1Leasehold: Lease documents needed
The lease term and charges affect future costs and mortgage options.
Ask the agent for the lease, remaining term, charges and planned works.
Flat 4, 21 Siddons Lane, London, NW1 5NF
Last sale£820,000Mar 2026 · HM Land Registry
If it moved with City Of Westminster flat prices£825,000Aug 2026 · UK HPI
Surface water floodingVery low
EnergyEPC CSep 2025
MapN ↑119 m ↔
Before you offer
1 thing to check
＋ Flood risk very low · Outside coal high-risk area · Not in a higher-radon area · EPC C
Not covered here yet: conservation area, listed buildings nearby, article 4 direction, tree protection, road noise, rail noise, airport noise. Your conveyancer’s local search covers the planning checks.
Prepare for a viewing ↓Saved privately on this devicePrice
If it moved with City Of Westminster flat prices
£825,000
How does the asking price compare?
This home’s sale history
| Sold | Price | Type | Tenure | Record |
|---|---|---|---|---|
| Mar 2026 | £820,000 | Flat / maisonette | Leasehold | A |
| Sep 1998 | £210,000 | Flat / maisonette | Leasehold | A |
| Feb 1995 | £145,500 | Flat / maisonette | Leasehold | A |
Street sales
| Address | Sold | Price | Type | Tenure |
|---|---|---|---|---|
| Flat 4, 21 Siddons Lane, London, NW1 5NF | Mar 2026 | £820,000 | Flat / maisonette | Leasehold |
| Flat 35, 5 Siddons Lane, London, NW1 6EH | Nov 2019 | £175,000 | Flat / maisonette | Leasehold |
| Flat 31, 5 Siddons Lane, London, NW1 6EH | Oct 2019 | £461,000 | Other property | Leasehold |
| Flat 4, 21 Siddons Lane, London, NW1 5NF | Sep 1998 | £210,000 | Flat / maisonette | Leasehold |
| Flat 4, 21 Siddons Lane, London, NW1 5NF | Feb 1995 | £145,500 | Flat / maisonette | Leasehold |
The land
＋ Flood risk very low · Outside coal high-risk area · Not in a higher-radon area
Not covered here yet: conservation area, listed buildings nearby, article 4 direction, tree protection. Your conveyancer’s local search covers the planning checks.
View building and land map ↑The building
EPC C
Poor insulation or an EPC E–G rating can mean higher heating bills.
Read the full certificate and ask about insulation and heating costs.
- Floor area
- 78 m²
- Potential EPC band
- C
- Age band
- England and Wales: 1976-1982
- Walls (certificate wording)
- Cavity wall, as built, partial insulation (assumed)
- Roof (certificate wording)
- Pitched, 200 mm loft insulation
- Windows (certificate wording)
- Fully double glazed
- Heating (certificate wording)
- Boiler and radiators, mains gas
- Building height
- Unavailable
Living
Broadband in the area
Postcode residential gigabit coverage: 100%
Full fibre in the local authority: 87.3%
Schools nearby
- Francis Holland School109 m
- London Business School322 m
- St Edward's Catholic Primary SchoolPrimary · 468 m · Good
- St Mary's Bryanston Square CofE SchoolPrimary · 491 m · Good
- Royal Academy of Music510 m
- ICS London516 m
- The St Marylebone CofE SchoolSecondary · 522 m · Not judged
- Abingdon House School530 m
- Christ Church Bentinck CofE Primary SchoolPrimary · 585 m · School remains Outstanding
- Portman Early Childhood CentreNursery · 593 m · Outstanding
- St Vincent's Catholic Primary SchoolPrimary · 751 m · Outstanding
- Ark King Solomon AcademyAll-through · 773 m · Outstanding
- Sylvia Young Theatre School809 m
- Wetherby Preparatory School840 m
- Gateway AcademyPrimary · 877 m · Good
- Hampden Gurney CofE Primary SchoolPrimary · 890 m · Good
- Wetherby Senior School939 m
- Southbank International School Westminster944 m
- Halcyon London International School964 m
- Woodside School983 m
- Queen's College, London1045 m
- Eifa International School1105 m
- United Colleges Group16 plus · 1151 m
- Connaught House School1168 m
- St John's Wood Primary SchoolPrimary · 1194 m · Standards maintained
- L'Ecole Bilingue Elementaire1265 m
- Christ Church SchoolPrimary · 1295 m · School remains Good
- Hospital Home and Education Units co St Mary's Hospitial Tuition Unit1304 m
- Camden Primary Pupil Referral Unit1343 m · School remains Good
- Netley Primary SchoolPrimary · 1350 m · Good
- Saint Christina's School1357 m
- University of Westminster1358 m
- Marylebone AcademySecondary · 1364 m · School remains Good
- All Souls CofE Primary SchoolPrimary · 1494 m · Not judged
Area context
Deprivation decile (1 is most deprived within its nation): 8 · England 2025
Recorded police incidents: 318
NW1 5NF →Before you offer
Viewing checklist
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Lease documents
Needs document · Saved privately on this device
Next steps
Ask a surveyor to confirm Level 2 or Level 3 after reviewing the age, condition and alterations.
Ask the conveyancer about local authority, drainage, environmental, flood and mining searches appropriate to this address.
Compare survey levels →Questions for the agent
Questions for your surveyor and conveyancer
Ask the surveyor
Which survey level covers this home’s condition, damp, cracks and any alterations?
Ask the conveyancer
Which title, drainage and local searches are needed for this address?
- Leasehold: Ask the agent for the lease, remaining term, charges and planned works.
Sources and licences
Contains British Geological Survey materials © UKRI 2026
Radon Potential classification UK Health Security Agency © Crown copyright 2022
© Environment Agency copyright and/or database right 2026. All rights reserved.
INSPIRE conditions · Sources and licences