Finding extended homes…
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Homes within 1 km whose energy certificates show the floor area growing: extensions, loft and garage conversions. Tap a home on the map or in the list for its full history. Back to HP4 1TP
Not every extension shows here. We only see building work when a new energy certificate is lodged, which happens when a home is sold, let or newly built. A loft or extension added since then won't appear, even with planning permission and building control sign-off, because those records aren't published as open data outside London. Missing work doesn't mean missing paperwork.
| Home | Before | After | Added | Recorded |
|---|---|---|---|---|
| Northchurch House, New Road365 m away | 287 m² | 398 m² | +111 m² +39% | 2019 |
| Highways, Northchurch Common418 m away | 163 m² | 273 m² | +110 m² +67% | 2017 |
| 5, The Meads482 m away | 78 m² | 178 m² | +100 m² +128% | 2022 |
| 7, Dell Road913 m away | 143 m² | 242 m² | +99 m² +69% | 2015 |
| 5, Dell Road913 m away | 120 m² | 215 m² | +95 m² +79% | 2025 |
| 51, Covert Road815 m away | 86 m² | 181 m² | +95 m² +110% | 2015 |
| 2, Bulbourne Close653 m away | 80 m² | 170 m² | +90 m² +113% | 2026 |
| Rosemount, Northchurch Common418 m away | 201 m² | 290 m² | +89 m² +44% | 2017 |
| Ivy Todd, Northchurch Common418 m away |
From energy performance certificates (MHCLG): a later certificate shows at least 15 m² and 15% more floor area than an earlier one (and no more than 2.5 times, to leave out typing errors). Some changes come from a more careful measurement rather than building work. Addresses: HM Land Registry. Contains HM Land Registry data © Crown copyright and database right 2026, OGL v3.0.
| 129 m² |
| 218 m² |
| +89 m² +69% |
| 2016 |
| 26, Covert Road815 m away | 63 m² | 148 m² | +85 m² +135% | 2025 |
|---|
| 1, Southbank Road287 m away | 71 m² | 152 m² | +81 m² +114% | 2019 |
|---|
| The Coach House, New Road365 m away | 147 m² | 228 m² | +81 m² +55% | 2018 |
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| 17, Granville Road743 m away | 63 m² | 142 m² | +79 m² +125% | 2022 |
|---|
| 4, Montgomerie Close381 m away | 63 m² | 138 m² | +75 m² +119% | 2015 |
|---|
| 6, Haynes Mead433 m away | 112 m² | 185 m² | +73 m² +65% | 2026 |
|---|
| 31, Chaucer Close817 m away | 80 m² | 152 m² | +72 m² +90% | 2015 |
|---|
| 5, Darrs Lane662 m away | 66 m² | 136 m² | +70 m² +106% | 2016 |
|---|
| 159, High Street South707 m away | 121 m² | 189 m² | +68 m² +56% | 2021 |
|---|
| 23, Edlyn Close908 m away | 62 m² | 129 m² | +67 m² +108% | 2015 |
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| 20, Bridle Way550 m away | 109 m² | 173 m² | +64 m² +59% | 2025 |
|---|
| 11, Bridgewater Hill46 m away | 115 m² | 178 m² | +63 m² +55% | 2026 |
|---|
| 28, Coombe Gardens800 m away | 80 m² | 143 m² | +63 m² +79% | 2023 |
|---|
| 2, Durrants Lane729 m away | 173 m² | 236 m² | +63 m² +36% | 2020 |
|---|
| Bracken Hurst, Northchurch Common418 m away | 77 m² | 136 m² | +59 m² +77% | 2015 |
|---|
| 5, Meadow Road777 m away | 99 m² | 155 m² | +56 m² +57% | 2024 |
|---|
| 40, Valley Road470 m away | 78 m² | 132 m² | +54 m² +69% | 2025 |
|---|
| 30, Valley Road564 m away | 81 m² | 135 m² | +54 m² +67% | 2020 |
|---|
| 80, Westfield Road699 m away | 67 m² | 120 m² | +53 m² +79% | 2024 |
|---|
| 11, Admiral Way228 m away | 95 m² | 146 m² | +51 m² +54% | 2023 |
|---|
| 14, Dukes Way887 m away | 72 m² | 123 m² | +51 m² +71% | 2015 |
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| 9, Park Rise683 m away | 86 m² | 135 m² | +49 m² +57% | 2017 |
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| 156, Bridgewater Road811 m away | 67 m² | 115 m² | +48 m² +72% | 2023 |
|---|
| 1a, Dell Road913 m away | 125 m² | 172 m² | +47 m² +38% | 2025 |
|---|
| 24, Lochnell Road553 m away | 72 m² | 119 m² | +47 m² +65% | 2024 |
|---|
| 6, Careys Croft244 m away | 97 m² | 144 m² | +47 m² +48% | 2019 |
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| 136, Bridgewater Road811 m away | 67 m² | 113 m² | +46 m² +69% | 2020 |
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| 55, Westfield Road699 m away | 61 m² | 107 m² | +46 m² +75% | 2019 |
|---|
| 7, Peacocks Close160 m away | 61 m² | 106 m² | +45 m² +74% | 2025 |
|---|
| 1, Nash Close992 m away | 77 m² | 121 m² | +44 m² +57% | 2021 |
|---|
| 16, Hill View312 m away | 79 m² | 123 m² | +44 m² +56% | 2020 |
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| 144, Bridgewater Road811 m away | 75 m² | 119 m² | +44 m² +59% | 2015 |
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| 53, Granville Road743 m away | 61 m² | 104 m² | +43 m² +70% | 2023 |
