15 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
About 15 Castleton Avenue
15 Castleton Avenue is a semi-detached house in Treherbert, Treorchy, Treorchy (CF42 5SS). It has a recorded floor area of 79 m² (around 850 sq ft), construction records dating it to 1950-1966 and council tax band A. The latest certificate (March 2017) shows an E (score 52), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 80), a 2-band jump.
Across 2017–2022, sale prices on this property compounded at 10.2% per year. Today's modelled estimate of £136,000 sits 88.9% above the 2022 sale of £72,000. At 79 m² it's 23.7% smaller than the typical home in the postcode (104 m² median across 22 EPCs). Sold March 2022 for £72,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 15 Castleton Avenue
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
15 Castleton Avenue's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Planning history
15 Castleton Avenue has no planning applications on record.
Notable planning nearby
6applications of note in the surrounding area
We flagged 1 thing worth checking at 15 Castleton Avenue
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.
- Signs of HMO activity in the area
30-day money-back guarantee
Sales history & valuation
15 Castleton Avenue's estimated value is more than triple its earliest registered sale price (2017).
£136,000
Modelled from EPC, postcode comparables and a sale-price growth of 10.2% per year over 5 years.
£72,000
Growth on file: 10.2% per year over 5 years.
Sales timeline
4 March 2022Most recent
£72,000
+60.2%over 4 years25 April 2017
£44,950
Median price across the last 5 sales in CF42 5SS: £130,000 (2025–2022).
Nearby sales in CF42 5SS
25 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
Sold Jul 2025
£130,00014 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
Sold Jul 2025
£185,000Fernhill House, Castleton Avenue, Treherbert, Treorchy, CF42 5SS
Sold Dec 2023
£395,0003 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
Sold Nov 2022
£130,00026 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
Sold Aug 2022
£125,000
Everything we know about 15 Castleton Avenue, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Signs of HMO activity in the area

Versus other Castleton Avenue homes
On habitable rooms, 15 Castleton Avenue runs well behind the street norm.
Price per m²
£911
Street avg £1,011
Floor Area
79 m²
Street avg 111 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
6.4 t/year
Street avg 6.3 t/year
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The neighbourhood at a glance
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Steps — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.