Flat 17, 23 Upper Tachbrook Street, London, SW1V 1SN

UPRN:10033577611Purpose Built Flat1 bedsBuilt 2007-2011

LeaseholdCouncil Tax: Band DEPC: C (77)

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

Flat 17, 23 Upper Tachbrook Street, London, SW1V 1SN

HP Score

/ 100

Mixed

Verdict

3 days ago

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

Evidence

19 of 21 sources

Sale Estimate

£555,000

£528k - £583kHigh

Estimate

£555k

Range

£528k – £583k

Rent Estimate (pcm)

£2,700

£3k - £3k

Monthly

£2,700

Yield

4.47%

Verdict

Derived from HomePortfolio scores

Flat 17 earns an INVESTIGATE rating with HP Score 64/100. Investment score 67/100 reflects moderate 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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

64/ 100

Mixed

Investment Score

67/ 100

Moderate

100

Crime Score

100/ 100

Elevated

Walkability

99/ 100

Excellent

Transit & Bike

Transit 100Bike 74

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 28 Oct 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 edge-1.6/15
claims [AVM -30.6% (HIGH)] → measured edge -0.33pp of the ask; on later-registered sales an AVM discount carried no edge and a sold-evidence gap at most +0.5pp; asking more than 10% above the estimate (measured -0.33pp)
Market estimate used (HIGH confidence) · snapshot 9 Oct 2026
- valuation_snapshotsestimate for 10033577611· as of 9 Oct 2026
Rental economics0/40
gross yield 4.5%; range width penalty ×0.90
- valuation_snapshotsrent estimate 2700/mo (range 2500-2900)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,204/mo, -45% 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 28 Oct 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 194 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 28 Oct 2026
Risk & liquidity14.7/15
170 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

£544,000£833,500

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£725,000

At the asking price

Monthly rent£2,700/mo

Evidenced range £2,500-£2,900

Interest rate5.4%

Loan to value75%

Cash required: £245,050
Net cash flow: -£578/mo
Cash on cash: -2.8%
Score at this price: 13

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.10 - 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_snapshotsestimate for 10033577611Valuation edge · as of 9 Oct 2026
valuation_snapshotsrent estimate 2700/mo (range 2500-2900)Rental economics · as of 9 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 28 Oct 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 28 Oct 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 2700/mo (range 2500-2900)
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. 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£555,000

Rent Estimate (pcm)£2,700

Gross Yield4.47%

1y Growth-

3y Growth-3.3%

5y Growth-3.8%

10y Growth-1.8%

Last Sold Price£560,000 (2015-04-23)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseHigh

View Full Risk Report

Planning Activity

Recent Apps

0SW1V 1SN

Approval Rate

-12mo

Development

low

26/07280/FULL
Extensions and alterations to the rear elevation of existing dwelling
Pending
26/07228/ADFULL
Details of the raised boundary wall and sample panel pursuant to condition 4 of planning permission dated 30 September 2026 (RN: 26/04283/FULL).
Pending
26/07194/ADV
Display of two internally illuminated double-sided projecting signs, each measuring 0.57m × 0.67m. (Linked with 26/07193/FULL)
Pending

View Planning Timeline

Ownership

Corporate Ownership42.4%
Overseas OwnershipNo
Lease Term Remaining169 yrs
CovenantsNone
Lease TypeLeasehold
Last Ownership Change2015-04-23
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

15 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£45,172

Population Density15,860 /km²

Owner Occupied33%

Age Distribution

0-15 11%16-64 78%65+ 11%

View Area Profile

Schools Nearby

Eaton Square Prep School
0.1 mi
Inspected by ISI
St Vincent De Paul Catholic Primary School
0.2 mi
Inspected as St Vincent De Paul Catholic Primary School (URN 101144) on 4 Mar 2025
Westminster Cathedral Choir School
0.2 mi
Inspected by ISI
Burdett-Coutts and Townshend Foundation CofE Primary School
0.3 mi
Good

2 of 9 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

23 Upper Tachbrook Street
-
£249k
-
23 Upper Tachbrook Street
-
£560k
-
5 Upper Tachbrook Street
-
£850k
-
23 Upper Tachbrook Street
-
£293k
-

Boundary data not available for this property

No registered title polygon, building footprint, or street match for this property yet.

Why: No HMLR INSPIRE / OSM footprint / OS Open USRN match for this UPRN

Source: HM Land Registry INSPIRE / OpenStreetMap / OS Open USRN