Kelvin, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
About Kelvin
Kelvin is a semi-detached house in Platt, Sevenoaks, Sevenoaks (TN15 8LZ). It has a recorded floor area of 70 m² (around 752 sq ft), construction records dating it to before 1900 and council tax band D. The latest certificate (April 2010) shows a G (score 20), near the bottom of the EPC scale. Main heating runs on lpg. The latest certificate is from April 2010, so improvements made since then won't be reflected.
At 70 m² it sits well below the postcode median (149 m² across 9 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2006–2024, sale prices on this property compounded at 4.1% per year. On a £-per-square-foot basis, the last sale (£572/sq ft) was about 108.6% above the typical sold price in the postcode. Most recent transfer: September 2024 at £430,000. One historical planning record sits against the property in 2016.
Know exactly what you're buying at Kelvin
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
Kelvin sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 07 Apr 2020
EPC Rating
Planning history
- May 2016Tree WorksTreesIn report
Fell 4 x Leylandii conifers at end of garden
- Documents
- 8 docs on file
- Reference
- 16/01168/TNCA
What's in Kelvin, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ's planning history?
Refusals, disputes and full decisions on this property and nearby, in the report.
Sales history & valuation
Kelvin has more than doubled in price since the earliest registered sale in 2006.
£444,000
Modelled from EPC, postcode comparables and a sale-price growth of 4.1% per year over 19 years.
£430,000
Growth on file: 4.1% per year over 19 years.
Sales timeline
3 September 2024Most recent
£430,000
+45.8%over 10 years26 June 2014
£295,000
+43.9%over 8 years27 February 2006
£205,000
Median price across the last 5 sales in TN15 8LZ: £650,000 (2024–2015).
Nearby sales in TN15 8LZ
Mill House, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
Sold Dec 2024
£1,210,0002 Church Villas, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
Sold Mar 2019
£367,500Romney House, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
Sold Aug 2018
£650,000Dalesfield, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
Sold Jan 2016
£800,0003 Church Villas, Long Mill Lane, Platt, Sevenoaks, TN15 8LZ
Sold Oct 2015
£336,500
Everything we know about Kelvin, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?

Versus other Long Mill Lane homes
Kelvin outperforms the street on price per m² by a wide margin.
Price per m²
£6,154
Street avg £3,738
Floor Area
70 m²
Street avg 150 m²
Habitable Rooms
4 rooms
Street avg 7 rooms
CO₂ Emissions
4.6 t/year
Street avg 7.3 t/year
Similar properties nearby
1 Fairview Cottages, Crouch Lane, Borough Green
TN15 8QL
1 Annetts Hall, Borough Green
TN15 8DY
1 Black Horse Mews, Borough Green
TN15 8SP
1 Brickmakers Meadows, Platt
TN15 8NQ
1 Crow Hill Road, Borough Green
TN15 8HH
1 Ascot Close, Borough Green
TN15 8HL
1 Allingham Close, Borough Green
TN15 8FX
1 Church Villas, Long Mill Lane, Platt
TN15 8LZ
The neighbourhood at a glance
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
Flour Mill — bus stop.
Closest school
0.4 km
Platt Church of England Voluntary Aided Primary School. 4 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
47.2dB

Night-time· 23:00 – 07:00
39.5dB