18 Maze Avenue, Costessey, Norwich, NR8 5GD

UPRN:2630173641Detached House4 bedsBuilt 2007-2011

FreeholdCouncil Tax: Band CEPC: C (77)

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

18 Maze Avenue, Costessey, Norwich, NR8 5GD

HP Score

/ 100

Mixed

Verdict

4 days ago

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

Evidence

17 of 21 sources

Sale Estimate

£359,000

£341k - £377kHigh

Estimate

£359k

Range

£341k – £377k

Rent Estimate (pcm)

£1,500

£1k - £2k

Monthly

£1,500

Yield

5.29%

Verdict

Derived from HomePortfolio scores

18 Maze Avenue earns an INVESTIGATE rating with HP Score 66/100. Investment score 58/100 reflects moderate fundamentals. Crime intensity is very low. Walkability is limited (13/100). Flood risk is not assessed: check the Environment Agency long-term flood map before offering. Tenure is freehold. 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 covenantsHM Land Registry Price PaidPlanIt / council planning portalsOverture Maps PlacesOfsted / DfE GIAS

HP Score

66/ 100

Mixed

Investment Score

58/ 100

Moderate

Crime Score

14/ 100

Low

Walkability

13/ 100

Low

Transit & Bike

Transit 32Bike 32

Walk Score, out of 100

Opportunity

Why this could be an opportunity

Low confidence0 independent sourcesListing checked 30 Oct 2026

This rests largely on a single source. Treat the score as a prompt to investigate, not a conclusion.

Valuation edge0/15
claims [AVM +5.3% (HIGH), sold-comps -5.3%, £/sqft -5.2%] → 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 2630173641· as of 9 Oct 2026
- property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 10.2%· as of 20 Oct 2026
Rental economics2/40
gross yield 5.3%; range width penalty ×0.87
- valuation_snapshotsrent estimate 1500/mo (range 1350-1600)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -462/mo, -31% 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 30 Oct 2026
Seller motivationNot scored
context, not scored: 0 price cut(s), 92 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 30 Oct 2026
Risk & liquidity14.6/15
277 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

£255,000£391,000

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£340,000

At the asking price

Monthly rent£1,500/mo

Evidenced range £1,350-£1,600

Interest rate5.4%

Loan to value75%

Cash required: £110,300
Net cash flow: -£109/mo
Cash on cash: -1.2%
Score at this price: 17

After a 8% void allowance, 15% management and 10% maintenance. Lender coverage (rent ÷ interest): 1.31 - 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 2630173641Valuation edge · as of 9 Oct 2026
property_comparablessold-evidence family (implied value + £/sqft): 12 comps, dispersion 10.2%Valuation edge · as of 20 Oct 2026
valuation_snapshotsrent estimate 1500/mo (range 1350-1600)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
portal_listingsprice_changes + first_published_dateSeller motivation · as of 30 Oct 2026

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 1500/mo (range 1350-1600)
Seller motivation could not be scored
context, not scored: 0 price cut(s), 92 days on market; homes with a cut sold 0.2-0.3pp further below the cut ask, which is not an edge

Property risk deep-dive →

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£359,000

Rent Estimate (pcm)£1,500

Gross Yield5.29%

1y Growth+3.8%

3y Growth+0.1%

5y Growth+1.7%

10y Growth+3.4%

Last Sold Price£185,000 (2014-11-07)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceModerate
RadonLow
MiningLow
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

0NR8 5GD

Approval Rate

-12mo

Development

low

2025/3295
Erection of a glasshouse to serve existing garden centre and nursery business
Conditions
2025/3168
Certificate of lawfulness for proposed 4m single storey extension
Decided
2024/2298
Conversion of existing garage into an annexe
Decided

View Planning Timeline