Garnllwydwen, Llandyfan, Ammanford, SA18 2UB
About Garnllwydwen
Garnllwydwen is a detached house in Llandyfan, Ammanford, Ammanford (SA18 2UB). It has a recorded floor area of 143 m² (around 1539 sq ft) and construction records dating it to before 1900. The latest certificate (June 2022) shows a G (score 8), near the bottom of the EPC scale. Earlier certificates rated it F (March 2010); the latest reading is one band lower. Between certificates, window efficiency went from Poor to Average and lighting went from Poor to Very Good; while roof efficiency dropped from Average to Poor and hot-water efficiency dropped from Average to Very Poor. The recommended improvements would lift it to A (score 94), a 6-band jump. Main heating runs on electricity.
Untraded for 15 years, with the last transfer in December 2010. Today's modelled estimate of £451,000 is 34% above the 2010 sale price. On a £-per-square-foot basis, the last sale (£219/sq ft) was about 56.1% above the typical sold price in the postcode. One historical planning record sits against the property in 2010.
Know exactly what you're buying at Garnllwydwen
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
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Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
Garnllwydwen's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating system changed
Changed to a more efficient fuel source
Heating controls upgraded for better temperature management
Hot water system changed
Windows upgraded, improving insulation
More low energy lighting installed
Planning history
- May 2010OtherIn report
Building for agricultural use (hay and machinery storage)
- Agent
- Davies Richards Designs
- Reference
- 10/04686/AGR
We flagged 1 thing worth checking at Garnllwydwen
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
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Sales history & valuation
Garnllwydwen valuation sits well clear of the typical sold price in this postcode.
£451,000
Modelled from EPC, postcode comparables.
£336,500
Recorded with HM Land Registry.
Sales timeline
10 December 2010Most recent
£336,500
Median price across the last 5 sales in SA18 2UB: £185,000 (2024–2011).
Nearby sales in SA18 2UB
1 Carreg Y Dwfn, Llandyfan, Ammanford, SA18 2UB
Sold Jul 2024
£452,500Glanquay, Llandyfan, Ammanford, SA18 2UB
Sold Sept 2021
£405,000Lletty Forge, Llandyfan, Ammanford, SA18 2UB
Sold Sept 2019
£154,000Lletty Forge Barn, Llandyfan, Ammanford, SA18 2UB
Sold Aug 2019
£86,500Forge Mill, Llandyfan, Ammanford, SA18 2UB
Sold Jun 2011
£185,000
Everything we know about Garnllwydwen, 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 the street
EPC Rating
8 (G)
Street avg 31 (F)
Floor Area
143 m²
Street avg 143 m²
CO₂ Emissions
13.0 t/year
Street avg 7.9 t/year
Habitable Rooms
6 rooms
Street avg 6 rooms
Similar properties nearby
The neighbourhood at a glance
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.7 km
Art & Craft Centre — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.