|---|
| 12, Normandy Drive990 m away | 75 m² | 118 m² | +43 m² +57% | 2019 |
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| 123, Bridgewater Road801 m away | 77 m² | 120 m² | +43 m² +56% | 2018 |
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| 114, Bridgewater Road980 m away | 68 m² | 111 m² | +43 m² +63% | 2017 |
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| 43, Loxley Road626 m away | 83 m² | 126 m² | +43 m² +52% | 2016 |
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| 32, St Marys Avenue834 m away | 68 m² | 111 m² | +43 m² +63% | 2015 |
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| 7, Bourne Road952 m away | 96 m² | 139 m² | +43 m² +45% | 2015 |
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| 10, St Marys Avenue834 m away | 56 m² | 99 m² | +43 m² +77% | 2013 |
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| 5, Northchurch Place, 49, High Street545 m away | 29 m² | 70 m² | +41 m² +141% | 2023 |
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| 29, Loxley Road626 m away | 66 m² | 106 m² | +40 m² +61% | 2026 |
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| 25, Lochnell Road553 m away | 85 m² | 125 m² | +40 m² +47% | 2023 |
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| 52, Billet Lane688 m away | 90 m² | 130 m² | +40 m² +44% | 2019 |
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| 1, Dukes Way887 m away | 86 m² | 126 m² | +40 m² +47% | 2015 |
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| 1, Swallowtail Walk0 m away | 88 m² | 127 m² | +39 m² +44% | 2020 |
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| 7, Granville Road753 m away | 75 m² | 113 m² | +38 m² +51% | 2026 |
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| 26, Seymour Road653 m away | 92 m² | 130 m² | +38 m² +41% | 2022 |
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| 31, St Marys Avenue834 m away | 70 m² | 108 m² | +38 m² +54% | 2020 |
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| 4, Lochnell Road553 m away | 86 m² | 123 m² | +37 m² +43% | 2024 |
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| 13, Tring Road931 m away | 112 m² | 149 m² | +37 m² +33% | 2023 |
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| 37, Egerton Road942 m away | 104 m² | 139 m² | +35 m² +34% | 2020 |
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| 42, Meadow Road968 m away | 81 m² | 116 m² | +35 m² +43% | 2019 |
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| 34, Chiltern Park Avenue659 m away | 37 m² | 72 m² | +35 m² +95% | 2014 |
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| 38, Meadow Road968 m away | 79 m² | 113 m² | +34 m² +43% | 2017 |
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| 2, Normandy Drive990 m away | 98 m² | 132 m² | +34 m² +35% | 2016 |
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| 138, Bridgewater Road811 m away | 76 m² | 110 m² | +34 m² +45% | 2015 |
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| 1, Bridgewater Hill46 m away | 120 m² | 153 m² | +33 m² +28% | 2026 |
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| 26, Connaught Gardens124 m away | 104 m² | 137 m² | +33 m² +32% | 2022 |
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| 31, Durrants Road836 m away | 82 m² | 114 m² | +32 m² +39% | 2023 |
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| 38, Chiltern Park Avenue659 m away | 75 m² | 107 m² | +32 m² +43% | 2015 |
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| 14, Egerton Road784 m away | 133 m² | 164 m² | +31 m² +23% | 2020 |
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| 4, St Marys Avenue834 m away | 71 m² | 101 m² | +30 m² +42% | 2026 |
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| 10, Egerton Road784 m away | 98 m² | 128 m² | +30 m² +31% | 2020 |
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| 14, Dell Field Avenue880 m away | 104 m² | 134 m² | +30 m² +29% | 2020 |
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| 57, Chiltern Park Avenue659 m away | 54 m² | 84 m² | +30 m² +56% | 2015 |
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| 3, Egerton Road784 m away | 114 m² | 144 m² | +30 m² +26% | 2015 |
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| 9, St Katherines Way259 m away | 85 m² | 115 m² | +30 m² +35% | 2014 |
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| 63, Granville Road743 m away | 166 m² | 195 m² | +29 m² +17% | 2023 |
|---|
| 20, Mortain Drive252 m away | 93 m² | 121 m² | +28 m² +30% | 2025 |
|---|
| 3, Northchurch Place, 49, High Street545 m away | 26 m² | 54 m² | +28 m² +108% | 2023 |
|---|
| 28, Merling Croft540 m away | 59 m² | 86 m² | +27 m² +46% | 2026 |
