21 Western Street, Swansea, SA1 3JZ
About 21 Western Street
21 Western Street is a mid-terrace house in Swansea (SA1 3JZ). It has a recorded floor area of 88 m² (around 947 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (January 2026) shows a D (score 63), on the cusp of jumping into the C band. When first surveyed in January 2016 the rating was E, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 80).
Untraded for 23 years, with the last transfer in August 2003. Across 2003–2003, sale prices on this property compounded at 71.3% per year. Today's modelled estimate of £144,000 sits 140.2% above the 2003 sale of £59,950. On a £-per-square-foot basis, the last sale (£63/sq ft) was about 45.3% below the postcode norm.
Everything you need to know about 21 Western Street
The true value, the hidden risks and the full sale history, in one report.
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The data behind every report
Energy performance
EPC Rating
Certificate validity
Valid until 19 January 2036
Property Improvements
Changes detected from historical EPC data
Roof insulation improved
More low energy lighting installed
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, we believe a Level 3 building survey should be considered.
From £820 · Includes VAT
Planning history
21 Western Street has no planning applications on record.
But the area is active
28 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
21 Western Street's modelled value sits at over four times its earliest registered sale price (2003).
£144,000
Modelled from EPC, postcode comparables and a sale-price growth of 71.3% per year over 1 year.
£59,950
Growth on file: 71.3% per year over 1 year.
Sales timeline
28 August 2003Most recent
£59,950
+71.3%22 June 2003
£35,000
Median price across the last 5 sales in SA1 3JZ: £171,500 (2025–2023).
Nearby sales in SA1 3JZ
Versus other Western Street homes
Price per m² for 21 Western Street lags the street by a wide margin.
Price per m²
£681
Street avg £1,436
Floor Area
88 m²
Street avg 96 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
3.2 t/year
Street avg 3.6 t/year
Everything you need to know about 21 Western Street
The true value, the hidden risks and the full sale history, in one report.
Pick your report · from £14.99
One time fee only - money back guarantee
The data behind every report
Similar properties nearby
The neighbourhood at a glance
Crime
580/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
YMCA — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.