Gwynedd: house prices and energy ratings
What homes sell for per m², how energy efficient they are, and what extending has added to sale prices, compared with the rest of Wales.
Gwynedd is highlighted on the map. Our planning decision figures cover England only: the Welsh Government publishes planning statistics for Welsh councils. Compare areas on the map
Property prices and energy performance in Gwynedd
Homes sold July 2023 to June 2026, matched to the floor area and energy rating on their Energy Performance Certificate.
Median price per m²
£2,284
3,879 sales
8% below Wales
Homes sold rated EPC A to C
22.5%
Median energy score 59
20.4 points below Wales
Value added by extending, per m²
£1,136
19.3% on the sale price
4% below Wales
Energy upgrade, no extension
+8.8%
Sale-price uplift when the energy score rose 5+ points
1.3 points above Wales
The median home sold in Gwynedd was £194,999 for 87 m² of floor space. Price per m² is up 42% since 2015 (£1,600 to £2,276 per m², 2025). Across all 41,115 homes with a certificate, 28.8% are rated A to C on their latest one.
143 houses here were extended between two sales (second sale 2016 to 2026), adding a median 25 m². They sold for a median 19.3% more than similar unextended houses, £1,136 for each m² added. Will an extension pay for itself here?
Medians from HM Land Registry sale prices and MHCLG Energy Performance Certificates; groups under 30 sales or 50 extended houses are not shown. These describe past sales across many homes, not a valuation of any one. How these are worked out