17b, Belsize Square, London, NW3 4HT
About 17b
17b is a semi-detached house in London (NW3 4HT). It has a recorded floor area of 102 m² (around 1098 sq ft) and construction records dating it to 1900-1929. The latest certificate (April 2012) shows a D (score 59), a step below the typical UK home. When first surveyed in October 2009 the rating was E, the property has climbed 1 band since. The recommended improvements would lift it to B (score 81), a 2-band jump. The latest certificate is from April 2012, so improvements made since then won't be reflected. At 102 m² this is the 35th smallest of 52 units on EPC record in the building, where floor areas span 39–211 m². The building's EPC ratings span F to C across 52 units on file.
3 planning records sit against the property, 0 approved, 0 refused.
Know exactly what you're buying at 17b
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
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 04 Apr 2022
EPC Rating
Property Improvements
Changes detected from historical EPC data
Planning history
Planning history at 17b is exclusively tree-management applications — typical for a property with mature trees on or near the plot.
- Jul 2020Tree WorksTreesIn report
REAR GARDEN: 1 x Ash (T1) - Reduce crown by 30%, 2.5m of height and 2m width. 1 x Sycamore (T2) - Reduce crown by 30%, 3m of height and 2m width.
- Documents
- 4 docs on file
- Reference
- 2020/2417/T
- Feb 2004Tree WorksTreesIn report
REAR GARDEN 1 x Laburnum - fell.
- Documents
- 2 docs on file
- Reference
- 2004/0289/T
We flagged 1 thing worth checking at 17b
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
17b has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£928,000
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 4HT: £1,000,000 (2024–2022).
Nearby sales in NW3 4HT
Flat 5, 8 Belsize Square, London, NW3 4HT
Sold Nov 2024
£1,090,000Flat B, 10 Belsize Square, London, NW3 4HT
Sold Sept 2023
£617,500Flat 4, 22 Belsize Square, London, NW3 4HT
Sold Aug 2022
£1,330,000Flat 5, 22 Belsize Square, London, NW3 4HT
Sold May 2022
£1,000,0004e, Belsize Square, London, NW3 4HT
Sold Mar 2022
£519,000
Everything we know about 17b, 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 Square homes
On epc rating, 17b runs well behind the street norm.
EPC Rating
59 (D)
Street avg 65 (D)
Floor Area
102 m²
Street avg 92 m²
CO₂ Emissions
4.7 t/year
Street avg 3.7 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. 70 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
53.9dB

Night-time· 23:00 – 07:00
42.9dB