Cedar House, Flat 6, 109 Thurlow Park Road, London, SE21 8JL
About Cedar House
Cedar House is a one-bedroom mid-terrace house in London (SE21 8JL). It has a recorded floor area of 58 m² (around 624 sq ft), construction records dating it to 1900-1929 and council tax band D. At 58 m² this is the 3rd smallest of 7 units on EPC record in Cedar House, where floor areas span 37–62 m². The building's EPC ratings span D to C, with this unit at the top. On EPC score it ranks first in the building (76 versus a worst of 55). The latest certificate (January 2020) shows a C (score 76), near the top of the C band. Earlier certificates rated it B (June 2012); the latest reading is one band lower. Between certificates, hot-water efficiency went from Average to Good, lighting went from Good to Very Good and main heating went from Average to Good; while wall efficiency dropped from Good to Very Poor and window efficiency dropped from Average to Very Poor. The recommended improvements would push it to B (score 82).
Untraded for 18 years, with the last transfer in October 2008. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Across 2004–2008, sale prices on this property compounded at 0.8% per year. Today's modelled estimate of £400,000 sits 106.7% above the 2008 sale of £193,500. One planning record on file: new windows approved in 2025. Past consents include new windows, meaningful when judging how the property has evolved. At 58 m² it's 29.3% smaller than the typical home in the postcode (82 m² median across 51 EPCs).
Know exactly what you're buying at Cedar House
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms1
- Dining roomYes
Outside
- ParkingAllocated
Building
- RefurbishedYes
Energy performance
Cedar House's carbon output is low for the local stock.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Replaced storage heaters with gas boiler
Connected to mains gas supply
Hot water system upgraded
More low energy lighting installed
Planning history
- May 2025RenovationFullIn report
Replacement of all existing windows, ground floor right flank elevation door with double glazed uPVC windows and a composite door.
- Agent
- Archway Building Consultancy
New Windows- Documents
- 12 docs on file
- Reference
- 25/00911/FUL
We flagged 1 thing worth checking at Cedar House
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Larger development activity nearby
30-day money-back guarantee
Sales history & valuation
The latest sale landed at the peak of the pre-credit-crunch market — a high-water reference point.
£400,000
Modelled from EPC, postcode comparables and a sale-price growth of 0.8% per year over 4 years.
£193,500
Growth on file: 0.8% per year over 4 years.
Sales timeline
14 October 2008Most recent
£193,500
+3.2%over 3 years6 December 2004
£187,500
Median price across the last 5 sales in SE21 8JL: £720,000 (2025–2024).
Nearby sales in SE21 8JL
Apartment 2, 99 Thurlow Park Road, Lambeth, London, SE21 8JL
Sold Mar 2025
£755,000Apartment 6, 99 Thurlow Park Road, Lambeth, London, SE21 8JL
Sold Nov 2024
£730,000Flat 1, 81 Thurlow Park Road, London, SE21 8JL
Sold Aug 2024
£343,000Apartment 8, 99 Thurlow Park Road, Lambeth, London, SE21 8JL
Sold Jun 2024
£720,000Hieover, Flat 2, 101 Thurlow Park Road, Lambeth, London, SE21 8JL
Sold Apr 2024
£450,000
Everything we know about Cedar House, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby

Versus other Thurlow Park Road homes
On floor area, Cedar House runs well behind the street norm.
Price per m²
£3,336
Street avg £4,461
Floor Area
58 m²
Street avg 83 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
1.5 t/year
Street avg 2.7 t/year
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
6/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Lancaster Avenue West Dulwich — bus stop.
Closest school
0.4 km
The Elmgreen School. 63 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
54.3dB

Night-time· 23:00 – 07:00
45.5dB