Flat 3, 23 Onslow Square, London, SW7 3NJ

UPRN:217062170Flat/Maisonette3 bedsBuilt 1900-1929

LeaseholdCouncil Tax: -EPC: C (75)

Data freshness:Price Paid· freshPlanning· 4mo agoEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 1mo agoArea· Census 2021

Flat 3, 23 Onslow Square, London, SW7 3NJ

HP Score

/ 100

Mixed

Verdict

4 days ago

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

Evidence

20 of 21 sources

Sale Estimate

£2,326,000

£2.09M - £2.56MMedium

Estimate

£2.33M

Range

£2.09M – £2.56M

Rent Estimate (pcm)

£8,450

£8k - £9k

Monthly

£8,450

Yield

4.51%

Verdict

Derived from HomePortfolio scores

Flat 3 earns an INVESTIGATE rating with HP Score 67/100. Investment score 71/100 reflects strong 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

67/ 100

Mixed

Investment Score

71/ 100

High

Crime Score

91/ 100

Elevated

Walkability

99/ 100

Excellent

Transit & Bike

Transit 100Bike 70

Walk Score, out of 100

Opportunity

Not scored as an opportunity

We will not put a number on this one.

asking price missing or outside scoring range

Withholding a score is deliberate. A number built on missing or stale inputs would look more certain than the evidence allows.

Economics

What happens to your money

Your assumptions

Purchase price£2,250,000

At the asking price

Monthly rent£8,450/mo

Evidenced range £7,600-£9,300

Interest rate5.4%

Loan to value75%

Cash required: £860,050
Net cash flow: -£1,744/mo
Cash on cash: -2.4%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.11 - below the usual 1.25 test. These are your assumptions, not evidence: only the pre-filled rent and price come from the record.

Risks

What could kill this deal

Score confidence is low
largely a single source - treat the number as a prompt, not a conclusion

Property risk deep-dive →flood, subsidence, crime, environment - the full domain

Plan

Before you offer

1. 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£2,326,000

Rent Estimate (pcm)£8,450

Gross Yield4.51%

1y Growth-18.6%

3y Growth-5.9%

5y Growth-3.9%

10y Growth-3.6%

Last Sold Price£2,800,000 (2023-05-19)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0SW7 3NJ

Approval Rate

-12mo

Development

low

26/07362/ADFULL
Detailed drawings of secure cycle storage for the enlarged building pursuant to condition 7 of planning permission dated 2nd April 2026 (RN 26/00738/FULL)
Pending
26/07271/FULL
Installation of temporary marquee structure on the gravelled terrace above basement level.
Pending
26/07272/LBC
Installation of 1 temporary structures (marquee) on the gravelled terrace above basement level. (Linked with 26/07271/FULL)
Pending

View Planning Timeline