Ownership
- Corporate Ownership22.9%
- Overseas OwnershipNo
- Lease Term Remaining34 yrs
- CovenantsRestrictive
- Lease Type-
- Last Ownership Change-
- SourceLand Registry
Connectivity
Area Profile
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-