12 Sebastopol Street, St Thomas, Swansea, SA1 8BN
About 12 Sebastopol Street
12 Sebastopol Street is a mid-terrace house in St. Thomas, Swansea, Swansea (SA1 8BN). It has a recorded floor area of 130 m² (around 1399 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (January 2016) shows an F (score 33), near the bottom of the EPC scale. Earlier certificates rated it D (July 2014); the latest reading is 2 bands lower. Between certificates, window efficiency dropped from Good to Average. The recommended improvements would lift it to D (score 55), a 2-band jump. The latest certificate is from January 2016, so improvements made since then won't be reflected.
At 130 m² the property is well over the postcode median (80 m² across 22 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £169,000 is 30% above the 2022 sale price. Most recent transfer: September 2022 at £130,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Everything you need to know about 12 Sebastopol Street
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
12 Sebastopol Street sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 11 Jan 2026
EPC Rating
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, has been extended more than once, and has solid (non-cavity) walls, we believe a Level 3 building survey should be considered.
From £820 · Includes VAT
Planning history
12 Sebastopol Street has no planning applications on record.
But the area is active
53 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£169,000
Modelled from EPC, postcode comparables.
£130,000
Recorded with HM Land Registry.
Sales timeline
7 September 2022Most recent
£130,000
Median price across the last 5 sales in SA1 8BN: £125,000 (2022–2018).
Nearby sales in SA1 8BN
27 Sebastopol Street, St Thomas, Swansea, SA1 8BN
Sold Jun 2022
£150,00031 Sebastopol Street, St Thomas, Swansea, SA1 8BN
Sold Jul 2021
£122,00021 Sebastopol Street, St Thomas, Swansea, SA1 8BN
Sold Nov 2020
£125,00036 Sebastopol Street, St Thomas, Swansea, SA1 8BN
Sold Dec 2018
£128,0005 Sebastopol Street, St Thomas, Swansea, SA1 8BN
Sold Sept 2018
£114,000
Versus other Sebastopol Street homes
12 Sebastopol Street is notably below the street on years held.
Price per m²
£1,000
Street avg £1,149
Floor Area
130 m²
Street avg 87 m²
Habitable Rooms
9 rooms
Street avg 5 rooms
CO₂ Emissions
10.0 t/year
Street avg 4.0 t/year
Everything you need to know about 12 Sebastopol Street
The true value, the hidden risks and the full sale history, in one report.
Pick your report · every report is £14.99
One time fee only - money back guarantee

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The neighbourhood at a glance
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Thomas Church — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.






