Energy Performance Certificate
Flat 1a, De Havilland House, Endymion Mews, AL10 0EW
Energy rating
Current: 75 C | Potential: 81 B
Environmental impact (CO₂)
Current: 92
| Potential: 93
| Field | Value |
|---|---|
| LMK KEY | 2813-3343-6141-4041-1966 |
| ADDRESS1 | Flat 1a |
| ADDRESS2 | De Havilland House |
| ADDRESS3 | Endymion Mews |
| POSTCODE | AL10 0EW |
| BUILDING REFERENCE NUMBER | — |
| CURRENT ENERGY RATING | C |
| POTENTIAL ENERGY RATING | B |
| CURRENT ENERGY EFFICIENCY | 75 |
| POTENTIAL ENERGY EFFICIENCY | 81 |
| PROPERTY TYPE | Flat |
| BUILT FORM | Semi-Detached |
| INSPECTION DATE | 2025-09-06 |
| LOCAL AUTHORITY | E07000241 |
| CONSTITUENCY | E14001573 |
| COUNTY | — |
| LODGEMENT DATE | 2025-09-09 |
| TRANSACTION TYPE | Rental |
| ENVIRONMENT IMPACT CURRENT | 92 |
| ENVIRONMENT IMPACT POTENTIAL | 93 |
| ENERGY CONSUMPTION CURRENT | 112 |
| ENERGY CONSUMPTION POTENTIAL | 104 |
| CO2 EMISSIONS CURRENT | 0.6 |
| CO2 EMISS CURR PER FLOOR AREA | 10 |
| CO2 EMISSIONS POTENTIAL | 0.5 |
| LIGHTING COST CURRENT | 48 |
| LIGHTING COST POTENTIAL | 48 |
| HEATING COST CURRENT | 505 |
| HEATING COST POTENTIAL | 357 |
| HOT WATER COST CURRENT | 368 |
| HOT WATER COST POTENTIAL | 320 |
| TOTAL FLOOR AREA | 53 |
| ENERGY TARIFF | dual |
| MAINS GAS FLAG | N |
| FLOOR LEVEL | 1 |
| FLAT TOP STOREY | N |
| FLAT STOREY COUNT | 1 |
| MAIN HEATING CONTROLS | Manual charge control |
| 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 | Electric immersion, off-peak |
| HOT WATER ENERGY EFF | Average |
| HOT WATER ENV EFF | Very Good |
| FLOOR DESCRIPTION | Solid, insulated (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 | Timber frame, as built, insulated (assumed) |
| WALLS ENERGY EFF | Good |
| WALLS ENV EFF | Good |
| SECONDHEAT DESCRIPTION | Room heaters, electric |
| SHEATING ENERGY EFF | N/A |
| SHEATING ENV EFF | N/A |
| ROOF DESCRIPTION | (another dwelling above) |
| ROOF ENERGY EFF | N/A |
| ROOF ENV EFF | N/A |
| MAINHEAT DESCRIPTION | Electric storage heaters, Room heaters, electric |
| MAINHEAT ENERGY EFF | Average |
| MAINHEAT ENV EFF | Very Good |
| MAINHEATCONT DESCRIPTION | Manual charge control |
| MAINHEATC ENERGY EFF | Poor |
| MAINHEATC ENV EFF | Poor |
| LIGHTING DESCRIPTION | Excellent lighting efficiency |
| LIGHTING ENERGY EFF | Very Good |
| LIGHTING ENV EFF | Very Good |
| MAIN FUEL | electricity (not community) |
| WIND TURBINE COUNT | 0 |
| HEAT LOSS CORRIDOR | no corridor |
| UNHEATED CORRIDOR LENGTH | — |
| FLOOR HEIGHT | 2.4 |
| PHOTO SUPPLY | 0 |
| SOLAR WATER HEATING FLAG | N |
| MECHANICAL VENTILATION | natural |
| ADDRESS | Flat 1a, De Havilland House, Endymion Mews |
| LOCAL AUTHORITY LABEL | Welwyn Hatfield |
| CONSTITUENCY LABEL | Welwyn Hatfield |
| POSTTOWN | HATFIELD |
| CONSTRUCTION AGE BAND | England and Wales: 2007-2011 |
| LODGEMENT DATETIME | 2025-09-09 21:09:15 |
| TENURE | rented (private) |
| FIXED LIGHTING OUTLETS COUNT | 17 |
| LOW ENERGY FIXED LIGHT COUNT | 17 |
| UPRN | 10024370615 |
| UPRN SOURCE | Energy Assessor |
| REPORT TYPE | 2 |
| Source file | certificates-2025.csv |
| COUNTRY | England |
| REGION | E12000006 |
| Address display | — |
| Nation | ew |