18 Firs Walk, Tewin, Welwyn, AL6 0NZ

UPRN:100080757902-Beds -Built 1930-1949

Tenure: -Council Tax: Band GEPC: E (52)

Data freshness:Ownership· freshEPC· 3mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

HP Score

/ 100

Mixed

Verdict

yesterday

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

Evidence

17 of 21 sources

Sale Estimate

£1,593,000

£1.27M - £1.91MLow

Estimate

£1.59M

Range

£1.27M – £1.91M

Rent Estimate (pcm)

£5,050

£4k - £6k

Monthly

£5,050

Yield

3.58%

Verdict

Derived from HomePortfolio scores

18 Firs Walk earns an INVESTIGATE rating with HP Score 60/100. Investment score 56/100 reflects moderate fundamentals. Crime intensity is low. Walkability is limited (10/100). 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 NationsOfcom mobile coverageMarket 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 covenantsHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

60/ 100

Mixed

Investment Score

56/ 100

Moderate

Crime Score

22/ 100

Moderate

Walkability

10/ 100

Low

Transit & Bike

Transit 37Bike 14

Walk Score, out of 100

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 3.6%; range width penalty ×0.70
- valuation_snapshotsrent estimate 5050/mo (range 4450-5700)· as of 12 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -3,569/mo, -71% 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 3 Nov 2026
Risk & liquidity9.2/15
98 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£1,695,000

At the asking price

Monthly rent£5,050/mo

Evidenced range £4,450-£5,700

Interest rate5.4%

Loan to value75%

Cash required: £626,950
Net cash flow: -£2,224/mo
Cash on cash: -4.3%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.88 - 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 5050/mo (range 4450-5700)Rental economics · as of 12 Oct 2026 · verify before relying on this
underwriting_assumptionscosts not disclosed by the advertStress margin · as of 3 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 3 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 5050/mo (range 4450-5700)

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. Fill the valuation edge gap before relying on the score.
estimate confidence LOW below scoring floor
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£1,593,000

Rent Estimate (pcm)£5,050

Gross Yield3.58%

1y Growth-

3y Growth-1.8%

5y Growth+0.4%

10y Growth+1.4%

Last Sold Price-

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningLow
LandslideLow
Air QualityLow
NoiseBelow 40 dB

View Full Risk Report

Planning Activity

Recent Apps

0AL6 0NZ

Approval Rate

-12mo

Development

low

X/26/0472/CND
Discharge of Conditions 3 (Construction Environmental Management Plan (CEMP)), 4 (Roof Stripping), 5 (Materials), 6 (Landscape Design Proposals), 7 (Species Enhancement Plan), 9 (Air source heat pump details), 14 (Water Use) attached to 3/26/0976/VAR
Pending
3/26/1315/NMA
Non-material amendment to 3/26/0321/HH, removal of roof parapets
Approved
3/26/1307/HH
Demolition of existing garage, removal of the chimney, construction of two storey side and rear extension with Juliette balcony at the rear, front porch, car port, render finish to existing dwelling and alterations to fenestration
Pending

View Planning Timeline

Ownership

Corporate Ownership71.1%
Overseas OwnershipNo
Lease Term Remaining-
CovenantsRestrictive
Lease Type-
Last Ownership Change-
SourceLand Registry

View Ownership Details

Connectivity

Broadband (Standard)

18 Mbps

Mobile 4G/5G Coverage

EEThreeO2Vodafone

EV Charger

PTAL Rating

View Connectivity Map

Area Profile

Median EarningsLocal authority£44,154

Population Density-

Owner Occupied73%

Age Distribution

0-15 16%16-64 59%65+ 25%

View Area Profile

Schools Nearby

Tewin Cowper Church of England Voluntary Aided Primary School
1.1 mi
Area grades2024
Inspected after Ofsted withdrew the single overall grade.
St John's CofE Primary School
1.6 mi
Good
St Michael's Woolmer Green CofE VA Primary School
1.7 mi
Good
Waterside Academy
1.7 mi
Report card2026
Ofsted no longer awards a single overall grade.

2 of 13 nearby schools with published figures were oversubscribed in 2026 - demand, not a catchment.

View All Schools

Comparables

View All

6 Firs Walk
-
£1.30M
-
2 Firs Walk
-
£2.11M
-
26 Firs Walk
-
£1.00M
-
22 Firs Walk
-
£1.60M
-

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