Flat 1C, Stone House, 9 Weymouth Street, London, W1W 6DB

UPRN:10033595582Flat/Maisonette3 bedsBuilt -

FreeholdCouncil Tax: Band GEPC: B (81)

Data freshness:Listing· freshPlanning· 3mo agoOwnership· freshEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021Council Tax· 1mo ago

Flat 1C, Stone House, 9 Weymouth Street, London, W1W 6DB

HP Score

/ 100

Strong

Verdict

today

Verdict: INVESTIGATE, on a scale of Buy, Investigate, Avoid.
Strong fundamentals; flood risk not assessed

Evidence

19 of 21 sources

Sale Estimate

£1,565,000

£1.25M - £1.88MLow

Estimate

£1.56M

Range

£1.25M – £1.88M

Rent Estimate (pcm)

£7,750

£7k - £8k

Monthly

£7,750

Yield

4.96%

Verdict

Derived from HomePortfolio scores

Flat 1C earns an INVESTIGATE rating with HP Score 77/100. Investment score 76/100 reflects strong fundamentals. Crime intensity is moderate. Walkability is excellent (100/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Tenure is freehold. 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

77/ 100

Strong

Investment Score

76/ 100

High

Crime Score

60/ 100

Elevated

100

Walkability

100/ 100

Excellent

Transit & Bike

Transit 100Bike 69

Walk Score, out of 100

Opportunity

Not scored as an opportunity

We will not put a number on this one.

headline score requires valuation_edge (estimate confidence LOW below scoring floor)

What we could establish

Rental economics0/40
gross yield 5.0%; range width penalty ×0.88
- valuation_snapshotsrent estimate 7750/mo (range 7150-8400)· as of 31 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -2,344/mo, -30% of rent (6.75% on a 75% loan; no service charge or ground rent disclosed); fails the stress - earns nothing; leasehold with no service charge disclosed - the stress assumes GBP 0
- underwriting_assumptionscosts not disclosed by the advert· as of 5 Nov 2026· verify before relying on this
Risk & liquidity9.2/15
33 sales/12mo in area; valuation range width 40%
- property_intelligencetransactions_12mo

Withholding a score is deliberate. A number built on missing or stale inputs would look more certain than the evidence allows.

Economics

What happens to your money

Your assumptions

Purchase price£1,875,000

At the asking price

Monthly rent£7,750/mo

Evidenced range £7,150-£8,400

Interest rate5.4%

Loan to value75%

Cash required: £702,550
Net cash flow: -£963/mo
Cash on cash: -1.6%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.22 - below the usual 1.25 test. These are your assumptions, not evidence: only the pre-filled rent and price come from the record.

Evidence

Where every number comes from

valuation_snapshotsrent estimate 7750/mo (range 7150-8400)Rental economics · as of 31 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 5 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 5 Nov 2026
property_intelligencetransactions_12moRisk & liquidity

Sold comparables in depth

Risks

What could kill this deal

Score confidence is low
largely a single source - treat the number as a prompt, not a conclusion
Valuation edge could not be scored
estimate confidence LOW below scoring floor
Rental economics needs verification before you rely on it
rent estimate 7750/mo (range 7150-8400)

Plan

Before you offer

1. Get two written rental appraisals from local lettings agents.
The rent estimate rests on area-level evidence, not lettings on this street.
2. Fill the valuation edge gap before relying on the score.
estimate confidence LOW below scoring floor
3. Commission a full structural survey, not a basic condition report.
The score prices market evidence, not the fabric of the building.

Every step above was generated from a specific gap or flag in the evidence - no generic advice, no invented tasks.

Valuation & Market

Sale Estimate£1,565,000

Rent Estimate (pcm)£7,750

Gross Yield4.96%

1y Growth-

3y Growth-6.6%

5y Growth-0.8%

10y Growth-3.2%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

1W1W 6DB

Approval Rate

100%12mo

Development

low

2026/4880/T
REAR GARDEN: 3 x Tree of Heaven (Ailanthus altissima) (T158, T159 & T160) - Fell ground level.
Pending
2026/4882/T
(TPO REF: C5-T8) REAR GARDEN: 1 x Tree of Heaven (Ailanthus altissima) (T74) - Pollard previous points - back to the most recent, previous pollard points, removing around 5m of extended regrowth, to reduce loading and continue established management, maintaining the crown volume within reasonable proportions for the location.
Pending
2026/4885/P
Non-material amendments to planning permission ref. 2024/4840/P dated 20 August 2025 for commercial refurbishment and extension of the building, to amend the wording of Condition 15 (Green Roof Details).
Pending

View Planning Timeline

Ownership

Corporate Ownership15.3%
Overseas OwnershipNo
Lease Term Remaining-
CovenantsRestrictive
Lease TypeFreehold
Last Ownership Change-
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

17 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£45,172

Population Density7,567 /km²

Owner Occupied33%

Age Distribution

0-15 12%16-64 73%65+ 15%

View Area Profile

Schools Nearby

Southbank International School Westminster
0.0 mi
Inspected by ISI
Eifa International School
0.1 mi
Good
Queen's College, London
0.2 mi
Inspected by ISI
The St Marylebone CofE School
0.3 mi
Area grades2025
Inspected after Ofsted withdrew the single overall grade.

2 of 5 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Stone House, 9 Weymouth Street
-
£685k
-
Stone House, 9 Weymouth Street
-
£1.60M
-
Stone House, 9 Weymouth Street
-
£2.50M
-
Stone House, 9 Weymouth Street
-
£1.74M
-

Boundary data not available for this property

No registered title polygon, building footprint, or street match for this property yet.

Why: No HMLR INSPIRE / OSM footprint / OS Open USRN match for this UPRN

Source: HM Land Registry INSPIRE / OpenStreetMap / OS Open USRN