|---|
| 2, Cowslip Meadow79 m away | 108 m² | 135 m² | +27 m² +25% | 2022 |
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| 35, Egerton Road942 m away | 133 m² | 160 m² | +27 m² +20% | 2022 |
|---|
| 17, Merling Croft540 m away | 67 m² | 94 m² | +27 m² +40% | 2018 |
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| 6, Brimstone Walk364 m away | 116 m² | 142 m² | +26 m² +22% | 2024 |
|---|
| 3, Coombe Gardens800 m away | 161 m² | 187 m² | +26 m² +16% | 2014 |
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| 73, Covert Road995 m away | 93 m² | 118 m² | +25 m² +27% | 2020 |
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| 10, Normandy Drive990 m away | 76 m² | 101 m² | +25 m² +33% | 2018 |
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| Romney, Seymour Road653 m away | 96 m² | 120 m² | +24 m² +25% | 2022 |
|---|
| 27, Admiral Way228 m away | 61 m² | 85 m² | +24 m² +39% | 2014 |
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| 126, Bridgewater Road980 m away | 83 m² | 106 m² | +23 m² +28% | 2013 |
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| 31, Covert Road815 m away | 107 m² | 130 m² | +23 m² +21% | 2012 |
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| 14, Duncombe Road578 m away | 59 m² | 81 m² | +22 m² +37% | 2021 |
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| 62, Billet Lane688 m away | 69 m² | 91 m² | +22 m² +32% | 2017 |
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| 7, Haynes Mead433 m away | 103 m² | 124 m² | +21 m² +20% | 2025 |
|---|
| 3, Alma Road609 m away | 92 m² | 113 m² | +21 m² +23% | 2013 |
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| 4, Dell Field Avenue904 m away | 76 m² | 97 m² | +21 m² +28% | 2013 |
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| 4, Valley Road564 m away | 103 m² | 124 m² | +21 m² +20% | 2011 |
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| 6, Dell Field Avenue904 m away | 96 m² | 116 m² | +20 m² +21% | 2025 |
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| 18, Turner Court, High Street759 m away | 62 m² | 82 m² | +20 m² +32% | 2019 |
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| 6, Emerton Court393 m away | 56 m² | 76 m² | +20 m² +36% | 2015 |
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| 110, High Street474 m away | 126 m² | 145 m² | +19 m² +15% | 2025 |
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| 4, Tortoiseshell Way274 m away | 83 m² | 102 m² | +19 m² +23% | 2016 |
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| 7, Duncombe Road578 m away | 69 m² | 87 m² | +18 m² +26% | 2023 |
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| 74, Gossoms End979 m away | 48 m² | 66 m² | +18 m² +38% | 2022 |
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| 13, Dell Field Close652 m away | 91 m² | 109 m² | +18 m² +20% | 2016 |
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| 6, St Marys Avenue834 m away | 57 m² | 75 m² | +18 m² +32% | 2010 |
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| 8, Connaught Gardens124 m away | 76 m² | 93 m² | +17 m² +22% | 2025 |
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| 30, Meadow Road802 m away | 101 m² | 118 m² | +17 m² +17% | 2025 |
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| Flat 3, 97, High Street535 m away | 59 m² | 76 m² | +17 m² +29% | 2019 |
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| 113, Bridgewater Road801 m away | 77 m² | 94 m² | +17 m² +22% | 2019 |
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| 134, Chiltern Park Avenue462 m away | 34 m² | 50 m² | +16 m² +47% | 2025 |
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| 2, Beckets Square599 m away | 88 m² | 104 m² | +16 m² +18% | 2024 |
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| 17, Edlyn Close908 m away | 61 m² | 77 m² | +16 m² +26% | 2024 |
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| 20, Merling Croft540 m away | 69 m² | 85 m² | +16 m² +23% | 2022 |
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| 28, Admiral Way228 m away | 75 m² | 91 m² | +16 m² +21% | 2018 |
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| 65, Gossoms End979 m away | 73 m² | 88 m² | +15 m² +21% | 2024 |
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| 1, Hill View312 m away | 60 m² | 75 m² | +15 m² +25% | 2021 |
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| 29, Westfield Road727 m away | 85 m² | 100 m² | +15 m² +18% | 2020 |
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| 11, St Marys Avenue834 m away | 56 m² | 71 m² | +15 m² +27% | 2014 |
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