20b, Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
About 20b
20b is a two-bedroom detached house in Llangain, Carmarthen, Carmarthen (SA33 5BE). It has a recorded floor area of 113 m² (around 1216 sq ft), construction records dating it to 2025 and council tax band C. The latest certificate (July 2025) returns a high B (score 85), putting the home a stone's throw from an A rating. When first surveyed in August 2020 the rating was C, the property has climbed 1 band since. Between certificates, wall efficiency went from Good to Very Good, window efficiency went from Average to Good and hot-water efficiency went from Average to Very Good; while lighting dropped from Very Good to Good. The recommended improvements would push it to A (score 92). Main heating runs on electricity: electricity, unspecified tariff.
Today's modelled estimate of £212,000 sits 77.4% above the 2022 sale of £119,500. On a £-per-square-foot basis, the last sale (£98/sq ft) was about 37.2% below the postcode norm. At 113 m² it's 27% larger than the typical home in the postcode (89 m² median across 52 EPCs). Sold April 2022 for £119,500. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 20b
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Launch offer · save £5
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms2
- Bathrooms1
Energy performance
20b's carbon output is low for the local stock.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heat pump installed, significantly improving energy efficiency
Hot water system upgraded
High performance glazing installed
Wall insulation improved
Floor insulation added or improved
Planning history
20b has no planning applications on record.
Notable planning nearby
4applications of note in the surrounding area
We flagged 1 thing worth checking at 20b
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
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£212,000
Modelled from EPC, postcode comparables.
£119,500
Recorded with HM Land Registry.
Sales timeline
11 April 2022Most recent
£119,500
Median price across the last 5 sales in SA33 5BE: £270,000 (2025–2022).
Nearby sales in SA33 5BE
25 Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
Sold Feb 2025
£240,00017 Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
Sold Sept 2024
£330,00053 Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
Sold Jul 2023
£327,0008 Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
Sold Feb 2023
£250,00043 Dol Y Dderwen, Llangain, Carmarthen, SA33 5BE
Sold Oct 2022
£345,000
Everything we know about 20b, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby
Versus other Dol Y Dderwen homes
On price per m², 20b runs well behind the street norm.
Price per m²
£1,058
Street avg £2,025
Floor Area
113 m²
Street avg 95 m²
CO₂ Emissions
0.4 t/year
Street avg 1.8 t/year
Years Held
4 years
Street avg 12 years
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The neighbourhood at a glance
Crime
4/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Capel Smyrna — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.