18 First Avenue, Clase, Swansea, SA6 7LL
About 18 First Avenue
18 First Avenue is a mid-terrace house in Clase, Swansea, Swansea (SA6 7LL). It has a recorded floor area of 69 m² (around 743 sq ft), construction records dating it to 1967-1975 and council tax band B. The latest certificate (November 2016) shows a C (score 70). When first surveyed in May 2013 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Poor to Good; while lighting dropped from Very Good to Average. The recommended improvements would push it to B (score 84).
Across 2002–2019, sale prices on this property compounded at 7.9% per year. Today's modelled estimate of £134,000 sits 52.3% above the 2019 sale of £88,000. Sold June 2019 for £88,000. Across the public record there are 5 sales, relatively high churn for a single property.
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Roof insulation improved
Low energy lighting percentage decreased
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Planning history
18 First Avenue has no planning applications on record.
A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.
Sales history & valuation
18 First Avenue has more than tripled in price since its earliest registered sale in 2002.
£134,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.9% per year over 17 years.
£88,000
Growth on file: 7.9% per year over 17 years.
Sales timeline
4 June 2019Most recent
£88,000
+109.5%over 2 years14 December 2016
£42,000
-50.6%over 9 years12 April 2007
£85,000
+129.7%over 3 years15 April 2003
£37,000
+48.0%28 October 2002
£25,000
Median price across the last 5 sales in SA6 7LL: £100,000 (2023–2017).
Versus other First Avenue homes
EPC Rating for 18 First Avenue runs comfortably ahead of the street norm.
Price per m²
£1,275
Street avg £1,449
Floor Area
69 m²
Street avg 74 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
2.4 t/year
Street avg 3.6 t/year
Similar properties nearby
The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Pengwern Road — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







