Mynydd Glas, Barrett Street, Treorchy, CF42 6LN
About Mynydd Glas
Mynydd Glas is a detached house in Treorchy (CF42 6LN). It has a recorded floor area of 158 m² (around 1701 sq ft), construction records dating it to 2003-2006 and council tax band E. The latest certificate (October 2015) returns a high B (score 89), putting the home a stone's throw from an A rating. The latest certificate is from October 2015, so improvements made since then won't be reflected.
At 158 m² the property is well over the postcode median (75 m² across 21 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the top 10% of properties in this postcode. Across 2015–2021, sale prices on this property compounded at 17% per year. Today's modelled estimate of £355,000 is 26.8% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£165/sq ft) was about 129% above the typical sold price in the postcode. Last sale on file: £280,000 in August 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at Mynydd Glas
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
Mynydd Glas ranks among the most efficient homes in the postcode for energy use.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 20 Oct 2025
EPC Rating
Planning history
Mynydd Glas has no planning applications on record.
The full report still covers planning activity across the surrounding area.
Sales history & valuation
Latest sale on Mynydd Glas was the highest on Land Registry record across the postcode.
£355,000
Modelled from EPC, postcode comparables and a sale-price growth of 17.0% per year over 7 years.
£280,000
Growth on file: 17.0% per year over 7 years.
Sales timeline
1 August 2021Most recent
£280,000
+180.0%over 6 years15 January 2015
£100,000
Median price across the last 5 sales in CF42 6LN: £120,000 (2025–2022).
Nearby sales in CF42 6LN
Everything we know about Mynydd Glas, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?

Versus other Barrett Street homes
Price per m² for Mynydd Glas runs comfortably ahead of the street norm.
Price per m²
£1,772
Street avg £932
Floor Area
158 m²
Street avg 83 m²
Habitable Rooms
7 rooms
Street avg 5 rooms
CO₂ Emissions
3.6 t/year
Street avg 4.8 t/year
Similar properties nearby
The neighbourhood at a glance
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Park Street — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.