17 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
About 17 Glanselsig Street
17 Glanselsig Street is a semi-detached house in Blaencwm, Treorchy, Treorchy (CF42 5EB). It has a recorded floor area of 90 m² (around 969 sq ft), construction records dating it to 1900-1929 and council tax band A. The latest certificate (June 2025) shows a C (score 78), near the top of the C band. When first surveyed in December 2017 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good and lighting went from Average to Very Good. The recommended improvements would push it to B (score 90).
At 90 m² the property is well over the postcode median (64 m² across 17 EPCs), placing it in the larger end of the local stock. Across 2005–2018, sale prices on this property compounded at -1.8% per year. Today's modelled estimate of £144,000 sits 170.7% above the 2018 sale of £53,195. On a £-per-square-foot basis, the last sale (£55/sq ft) was about 34% below the postcode norm. Sold October 2018 for £53,195.
Know exactly what you're buying at 17 Glanselsig Street
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
EPC Rating
Property Improvements
Changes detected from historical EPC data
More low energy lighting installed
Heating controls upgraded for better temperature management
Roof insulation improved
Solar PV panels (33 kWp) installed
Planning history
17 Glanselsig Street has no planning applications on record.
Notable planning nearby
6applications of note in the surrounding area
We flagged 1 thing worth checking at 17 Glanselsig Street
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
17 Glanselsig Street's sale-price growth has lagged the wider UK trajectory across its history on file.
£144,000
Modelled from EPC, postcode comparables and a sale-price growth of -1.8% per year over 14 years.
£53,195
Growth on file: -1.8% per year over 14 years.
Sales timeline
4 October 2018Most recent
£53,195
-21.8%over 13 years18 February 2005
£68,000
Median price across the last 5 sales in CF42 5EB: £80,500 (2024–2021).
Nearby sales in CF42 5EB
3 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
Sold Oct 2024
£95,0009 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
Sold Nov 2023
£72,00010 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
Sold Dec 2022
£142,00020 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
Sold Feb 2022
£80,5006 Glanselsig Street, Blaencwm, Treorchy, CF42 5EB
Sold Oct 2021
£50,000
Everything we know about 17 Glanselsig Street, 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 Glanselsig Street homes
Price per m² for 17 Glanselsig Street lags the street by a wide margin.
Price per m²
£591
Street avg £1,202
Floor Area
90 m²
Street avg 70 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
4.0 t/year
Street avg 4.3 t/year
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The neighbourhood at a glance
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Blaencwm Post Office — bus stop.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.