1Radon: Testing advised
Higher-radon area (3–5% of homes). Radon can affect long-term health.
Ask for existing test results or use a 3-month test kit, about £50.
12 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ
Last sale£610,000Sep 2022 · HM Land Registry
If it moved with Bromley semi-detached prices£622,000Aug 2026 · UK HPI
RadonTesting advised
EnergyEPC CFeb 2022
MapN ↑119 m ↔
Before you offer
1 thing to check
＋ Flood risk very low · Outside coal high-risk 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 Bromley semi-detached prices
£622,000
How does the asking price compare?
This home’s sale history
| Sold | Price | Type | Tenure | Record |
|---|---|---|---|---|
| Sep 2022 | £610,000 | Semi-detached | Freehold | A |
| Jun 2004 | £275,000 | Semi-detached | Freehold | A |
| Aug 1997 | £115,000 | Semi-detached | Freehold | A |
Street sales
Same type and tenure, other homes in the last 36 months: £585,000 · 2 sales
| Address | Sold | Price | Type | Tenure |
|---|---|---|---|---|
| 5 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Jun 2024 | £530,000 | Semi-detached | Freehold |
| 24 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Mar 2024 | £640,000 | Semi-detached | Freehold |
| 12 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Sep 2022 | £610,000 | Semi-detached | Freehold |
| 3 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Oct 2010 | £315,000 | Semi-detached | Freehold |
| 24 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Mar 2009 | £310,000 | Semi-detached | Freehold |
| 5 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Nov 2007 | £330,000 | Semi-detached | Freehold |
| 1 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Aug 2007 | £338,000 | Semi-detached | Freehold |
| 7 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Jul 2004 | £294,995 | Semi-detached | Freehold |
Show all 12
| Address | Sold | Price | Type | Tenure |
|---|---|---|---|---|
| 12 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Jun 2004 | £275,000 | Semi-detached | Freehold |
| 24 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Jul 2003 | £285,000 | Semi-detached | Freehold |
| 12 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Aug 1997 | £115,000 | Semi-detached | Freehold |
| 7 Koonowla Close, Biggin Hill, Westerham, TN16 3BJ | Jun 1997 | £22,000 | Semi-detached | Freehold |
The land
Radon: Testing advised
Higher-radon area (3–5% of homes). Radon can affect long-term health.
Ask for existing test results or use a 3-month test kit, about £50.
＋ Flood risk very low · Outside coal high-risk 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
- 135 m²
- Potential EPC band
- B
- Age band
- England and Wales: 1950-1966
- Walls (certificate wording)
- Cavity wall, filled cavity
- 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: 68.6%
Schools nearby
- Biggin Hill Primary SchoolPrimary · 566 m · School remains Good
- Oaklands Primary AcademyPrimary · 713 m · Requires improvement
- Charles Darwin SchoolSecondary · 829 m · Good
- Cudham Church of England Primary SchoolPrimary · 1471 m · Good
Area context
Deprivation decile (1 is most deprived within its nation): 9 · England 2025
Recorded police incidents: 88
TN16 3BJ →Before you offer
Viewing checklist
Saved privately on this device
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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?
- Radon: Ask for existing test results or use a 3-month test kit, about £50.
Ask the conveyancer
Which title, drainage and local searches are needed for this address?
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