37 Syon Lane, Isleworth, TW7 5BU

UPRN:100021574897End Terrace House4 bedsBuilt 1930-1949

FreeholdCouncil Tax: Band DEPC: C (73)

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

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

£661,000

£628k - £694kHigh

Estimate

£661k

Range

£628k – £694k

Rent Estimate (pcm)

£3,000

£3k - £3k

Monthly

£3,000

Yield

5.14%

Verdict

Derived from HomePortfolio scores

37 Syon Lane earns an INVESTIGATE rating with HP Score 70/100. Investment score 68/100 reflects moderate fundamentals. Crime intensity is moderate. Walkability is limited (65/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Tenure is freehold. 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 Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

70/ 100

Mixed

Investment Score

68/ 100

Moderate

Crime Score

46/ 100

Elevated

Walkability

65/ 100

Moderate

Transit & Bike

Transit 49Bike 67

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesListing checked 6 Nov 2026

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

Valuation edge0/15
claims [AVM -5.9% (HIGH)] → 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 (HIGH confidence) · snapshot 9 Nov 2026
- valuation_snapshotsestimate for 100021574897· as of 9 Nov 2026
Rental economics1/40
gross yield 5.1%; range width penalty ×0.87
- valuation_snapshotsrent estimate 3000/mo (range 2750-3250)· as of 9 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -878/mo, -29% of rent (6.75% on a 75% loan; no service charge or ground rent disclosed); fails the stress - earns nothing
- underwriting_assumptionscosts not disclosed by the advert· as of 6 Nov 2026
Seller motivationNot scored
context, not scored: 0 price cut(s), 280 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 6 Nov 2026
Risk & liquidity14.6/15
267 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

£525,000£805,000

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£699,950

At the asking price

Monthly rent£3,000/mo

Evidenced range £2,750-£3,250

Interest rate5.4%

Loan to value75%

Cash required: £236,283
Net cash flow: -£285/mo
Cash on cash: -1.4%
Score at this price: 16

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.27 - 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 100021574897Valuation edge · as of 9 Nov 2026
valuation_snapshotsrent estimate 3000/mo (range 2750-3250)Rental economics · as of 9 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 6 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 6 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 3000/mo (range 2750-3250)
Seller motivation could not be scored
context, not scored: 0 price cut(s), 280 days on market; homes with a cut sold 0.2-0.3pp further below the cut ask, which is not an edge

Property risk deep-dive →

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£661,000

Rent Estimate (pcm)£3,000

Gross Yield5.14%

1y Growth-

3y Growth-0.6%

5y Growth+0.2%

10y Growth+1.2%

Last Sold Price£83,000 (1997-09-16)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0TW7 5BU

Approval Rate

-12mo

Development

low

P/2026/3075
Erection of a rear roof extension with five roof windows to the house.
Pending
P/2026/2971
Details of Condition 3 (Vehicle Tracking and Junction Geometry), submitted pursuant to permission P/2026/1294 dated 08/09/2026 for Prior Approval for Installation of external bollards, enlargement of the existing cycle storage and relocation of approved car parking for the development of planning permission P/2022/2424.
Pending
P/2026/2959
Erection of a front porch extension.
Pending

View Planning Timeline