77 Cossall Walk, London, SE15 2TN

UPRN:200003382899Flat/MaisonetteBeds -Built 1950-1966

Tenure: -Council Tax: Band BEPC: D (65)

Data freshness:Listing· freshPlanning· 4mo agoOwnership· freshEPC· 6mo agoRisk· 5mo agoCrime· freshConnectivity· 1mo agoAmenities· 2mo agoArea· Census 2021Council Tax· 6mo ago

HP Score

/ 100

Mixed

Verdict

yesterday

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

Evidence

17 of 21 sources

Sale Estimate

£315,000

£283k - £346kMedium

Estimate

£315k

Range

£283k – £346k

Rent Estimate (pcm)

£1,700

£2k - £2k

Monthly

£1,700

Yield

6.80%

Verdict

Derived from HomePortfolio scores

77 Cossall Walk earns an INVESTIGATE rating with HP Score 68/100. Investment score 70/100 reflects strong fundamentals. Crime intensity is elevated. Walkability is excellent (88/100). 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.

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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

68/ 100

Mixed

Investment Score

70/ 100

High

Crime Score

67/ 100

Elevated

Walkability

88/ 100

Excellent

Transit & Bike

Transit 43Bike 77

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence1 independent sourceLead to verifyListing checked 12 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 edge2.5/15
claims [AVM +4.8% (MEDIUM), sold-comps +6.0%, £/sqft +5.9%] → measured edge +0.50pp 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 200003382899· as of 9 Nov 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.2%· as of 11 Nov 2026
Rental economics13.9/40
gross yield 6.8%; range width penalty ×0.96
- valuation_snapshotsrent estimate 1700/mo (range 1600-1800)· as of 9 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -146/mo, -9% 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 12 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 72 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 12 Nov 2026
Risk & liquidity12.8/15
420 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

£225,000£345,000

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£300,000

At the asking price

Monthly rent£1,700/mo

Evidenced range £1,600-£1,800

Interest rate5.4%

Loan to value75%

Cash required: £96,300
Net cash flow: £164/mo
Cash on cash: 2.0%
Score at this price: 29

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.68 - clears 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 200003382899Valuation edge · as of 9 Nov 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.2%Valuation edge · as of 11 Nov 2026
valuation_snapshotsrent estimate 1700/mo (range 1600-1800)Rental economics · as of 9 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 12 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 12 Nov 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 1700/mo (range 1600-1800)
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. Treat the gap to the estimate as unproven - compare recent sold prices on the street yourself before pricing an offer around it.
On later completions, homes listed below their estimate sold at the same share of the asking price as the rest.
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£315,000

Rent Estimate (pcm)£1,700

Gross Yield6.80%

1y Growth-

3y Growth-0.6%

5y Growth-1.0%

10y Growth+1.1%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningModerate
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0SE15 2TN

Approval Rate

-12mo

Development

low

DC/26/146014
REAR: ONE Poplar (T1)(ht.18m) FELLED by storm. Reason: this huge tree fell over 8 rear gardens by Storm Austen.
Pending
26/AP/3287
Single storey side and rear extension
Pending
26/AP/3289
Retro-respective retention of existing shop frontange of roller shutter to serve juice bar as separate unit from current beauty salon
Pending

View Planning Timeline