12 Castleton Avenue, Treherbert, Treorchy, CF42 5SS
About 12 Castleton Avenue
12 Castleton Avenue is a semi-detached house in Treherbert, Treorchy, Treorchy (CF42 5SS). It has a recorded floor area of 116 m² (around 1249 sq ft), construction records dating it to before 1900 and council tax band B. The latest certificate (May 2019) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in June 2013 the rating was E, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good, window efficiency went from Average to Good and lighting went from Very Poor to Good. The recommended improvements would lift it to B (score 85), a 2-band jump.
Across 1999–2013, sale prices on this property compounded at 9.1% per year. Today's modelled estimate of £165,000 sits 99.3% above the 2013 sale of £82,800. On a £-per-square-foot basis, the last sale (£66/sq ft) was about 23% below the postcode norm. At 116 m² it's 16.6% larger than the typical home in the postcode (100 m² median across 22 EPCs). Last changed hands 13 years ago, in September 2013.
Know exactly what you're buying at 12 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
12 Castleton Avenue's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Window efficiency improved
Roof insulation improved
More low energy lighting installed
Planning history
12 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 12 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
Sale price has grown by over 3x since 1999.
£165,000
Modelled from EPC, postcode comparables and a sale-price growth of 9.1% per year over 15 years.
£82,800
Growth on file: 9.1% per year over 15 years.
Sales timeline
5 September 2013Most recent
£82,800
+260.0%over 14 years8 January 1999
£23,000
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 12 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
Price per m²
£714
Street avg £1,027
Floor Area
116 m²
Street avg 109 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
6.1 t/year
Street avg 6.3 t/year
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1 Brynfedwen Close, Treherbert
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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.