Apartment 3, Tewin Water House, Welwyn, AL6 0AA

UPRN:10034515200Detached House4 bedsBuilt before 1900

LeaseholdCouncil Tax: -EPC: E (54)

Data freshness:Listing· freshPlanning· 6mo agoOwnership· 1mo agoEPC· 6mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 1mo agoAmenities· 2mo agoArea· Census 2021

Apartment 3, Tewin Water House, Welwyn, AL6 0AA

HP Score

/ 100

Mixed

Verdict

4 days ago

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

Evidence

19 of 21 sources

Sale Estimate

£1,450,000

£1.38M - £1.52MHigh

Estimate

£1.45M

Range

£1.38M – £1.52M

Rent Estimate (pcm)

£4,600

£4k - £5k

Monthly

£4,600

Yield

4.01%

Verdict

Derived from HomePortfolio scores

Apartment 3 earns an INVESTIGATE rating with HP Score 59/100. Investment score 51/100 reflects moderate fundamentals. Crime intensity is low. Walkability is limited (5/100). 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 Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

59/ 100

Mixed

Investment Score

51/ 100

Moderate

Crime Score

26/ 100

Moderate

Walkability

5/ 100

Low

Transit & Bike

Transit 2Bike 18

Walk Score, out of 100

Opportunity

Not scored as an opportunity

We will not put a number on this one.

listing is a flat but the valuation basis is the whole house at this UPRN - value evidence is not comparable

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£1,375,000

At the asking price

Monthly rent£4,600/mo

Evidenced range £4,050-£5,200

Interest rate5.4%

Loan to value75%

Cash required: £495,050
Net cash flow: -£1,456/mo
Cash on cash: -3.5%
Score at this price: -

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 0.99 - below the usual 1.25 test. These are your assumptions, not evidence: only the pre-filled rent and price come from the record.

Risks

What could kill this deal

Score confidence is low
largely a single source - treat the number as a prompt, not a conclusion

Property risk deep-dive →flood, subsidence, crime, environment - the full domain

Plan

Before you offer

1. 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£1,450,000

Rent Estimate (pcm)£4,600

Gross Yield4.01%

1y Growth-4.0%

3y Growth-1.8%

5y Growth+0.4%

10y Growth+1.4%

Last Sold Price£895,000 (2006-11-07)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningModerate
LandslideLow
Air QualityLow
NoiseLow

View Full Risk Report

Planning Activity

Recent Apps

0AL6 0AA

Approval Rate

-12mo

Development

low

6/2026/1905/EMT
Remove 1 x WIllow
Pending
6/2026/1835/EMT
Fell 1 x very large Conifer tree to front of property due to root damage to footpath and concerns over potential storm damage to neighbouring properties
Pending
6/2026/1726/PN8
Prior approval for a rear extension measuring 6m in depth, 2.5m to the eaves and the maximum height of 3m
Pending

View Planning Timeline

Ownership

Corporate Ownership71.3%
Overseas OwnershipNo
Lease Term Remaining999+ yrs
CovenantsRestrictive
Lease TypeLeasehold
Last Ownership Change2006-11-07
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 Density88 /km²

Owner Occupied76%

Age Distribution

0-15 17%16-64 60%65+ 23%

View Area Profile

Schools Nearby

Waterside Academy
0.3 mi
Report card2026
Ofsted no longer awards a single overall grade.
The Holy Family Catholic Primary School
0.3 mi
Inspected as The Holy Family Catholic Primary School (URN 117481) on 15 Oct 2024
St John's CofE Primary School
0.4 mi
Good
Harwood Hill Junior Mixed Infant and Nursery School
0.8 mi
Good

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

View All Schools

Comparables

View All

Tewin Water House Tewin Water
-
£835k
-
Tewin Water House Tewin Water
-
£870k
-
Tewin Water House Tewin Water
-
£1.23M
-
Tewin Water House Tewin Water
-
£758k
-

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