21 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
About 21 Lock Keepers Court
21 Lock Keepers Court is a mid-terrace house in Cardiff (CF10 3EZ). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (March 2020) shows a C (score 78), near the top of the C band. The rating has held steady at C across 2 certificates since September 2009. Between certificates, window efficiency dropped from Good to Average and hot-water efficiency dropped from Very Good to Very Poor. Main heating runs on electricity. At 73 m² this is the 22nd smallest of 36 units on EPC record in the building, where floor areas span 37–84 m². The building's EPC ratings span D to B across 36 units on file.
Untraded for 21 years, with the last transfer in March 2005. Across 2005–2005, sale prices on this property compounded at -11.5% per year. Today's modelled estimate of £166,000 is 20.3% above the 2005 sale price.
Energy performance
EPC Rating
Certificate validity
Valid until 21 March 2030
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
More low energy lighting installed
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Planning history
21 Lock Keepers Court has no planning applications on record.
But the area is active
6 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
£166,000
Modelled from EPC, postcode comparables and a sale-price growth of -11.5% per year over 1 year.
£137,995
Growth on file: -11.5% per year over 1 year.
Sales timeline
11 March 2005Most recent
£137,995
-11.5%11 March 2005
£156,000
Median price across the last 5 sales in CF10 3EZ: £168,000 (2026–2023).
Nearby sales in CF10 3EZ
2 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
Sold Apr 2026
£161,00023 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
Sold Mar 2026
£172,50033 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
Sold Nov 2025
£170,00028 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
Sold Feb 2024
£150,00013 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ
Sold Aug 2023
£168,000
Versus other Blackweir Terrace homes
Price per m²
£2,137
Street avg £2,230
Floor Area
73 m²
Street avg 68 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
2.0 t/year
Street avg 2.4 t/year
Similar properties nearby
The neighbourhood at a glance
Crime
485/mo
Steady year-on-year across the wider district.
Nearest stop
0.0 km
Blackweir — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







