A typical house in Blackfen sells for about £466,000. Flats come in under £300,000. A semi costs well over half a million. The three-bedroom house is the standard purchase, and almost everyone wants the semi-detached version of it.
The Land Registry recorded 280 sales in Blackfen in the year to May 2026, with a median price of about £466,000. By type, the 49 flats went for a median of about £295,000, the 117 terraced houses about £445,000 and the 96 semis about £585,000. The 18 detached houses fetched about £762,000, though 18 is a small enough sample for one large plot to move the figure. Terraces were the most common sale, and semis cost the most money short of a detached house. The interwar semi is the house Blackfen is known for, and its owners know exactly what a side return is worth.
The official house price index put the area's average at about £409,000 in May 2026, up 2.2% on a year earlier. Flats on the same index were down 0.5% over the year. Neither is a big move. Houses edged up and flats edged down, and the gap between them got slightly wider. Because the index average is lower than the Land Registry median, expect a listing to quote whichever figure makes the asking price look reasonable.
Band D is the most common council tax band, and only 8% of homes are in bands A or B, the two cheapest. A band D bill in Bexley is about £2,370 a year. A buyer moving out of a band B flat elsewhere should budget for the step up along with the mortgage.
Bexley's private rents averaged about £1,520 a month in April 2026 across the whole borough, up about 7% in a year. The Office for National Statistics publishes that figure as a mean from its rental index, and it covers far more than Blackfen. By bedroom, the same borough figures run from about £1,220 for one bedroom and £1,500 for two to about £1,850 for three and £2,410 for four or more. The index does not publish a figure for studios or rooms.
The Office for National Statistics models median household income across Blackfen at about £81,000 a year, gross, for the financial year to March 2023. That is before tax, it is three years old, and it is an estimate averaged across the area. It sits comfortably against a terrace for a couple who both earn, and less comfortably against a semi. A single buyer on one salary will mostly be looking at the flats.
Of the sales that could be matched to an energy certificate, 87% of the total, the median price was about £5,800 per square metre, and the typical floor area behind that figure was about 83 square metres. That is a family-sized house, with interwar room proportions. Check the floor area on the certificate of any house you are serious about, because two semis on the same road can differ by a bedroom's worth of extension.
The 2021 census shows what is actually on offer. Three-bedroom homes make up 43% of households, four or more bedrooms 27%, two bedrooms 23% and one bedroom 7%. A buyer hunting for a one-bed will find slim pickings. Someone searching for a three-bed will meet the same rival buyers at every viewing.
Blackfen's prices are middling for this corner of south-east London. A family house costs the full going rate and nothing about the place discounts it, but the money buys a proper three-bedroom home and little that needs explaining.