How much is Harrowby Street, Marylebone?

4 bed flat for sale in Marylebone – £625,000

About

The property

Combining bright, well proportioned interiors with stunning west-facing views, this fantastic 4 bedroom flat is located on the 10th floor of a Portered building just north of Oxford Street and Marble Arch.

Harrowby Street is a residential street close to the shops, cafés and restaurants of Edgware Road and just moments from the extensive attractions of the West End.

Please use the reference CHPK0300745 when contacting Foxtons.

Key information

Price per Square Foot

£691/sq ft

Based on 904 sq ft (84 sq m)

Floor Area

904 sq ft (84 sq m)

Reception Rooms

1

Council Tax Band

Band F

Estimated ~£2600/year

Tenure

Leasehold (82 years)

Local Authority

City of Westminster London Boro

London Borough

County

Greater London Authority

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Value & comps

What is it worth?

No previous sales on record.

Comparable salesNo comps yet

No comparable sales matched this property yet.

Returns

What does it return?

Set an offer; the calculator follows it.

Rent evidence

Rental benchmark

Nearby rental comparables

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Local SA Market

We're still gathering serviced-accommodation data for this area.

Archie refurb estimate: a Pro feature

Model an offerFeeds your report · not a commitment

0.0% below asking

Model

Run the numbers.

BTL · HMO · BRRR · SA · Flip — editable, saved scenarios

Investment calculatorBTL · BRRR · HMO · Flip · SA · R2R — editable inputs, saved scenarios

Investment Disclaimer

This is not financial or investment advice. Prop AI Deals is not authorised by the Financial Conduct Authority (FCA) to provide investment advice.

All investment calculators, property analyses, and AI-generated insights are for informational purposes only. Property investment carries risk and may result in financial loss. All calculations should be independently verified and you should consult with FCA-authorised financial advisors before making any investment decisions.

Past performance does not guarantee future results. Tax implications vary by individual circumstances.

Mortgage

Deal

Is it a deal?

Archie’s verdict

Archie has scored this property.

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Deal score · weighted

Weak signals — move on

Factor breakdown

BMV discountNot calculated, and not zero — there is no value estimate for this property to discount against.

0/25

Yield potential—

0/25

Motivation signalsNot enough data

0/25

Days on market1 days

4/25

—

Seller motivation

Not scored yet

Days on market1

Price reduction—

STC fall-through—

Back to market—

Agency change—

EPC rating—

Listing timeline

First listedListed at £625,00020-10-2026

Still activeDay 1 on marketToday

Strategy fit

No strategy scores available yet.

Article 4No HMO Article 4 held

HMO Conversion Potential

Properties like this can earn 2–3x BTL yields when converted to HMO, with retrofit costs around £10k/room. Sign in to see the full tier, yield projection, and cost breakdown.

Tier, yield projection, and cost stack — Pro tier only.

PD Conversion Potential

Commercial properties like this can earn 30-50% higher yields when converted to residential under Class MA / Q / P / PA, with prior approval costing ~GBP 96/unit. Sign in to see the recommended route, yield uplift, and cost breakdown.

Tier, route, yield projection, and cost stack - Pro tier only.

BRRR Candidate

BRRR-suited properties can recycle 80-100% of investor capital on refi, leaving a high-yielding rental with most of the money out. Sign in to see the refurb cost stack, ARV projection, and refinance maths.

Tier, refurb cost, ARV, and refi maths - Pro tier only.

Plot subdivision potential

Detached + large garden = sub-division play. Pro tier unlocks the tier badge, plot size, uplift estimate, and regional land benchmark.

Lease extension arbitrage

Short-lease flats trade at deep discount, but extending under the 1993 Act often costs far less than the discount. Pro tier unlocks the tier badge, premium breakdown, long-lease ARV and arbitrage maths.