Flat 25, Tamar House, 12 Tavistock Place, London, WC1H 9RD

UPRN:5047129Purpose Built Flat2 bedsBuilt 1967-1975

LeaseholdCouncil Tax: Band FEPC: E (54)

Data freshness:Listing· freshPrice Paid· freshEPC· 1mo agoRisk· 5mo agoConnectivity· 1mo agoSchools· 3mo agoAmenities· 1mo agoArea· Census 2021Council Tax· 6mo ago

Flat 25, Tamar House, 12 Tavistock Place, London, WC1H 9RD

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

£686,000

£549k - £823kLow

Estimate

£686k

Range

£549k – £823k

Rent Estimate (pcm)

£3,400

£3k - £4k

Monthly

£3,400

Yield

4.80%

Verdict

Derived from HomePortfolio scores

Flat 25 earns an INVESTIGATE rating with HP Score 64/100. Investment score 65/100 reflects moderate fundamentals. Crime intensity is moderate. Walkability is limited (66/100). 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

64/ 100

Mixed

Investment Score

65/ 100

Moderate

Crime Score

55/ 100

Elevated

Walkability

66/ 100

Moderate

Transit & Bike

Transit 100Bike 69

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 4.8%; range width penalty ×0.88
- valuation_snapshotsrent estimate 3400/mo (range 3100-3650)· as of 9 Oct 2026· verify before relying on this
Stress margin0/30
stressed cash flow -1,664/mo, -49% of rent (6.75% on a 75% loan; disclosed service charge and ground rent); fails the stress - earns nothing
- listing_factsservice charge / ground rent from the advert· as of 5 Nov 2026
Risk & liquidity9.3/15
43 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£850,000

At the asking price

Monthly rent£3,400/mo

Evidenced range £3,100-£3,650

Interest rate5.4%

Loan to value75%

Cash required: £288,800
Net cash flow: -£515/mo
Cash on cash: -2.1%
Score at this price: -

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_snapshotsrent estimate 3400/mo (range 3100-3650)Rental economics · as of 9 Oct 2026 · verify before relying on this
listing_factsservice charge / ground rent from the advertStress margin · as of 5 Nov 2026
portal_listingsprice_changes + first_published_dateSeller motivation · as of 5 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 3400/mo (range 3100-3650)

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£686,000

Rent Estimate (pcm)£3,400

Gross Yield4.80%

1y Growth+81.8%

3y Growth-8.9%

5y Growth-2.8%

10y Growth+0.1%

Last Sold Price£600,000 (2010-08-24)

View Market Details

Risk Overview

Flood RiskUnknown
SubsidenceSignificant
RadonLow
MiningUnknown
LandslideLow
Air QualityLow
NoiseModerate

View Full Risk Report

Planning Activity

Recent Apps

-WC1H 9RD

Approval Rate

-12mo

Development

2026/4584/L
Internal alterations and refurbishments, including reconfigured bathrooms, alterations to partitions and doors, and reinstatement of traditional cornices and joinery.
Pending
2026/4810/P
Details pursuant to Condition 7(b) (Brickwork) of planning permission ref. 2023/5470/P (dated 12/03/2025) for: Deep refurbishment of existing building including new facades; erection of replacement roof extension with terrace to rear; reopening of lightwell to front and reconfiguration of entrance area; demolition of two storey outrigger and replacement with three storeys plus plant enclosure; single storey rear infill extension to existing car park with terrace above; erection of full height stair rear core extension.
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

View Planning Timeline