15 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
About 15 Ty Gwyn Gardens
15 Ty Gwyn Gardens is a detached house in Penylan, Cardiff, Cardiff (CF23 5BF). It has a recorded floor area of 247 m² (around 2659 sq ft) and construction records dating it to 2012 onwards. The latest certificate (September 2024) shows a C (score 78), near the top of the C band. Earlier certificates rated it B (August 2013); the latest reading is one band lower. Between certificates, roof efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. The recommended improvements would push it to B (score 82).
On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2014–2024, sale prices on this property compounded at 3% per year. On a £-per-square-foot basis, the last sale (£335/sq ft) was about 25.8% above the typical sold price in the postcode. Sold September 2024 for £890,000.
Energy performance
15 Ty Gwyn Gardens sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Rating
Get a survey for this property
Level 3 Building Survey
Because the property has been extended more than once, we believe a Level 3 building survey should be considered.
From £1,495 · Includes VAT
Planning history
15 Ty Gwyn Gardens has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
£923,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.0% per year over 10 years.
£890,000
Growth on file: 3.0% per year over 10 years.
Sales timeline
15 September 2024Most recent
£890,000
+34.8%over 10 years10 July 2014
£659,995
Median price across the last 5 sales in CF23 5BF: £808,000 (2022–2014).
Nearby sales in CF23 5BF
21 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
Sold May 2022
£950,00020 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
Sold Sept 2018
£808,00016 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
Sold Oct 2017
£690,00011 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
Sold Mar 2016
£840,0002 Ty Gwyn Gardens, Penylan, Cardiff, CF23 5BF
Sold Nov 2014
£559,995
Versus other Ty Gwyn Gardens homes
Price per m² for 15 Ty Gwyn Gardens runs comfortably ahead of the street norm.
Price per m²
£3,603
Street avg £2,912
Floor Area
247 m²
Street avg 220 m²
CO₂ Emissions
4.7 t/year
Street avg 2.8 t/year
Years Held
2 years
Street avg 11 years
Similar properties nearby
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
9/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Ty Gwyn School — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







