17 Derwen Road, Alltwen, Pontardawe, Swansea, SA8 3AU

UPRN:100100625908Detached House4 bedsBuilt before 1900

FreeholdCouncil Tax: -EPC: E (47)

Data freshness:Listing· freshOwnership· freshEPC· 6mo agoRisk· 2y agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

17 Derwen Road, Alltwen, Pontardawe, Swansea, SA8 3AU

HP Score

/ 100

Strong

Verdict

today

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

Evidence

17 of 21 sources

Sale Estimate

£242,000

£194k - £290kLow

Estimate

£242k

Range

£194k – £290k

Rent Estimate (pcm)

£1,150

£1k - £1k

Monthly

£1,150

Yield

3.56%

Verdict

Derived from HomePortfolio scores

17 Derwen Road earns an INVESTIGATE rating with HP Score 81/100. Investment score 73/100 reflects strong 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 company ownershipHM Land Registry covenantsHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

81/ 100

Strong

Investment Score

73/ 100

High

Crime Score

23/ 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 economics0/40
gross yield 3.6%; range width penalty ×0.94
- valuation_snapshotsrent estimate 1150/mo (range 1100-1250)· as of 10 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -921/mo, -80% 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 5 Nov 2026
Risk & liquidity9.3/15
113 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£387,950

At the asking price

Monthly rent£1,150/mo

Evidenced range £1,100-£1,250

Interest rate5.4%

Loan to value75%

Cash required: £127,083
Net cash flow: -£513/mo
Cash on cash: -4.8%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.88 - 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_snapshotsrent estimate 1150/mo (range 1100-1250)Rental economics · as of 10 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 5 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 5 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 1150/mo (range 1100-1250)

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. Ask the agent why the price was reduced and whether a previous sale fell through.
1 price cut(s) recorded on the listing history.
3. Fill the valuation edge gap before relying on the score.
estimate confidence LOW below scoring floor
4. 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£242,000

Rent Estimate (pcm)£1,150

Gross Yield3.56%

1y Growth-

3y Growth-0.9%

5y Growth+3.3%

10y Growth+3.2%

Last Sold Price£105,000 (2006-06-23)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceLow
RadonModerate
MiningUnknown
LandslideModerate
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

1SA8 3AU

Approval Rate

-12mo

Development

low

P2026/0667
Proposed first floor balcony to rear of property
Pending
P2026/0631
Proposed single storey side extension and raised patio to rear including demolition of small outbuilding
Pending
P2026/0539
Demolition of the existing retaining wall and construction of a replacement retaining wall set approximately 2.5 metres from the rear elevation of the host dwelling.
Approved

View Planning Timeline