5 Tai Derwen, Cefn Mably, Cardiff, CF3 6XR

UPRN:43068557Detached House3 bedsBuilt 1930-1949

FreeholdCouncil Tax: -EPC: D (57)

Data freshness:Listing· freshPrice Paid· freshPlanning· 4mo agoEPC· 3mo agoRisk· 2y agoConnectivity· 1mo agoSchools· 4mo agoAmenities· 1mo agoArea· Census 2021

5 Tai Derwen, Cefn Mably, Cardiff, CF3 6XR

HP Score

/ 100

Mixed

Verdict

3 days ago

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

Evidence

16 of 21 sources

Sale Estimate

£440,000

£352k - £528kLow

Estimate

£440k

Range

£352k – £528k

Rent Estimate (pcm)

£2,250

£2k - £2k

Monthly

£2,250

Yield

5.45%

Verdict

Derived from HomePortfolio scores

5 Tai Derwen earns an INVESTIGATE rating with HP Score 70/100. Investment score 61/100 reflects moderate fundamentals. Crime intensity is 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 covenantsHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

70/ 100

Mixed

Investment Score

61/ 100

Moderate

Crime Score

29/ 100

Moderate

Walkability

No data

Transit & Bike

No data

Opportunity

Not scored as an opportunity

We will not put a number on this one.

headline score requires valuation_edge (estimate confidence LOW below scoring floor)

What we could establish

Rental economics3.4/40
gross yield 5.5%; range width penalty ×0.93
- valuation_snapshotsrent estimate 2250/mo (range 2100-2400)· as of 12 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -565/mo, -25% 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 2 Nov 2026
Risk & liquidity9.2/15
404 sales/12mo in area; valuation range width 40%
- property_intelligencetransactions_12mo

Withholding a score is deliberate. A number built on missing or stale inputs would look more certain than the evidence allows.

Economics

What happens to your money

Your assumptions

Purchase price£495,000

At the asking price

Monthly rent£2,250/mo

Evidenced range £2,100-£2,400

Interest rate5.4%

Loan to value75%

Cash required: £164,550
Net cash flow: -£113/mo
Cash on cash: -0.8%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.35 - 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_snapshotsrent estimate 2250/mo (range 2100-2400)Rental economics · as of 12 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 2 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 2 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
Valuation edge could not be scored
estimate confidence LOW below scoring floor
Rental economics needs verification before you rely on it
rent estimate 2250/mo (range 2100-2400)

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. Fill the valuation edge gap before relying on the score.
estimate confidence LOW below scoring floor
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£440,000

Rent Estimate (pcm)£2,250

Gross Yield5.45%

1y Growth-

3y Growth+0.6%

5y Growth+3.0%

10y Growth+5.3%

Last Sold Price£237,000 (2008-07-04)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceLow
RadonModerate
MiningLow
LandslideModerate
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

0CF3 6XR

Approval Rate

-12mo

Development

low

26/0562
ERECTION OF LEAN-TO BARN
Conditions
26/0338/RET
Retain hard surface area for the purposes of storage of agricultural equipment, hay, straw and other ancillary crops, and storage in relation to Cefn Mably Farm Park
Pending
26/0097/NOTAF
Erect agricultural building
Approved

View Planning Timeline