1, APARTMENT 4, WILLIAM STREET

SW1X 9HL · Knightsbridge & Belgravia

Last Sold Price

£2,550,000

2025-09-30 · Flat · Leasehold

↓ 83%

since first sale

📋 Sale History (3)

2025-09-30

Flat Leasehold

£2,550,000

2024-03-12

Flat Leasehold

£2,650,000

2023-09-29

Flat Leasehold

£15,200,000

⚡ EPC Energy Rating

8, 1 William Street

Score: 71/100 · Certified: 2022-04-27

▶ C

Floor Area

90.0 m²

Property Type

Flat

Build Period

2021

Walls

Average thermal transmittance 0.29 W/m-¦K

Roof

(other premises above)

Heating

Community scheme

Price / m²

£28,333

Price / ft²

£2,632

🏛️ Stamp Duty Estimate

Based on last sold price of £2,550,000 (2025/26 rates)

Standard

£217,250

8.5% eff.

First-Time

£217,250

8.5% eff.

Additional

£344,750

13.5% eff.

Full calculator →

🎓 Nearest Schools (5)

More House School

Not applicable 1890ft

Not rated

Hill House School

Not applicable 1921ft

Not rated

Knightsbridge School

Not applicable 2313ft

Not rated

Sussex House School

Not applicable 2926ft

Not rated

Holy Trinity CofE Primary School

Primary 3372ft

Not rated

🔒 Crime in Area

1767 incidents last month (within ~1 mile)

Theft From The Person397 (22%)

Shoplifting283 (16%)

Other Theft278 (16%)

Violent Crime228 (13%)

Anti Social Behaviour217 (12%)

Vehicle Crime101 (6%)

Public Order82 (5%)

Drugs66 (4%)

Robbery63 (4%)

Criminal Damage Arson52 (3%)

🏘️ Nearby Sales in SW1X 9HL

1, APARTMENT 9, WILLIAM STREET

2025-09-30 · Flat

£2,550,000

1, APARTMENT 7, WILLIAM STREET

2024-03-12 · Flat

£2,650,000

📍 Explore SW1X

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Source: HM Land Registry, EPC Register, Ofsted, data.police.uk · Crown copyright · OGL v3.0