Basement and Ground Floor Flat, 99 Oakley Street, London, SW3 5NR

UPRN:217060031Converted Flat2 bedsBuilt -

LeaseholdCouncil Tax: -EPC: -

Data freshness:Listing· freshPrice Paid· freshPlanning· freshRisk· 5mo agoConnectivity· 1mo agoSchools· freshAmenities· 1mo agoArea· Census 2021

Basement and Ground Floor Flat, 99 Oakley Street, London, SW3 5NR

HP Score

/ 100

Strong

Verdict

today

Verdict: INVESTIGATE, on a scale of Buy, Investigate, Avoid.
Strong fundamentals; flood risk not assessed

Evidence

17 of 21 sources

Sale Estimate

£1,256,000

£1.00M - £1.51MLow

Estimate

£1.26M

Range

£1.00M – £1.51M

Rent Estimate (pcm)

£5,700

£5k - £6k

Monthly

£5,700

Yield

3.91%

Verdict

Derived from HomePortfolio scores

Basement and Ground Floor Flat earns an INVESTIGATE rating with HP Score 80/100. Investment score 64/100 reflects moderate fundamentals. Crime intensity is low. Walkability is excellent (97/100). 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 NationsMarket 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 company ownershipHM Land Registry covenantsHM Land Registry leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

80/ 100

Strong

Investment Score

64/ 100

Moderate

Crime Score

26/ 100

Moderate

Walkability

97/ 100

Excellent

Transit & Bike

Transit 61Bike 73

Walk Score, out of 100

Opportunity

Not scored as an opportunity

We will not put a number on this one.

headline score requires valuation_edge (estimate confidence LOW below scoring floor)

What we could establish

Rental economics0/40
gross yield 3.9%; range width penalty ×0.85
- valuation_snapshotsrent estimate 5700/mo (range 5200-6200)· as of 10 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -3,323/mo, -58% 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 5 Nov 2026· verify before relying on this
Risk & liquidity9.2/15
190 sales/12mo in area; valuation range width 40%
- property_intelligencetransactions_12mo

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£1,750,000

At the asking price

Monthly rent£5,700/mo

Evidenced range £5,200-£6,200

Interest rate5.4%

Loan to value75%

Cash required: £650,050
Net cash flow: -£1,960/mo
Cash on cash: -3.6%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.97 - 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_snapshotsrent estimate 5700/mo (range 5200-6200)Rental economics · as of 10 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 5 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 5 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
Valuation edge could not be scored
estimate confidence LOW below scoring floor
Rental economics needs verification before you rely on it
rent estimate 5700/mo (range 5200-6200)

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. Fill the valuation edge gap before relying on the score.
estimate confidence LOW below scoring floor
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£1,256,000

Rent Estimate (pcm)£5,700

Gross Yield3.91%

1y Growth+1466.9%

3y Growth-9.5%

5y Growth-4.5%

10y Growth-2.4%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseHigh

View Full Risk Report

Planning Activity

Recent Apps

1SW3 5NR

Approval Rate

0%12mo

Development

low

2026/3174
Erection of single storey rear extension.
Pending
2026/3002
Rear Garden T1 - Cherry Fell to ground level and replant with Prunus avium Plena (Double White Cherry Blossom Tree) . Tree is a mature and leaning towards property, tree is too established to re-stake. Felling and replanting will abate problems
Pending
2026/2950
Details of written scheme of investigation; cycle parking details; CEMP; BNG plan and statutory metric; future district heating network connection feasibility study, obscure glazing and site levels pursuant to conditions 3, 11, 20, 23, 25, 46 and 48 of planning permission dated 11/06/2026 ref 2025/0799 (Erection of a two-storey extension above the front part of the southern building facing Howie Street and the erection of a part four and part eight storey extension to the central and northern part of the building fronting Elcho Street including a new basement, to provide additional floor space (Use Class E(g)(ii)(Research and development of products or processes)) and associated ancillary floorspace.)
Pending

View Planning Timeline