Flat 1, Castle Main House, 12 Rose and Crown Yard, London, SW1Y 6RE

UPRN:200002498960Purpose Built Flat1 bedsBuilt 1996-2002

LeaseholdCouncil Tax: -EPC: B (81)

Data freshness:Listing· freshPlanning· 4mo agoOwnership· 1mo agoEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

Flat 1, Castle Main House, 12 Rose and Crown Yard, London, SW1Y 6RE

HP Score

/ 100

Mixed

Verdict

yesterday

Verdict: INVESTIGATE, on a scale of Buy, Investigate, Avoid.
Mixed signals - investigate

Evidence

20 of 21 sources

Sale Estimate

£1,160,000

£1.04M - £1.28MMedium

Estimate

£1.16M

Range

£1.04M – £1.28M

Rent Estimate (pcm)

£4,500

£4k - £5k

Monthly

£4,500

Yield

4.32%

Verdict

Derived from HomePortfolio scores

Flat 1 earns an INVESTIGATE rating with HP Score 62/100. Investment score 60/100 reflects moderate fundamentals. Crime intensity is elevated. Walkability is excellent (99/100). 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 covenantsHM Land Registry leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

62/ 100

Mixed

Investment Score

60/ 100

Moderate

100

Crime Score

100/ 100

Elevated

Walkability

99/ 100

Excellent

Transit & Bike

Transit 100Bike 75

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 4 Nov 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 edge0/15
claims [AVM -7.8% (MEDIUM)] → measured edge +0.00pp of the ask; on later-registered sales an AVM discount carried no edge and a sold-evidence gap at most +0.5pp
Market estimate used (MEDIUM confidence) · snapshot 9 Nov 2026
- valuation_snapshotsestimate for 200002498960· as of 9 Nov 2026
Rental economics0/40
gross yield 4.3%; range width penalty ×0.76
- valuation_snapshotsrent estimate 4500/mo (range 4000-5000)· as of 9 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -2,096/mo, -47% 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 4 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 1 price cut(s), 117 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 4 Nov 2026
Risk & liquidity7.1/15
9 sales/12mo in area; valuation range width 20%
- 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

£937,500£1,437,500

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£1,250,000

At the asking price

Monthly rent£4,500/mo

Evidenced range £4,000-£5,000

Interest rate5.4%

Loan to value75%

Cash required: £445,050
Net cash flow: -£1,103/mo
Cash on cash: -3.0%
Score at this price: 7

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.07 - 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 200002498960Valuation edge · as of 9 Nov 2026
valuation_snapshotsrent estimate 4500/mo (range 4000-5000)Rental economics · as of 9 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 4 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 4 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
Rental economics needs verification before you rely on it
rent estimate 4500/mo (range 4000-5000)
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. Ask the agent why the price was reduced and whether a previous sale fell through.
1 price cut(s) recorded on the listing history.
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£1,160,000

Rent Estimate (pcm)£4,500

Gross Yield4.32%

1y Growth-

3y Growth-16.1%

5y Growth-15.2%

10y Growth-12.7%

Last Sold Price£498,000 (2004-02-04)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0SW1Y 6RE

Approval Rate

-12mo

Development

low

26/07410/FULL
Alterations to the existing basement to Level 06, and an extension of the existing building to provide an additional floor of new office (Class E(g)(i)) floorspace, including a new roof level terrace and plant room; public realm and associated works.
Pending
26/07421/LBC
Installation of non-illuminated vinyl lettering to the external face of the existing ground-floor shopfront windows for a temporary period. (Linked with 26/07083/ADV)
Pending
26/07420/COGADF
Details of each proposed sculpture by way of drawings, photographs and artists CV pursuant to condition 3 of planning permission dated 30.09.2025 (RN:25/05296/COFUL)
Pending

View Planning Timeline