Spotted when a home's energy certificate shows at least 15 m² (and 15%) more floor area than an earlier one. Only homes with two certificates show up, so the real number is higher. A busy street suggests extensions get permission here; check the council's planning register for the details.
Storm overflows within 2 km
No monitored sewer storm overflows within 2 km (England only).
Panasonic Manufacturing, Pentwyn - BESSBeing built · 1 MW
Jan 2025 3.6 km away
Rooftop solar
University Hospital of Wales - Roof Mounted Solar ArrayApproved, not yet built · 340 kW
Jun 2022 4.1 km away
Battery storage
Gabalfa Interchange - Micro Energy StorageApproved, not yet built · 200 kW
May 2026 4.4 km away
Battery storage
Llanedeyrn Drive - Micro Energy Storage ProjectApproved, not yet built · 200 kW
May 2026 4.7 km away
Rooftop solar
David Lloyd Leisure Club, Ipswich Road - Solar ArrayApproved, not yet built · 370 kW
Feb 2024 5.8 km away
Battery storage
Ipswich Road, Cardiff - Battery StorageApproved, not yet built · 93 MW
Apr 2024 5.9 km away
Rooftop solar
Cardiff University - Solar PanelsApproved, not yet built · 190 kW
Aug 2024 6.0 km away
Solar farm
Road and street works within 1 km
No road or street works with a permit running now or planned within 1 km (England; permits granted up to the end of September 2026).
DfT Street Manager permits (OGL), England. Dates are the planned ones; works often finish early or overrun.
Major infrastructure projects within 30 km
Pre-application
Future Energy Llanwern Solar ProjectGenerating Stations · Land to the south of Llanwern Steelworks (approx. 2.5km) comprising the Gwent Levels between Whitson
application due November 2026 23.8 km away
Planning Inspectorate list of nationally significant infrastructure projects (roads, railways, energy, water, waste), October 2026 (OGL). Each is placed at one point, usually the middle of the site; long schemes run well beyond it.
Transport schemes within 20 km
None on our list yet. We're starting with recently opened and under-construction rail schemes.
The longer view
Like-for-like prices in Thornhill: +29% over five years (2020 → 2025).
Council tax list: 0 homes added in the neighbourhood since April 2024.