Flat 1, 8 Belsize Lane, London, NW3 5AB
About Flat 1
Flat 1 is a semi-detached house in London (NW3 5AB). It has a recorded floor area of 137 m² (around 1475 sq ft), construction records dating it to before 1900 and council tax band F. The latest certificate (February 2024) shows a D (score 64), on the cusp of jumping into the C band. The rating has held steady at D across 3 certificates since April 2010. Between certificates, window efficiency went from Poor to Average; while roof efficiency dropped from Very Good to Poor and lighting dropped from Average to Poor. The recommended improvements would push it to C (score 79).
At 137 m² it's 25.7% larger than the typical home in the postcode (109 m² median across 26 EPCs). Across 1996–2021, sale prices on this property compounded at 7.5% per year. Today's modelled estimate of £1,690,000 is 13% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£1,014/sq ft) was about 54.4% above the typical sold price in the postcode. Last sale on file: £1,495,000 in November 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
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
EPC Rating
Property Improvements
Changes detected from historical EPC data
More low energy lighting installed
Single glazing replaced with double or better glazing
Low energy lighting percentage decreased
Planning history
Flat 1 has no planning applications on record.
Notable planning nearby
2applications of note in the surrounding area
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
Price for Flat 1 has grown more than fourfold since the 1996 starting point.
£1,690,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.5% per year over 26 years.
£1,495,000
Growth on file: 7.5% per year over 26 years.
Sales timeline
17 November 2021Most recent
£1,495,000
+85.7%over 14 years4 April 2007
£805,001
+73.1%over 5 years13 March 2002
£465,000
+50.0%over 3 years23 December 1998
£310,000
+30.3%over 2 years9 May 1996
£238,000
Median price across the last 5 sales in NW3 5AB: £1,350,000 (2025–2023).
Nearby sales in NW3 5AB
16 18a, Belsize Lane, Camden, London, NW3 5AB
Sold Oct 2025
£954,000Rosslyn Heights, Flat 2, 2 Belsize Lane, London, NW3 5AB
Sold Oct 2024
£1,350,000Rosslyn Heights, Flat 5, 2 Belsize Lane, London, NW3 5AB
Sold Apr 2024
£1,925,00018 Belsize Lane, London, NW3 5AB
Sold Nov 2023
£825,00022 Belsize Lane, London, NW3 5AB
Sold Aug 2023
£3,250,000
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 Lane homes
Flat 1 outperforms the street on habitable rooms by a wide margin.
Price per m²
£10,912
Street avg £12,040
Floor Area
137 m²
Street avg 111 m²
Habitable Rooms
5 rooms
Street avg 4 rooms
CO₂ Emissions
5.2 t/year
Street avg 4.2 t/year
Similar properties nearby
14 15, Flat 1 4, College Crescent, Camden
NW3 5LL
122b, Flat 2, Finchley Road
NW3 5HT
122b, Flat 1, Finchley Road
NW3 5HT
17a, Flat 1, Fitzjohns Avenue
NW3 5JY
14 15, Flat 3, College Crescent
NW3 5LL
122b, Flat 5, Finchley Road
NW3 5HT
24 28, Flat 13, Buckland Crescent, Camden
NW3 5DU
24 28, Flat 14, Buckland Crescent, Camden
NW3 5DU
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
Rosslyn Hill — bus stop.
Closest school
0.2 km
Rosary Catholic Primary School. 59 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
52.7dB

Night-time· 23:00 – 07:00
42.2dB