21 Clare Street, Cardiff, CF11 6BD

UPRN:100100076313Mid Terrace House8 bedsBuilt 1900-1929

FreeholdCouncil Tax: -EPC: D (61)

Data freshness:Listing· freshPlanning· 4mo agoEPC· 6mo agoRisk· 2y agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

HP Score

/ 100

Mixed

Verdict

5 days ago

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

Evidence

17 of 21 sources

Sale Estimate

£377,000

£339k - £415kMedium

Estimate

£377k

Range

£339k – £415k

Rent Estimate (pcm)

£1,600

£1k - £2k

Monthly

£1,600

Yield

4.00%

Verdict

Derived from HomePortfolio scores

21 Clare Street earns an INVESTIGATE rating with HP Score 65/100. Investment score 64/100 reflects moderate fundamentals. Crime intensity is moderate. Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Tenure is freehold. 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)ONS 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

65/ 100

Mixed

Investment Score

64/ 100

Moderate

Crime Score

54/ 100

Elevated

Walkability

No data

Transit & Bike

No data

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesListing checked 3 Nov 2026

This rests largely on a single source. Treat the score as a prompt to investigate, not a conclusion.

Valuation edge-0.6/15
claims [AVM -27.3% (MEDIUM)] → 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 12 Oct 2026
- valuation_snapshotsestimate for 100100076313· as of 12 Oct 2026
Rental economics0/40
gross yield 4.0%; range width penalty ×0.82
- valuation_snapshotsrent estimate 1600/mo (range 1450-1750)· as of 12 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -979/mo, -61% of rent (6.75% on a 75% loan; no service charge or ground rent disclosed); fails the stress - earns nothing
- underwriting_assumptionscosts not disclosed by the advert· as of 3 Nov 2026
Seller motivationNot scored
no listing-history inputs (first published date, price changes)
Risk & liquidity12.8/15
431 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

£360,000£552,000

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£480,000

At the asking price

Monthly rent£1,600/mo

Evidenced range £1,450-£1,750

Interest rate5.4%

Loan to value75%

Cash required: £159,300
Net cash flow: -£512/mo
Cash on cash: -3.9%
Score at this price: 12

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.99 - 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 100100076313Valuation edge · as of 12 Oct 2026
valuation_snapshotsrent estimate 1600/mo (range 1450-1750)Rental economics · as of 12 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 3 Nov 2026
property_intelligencetransactions_12moRisk & liquidity

Sold comparables in depth Valuation methodology

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 1600/mo (range 1450-1750)
Seller motivation could not be scored
no listing-history inputs (first published date, price changes)

Property risk deep-dive →flood, subsidence, crime, environment - the full domain

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£377,000

Rent Estimate (pcm)£1,600

Gross Yield4.00%

1y Growth-

3y Growth+0.9%

5y Growth+2.9%

10y Growth+3.6%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

0CF11 6BD

Approval Rate

-12mo

Development

low

26/02289/LBC
Change of use of floors 1 - 6 of Elgin House from offices (Use Class B1) to an aparthotel (Use Class C2), with associated internal works.
Pending
26/02270/FUL
Removal of small monopitch roof to the rear of the ground floor and replacement with small, flat roof extension with rooflight, and the addition of full width, sliding glass doors, to replace the existing french doors
Pending
26/02246/FUL
Change of use from A1 retail to A3 restaurant
Pending

View Planning Timeline