21 Elmfield Mansions, Elmfield Road, London, SW17 8AA

UPRN:100022638076Purpose Built Flat3 bedsBuilt before 1900

LeaseholdCouncil Tax: Band DEPC: C (79)

Data freshness:Listing· freshPlanning· 4mo agoOwnership· freshEPC· 6mo agoRisk· 5mo agoCrime· freshConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021Council Tax· 6mo ago

21 Elmfield Mansions, Elmfield Road, London, SW17 8AA

HP Score

/ 100

Strong

Verdict

yesterday

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

Evidence

20 of 21 sources

Sale Estimate

£694,000

£659k - £729kHigh

Estimate

£694k

Range

£659k – £729k

Rent Estimate (pcm)

£3,250

£3k - £4k

Monthly

£3,250

Yield

6.00%

Verdict

Derived from HomePortfolio scores

21 Elmfield Mansions earns an INVESTIGATE rating with HP Score 76/100. Investment score 70/100 reflects strong fundamentals. Crime intensity is moderate. Walkability is excellent (92/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Tenure is leasehold. 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 addressDefra strategic noise mapping, England Round 4 (Contains Defra data © Crown copyright and database right 2023-2024, Open Government Licence v3.0)Walk ScoreONS 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

76/ 100

Strong

Investment Score

70/ 100

High

Crime Score

47/ 100

Elevated

Walkability

92/ 100

Excellent

Transit & Bike

Transit 49Bike 65

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence1 independent sourceLead to verifyListing checked 12 Nov 2026

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

Check before relying on this score: leasehold with no service charge disclosed - the stress test assumes GBP 0. It ranks after every home whose inputs are verified.

Valuation edge1.9/15
claims [AVM +6.3% (HIGH), sold-comps +2.3%, £/sqft +2.3%] → measured edge +0.38pp of the ask; on later-registered sales an AVM discount carried no edge and a sold-evidence gap at most +0.5pp
Market estimate used (HIGH confidence) · snapshot 13 Oct 2026
- valuation_snapshotsestimate for 100022638076· as of 13 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 23.3%· as of 1 Nov 2026
Rental economics6.9/40
gross yield 6.0%; range width penalty ×0.86
- valuation_snapshotsrent estimate 3250/mo (range 3000-3550)· as of 13 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -483/mo, -15% of rent (6.75% on a 75% loan; no service charge or ground rent disclosed); fails the stress - earns nothing; leasehold with no service charge disclosed - the stress assumes GBP 0
- underwriting_assumptionscosts not disclosed by the advert· as of 12 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 59 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 12 Nov 2026
Risk & liquidity14.6/15
646 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

£487,500£747,500

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£650,000

At the asking price

Monthly rent£3,250/mo

Evidenced range £3,000-£3,550

Interest rate5.4%

Loan to value75%

Cash required: £218,800
Net cash flow: £56/mo
Cash on cash: 0.3%
Score at this price: 23

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.48 - 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 100022638076Valuation edge · as of 13 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 23.3%Valuation edge · as of 1 Nov 2026
valuation_snapshotsrent estimate 3250/mo (range 3000-3550)Rental economics · as of 13 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 12 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 12 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 3250/mo (range 3000-3550)
Stress margin needs verification before you rely on it
costs not disclosed by the advert

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. Treat the gap to the estimate as unproven - compare recent sold prices on the street yourself before pricing an offer around it.
On later completions, homes listed below their estimate sold at the same share of the asking price as the rest.
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£694,000

Rent Estimate (pcm)£3,250

Gross Yield6.00%

1y Growth-

3y Growth+0.3%

5y Growth+0.2%

10y Growth+0.8%

Last Sold Price£188,500 (2008-12-18)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0SW17 8AA

Approval Rate

-12mo

Development

low

PA2026/0877
T1 - Liquid Amber Fell as close to ground level as possible. Apply systemic herbicide to stump to prevent re-growth. T2 - Magnolia Sever ivy and reduce back from footpath by up to 1.5 metres of branch length Rear Garden T3 - Black Poplar Remove major deadwood and snapped branch stus. T4 - Yew Remove epicormic growth to crown break and remove 1.5 metres of branch length over patio T5 - Acacia Remove 1.56 metres of lowest branch on left side of the tree. • To allow retention of the tree within the available space for growth • The works will encourage a well-balanced crown for future years • Its proximity to the property is casing anxiety and apprehension to the occupier It is a large dominant tree in close proximity to the property.
Pending
PA2026/0870
Japanese Privet - Reduce crown by approx 2-3m and lift canopy over pavement as required Bay - Reduce crown by approx 2-3m and lift canopy over pavement as required
Pending
PA2026/0863
TPO 150/1994 T55 [ON APP AS T1]- Large London plane tree - repollard back to previous points.
Decision level tpo

View Planning Timeline