12a, Flat 1, Belsize Park, London, NW3 4ES
About 12a
12a is a semi-detached house in London (NW3 4ES). It has a recorded floor area of 56 m² (around 603 sq ft) and construction records dating it to before 1900. At 56 m² this is the smallest unit on EPC record across 12a (56–111 m²). The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (59 versus a best of 71). The latest certificate (March 2014) shows a D (score 59), a step below the typical UK home. The recommended improvements would push it to C (score 79). The latest certificate is from March 2014, so improvements made since then won't be reflected.
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
12a's EPC is over a decade old — improvements since won't be reflected.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 12 Mar 2024
EPC Rating
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.
£594,000
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 epc rating.
EPC Rating
59 (D)
Street avg 66 (D)
Floor Area
56 m²
Street avg 85 m²
CO₂ Emissions
3.0 t/year
Street avg 3.5 t/year
Habitable Rooms
3 rooms
Street avg 3 rooms
Similar properties nearby
25a, Flat 1, Elizabeth Mews
NW3 4UH
25a, Flat 2, Elizabeth Mews
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12a, Flat 2, Belsize Park
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15a, Flat B, Eton Road
NW3 4SS
15a, Flat A, Eton Road, Camden
NW3 4SS
23a, Garden Flat, Belsize Square, Camden
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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