Flat 1, Trematon Building, 1 Trematon Walk, London, N1 9FN

UPRN:10090549167Flat/Maisonette2 bedsBuilt 2007-2011

Tenure: -Council Tax: Band EEPC: C (79)

Data freshness:Planning· 4mo agoOwnership· freshEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021Council Tax· 6mo ago

Flat 1, Trematon Building, 1 Trematon Walk, London, N1 9FN

HP Score

/ 100

Mixed

Verdict

2 days ago

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

Evidence

17 of 21 sources

Sale Estimate

£840,000

£756k - £924kMedium

Estimate

£840k

Range

£756k – £924k

Rent Estimate (pcm)

£4,200

£4k - £5k

Monthly

£4,200

Yield

7.05%

Verdict

Derived from HomePortfolio scores

Flat 1 earns an INVESTIGATE rating with HP Score 62/100. Investment score 67/100 reflects moderate fundamentals. Crime intensity is elevated. Walkability is excellent (99/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Every figure here comes from the live HomePortfolio API; anything it does not publish is left out.

Key SourcesEPC RegisterPortal listingsOfcom Connected NationsMarket estimates (third-party AVM)Defra 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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

62/ 100

Mixed

Investment Score

67/ 100

Moderate

100

Crime Score

100/ 100

Elevated

Walkability

99/ 100

Excellent

Transit & Bike

Transit 100Bike 76

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence1 independent sourceLead to verifyListing checked 2 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 edge0/15
claims [AVM +14.9% (MEDIUM)] → measured edge +0.00pp 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 (MEDIUM confidence) · snapshot 9 Nov 2026
- valuation_snapshotsestimate for 10090549167· as of 9 Nov 2026
Rental economics14.2/40
gross yield 7.0%; range width penalty ×0.87
- valuation_snapshotsrent estimate 4200/mo (range 3850-4550)· as of 9 Nov 2026· verify before relying on this
Stress margin0/30
stressed cash flow -59/mo, -1% 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 2 Nov 2026· verify before relying on this
Seller motivationNot scored
context, not scored: 0 price cut(s), 41 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 2 Nov 2026
Risk & liquidity12.8/15
633 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

£536,000£822,000

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£715,000

At the asking price

Monthly rent£4,200/mo

Evidenced range £3,850-£4,550

Interest rate5.4%

Loan to value75%

Cash required: £241,550
Net cash flow: £495/mo
Cash on cash: 2.5%
Score at this price: 27

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.74 - 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 10090549167Valuation edge · as of 9 Nov 2026
valuation_snapshotsrent estimate 4200/mo (range 3850-4550)Rental economics · as of 9 Nov 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 2 Nov 2026 · verify before relying on this
portal_listingsprice_changes + first_published_dateSeller motivation · as of 2 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 4200/mo (range 3850-4550)
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£840,000

Rent Estimate (pcm)£4,200

Gross Yield7.05%

1y Growth-

3y Growth-1.3%

5y Growth-0.6%

10y Growth+0.5%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0N1 9FN

Approval Rate

-12mo

Development

low

2026/4841/P
Non-material amendment to planning permission ref. 2025/1684/P (granted as a variation of conditions 2 (approved drawings) and 20 (fire statement) of planning permission ref. 2022/1817/P dated 10/05/2023 for the erection of roof extensions at third, fourth and fifth floor level with rooftop plant in connection with the continued commercial use of the building (Class E) with associated external alterations to all elevations, public realm improvements; roof terraces at levels three, four and five, provision of cycle parking, waste/recycling storage and other services), namely to: amend the location of the affordable workspace from the first floor to the ground floor.
Pending
2026/4793/P
Details pursuant to condition 3 (Crossrail 2 Infrastructure), Part 4 (Substructure elements associated with TfL areas) of planning permission 2022/1041/P dated 17/07/2024 (for Demolition of the British Library Centre for Conservation, alterations to the British Library and erection of a new building)
Pending
2026/4778/L
Internal refurbishment and fit-out works to the existing restaurant unit, including associated alterations to internal fixtures, fittings, finishes, lighting, joinery and servicing.
Pending

View Planning Timeline

Ownership

Corporate Ownership43.2%
Overseas OwnershipNo
Lease Term Remaining999+ yrs
CovenantsNone
Lease Type-
Last Ownership Change-
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

17 Mbps

Mobile 4G/5G Coverage

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£47,411

Population Density13,401 /km²

Owner Occupied21%

Age Distribution

0-15 11%16-64 80%65+ 9%

View Area Profile

Schools Nearby

Kate Greenaway Nursery School and Children's Centre
0.2 mi
-
New River College Medical
0.2 mi
Report card2026
Ofsted no longer awards a single overall grade.
Winton Primary School
0.2 mi
OutstandingImproving
Kings Cross Academy
0.3 mi
Good

1 of 10 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Trematon Building, 1 Trematon Walk
-
£485k
-
Trematon Building, 1 Trematon Walk
-
£625k
-
Trematon Building, 1 Trematon Walk
-
£215k
-
Trematon Building, 1 Trematon Walk
-
£555k
-

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