41 Castle Avenue, Penarth, CF64 3QY

UPRN:100100837331Semi-Detached House4 bedsBuilt 1950-1966

FreeholdCouncil Tax: Band EEPC: C (70)

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

HP Score

/ 100

Strong

Verdict

2 days ago

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

Evidence

16 of 21 sources

Sale Estimate

£402,000

£382k - £422kHigh

Estimate

£402k

Range

£382k – £422k

Rent Estimate (pcm)

£1,700

£2k - £2k

Monthly

£1,700

Yield

3.81%

Verdict

Derived from HomePortfolio scores

41 Castle Avenue earns an INVESTIGATE rating with HP Score 84/100. Investment score 67/100 reflects moderate fundamentals. Crime intensity is very low. 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)HM Land Registry sales matched to addressONS Census 2021Police.ukHM Land Registry company ownershipHM Land Registry covenantsHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

84/ 100

Strong

Investment Score

67/ 100

Moderate

Crime Score

8/ 100

Low

Walkability

No data

Transit & Bike

No data

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesListing checked 4 Nov 2026

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

Valuation edge-1.6/15
claims [AVM -33.1% (HIGH), sold-comps -31.8%, £/sqft -31.7%] → 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 100100837331· as of 9 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 6 comps, dispersion 19.9%· as of 26 Oct 2026
Rental economics0/40
gross yield 3.8%; range width penalty ×0.91
- valuation_snapshotsrent estimate 1700/mo (range 1600-1850)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,138/mo, -67% 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 4 Nov 2026
Seller motivationNot scored
context, not scored: 0 price cut(s), 71 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 & liquidity14.6/15
404 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

£401,000£615,000

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£535,000

At the asking price

Monthly rent£1,700/mo

Evidenced range £1,600-£1,850

Interest rate5.4%

Loan to value75%

Cash required: £178,550
Net cash flow: -£629/mo
Cash on cash: -4.2%
Score at this price: 13

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.94 - 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 100100837331Valuation edge · as of 9 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 6 comps, dispersion 19.9%Valuation edge · as of 26 Oct 2026
valuation_snapshotsrent estimate 1700/mo (range 1600-1850)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
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 1700/mo (range 1600-1850)
Seller motivation could not be scored
context, not scored: 0 price cut(s), 71 days on market; homes with a cut sold 0.2-0.3pp further below the cut ask, which is not an edge

Property risk deep-dive →

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£402,000

Rent Estimate (pcm)£1,700

Gross Yield3.81%

1y Growth-

3y Growth+0.6%

5y Growth+2.0%

10y Growth+3.7%

Last Sold Price£250,000 (2014-10-30)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

0CF64 3QY

Approval Rate

-12mo

Development

low

2025/00914/FUL
External and Internal alterations to the existing dwelling, including conversion of garage and partial cladding
Approved
2025/00258/TPO
Work to Tree covered by Tree Preservation Order 1988 No. 01 : Sycamore - Reduce/ pollard height back to previous points but tidy up points, and reduce sides in to new pollard points approximately 1m inside previous points to shape
Approved
2024/01178/FUL
Single storey rear extension and enlargement of front porch
Approved

View Planning Timeline