12a, Flat 2, Belsize Park, London, NW3 4ES
About 12a
12a is a semi-detached house in London (NW3 4ES). It has a recorded floor area of 63 m² (around 678 sq ft) and construction records dating it to 1900-1929. At 63 m² this is the 2nd smallest of 3 units on EPC record in 12a, where floor areas span 56–111 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (February 2025) shows a D (score 66), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since November 2012. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 79).
Know exactly what you're buying at 12a
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
12a has no planning applications on record.
Notable planning nearby
3applications of note in the surrounding area
We flagged 1 thing worth checking at 12a
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
12a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£656,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
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 12a, 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
12a is notably below the street on habitable rooms.
EPC Rating
66 (D)
Street avg 66 (D)
Floor Area
63 m²
Street avg 84 m²
CO₂ Emissions
2.7 t/year
Street avg 3.5 t/year
Habitable Rooms
2 rooms
Street avg 3 rooms
Similar properties nearby
15a, Flat B, Eton Road
NW3 4SS
12a, Flat 1, Belsize Park
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25a, Flat 1, Elizabeth Mews
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15a, Flat A, Eton Road, Camden
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25a, Flat 2, Elizabeth Mews
NW3 4UH
23a, Garden Flat, Belsize Square, Camden
NW3 4HU
15a, Flat C, Eton Road
NW3 4SS
17a, Flat 2, Lambolle Road, Camden
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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