18 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
About 18 Castleton Avenue
18 Castleton Avenue is a semi-detached house in Treherbert, Treorchy, Treorchy (CF42 5SS). It has a recorded floor area of 82 m² (around 883 sq ft), construction records dating it to 1967-1975 and council tax band A. The latest certificate (November 2025) shows a C (score 69), just inside the C band. When first surveyed in June 2009 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good and main heating went from Average to Good; while window efficiency dropped from Average to Poor. This certificate was lodged in the last six months, so the rating reflects current condition.
At 82 m² it's 20.8% smaller than the typical home in the postcode (104 m² median across 22 EPCs).
Know exactly what you're buying at 18 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
The EPC has just been inspected, so the rating reflects current condition.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency improved
More low energy lighting installed
Planning history
18 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 18 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
18 Castleton Avenue has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£131,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
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 18 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
18 Castleton Avenue outperforms the street on co₂ emissions by a wide margin.
EPC Rating
69 (C)
Street avg 60 (D)
Floor Area
82 m²
Street avg 111 m²
CO₂ Emissions
3.3 t/year
Street avg 6.4 t/year
Habitable Rooms
4 rooms
Street avg 5 rooms
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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.