42 Mariner Street, Swansea, SA1 5BA

UPRN:100100358318Terrace Property3 bedsBuilt 1900-1929

FreeholdCouncil Tax: -EPC: E (50)

Data freshness:Listing· freshPlanning· 4mo agoOwnership· freshEPC· 6mo agoRisk· 2y agoCrime· freshConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

HP Score

/ 100

Mixed

Verdict

2 days ago

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

Evidence

18 of 21 sources

Sale Estimate

£103,000

£82k - £123kLow

Estimate

£103k

Range

£82k – £123k

Rent Estimate (pcm)

£650

£650 - £700

Monthly

£650

Yield

0.99%

Verdict

Derived from HomePortfolio scores

42 Mariner Street earns an INVESTIGATE rating with HP Score 45/100. Investment score 58/100 reflects moderate fundamentals. Crime intensity is elevated. 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

45/ 100

Mixed

Investment Score

58/ 100

Moderate

100

Crime Score

100/ 100

Elevated

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 1.0%; range width penalty ×1.00
- valuation_snapshotsrent estimate 650/mo (range 650-700)· as of 14 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -2,964/mo, -456% 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 11 Nov 2026
Risk & liquidity9.3/15
446 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£785,000

At the asking price

Monthly rent£650/mo

Evidenced range £650-£700

Interest rate5.4%

Loan to value75%

Cash required: £266,050
Net cash flow: -£2,199/mo
Cash on cash: -9.9%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.25 - 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 650/mo (range 650-700)Rental economics · as of 14 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 11 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 11 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 650/mo (range 650-700)

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£103,000

Rent Estimate (pcm)£650

Gross Yield0.99%

1y Growth-

3y Growth+1.2%

5y Growth+1.5%

10y Growth+2.0%

Last Sold Price£80,000 (2020-09-23)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceLow
RadonModerate
MiningUnknown
LandslideModerate
Air QualityLow
NoiseWithheld

View Full Risk Report

Planning Activity

Recent Apps

0SA1 5BA

Approval Rate

-12mo

Development

low

2026/1854/LBC
Repair and replacement of the existing roof to the main museum building and south-east toilet block (application for Listed Building Consent)
Pending
2026/1812/S73
Provision of roof extension and pergola to facilitate access to new roof terrace areas - Variation of Condition 01 of Planning Permission 2021/1943/FUL granted 15/12/2021 to allow an extenson of time in which to implement the permission.
Pending
2026/1792/FUL
Change of use from a house in multiple occupation (Use Class C4), to a 7-bedroom, 7-person house in multiple occupation (Unique Use), with associated internal and external alterations, bin store and covered cycle store.
Pending

View Planning Timeline