Flat 1, 15 Belsize Park, London, NW3 4ES
About Flat 1
Flat 1 is a detached house in London (NW3 4ES). It has a recorded floor area of 101 m² (around 1090 sq ft), construction records dating it to before 1900 and council tax band G. At 101 m² this is the 2nd smallest of 3 units on EPC record in the building, where floor areas span 98–170 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (October 2010) shows a D (score 63), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since March 2010. Between certificates, hot-water efficiency went from Good to Very Good and main heating went from Good to Very Good. The latest certificate is from October 2010, so improvements made since then won't be reflected.
At 101 m² the property is well over the postcode median (64 m² across 35 EPCs), placing it in the larger end of the local stock. One planning record on file: tree works approved in 2023. Past consents include tree works, meaningful when judging how the property has evolved.
Know exactly what you're buying at Flat 1
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
Flat 1'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This certificate is over 10 years old and is no longer valid.Expired 14 Oct 2020
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency improved
Planning history
- Jul 2023Tree WorksTreesIn report
REAR GARDEN: 1 x Chestnut Tree (T1) - Reduce height and spread by 1.5m circa to suitable pruning points.
- Documents
- 3 docs on file
- Reference
- 2023/2297/T
We flagged 1 thing worth checking at Flat 1
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
Flat 1 has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£1,210,000
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 Flat 1, 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 co₂ emissions, Flat 1 runs well behind the street norm.
EPC Rating
63 (D)
Street avg 66 (D)
Floor Area
101 m²
Street avg 83 m²
CO₂ Emissions
4.6 t/year
Street avg 3.4 t/year
Habitable Rooms
3 rooms
Street avg 3 rooms
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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