Second Floor Flat 9 Belsize Avenue

NW3 4BL

Flat
Leasehold

What the sales records show

From an older sale: a rough guide

£1,025,000

Range £871,000 to £1,179,000

Since last sale

+£375,000

+57.7% since Jan 2008, +2.5% a year

There is no floor area on record, so this is the home's last sale moved from January 2008 to August 2026 by the official UK House Price Index for Camden, with the range widened the older the sale. It cannot see condition, layout or recent work, so it is not a valuation.

In short

Second Floor Flat 9 Belsize Avenue is a leasehold flat in NW3.

There is no floor area on record, so its last sale has been moved to today by the official price index for Camden: £871,000 to £1,179,000, about £1,025,000 in the middle.

It last sold for £650,000 in January 2008; the price index suggests it has gained about £375,000 since, roughly +2.5% a year.

Across Camden, average prices fell 10.6% in the year to August 2026.

Where in the range would yours sell?

Condition and improvements usually decide it, and only someone who sees the home can say.

Lower end

£871,000

Middle

£1,025,000

Upper end

£1,179,000

Done work since the records were made? Claim your home and tell us, or ask local agents where yours sits.

Belsize Avenue at a glance

Completed sales on the road in the last two years

Sales

Average price

£768k

Average size

722 sq ft

Per sq ft

£925

Price range

£360k to £1.88m

See every sale on Belsize Avenue →

Sale history

Every sale of this home registered with HM Land Registry since 1995

Sold	Price paid	Change	A year
January 2008	£650,000	+58.5%	+24.4%
November 2005	£410,000	First sale	–

Homes in NW3 4BL

Ranked by what comparable sales show. Choose one to see its page.

Recent sales of flat homes nearby

The closest sales of the same type in the last two years, registered with HM Land Registry. Choose one to see its page.

Home	Price	Sold	Size	Per sq ft	Away
Flat 7, 27 Belsize AvenueNW3 4BL · Flat	£700,000	Apr 2026	1,076 sq ft	£650	< 0.1 mi
Flat 26, 15 Belsize AvenueNW3 4BL · Flat	£780,000	Nov 2025	1,012 sq ft	£771	< 0.1 mi
Flat 3, 21 Belsize AvenueNW3 4BL · Flat	£550,000	Mar 2025	549 sq ft	£1,002	< 0.1 mi
Flat 3, 5 Belsize AvenueNW3 4BL · Flat	£1,135,000	Feb 2025	840 sq ft	£1,352	< 0.1 mi
Apartment 5, 21 Belsize LaneNW3 5AS · Flat	£2,500,000	Jun 2025	–	–	< 0.1 mi
Apartment 3, 21 Belsize LaneNW3 5AS · Flat	£2,560,000	Nov 2024	–	–	< 0.1 mi
8 Belsize MewsNW3 5AT · Flat	£1,610,000	Apr 2025	–	–	< 0.1 mi
Flat 2, 22 Belsize AvenueNW3 4AU · Flat	£545,000	Dec 2025	474 sq ft	£1,151	< 0.1 mi
Flat 11, 28 Belsize AvenueNW3 4AU · Flat	£360,000	Oct 2025	484 sq ft	£743	< 0.1 mi
Flat, 7 Belsize TerraceNW3 4AX · Flat	£1,120,000	Nov 2024	1,421 sq ft	£788	< 0.1 mi
Flat 2, 6 Lyndhurst GardensNW3 5NR · Flat	£1,320,000	Feb 2025	1,098 sq ft	£1,202	0.1 mi
12B Belsize Park GardensNW3 4LD · Flat	£887,500	Jun 2025	861 sq ft	£1,031	0.1 mi

What buyers have paid in NW3

Completed sales in the last 12 months, against the 12 months before

Type	Sales	Average price	Average size	Per sq ft	On the year
All homes	369	£1,484,239	1,247 sq ft	£1,085	−5.9%
Flats	286	£973,128	900 sq ft	£982	−9.6%
Terraced	40	£2,257,067	1,786 sq ft	£1,335	−14.7%
Semi-detached	21	£4,142,893	2,874 sq ft	£1,530	+0.9%
Detached	12	£5,903,271	3,387 sq ft	£1,420	+2.9%

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