20 Heol Seion, Llangennech, Llanelli, SA14 8TZ
About 20 Heol Seion
20 Heol Seion is a semi-detached house in Llangennech, Llanelli, Llanelli (SA14 8TZ). It has a recorded floor area of 57 m² (around 614 sq ft), construction records dating it to 1983-1990 and council tax band C. The latest certificate (April 2018) shows a C (score 72). When first surveyed in October 2012 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good and lighting went from Good to Very Good; while roof efficiency dropped from Good to Average. The recommended improvements would push it to B (score 90).
Across 2013–2015, sale prices on this property compounded at 8.4% per year. Today's modelled estimate of £170,000 sits 120.8% above the 2015 sale of £77,000. Its energy rating outperforms most of the postcode (better than 71% of similar EPCs). 11 years since the last transfer (November 2015).
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency improved
More low energy lighting installed
Planning history
20 Heol Seion has no planning applications on record.
Notable planning nearby
5applications of note in the surrounding area
We flagged 1 thing worth checking at 20 Heol Seion
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Larger development activity nearby
30-day money-back guarantee
Sales history & valuation
20 Heol Seion valuation sits well clear of the typical sold price in this postcode.
£170,000
Modelled from EPC, postcode comparables and a sale-price growth of 8.4% per year over 2 years.
£77,000
Growth on file: 8.4% per year over 2 years.
Sales timeline
20 November 2015Most recent
£77,000
+22.2%over 2 years30 May 2013
£63,000
Median price across the last 5 sales in SA14 8TZ: £180,000 (2024–2022).
Nearby sales in SA14 8TZ
16 Heol Seion, Llangennech, Llanelli, SA14 8TZ
Sold Aug 2024
£180,00026 Heol Seion, Llangennech, Llanelli, SA14 8TZ
Sold Feb 2023
£195,00024 Heol Seion, Llangennech, Llanelli, SA14 8TZ
Sold Jan 2023
£145,00013 Heol Seion, Llangennech, Llanelli, SA14 8TZ
Sold May 2022
£249,95015 Heol Seion, Llangennech, Llanelli, SA14 8TZ
Sold May 2022
£172,500
Versus other Heol Seion homes
Floor Area for 20 Heol Seion lags the street by a wide margin.
Price per m²
£1,351
Street avg £2,042
Floor Area
57 m²
Street avg 63 m²
Habitable Rooms
3 rooms
Street avg 4 rooms
CO₂ Emissions
2.1 t/year
Street avg 2.8 t/year
Similar properties nearby
The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Heol Plas Isaf — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.







