Flat 4, The Polygon, Avenue Road, London, NW8 6JB

UPRN:5059304Flat/Maisonette3 bedsBuilt 1950-1966

LeaseholdCouncil Tax: Band GEPC: C (69)

Data freshness:Listing· freshPrice Paid· freshPlanning· 4mo agoOwnership· freshEPC· 1mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021Council Tax· 6mo ago

Flat 4, The Polygon, Avenue Road, London, NW8 6JB

HP Score

/ 100

Mixed

Verdict

today

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

Evidence

20 of 21 sources

Sale Estimate

£1,589,000

£1.43M - £1.75MMedium

Estimate

£1.59M

Range

£1.43M – £1.75M

Rent Estimate (pcm)

£8,000

£7k - £9k

Monthly

£8,000

Yield

6.62%

Verdict

Derived from HomePortfolio scores

Flat 4 earns an INVESTIGATE rating with HP Score 71/100. Investment score 70/100 reflects strong fundamentals. Crime intensity is elevated. Walkability is excellent (91/100). 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

71/ 100

Mixed

Investment Score

70/ 100

High

Crime Score

70/ 100

Elevated

Walkability

91/ 100

Excellent

Transit & Bike

Transit 69Bike 69

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 3 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 +8.7% (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 Oct 2026
- valuation_snapshotsestimate for 5059304· as of 9 Oct 2026
Rental economics11.5/40
gross yield 6.6%; range width penalty ×0.89
- valuation_snapshotsrent estimate 8000/mo (range 7400-8650)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -367/mo, -5% 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 3 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 47 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 3 Nov 2026
Risk & liquidity12.8/15
188 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

£1,087,500£1,667,500

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£1,450,000

At the asking price

Monthly rent£8,000/mo

Evidenced range £7,400-£8,650

Interest rate5.4%

Loan to value75%

Cash required: £525,050
Net cash flow: £645/mo
Cash on cash: 1.5%
Score at this price: 24

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.63 - 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 5059304Valuation edge · as of 9 Oct 2026
valuation_snapshotsrent estimate 8000/mo (range 7400-8650)Rental economics · as of 9 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 3 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 3 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 8000/mo (range 7400-8650)
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£1,589,000

Rent Estimate (pcm)£8,000

Gross Yield6.62%

1y Growth-

3y Growth-12.9%

5y Growth-1.0%

10y Growth-1.6%

Last Sold Price£745,000 (2007-03-19)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0NW8 6JB

Approval Rate

-12mo

Development

low

2026/4844/T
FRONT GARDEN: 1 x Lime (T1) - Reduce crown by 35%, back to previous growth points 4m of height and 2.5m of width.
Pending
2026/4638/P
Erection of additional storey with flank window, repositioning of entrance door, replacement of garden fence, and installation of 2x air source heat pumps on roof of new storey.
Pending
2026/4824/T
FRONT GARDEN: 1 x Ash (T1) - Reduce main upper crown to previous pruning points not to breach new heartwood in pruning by returning to small diameter points in pruning points.
Pending

View Planning Timeline