Flat 13, Altayyar House, 102 Marsham Street, London, SW1P 4EL

UPRN:10033627067Flat/Maisonette2 bedsBuilt 2012 onwards

LeaseholdCouncil Tax: Band GEPC: C (78)

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

Flat 13, Altayyar House, 102 Marsham Street, London, SW1P 4EL

HP Score

/ 100

Strong

Verdict

yesterday

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

Evidence

20 of 21 sources

Sale Estimate

£771,000

£616k - £925kLow

Estimate

£771k

Range

£616k – £925k

Rent Estimate (pcm)

£3,300

£3k - £4k

Monthly

£3,300

Yield

4.66%

Verdict

Derived from HomePortfolio scores

Flat 13 earns an INVESTIGATE rating with HP Score 82/100. Investment score 71/100 reflects strong 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 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

82/ 100

Strong

Investment Score

71/ 100

High

Crime Score

26/ 100

Moderate

Walkability

97/ 100

Excellent

Transit & Bike

Transit 100Bike 76

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence1 independent sourceLead to verifyListing checked 5 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 edge2.5/15
claims [sold-comps +16.7%, £/sqft +16.7%] → measured edge +0.50pp of the ask; on later-registered sales an AVM discount carried no edge and a sold-evidence gap at most +0.5pp; AVM excluded (estimate confidence LOW below scoring floor)
estimate confidence LOW below scoring floor · snapshot 9 Nov 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.4%· as of 5 Nov 2026
Rental economics0/40
gross yield 4.7%; range width penalty ×0.81
- valuation_snapshotsrent estimate 3300/mo (range 2950-3600)· as of 9 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,290/mo, -39% 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
Seller motivationNot scored
context, not scored: 0 price cut(s), 46 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 5 Nov 2026
Risk & liquidity9.2/15
89 sales/12mo in area; valuation range width 40%
- 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

£637,500£977,500

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£850,000

At the asking price

Monthly rent£3,300/mo

Evidenced range £2,950-£3,600

Interest rate5.4%

Loan to value75%

Cash required: £288,800
Net cash flow: -£584/mo
Cash on cash: -2.4%
Score at this price: 12

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.15 - 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

property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.4%Valuation edge · as of 5 Nov 2026
valuation_snapshotsrent estimate 3300/mo (range 2950-3600)Rental economics · as of 9 Nov 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

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 3300/mo (range 2950-3600)
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£771,000

Rent Estimate (pcm)£3,300

Gross Yield4.66%

1y Growth-11.2%

3y Growth-13.8%

5y Growth+0.3%

10y Growth-5.1%

Last Sold Price£1,075,000 (2024-07-05)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseHigh

View Full Risk Report

Planning Activity

Recent Apps

0SW1P 4EL

Approval Rate

-12mo

Development

low

26/07403/FULL
Refurbishment and enhancement of the building to facilitate its continued use as offices with ancillary residential accommodation, together with associated conservation, restoration, accessibility improvements, building services upgrades, landscaping and ancillary works. Internal and external alterations associated with the repair. (Linked with 26/07404/LBC)
Pending
26/07412/FULL
Installation of Automatic Opening Vents as part of essential fire strategy.
Pending
26/07411/ADFULL
Details of air quality assessment pursuant to Condition 2 of planning permission dated 1 August 2025 (RN: 25/04054/FULL).
Pending

View Planning Timeline

Ownership

Corporate Ownership21.5%
Overseas OwnershipNo
Lease Term Remaining999+ yrs
CovenantsRestrictive
Lease TypeLeasehold
Last Ownership Change2024-07-05
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

18 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£45,172

Population Density13,692 /km²

Owner Occupied35%

Age Distribution

0-15 14%16-64 75%65+ 11%

View Area Profile

Schools Nearby

Burdett-Coutts and Townshend Foundation CofE Primary School
0.2 mi
Good
Millbank Gardens Primary Academy
0.2 mi
Inspected as Churchill Gardens Primary Academy (URN 139940) on 27 Jun 2023
The Grey Coat Hospital
0.2 mi
Outstanding
Westminster Under School
0.2 mi
Inspected by ISI

2 of 8 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Altayyar House, 102 Marsham Street
-
£690k
-
Altayyar House, 102 Marsham Street
-
£1.07M
-
Altayyar House, 102 Marsham Street
-
£1.07M
-
Altayyar House, 102 Marsham Street
-
£1.05M
-

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