66 Derwendeg Avenue, Cefn Fforest, Blackwood, NP12 3LN

UPRN:43048592Semi-Detached House3 bedsBuilt 1950-1966

FreeholdCouncil Tax: -EPC: D (62)

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

66 Derwendeg Avenue, Cefn Fforest, Blackwood, NP12 3LN

HP Score

/ 100

Mixed

Verdict

yesterday

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

Evidence

18 of 21 sources

Sale Estimate

£156,000

£148k - £164kHigh

Estimate

£156k

Range

£148k – £164k

Rent Estimate (pcm)

£800

£750 - £850

Monthly

£800

Yield

5.19%

Verdict

Derived from HomePortfolio scores

66 Derwendeg Avenue earns an INVESTIGATE rating with HP Score 70/100. Investment score 69/100 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)HM Land Registry sales matched to addressONS 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

70/ 100

Mixed

Investment Score

69/ 100

Moderate

Crime Score

40/ 100

Elevated

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 -18.6% (HIGH), sold-comps -10.8%, £/sqft -10.8%] → 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 13 Oct 2026
- valuation_snapshotsestimate for 43048592· as of 13 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 24.6%· as of 23 Oct 2026
Rental economics1.4/40
gross yield 5.2%; range width penalty ×0.95
- valuation_snapshotsrent estimate 800/mo (range 750-850)· as of 13 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -322/mo, -40% 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), 40 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
289 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

£139,000£212,500

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£185,000

At the asking price

Monthly rent£800/mo

Evidenced range £750-£850

Interest rate5.4%

Loan to value75%

Cash required: £58,000
Net cash flow: -£71/mo
Cash on cash: -1.5%
Score at this price: 14

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.28 - 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 43048592Valuation edge · as of 13 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 24.6%Valuation edge · as of 23 Oct 2026
valuation_snapshotsrent estimate 800/mo (range 750-850)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
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 800/mo (range 750-850)
Seller motivation could not be scored
context, not scored: 0 price cut(s), 40 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£156,000

Rent Estimate (pcm)£800

Gross Yield5.19%

1y Growth+40.5%

3y Growth+5.8%

5y Growth+3.7%

10y Growth+5.5%

Last Sold Price£179,000 (2022-09-09)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceLow
RadonModerate
MiningUnknown
LandslideSignificant
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

0NP12 3LN

Approval Rate

-12mo

Development

low

26/0660/NCC
Vary condition 01 (Full - time to commence dev) of Planning Consent 21/0910/NCC (Vary condition 01 of planning consent 16/0512/RM (Seek approval of the reserved matters regarding details of access, appearance, landscaping, layout and scale in regard to planning consent 12/0760/NCC (Vary condition 07 of planning permission 12/0593/NCC to allow the access location to be as indicated on drawing number 231/2C (submitted on 24th August 2009 in relation to application 09/0672/OUT) to the south of the existing dwelling)) to extend expiration period for a further 5 years)
Pending
26/0610/RET
Retain and complete the construction of a detached garage
Pending
26/0603/HH
Erect two storey side extension
Pending

View Planning Timeline