Apartment 406, Western Building, 3 Triptych Place, London, SE1 9FL

UPRN:10096039461Flat/Maisonette2 bedsBuilt 2023

LeaseholdCouncil Tax: Band GEPC: B (86)

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

Apartment 406, Western Building, 3 Triptych Place, London, SE1 9FL

HP Score

/ 100

Strong

Verdict

yesterday

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

Evidence

19 of 21 sources

Sale Estimate

£1,784,000

£1.61M - £1.96MMedium

Estimate

£1.78M

Range

£1.61M – £1.96M

Rent Estimate (pcm)

£8,400

£8k - £9k

Monthly

£8,400

Yield

5.60%

Verdict

Derived from HomePortfolio scores

Apartment 406 earns an INVESTIGATE rating with HP Score 77/100. Investment score 74/100 reflects strong fundamentals. Crime intensity is moderate. Walkability is excellent (98/100). 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 NationsMarket 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

77/ 100

Strong

Investment Score

74/ 100

High

Crime Score

49/ 100

Elevated

Walkability

98/ 100

Excellent

Transit & Bike

Transit 100Bike 81

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence1 independent sourceLead to verifyListing checked 4 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 edge1.4/15
claims [AVM -0.9% (MEDIUM), sold-comps +1.7%, £/sqft +1.7%] → measured edge +0.29pp 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 13 Oct 2026
- valuation_snapshotsestimate for 10096039461· as of 13 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 8.4%· as of 24 Oct 2026
Rental economics4.2/40
gross yield 5.6%; range width penalty ×0.87
- valuation_snapshotsrent estimate 8400/mo (range 7700-9100)· as of 13 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,550/mo, -18% 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 4 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 31 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 4 Nov 2026
Risk & liquidity12.8/15
555 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

£1,350,000£1,980,000

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£1,800,000

At the asking price

Monthly rent£8,400/mo

Evidenced range £7,700-£9,100

Interest rate5.4%

Loan to value75%

Cash required: £671,050
Net cash flow: -£260/mo
Cash on cash: -0.5%
Score at this price: 18

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.38 - 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 10096039461Valuation edge · as of 13 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 8.4%Valuation edge · as of 24 Oct 2026
valuation_snapshotsrent estimate 8400/mo (range 7700-9100)Rental economics · as of 13 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 4 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 4 Nov 2026

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 8400/mo (range 7700-9100)
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£1,784,000

Rent Estimate (pcm)£8,400

Gross Yield5.60%

1y Growth-3.3%

3y Growth-7.8%

5y Growth-4.1%

10y Growth-1.2%

Last Sold Price£1,795,000 (2023-10-13)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0SE1 9FL

Approval Rate

-12mo

Development

low

26/01548/NMA
Non-Material Amendment under S96A of the Town and Country Planning Act 1990 (as amended) to planning permission 24/00535/FULL dated 24th April 2025 to amend the wording of (33) SuDS.
Pending
26/AP/3217
Details of condition 9 part 4 (Archaeological Public Engagement Programme) as required by planning permission ref. 21/AP/4194 dated 20/03/2024 for 'Redevelopment of existing building including partial demolition and two storey upward extension to create eight-storey Class E building with installation of roof terraces, associated highway and landscaping works, cycle parking, refuse storage including plant facilities at roof level'.
Pending
26/01547/NMA
Non-Material Amendment under S96A of the Town and Country Planning Act 1990 (as amended) to planning permission 24/00535/FULL dated 24th April 2025 to amend the trigger of Condition (2) Circular Economy Statement.
Pending

View Planning Timeline

Ownership

Corporate Ownership24.3%
Overseas OwnershipNo
Lease Term Remaining-
CovenantsRestrictive
Lease TypeLeasehold
Last Ownership Change2023-10-13
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

15 Mbps

Mobile 4G/5G Coverage

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£43,006

Population Density9,067 /km²

Owner Occupied15%

Age Distribution

0-15 15%16-64 76%65+ 9%

View Area Profile

Schools Nearby

City of London School
0.3 mi
Inspected by ISI
Haberdashers' Borough Academy
0.4 mi
Good
The Cathedral School of St Saviour and St Mary Overie
0.4 mi
Outstanding
London Nautical, City of London Academy
0.4 mi
Inspected as London Nautical School (URN 100642) on 22 Jun 2023

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

View All Schools

Comparables

View All

Western Building, 3 Triptych Place
-
£1.77M
-
Western Building, 3 Triptych Place
-
£2.00M
-
Western Building, 3 Triptych Place
-
£1.70M
-
Western Building, 3 Triptych Place
-
£2.87M
-

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