Energy Performance Certificate
Penthouse B, 15 Portman Square, W1H 6LJ
Energy rating
Current: 52 E | Potential: 77 C
Environmental impact (CO₂)
Current: 39
| Potential: 71
| Field | Value |
|---|---|
| LMK KEY | 2701-1001-8211-1111-1124 |
| ADDRESS1 | Penthouse B |
| ADDRESS2 | 15 Portman Square |
| ADDRESS3 | — |
| POSTCODE | W1H 6LJ |
| BUILDING REFERENCE NUMBER | — |
| CURRENT ENERGY RATING | E |
| POTENTIAL ENERGY RATING | C |
| CURRENT ENERGY EFFICIENCY | 52 |
| POTENTIAL ENERGY EFFICIENCY | 77 |
| PROPERTY TYPE | Maisonette |
| BUILT FORM | End-Terrace |
| INSPECTION DATE | 2025-05-27 |
| LOCAL AUTHORITY | E09000033 |
| CONSTITUENCY | E14001172 |
| COUNTY | — |
| LODGEMENT DATE | 2025-05-27 |
| TRANSACTION TYPE | Marketed sale |
| ENVIRONMENT IMPACT CURRENT | 39 |
| ENVIRONMENT IMPACT POTENTIAL | 71 |
| ENERGY CONSUMPTION CURRENT | 336 |
| ENERGY CONSUMPTION POTENTIAL | 148 |
| CO2 EMISSIONS CURRENT | 14 |
| CO2 EMISS CURR PER FLOOR AREA | 59 |
| CO2 EMISSIONS POTENTIAL | 6 |
| LIGHTING COST CURRENT | 247 |
| LIGHTING COST POTENTIAL | 166 |
| HEATING COST CURRENT | 3266 |
| HEATING COST POTENTIAL | 1364 |
| HOT WATER COST CURRENT | 195 |
| HOT WATER COST POTENTIAL | 195 |
| TOTAL FLOOR AREA | 231 |
| ENERGY TARIFF | Unknown |
| MAINS GAS FLAG | N |
| FLOOR LEVEL | 3 |
| FLAT TOP STOREY | Y |
| FLAT STOREY COUNT | 2 |
| MAIN HEATING CONTROLS | Flat rate charging, no thermostatic control of room temperature |
| MULTI GLAZE PROPORTION | 100 |
| GLAZED TYPE | double glazing, unknown install date |
| GLAZED AREA | More Than Typical |
| EXTENSION COUNT | 1 |
| NUMBER HABITABLE ROOMS | 7 |
| NUMBER HEATED ROOMS | 7 |
| LOW ENERGY LIGHTING | 51 |
| NUMBER OPEN FIREPLACES | 0 |
| HOTWATER DESCRIPTION | Community scheme |
| HOT WATER ENERGY EFF | Good |
| HOT WATER ENV EFF | Good |
| FLOOR DESCRIPTION | (another dwelling below) |
| 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 | Solid brick, as built, no insulation (assumed) |
| WALLS ENERGY EFF | Very Poor |
| WALLS ENV EFF | Very Poor |
| SECONDHEAT DESCRIPTION | None |
| SHEATING ENERGY EFF | N/A |
| SHEATING ENV EFF | N/A |
| ROOF DESCRIPTION | Flat, no insulation (assumed) |
| ROOF ENERGY EFF | Very Poor |
| ROOF ENV EFF | Very Poor |
| MAINHEAT DESCRIPTION | Community scheme |
| MAINHEAT ENERGY EFF | Good |
| MAINHEAT ENV EFF | Good |
| MAINHEATCONT DESCRIPTION | Flat rate charging, no thermostatic control of room temperature |
| MAINHEATC ENERGY EFF | Very Poor |
| MAINHEATC ENV EFF | Very Poor |
| LIGHTING DESCRIPTION | Low energy lighting in 51% of fixed outlets |
| LIGHTING ENERGY EFF | Good |
| LIGHTING ENV EFF | Good |
| MAIN FUEL | mains gas (community) |
| WIND TURBINE COUNT | 0 |
| HEAT LOSS CORRIDOR | heated corridor |
| UNHEATED CORRIDOR LENGTH | 0 |
| FLOOR HEIGHT | 2.42 |
| PHOTO SUPPLY | 0 |
| SOLAR WATER HEATING FLAG | N |
| MECHANICAL VENTILATION | natural |
| ADDRESS | Penthouse B, 15 Portman Square |
| LOCAL AUTHORITY LABEL | Westminster |
| CONSTITUENCY LABEL | Cities of London and Westminster |
| POSTTOWN | LONDON |
| CONSTRUCTION AGE BAND | England and Wales: 1900-1929 |
| LODGEMENT DATETIME | 2025-05-27 20:37:17 |
| TENURE | owner-occupied |
| FIXED LIGHTING OUTLETS COUNT | 43 |
| LOW ENERGY FIXED LIGHT COUNT | 22 |
| UPRN | 200002817623 |
| UPRN SOURCE | Energy Assessor |
| REPORT TYPE | 2 |
| Source file | certificates-2025.csv |
| COUNTRY | England |
| REGION | E12000007 |
| Address display | — |
| Nation | ew |