41A Portnall Road, London, W9 3BA

UPRN:10033599598Converted Flat3 bedsBuilt -

LeaseholdCouncil Tax: Band EEPC: -

Data freshness:Listing· freshOwnership· freshRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

HP Score

/ 100

Mixed

Verdict

2 days ago

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

Evidence

19 of 21 sources

Sale Estimate

£744,000

£670k - £819kMedium

Estimate

£744k

Range

£670k – £819k

Rent Estimate (pcm)

£3,150

£3k - £3k

Monthly

£3,150

Yield

4.72%

Verdict

Derived from HomePortfolio scores

41A Portnall Road earns an INVESTIGATE rating with HP Score 57/100. Investment score 64/100 reflects moderate fundamentals. Crime intensity is elevated. Walkability is excellent (95/100). 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 SourcesPortal 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

57/ 100

Mixed

Investment Score

64/ 100

Moderate

100

Crime Score

100/ 100

Elevated

Walkability

95/ 100

Excellent

Transit & Bike

Transit 74Bike 77

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 -7.5% (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 31 Oct 2026
- valuation_snapshotsestimate for 10033599598· as of 31 Oct 2026
Rental economics0/40
gross yield 4.7%; range width penalty ×0.85
- valuation_snapshotsrent estimate 3150/mo (range 2900-3450)· as of 31 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,191/mo, -38% of rent (6.75% on a 75% loan; disclosed service charge and ground rent); fails the stress - earns nothing; leasehold with no service charge disclosed - the stress assumes GBP 0
- listing_factsservice charge / ground rent from the advert· as of 4 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 1 price cut(s), 65 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 & liquidity12.8/15
258 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

£600,000£920,000

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£800,000

At the asking price

Monthly rent£3,150/mo

Evidenced range £2,900-£3,450

Interest rate5.4%

Loan to value75%

Cash required: £271,300
Net cash flow: -£519/mo
Cash on cash: -2.3%
Score at this price: 13

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.17 - 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 10033599598Valuation edge · as of 31 Oct 2026
valuation_snapshotsrent estimate 3150/mo (range 2900-3450)Rental economics · as of 31 Oct 2026 · verify before relying on this
listing_factsservice charge / ground rent from 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 3150/mo (range 2900-3450)
Stress margin needs verification before you rely on it
service charge / ground rent from 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£744,000

Rent Estimate (pcm)£3,150

Gross Yield4.72%

1y Growth+6.7%

3y Growth-4.5%

5y Growth-0.6%

10y Growth-0.3%

Last Sold Price£422,000 (2007-03-02)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

1W9 3BA

Approval Rate

-12mo

Development

low

26/07389/NMA
Amendments to planning permission dated 04 June 2025 (RN: 25/02022/FULL), NAMELY, amendment of Condition 4 to correct the property address from 9 Aldridge Road Villas to Flat 1 5 Grittleton Road.
Approved
26/07381/CLEUD
Use of the ground floor rear flat as short-term visitor accommodation.
Pending
26/07363/FULL
Demolition of existing rear/side extension and construction of a new extension together with new glazing and doors, and changing the existing rooflights to the rear roof slope with new rooflights.
Pending

View Planning Timeline