Flat 31, Adastra House, 403 Nether Street, London, N3 1QG

UPRN:10093993142Flat/Maisonette2 bedsBuilt -

LeaseholdCouncil Tax: Band DEPC: B (83)

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

Flat 31, Adastra House, 403 Nether Street, London, N3 1QG

HP Score

/ 100

Mixed

Verdict

today

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

Evidence

19 of 21 sources

Sale Estimate

£485,000

£461k - £509kHigh

Estimate

£485k

Range

£461k – £509k

Rent Estimate (pcm)

£1,900

£2k - £2k

Monthly

£1,900

Yield

4.80%

Verdict

Derived from HomePortfolio scores

Flat 31 earns an INVESTIGATE rating with HP Score 74/100. Investment score 80/100 reflects strong fundamentals. Crime intensity is moderate. Walkability is good (82/100). 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 leasesHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

74/ 100

Mixed

Investment Score

80/ 100

High

Crime Score

59/ 100

Elevated

Walkability

82/ 100

High

Transit & Bike

Transit 74Bike 65

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesLead to verifyListing checked 30 Oct 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 +2.1% (HIGH)] → 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 (HIGH confidence) · snapshot 9 Oct 2026
- valuation_snapshotsestimate for 10093993142· as of 9 Oct 2026
Rental economics0/40
gross yield 4.8%; range width penalty ×0.83
- valuation_snapshotsrent estimate 1900/mo (range 1750-2100)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -737/mo, -39% 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 30 Oct 2026· verify before relying on this
Seller motivationNot scored
no listing-history inputs (first published date, price changes)
Risk & liquidity14.7/15
188 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

£356,000£546,000

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£475,000

At the asking price

Monthly rent£1,900/mo

Evidenced range £1,750-£2,100

Interest rate5.4%

Loan to value75%

Cash required: £157,550
Net cash flow: -£288/mo
Cash on cash: -2.2%
Score at this price: 15

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.19 - 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 10093993142Valuation edge · as of 9 Oct 2026
valuation_snapshotsrent estimate 1900/mo (range 1750-2100)Rental economics · as of 9 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 30 Oct 2026 · verify before relying on this
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 1900/mo (range 1750-2100)
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£485,000

Rent Estimate (pcm)£1,900

Gross Yield4.80%

1y Growth-31.7%

3y Growth-1.9%

5y Growth-0.5%

10y Growth+0.6%

Last Sold Price£535,000 (2019-08-14)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0N3 1QG

Approval Rate

-12mo

Development

low

26/3959/192
Single storey rear extension with 2no. rooflights following the demolition of existing conservatory
Pending
26/3931/FUL
Conversion of the existing dwelling into 3no. self-contained flats including single storey side and rear extensions, first floor side extension following demolition of existing side extension. Replacement of the existing rear dormer window to the rear main roof and additional roof addition to the outrigger and 1no. rooflight to the front and 1no. rooflight to rear main roof. Associated refuse/recycling to front and cycle storage to rear
Pending
TPP/0670/26
1 x Evergreen Oak (applicants ref. T639) - Lift crown to 3m above ground level and 2m above adjacent wall. Reduce spread on building side to give 1m clearance. Standing in Area A1 of Tree Preservation Order.
Pending

View Planning Timeline

Ownership

Corporate Ownership48.3%
Overseas OwnershipNo
Lease Term Remaining241 yrs
CovenantsNone
Lease TypeLeasehold
Last Ownership Change2019-08-14
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

17 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£39,239

Population Density7,979 /km²

Owner Occupied38%

Age Distribution

0-15 18%16-64 71%65+ 11%

View Area Profile

Schools Nearby

St Mary's CofE Primary School
0.2 mi
Report card2026
Ofsted no longer awards a single overall grade.
Pardes House Grammar School
0.3 mi
Report card2026
Ofsted no longer awards a single overall grade.
Pardes House Primary School
0.3 mi
Report card2025
Ofsted no longer awards a single overall grade.
Finchley and Acton Yochien School
0.3 mi
Good

3 of 11 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

Adastra House, 403 Nether Street
-
£378k
-
Adastra House, 403 Nether Street
-
£665k
-
Adastra House, 403 Nether Street
-
£358k
-
Adastra House, 403 Nether Street
-
£635k
-

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