I guess 'expensive' is relative. I live in East Finchley and they are around ££1-1.3 million. I mean something like this: https://www.rightmove.co.uk/properties/131476742#/?channel=RES_BUY
And this was STC and in the suburb: https://www.rightmove.co.uk/properties/133019909#/?channel=RES_BUY
I think its above average in London for houses and average in London for flats.
Average price by property type for London
Property type March 2022 March 2021 Difference %
Detached £1,069,981 £968,148 10.5
Semi-detached £676,450 £625,379 8.2
Terraced £571,963 £538,252 6.3
Flat/maisonette £435,731 £426,489 2.2
All £523,666 £499,862 4.8
Properties in East Finchley had an overall average price of £1,225,411 over the last year.
The majority of sales in East Finchley during the last year were flats, selling for an average price of £594,165. Terraced properties sold for an average of £1,022,161, with semi-detached properties fetching £1,716,765.
I think the flat data is a bit off probably because a flat in bishops avenue sold of r£2 million, majority of flats in East Finchley are around £400k-550k, and more expensive for 3 beds (but not many of them!).