13 Lambton House, Longbourn, Windsor, SL4 3TR

UPRN:10012308520Flat/Maisonette3 bedsBuilt 1996-2002

LeaseholdCouncil Tax: Band FEPC: C (77)

Data freshness:Listing· freshPrice Paid· freshPlanning· 4mo agoOwnership· freshEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

13 Lambton House, Longbourn, Windsor, SL4 3TR

HP Score

/ 100

Strong

Verdict

yesterday

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

Evidence

18 of 21 sources

Sale Estimate

£693,000

£623k - £762kMedium

Estimate

£693k

Range

£623k – £762k

Rent Estimate (pcm)

£2,650

£2k - £3k

Monthly

£2,650

Yield

3.20%

Verdict

Derived from HomePortfolio scores

13 Lambton House earns an INVESTIGATE rating with HP Score 76/100. Investment score 66/100 reflects moderate fundamentals. Crime intensity is very low. Walkability is limited (49/100). 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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

76/ 100

Strong

Investment Score

66/ 100

Moderate

Crime Score

12/ 100

Low

Walkability

49/ 100

Mixed

Transit & Bike

Transit 19Bike 53

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 5 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 edge-0.6/15
claims [AVM -43.6% (MEDIUM)] → measured edge -0.12pp 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 (MEDIUM confidence) · snapshot 13 Oct 2026
- valuation_snapshotsestimate for 10012308520· as of 13 Oct 2026
Rental economics0/40
gross yield 3.2%; range width penalty ×0.78
- valuation_snapshotsrent estimate 2650/mo (range 2400-2950)· as of 13 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -2,380/mo, -90% 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 5 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 5 Nov 2026
Risk & liquidity12.8/15
349 sales/12mo in area; valuation range width 20%
- 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

£746,000£1,144,000

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£995,000

At the asking price

Monthly rent£2,650/mo

Evidenced range £2,400-£2,950

Interest rate5.4%

Loan to value75%

Cash required: £343,050
Net cash flow: -£1,524/mo
Cash on cash: -5.3%
Score at this price: 12

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.79 - 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_snapshotsestimate for 10012308520Valuation edge · as of 13 Oct 2026
valuation_snapshotsrent estimate 2650/mo (range 2400-2950)Rental economics · as of 13 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 5 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 5 Nov 2026
property_intelligencetransactions_12moRisk & liquidity

Sold comparables in depth

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 2650/mo (range 2400-2950)
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. 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£693,000

Rent Estimate (pcm)£2,650

Gross Yield3.20%

1y Growth+33.9%

3y Growth+0.2%

5y Growth-0.7%

10y Growth+0.3%

Last Sold Price£760,000 (2022-07-07)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0SL4 3TR

Approval Rate

-12mo

Development

low

26/02660/NMA
Non material amendments to planning permission 25/02014/FULL for alterations to the roof pitch of the proposed new small switch room.
Pending
26/02631/FULL
Replacement detached outbuilding ancillary to the main dwelling.
Pending
26/02615/FULL
First floor side extension and alteration to fenestration.
Pending

View Planning Timeline

Ownership

Corporate Ownership59.7%
Overseas OwnershipNo
Lease Term Remaining224 yrs
CovenantsNone
Lease TypeLeasehold
Last Ownership Change2022-07-07
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

6 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£37,653

Population Density4,119 /km²

Owner Occupied71%

Age Distribution

0-15 18%16-64 65%65+ 17%

View Area Profile

Schools Nearby

Clewer Green CofE First School
0.2 mi
Inspected as Clewer Green CofE First School (URN 110022) on 12 Feb 2019
Oakfield First School
0.3 mi
Inspected as Oakfield First School (URN 109897) on 6 Nov 2018
The Lawns Nursery School
0.3 mi
Outstanding
Windsor Girls' School
0.3 mi
Requires improvement

1 of 6 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Lambton House Longbourn
-
£563k
-
Lambton House Longbourn
-
£420k
-
Lambton House Longbourn
-
£760k
-
Lambton House Longbourn
-
£390k
-

Boundary data not available for this property

No registered title polygon, building footprint, or street match for this property yet.

Why: No HMLR INSPIRE / OSM footprint / OS Open USRN match for this UPRN

Source: HM Land Registry INSPIRE / OpenStreetMap / OS Open USRN