Flat 55, Marlborough, 61 Walton Street, London, SW3 2JX

UPRN:217100716Purpose Built Flat2 bedsBuilt before 1900

LeaseholdCouncil Tax: -EPC: D (65)

Data freshness:Listing· freshPrice Paid· freshPlanning· 4mo agoEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoAmenities· 1mo agoArea· Census 2021

Flat 55, Marlborough, 61 Walton Street, London, SW3 2JX

HP Score

/ 100

Strong

Verdict

3 days ago

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

Evidence

19 of 21 sources

Sale Estimate

£727,000

£690k - £763kHigh

Estimate

£727k

Range

£690k – £763k

Rent Estimate (pcm)

£3,300

£3k - £4k

Monthly

£3,300

Yield

4.66%

Verdict

Derived from HomePortfolio scores

Flat 55 earns an INVESTIGATE rating with HP Score 84/100. Investment score 68/100 reflects moderate fundamentals. Crime intensity is low. Walkability is excellent (96/100). 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

HP Score

84/ 100

Strong

Investment Score

68/ 100

Moderate

Crime Score

19/ 100

Moderate

Walkability

96/ 100

Excellent

Transit & Bike

Transit 79Bike 70

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 29 Oct 2026

This rests largely on a single source. Treat the score as a prompt to investigate, not a conclusion.

Check before relying on this score: leasehold with no service charge disclosed - the stress test assumes GBP 0. It ranks after every home whose inputs are verified.

Valuation edge-1.6/15
claims [AVM -16.9% (HIGH), sold-comps -15.8%, £/sqft -15.9%] → measured edge -0.33pp of the ask; on later-registered sales an AVM discount carried no edge and a sold-evidence gap at most +0.5pp; asking more than 10% above the estimate (measured -0.33pp)
Market estimate used (HIGH confidence) · snapshot 9 Oct 2026
- valuation_snapshotsestimate for 217100716· as of 9 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 18%· as of 21 Oct 2026
Rental economics0/40
gross yield 4.7%; range width penalty ×0.90
- valuation_snapshotsrent estimate 3300/mo (range 3050-3550)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,290/mo, -39% 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 29 Oct 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 44 days on market; homes with a cut sold 0.2-0.3pp further below the cut ask, which is not an edge
- portal_listingsprice_changes + first_published_date· as of 29 Oct 2026
Risk & liquidity14.6/15
190 sales/12mo in area; valuation range width 10%
- property_intelligencetransactions_12mo

4 of 4 components scored. Ranks on gross yield, the stress margin, risk and disclosed facts. A pricing claim earns only its measured edge: today 0 for the market estimate and at most +0.5pp for sold evidence. The score itself is not yet checked against the outcomes of homes it scored.

Economics

What happens to your money

Price sensitivity

£637,500£977,500

The same scorer re-run at hypothetical asking prices, holding rent, comps and listing history constant. Not a prediction of what the seller would accept.

Your assumptions

Purchase price£850,000

At the asking price

Monthly rent£3,300/mo

Evidenced range £3,050-£3,550

Interest rate5.4%

Loan to value75%

Cash required: £288,800
Net cash flow: -£584/mo
Cash on cash: -2.4%
Score at this price: 13

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.15 - 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_snapshotsestimate for 217100716Valuation edge · as of 9 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 18%Valuation edge · as of 21 Oct 2026
valuation_snapshotsrent estimate 3300/mo (range 3050-3550)Rental economics · as of 9 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 29 Oct 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 29 Oct 2026

Risks

What could kill this deal

Score confidence is low
largely a single source - treat the number as a prompt, not a conclusion
Rental economics needs verification before you rely on it
rent estimate 3300/mo (range 3050-3550)
Stress margin needs verification before you rely on it
costs not disclosed by the advert

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. 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£727,000

Rent Estimate (pcm)£3,300

Gross Yield4.66%

1y Growth+0.4%

3y Growth-9.5%

5y Growth-4.5%

10y Growth-2.4%

Last Sold Price£749,000 (2024-04-09)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0SW3 2JX

Approval Rate

-12mo

Development

low

26/07237/ADFULL
Details of the proposed paving materials either side the length of the wall to be replaced, including photographs of the existing paving (taken before the works begin) and photographs of samples of the paving to be reinstated or newly laid, along with plan drawings showing what paving materials will be used where and the proposed render to be used on the new wall, including specifics of its finished colour and photographs of samples pursuant to condition 4 of planning permission dated 19.03.2026 (RN:25/09234/FULL)
Pending
26/07236/ADLBC
details of the proposed paving materials either side the length of the wall to be replaced, including photographs of the existing paving (taken before the works begin) and photographs of samples of the paving to be reinstated or newly laid, along with plan drawings showing what paving materials will be used where and the proposed render to be used on the new wall, including specifics of its finished colour and photographs of samples pursuant to condition 3 of listed building dated 19th March 2026 (RN:25/09235/LBC )
Pending
26/07228/ADFULL
Details of the raised boundary wall and sample panel pursuant to condition 4 of planning permission dated 30 September 2026 (RN: 26/04283/FULL).
Pending

View Planning Timeline

Ownership

Corporate Ownership32.6%
Overseas OwnershipNo
Lease Term Remaining999+ yrs
CovenantsNone
Lease TypeLeasehold
Last Ownership Change2024-04-09
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

18 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£46,690

Population Density10,287 /km²

Owner Occupied44%

Age Distribution

0-15 16%16-64 69%65+ 15%

View Area Profile

Schools Nearby

Marlborough Primary School
0.2 mi
Area grades2024
Inspected after Ofsted withdrew the single overall grade.
Knightsbridge School
0.2 mi
Inspected by ISI
Sussex House School
0.3 mi
Inspected by ISI
St Joseph's Catholic Primary School
0.3 mi
Outstanding

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

View All Schools

Comparables

View All

Marlborough, 61 Walton Street
-
£730k
-
Marlborough, 61 Walton Street
-
£775k
-
Marlborough, 61 Walton Street
-
£1.05M
-
Marlborough, 61 Walton Street
-
£710k
-

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