Flat 5, 11 Belsize Park, London, NW3 4ES
About Flat 5
Flat 5 is a semi-detached house in London (NW3 4ES). It has a recorded floor area of 54 m² (around 581 sq ft), construction records dating it to 1930-1949 and council tax band E. The latest certificate (June 2020) shows a D (score 67), on the cusp of jumping into the C band. Earlier certificates rated it C (January 2009); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 77). At 54 m² this is the 3rd smallest of 6 units on EPC record in the building, where floor areas span 38–110 m². The building's EPC ratings span E to C across 6 units on file.
Across 1996–2023, sale prices on this property compounded at 7.4% per year. Today's modelled estimate of £576,000 is 14.7% below the 2023 sale of £675,000, running counter to the wider postcode trend, which makes the EPC and condition history especially worth a look. On a £-per-square-foot basis, the last sale (£1,161/sq ft) was about 108.5% above the typical sold price in the postcode. At 54 m² it's 16.9% smaller than the typical home in the postcode (65 m² median across 35 EPCs). Sold January 2023 for £675,000.
Know exactly what you're buying at Flat 5
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
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
More low energy lighting installed
Planning history
Flat 5 has no planning applications on record.
Notable planning nearby
3applications of note in the surrounding area
We flagged 1 thing worth checking at Flat 5
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
Price for Flat 5 has grown more than fourfold since the 1996 starting point.
£576,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.4% per year over 26 years.
£675,000
Growth on file: 7.4% per year over 26 years.
Sales timeline
20 January 2023Most recent
£675,000
+552.2%over 26 years29 September 1996
£103,500
Median price across the last 5 sales in NW3 4ES: £800,000 (2025–2023).
Nearby sales in NW3 4ES
Flat 3, 11 Belsize Park, London, NW3 4ES
Sold Mar 2025
£1,350,000Claridge House, Flat 4, 13 Belsize Park, London, NW3 4ES
Sold Oct 2023
£721,500Flat 4, 14 Belsize Park, London, NW3 4ES
Sold Jun 2023
£745,000Flat 4, 16 Belsize Park, London, NW3 4ES
Sold Jun 2023
£1,700,000Flat 1, 11 Belsize Park, London, NW3 4ES
Sold Apr 2023
£800,000
Everything we know about Flat 5, 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 Belsize Park homes
On habitable rooms, Flat 5 runs well behind the street norm.
Price per m²
£12,500
Street avg £8,098
Floor Area
54 m²
Street avg 85 m²
Habitable Rooms
2 rooms
Street avg 3 rooms
CO₂ Emissions
2.3 t/year
Street avg 3.5 t/year
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25a, Flat 2, Elizabeth Mews
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12a, Flat 1, Belsize Park
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12a, Flat 2, Belsize Park
NW3 4ES
15a, Flat B, Eton Road
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15a, Flat A, Eton Road, Camden
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23a, Garden Flat, Belsize Square, Camden
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15a, Flat C, Eton Road
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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
Belsize Square — bus stop.
Closest school
0.5 km
Holy Trinity CofE Primary School, NW3. 67 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
53.1dB
Night-time· 23:00 – 07:00
42.0dB