Energy Performance Certificate
17 Cefn Gwyn, Trawsfynydd, LL41 4SG
Energy rating
Current: 69 C | Potential: 91 B
Environmental impact (CO₂)
Current: 85
| Potential: 92
| Field | Value |
|---|---|
| LMK KEY | 2797-8114-6079-5100-9935 |
| ADDRESS1 | 17 Cefn Gwyn |
| ADDRESS2 | Trawsfynydd |
| ADDRESS3 | — |
| POSTCODE | LL41 4SG |
| BUILDING REFERENCE NUMBER | — |
| CURRENT ENERGY RATING | C |
| POTENTIAL ENERGY RATING | B |
| CURRENT ENERGY EFFICIENCY | 69 |
| POTENTIAL ENERGY EFFICIENCY | 91 |
| PROPERTY TYPE | House |
| BUILT FORM | Semi-Detached |
| INSPECTION DATE | 2026-02-27 |
| LOCAL AUTHORITY | W06000002 |
| CONSTITUENCY | W07000096 |
| COUNTY | — |
| LODGEMENT DATE | 2026-03-02 |
| TRANSACTION TYPE | Grant scheme |
| ENVIRONMENT IMPACT CURRENT | 85 |
| ENVIRONMENT IMPACT POTENTIAL | 92 |
| ENERGY CONSUMPTION CURRENT | 297 |
| ENERGY CONSUMPTION POTENTIAL | 221 |
| CO2 EMISSIONS CURRENT | 1.7 |
| CO2 EMISS CURR PER FLOOR AREA | 25 |
| CO2 EMISSIONS POTENTIAL | 1.2 |
| LIGHTING COST CURRENT | 54 |
| LIGHTING COST POTENTIAL | 54 |
| HEATING COST CURRENT | 1251 |
| HEATING COST POTENTIAL | 1183 |
| HOT WATER COST CURRENT | 686 |
| HOT WATER COST POTENTIAL | 398 |
| TOTAL FLOOR AREA | 69 |
| ENERGY TARIFF | Single |
| MAINS GAS FLAG | N |
| FLOOR LEVEL | — |
| FLAT TOP STOREY | N |
| FLAT STOREY COUNT | 2 |
| MAIN HEATING CONTROLS | TRVs and bypass |
| MULTI GLAZE PROPORTION | 100 |
| GLAZED TYPE | — |
| GLAZED AREA | — |
| EXTENSION COUNT | 0 |
| NUMBER HABITABLE ROOMS | 3 |
| NUMBER HEATED ROOMS | 3 |
| LOW ENERGY LIGHTING | 100 |
| NUMBER OPEN FIREPLACES | 0 |
| HOTWATER DESCRIPTION | From main system, no cylinder thermostat |
| HOT WATER ENERGY EFF | Poor |
| HOT WATER ENV EFF | Good |
| FLOOR DESCRIPTION | Solid, no insulation (assumed) |
| FLOOR ENERGY EFF | N/A |
| FLOOR ENV EFF | N/A |
| WINDOWS DESCRIPTION | Fully double glazed |
| WINDOWS ENERGY EFF | Average |
| WINDOWS ENV EFF | Average |
| WALLS DESCRIPTION | Cavity wall, with external insulation |
| WALLS ENERGY EFF | Good |
| WALLS ENV EFF | Good |
| SECONDHEAT DESCRIPTION | Room heaters, dual fuel (mineral and wood) |
| SHEATING ENERGY EFF | N/A |
| SHEATING ENV EFF | N/A |
| ROOF DESCRIPTION | Pitched, 300 mm loft insulation |
| ROOF ENERGY EFF | Very Good |
| ROOF ENV EFF | Very Good |
| MAINHEAT DESCRIPTION | Boiler, dual fuel (mineral and wood) |
| MAINHEAT ENERGY EFF | Average |
| MAINHEAT ENV EFF | Very Good |
| MAINHEATCONT DESCRIPTION | TRVs and bypass |
| MAINHEATC ENERGY EFF | Average |
| MAINHEATC ENV EFF | Average |
| LIGHTING DESCRIPTION | Good lighting efficiency |
| LIGHTING ENERGY EFF | Good |
| LIGHTING ENV EFF | Good |
| MAIN FUEL | dual fuel - mineral + wood |
| WIND TURBINE COUNT | 0 |
| HEAT LOSS CORRIDOR | — |
| UNHEATED CORRIDOR LENGTH | — |
| FLOOR HEIGHT | 2.31 |
| PHOTO SUPPLY | — |
| SOLAR WATER HEATING FLAG | N |
| MECHANICAL VENTILATION | positive input from loft |
| ADDRESS | 17 Cefn Gwyn, Trawsfynydd |
| LOCAL AUTHORITY LABEL | Gwynedd |
| CONSTITUENCY LABEL | Dwyfor Meirionnydd |
| POSTTOWN | BLAENAU FFESTINIOG |
| CONSTRUCTION AGE BAND | England and Wales: 1950-1966 |
| LODGEMENT DATETIME | 2026-03-02 14:37:08 |
| TENURE | rented (social) |
| FIXED LIGHTING OUTLETS COUNT | 7 |
| LOW ENERGY FIXED LIGHT COUNT | 7 |
| UPRN | 100100025100 |
| UPRN SOURCE | Energy Assessor |
| REPORT TYPE | 2 |
| Source file | certificates-2026.csv |
| COUNTRY | Wales |
| REGION | W99999999 |
| Address display | — |
| Nation | ew |