15a, Belsize Park, London, NW3 4ES
About 15a
15a is a semi-detached house in London (NW3 4ES). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 1900-1929 and council tax band E. The latest certificate (November 2023) shows a D (score 64), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since April 2012. Between certificates, lighting went from Average to Very Good. The recommended improvements would push it to C (score 74).
Across 1998–2011, sale prices on this property compounded at 11% per year. On a £-per-square-foot basis, the last sale (£1,527/sq ft) was about 175.4% above the typical sold price in the postcode. Last sold in September 2011, so it's been off the market for around 15 years.
Know exactly what you're buying at 15a
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
Heating controls upgraded for better temperature management
More low energy lighting installed
Planning history
15a has no planning applications on record.
Notable planning nearby
3applications of note in the surrounding area
We flagged 1 thing worth checking at 15a
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
15a has more than quadrupled in price since its earliest registered sale in 1998.
£994,000
Modelled from EPC, postcode comparables and a sale-price growth of 11.0% per year over 14 years.
£970,000
Growth on file: 11.0% per year over 14 years.
Sales timeline
5 September 2011Most recent
£970,000
+169.4%over 11 years7 March 2000
£360,000
+53.2%over 2 years27 January 1998
£235,000
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 15a, 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
Price per m² for 15a runs comfortably ahead of the street norm.
Price per m²
£16,441
Street avg £7,927
Floor Area
59 m²
Street avg 85 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
2.8 t/year
Street avg 3.5 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
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