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    Flat 4b Portman Mansions Chiltern Street

    FLAT 4B PORTMAN MANSIONS, CHILTERN STREET, LONDON, LONDON, W1U 6NS

    This flat/maisonette leasehold property on Chiltern Street last sold in April 1997 for £155,500. Based on price growth in the W1U district since then, its estimated current value is £1,519,343 — placing it in the 98th percentile nationally and the 37th percentile within W1U. The property covers 132 m² (1,421 sq ft), giving an estimated value of £11,510 per m². The EPC rating is C, with a potential rating of B.

    Type

    Flat/Maisonette

    Tenure

    Leasehold

    Floor Area

    1,421 sq ft

    132 m²

    Last Sale Price

    £995,000

    Aug 2025

    Estimated Valuation

    £1,519,343

    Est. £/sq ft

    £1,069/sq ft

    £11,510/m²

    Property Details

    TypeFlat/Maisonette
    TenureLeasehold
    Built formMid-Terrace
    Construction ageEngland and Wales: 1900-1929
    Habitable rooms4
    Main fuelmains gas (not community)
    EPC currentC
    EPC potentialB
    Floor area1,421 sq ft (132 m²)
    EPC dateJan 2024
    WallsSolid brick, as built, no insulation (assumed)
    HeatingBoiler and radiators, mains gas

    Transaction History

    1 Aug 2025

    £995,000

    28 Jul 2025

    £1,200,000

    14 Apr 1997

    £155,500

    23 Mar 1995

    £99,500

    Key Metrics

    Estimated valuation£1,519,343
    Value per sq ft / m²£1,069/sq ft (£11,510/m²)
    Estimated gross yieldNot available
    Implied monthly rentNot available
    W1U district percentile37th percentile
    National percentile98th percentile

    Other Properties on Chiltern Street

    Flat 5 43aFlat/Maisonette

    £1,175,000

    Mar 2026

    Flat 74 Wendover CourtFlat/Maisonette

    £750,000

    Jan 2026

    Flat 27 Chiltern Place, 66Flat/Maisonette

    £5,750,000

    Jan 2026

    Flat 37 Wendover CourtFlat/Maisonette

    £1,475,000

    Jul 2025

    Flat 11 Wendover CourtFlat/Maisonette

    £1,250,000

    Jun 2025

    Flat 19 43aFlat/Maisonette

    £410,000

    Mar 2025

    Flat 32 Chiltern Place, 66Flat/Maisonette

    £5,380,000

    Sept 2024

    Flat 17 43aFlat/Maisonette

    £825,000

    Sept 2024

    Flat 35 Chiltern Place, 66Flat/Maisonette

    £9,750,000

    Sept 2024

    Flat 5g Portman MansionsFlat/Maisonette

    £3,050,000

    Aug 2024

    Flat 1 63Flat/Maisonette

    £638,000

    Jul 2024

    View full analysis for Chiltern Street →

    District Context — W1U

    W1U covers central London's Mayfair and surrounding areas in Westminster, positioned at the heart of London's West End. It is one of the UK's most prestigious and expensive residential postcodes, characterised by grand period properties, luxury apartments, and strong international appeal.

    Average Property Price - W1U

    £2,271,806

    100

    National percentile

    Average Net Household Income - W1U

    £73,341

    100

    National percentile

    10-Year Annualised Price Growth - W1U

    5.4%

    93

    National percentile

    10-Year Annualised Rent Growth - W1U

    2.8%

    2

    National percentile

    View full analysis for W1U →

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