C121, Capital Building, 8 New Union Square, London, SW11 7AR

UPRN:10091502986Purpose Built Flat2 bedsBuilt -

LeaseholdCouncil Tax: Band GEPC: B (83)

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

C121, Capital Building, 8 New Union Square, London, SW11 7AR

HP Score

/ 100

Mixed

Verdict

yesterday

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

Evidence

20 of 21 sources

Sale Estimate

£941,000

£847k - £1.03MMedium

Estimate

£941k

Range

£847k – £1.03M

Rent Estimate (pcm)

£4,500

£4k - £5k

Monthly

£4,500

Yield

5.14%

Verdict

Derived from HomePortfolio scores

C121 earns an INVESTIGATE rating with HP Score 74/100. Investment score 71/100 reflects strong fundamentals. Crime intensity is moderate. Walkability is limited (68/100). 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

74/ 100

Mixed

Investment Score

71/ 100

High

Crime Score

42/ 100

Elevated

Walkability

68/ 100

Moderate

Transit & Bike

Transit 43Bike 71

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead 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 edge-0.6/15
claims [AVM -11.6% (MEDIUM), sold-comps -19.9%, £/sqft -19.8%] → measured edge -0.12pp 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 (MEDIUM confidence) · snapshot 9 Oct 2026
- valuation_snapshotsestimate for 10091502986· as of 9 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.2%· as of 21 Oct 2026
Rental economics1/40
gross yield 5.1%; range width penalty ×0.87
- valuation_snapshotsrent estimate 4500/mo (range 4100-4850)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,252/mo, -28% 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), 58 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
774 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

£787,500£1,207,500

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£1,050,000

At the asking price

Monthly rent£4,500/mo

Evidenced range £4,100-£4,850

Interest rate5.4%

Loan to value75%

Cash required: £365,050
Net cash flow: -£428/mo
Cash on cash: -1.4%
Score at this price: 13

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.27 - 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 10091502986Valuation edge · as of 9 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 13.2%Valuation edge · as of 21 Oct 2026
valuation_snapshotsrent estimate 4500/mo (range 4100-4850)Rental economics · as of 9 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 4500/mo (range 4100-4850)
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£941,000

Rent Estimate (pcm)£4,500

Gross Yield5.14%

1y Growth-8.6%

3y Growth-4.7%

5y Growth-0.1%

10y Growth-0.5%

Last Sold Price£825,000 (2016-03-21)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseHigh

View Full Risk Report

Planning Activity

Recent Apps

0SW11 7AR

Approval Rate

-12mo

Development

low

26/07388/ADFULL
Detailed drawings of all new windows and external doors; pursuant to condition 4 of planning permission dated 23rd July 2026 (26/02493/FULL)
Pending
26/07387/ADFULL
Samples of the facing materials, including detailed drawings of the dormers, and windows including section drawings showing the glazing bars; pursuant to condition 3 and 4 of planning permission dated 4th September 2026 (26/04924/FULL)
Pending
26/07386/ADFULL
Details of Window, including section drawings showing the glazing bars; Door, including section drawings showing the glazing bars; Awning; pursuant to condition 3 (a, b, and c) of planning permission dated 4th September 2026 (26/04925/FULL)
Pending

View Planning Timeline

Ownership

Corporate Ownership42.3%
Overseas OwnershipNo
Lease Term Remaining999+ yrs
CovenantsRestrictive
Lease TypeLeasehold
Last Ownership Change2016-03-21
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

12 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£49,310

Population Density-

Owner Occupied18%

Age Distribution

0-15 12%16-64 86%65+ 2%

View Area Profile

Schools Nearby

St Gabriel's CofE Primary School
0.3 mi
Good
Tachbrook Nursery School
0.3 mi
Area grades2025
Inspected after Ofsted withdrew the single overall grade.
Pimlico Academy
0.4 mi
Report card2026
Ofsted no longer awards a single overall grade.
Pimlico Primary
0.4 mi
Area grades2025
Inspected after Ofsted withdrew the single overall grade.

1 of 10 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Capital Building, 8 New Union Square
-
£945k
-
Capital Building, 8 New Union Square
-
£1.02M
-
Capital Building, 8 New Union Square
-
£980k
-
Capital Building, 8 New Union Square
-
£1.13M
-

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