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 AL6 0DB
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 |
|---|---|---|---|---|
| 35, Harmer Green Lane685 m away | 170 m² | 355 m² | +185 m² +109% | 2016 |
| 27, Harmer Green Lane685 m away | 123 m² | 275 m² | +152 m² +124% | 2015 |
| Littlebury, Digswell Lane488 m away | 147 m² | 298 m² | +151 m² +103% | 2011 |
| 42, Hertford Road0 m away | 153 m² | 301 m² | +148 m² +97% | 2013 |
| 2, Sharmans Close905 m away | 128 m² | 271 m² | +143 m² +112% | 2010 |
| 4, Honeymead253 m away | 94 m² | 235 m² | +141 m² +150% | 2025 |
| 47, New Road698 m away | 200 m² | 335 m² | +135 m² +68% | 2024 |
| 40, Harmer Green Lane585 m away | 278 m² | 385 m² | +107 m² +38% | 2018 |
| 51, Warren Way579 m away | 92 m² | 198 m² | +106 m² +115% | 2020 |
| 4, Stonemead |
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.
| 175 m² |
| 263 m² |
| +88 m² +50% |
| 2025 |
| 15, Fern Grove551 m away | 219 m² | 304 m² | +85 m² +39% | 2015 |
|---|
| 21, Mornington862 m away | 237 m² | 321 m² | +84 m² +35% | 2025 |
|---|
| 113, Warren Way579 m away | 87 m² | 163 m² | +76 m² +87% | 2026 |
|---|
| 37, Digswell Park Road638 m away | 106 m² | 178 m² | +72 m² +68% | 2024 |
|---|
| 44, Harmer Green Lane585 m away | 173 m² | 238 m² | +65 m² +38% | 2024 |
|---|
| Bury Lodge, Digswell Lane488 m away | 106 m² | 163 m² | +57 m² +54% | 2026 |
|---|
| 336, Knightsfield995 m away | 121 m² | 178 m² | +57 m² +47% | 2022 |
|---|
| 60, Hertford Road504 m away | 60 m² | 117 m² | +57 m² +95% | 2021 |
|---|
| 10, Warren Way350 m away | 74 m² | 127 m² | +53 m² +72% | 2022 |
|---|
| 16, Cubitts Close148 m away | 117 m² | 166 m² | +49 m² +42% | 2024 |
|---|
| 13, Woodside Road307 m away | 88 m² | 137 m² | +49 m² +56% | 2017 |
|---|
| 279, Knightsfield949 m away | 104 m² | 152 m² | +48 m² +46% | 2016 |
|---|
| 38, Harmer Green Lane585 m away | 220 m² | 266 m² | +46 m² +21% | 2021 |
|---|
| 50, Warren Way530 m away | 110 m² | 155 m² | +45 m² +41% | 2023 |
|---|
| 151, Harwood Hill660 m away | 86 m² | 130 m² | +44 m² +51% | 2020 |
|---|
| Tsalta, Digswell Lane488 m away | 157 m² | 200 m² | +43 m² +27% | 2014 |
|---|
| 7, St Ives Close205 m away | 182 m² | 218 m² | +36 m² +20% | 2019 |
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| 11, Warren Way342 m away | 130 m² | 165 m² | +35 m² +27% | 2015 |
|---|
| 1, Byfield796 m away | 79 m² | 113 m² | +34 m² +43% | 2023 |
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| 7, Willow Grove710 m away | 103 m² | 136 m² | +33 m² +32% | 2025 |
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| 9, St Ives Close205 m away | 134 m² | 167 m² | +33 m² +25% | 2020 |
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| 1, New Road306 m away | 152 m² | 184 m² | +32 m² +21% | 2026 |
|---|
| 10, Honeymead253 m away | 70 m² | 101 m² | +31 m² +44% | 2009 |
|---|
| 93, Ingles639 m away | 70 m² | 99 m² | +29 m² +41% | 2026 |
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| 332, Knightsfield995 m away | 124 m² | 152 m² | +28 m² +23% | 2024 |
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| 20, Pippens986 m away | 85 m² | 111 m² | +26 m² +31% | 2024 |
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| 21, Flexley Wood976 m away | 59 m² | 84 m² | +25 m² +42% | 2026 |
|---|
| 371, Knightsfield732 m away | 88 m² | 113 m² | +25 m² +28% | 2024 |
|---|
| 104, Haymeads755 m away | 37 m² | 62 m² | +25 m² +68% | 2020 |
|---|
| 70, Digswell Park Road550 m away | 133 m² | 158 m² | +25 m² +19% | 2018 |
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| 176, Blythway786 m away | 89 m² | 113 m² | +24 m² +27% | 2022 |
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| 175, Blythway775 m away | 51 m² | 75 m² | +24 m² +47% | 2021 |
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| 149, Blythway775 m away | 87 m² | 110 m² | +23 m² +26% | 2025 |
|---|
| 3, Woodside Road307 m away | 62 m² | 83 m² | +21 m² +34% | 2016 |
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| 12, Willow Grove710 m away | 111 m² | 132 m² | +21 m² +19% | 2016 |
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| 56, Harwood Hill980 m away | 102 m² | 119 m² | +17 m² +17% | 2019 |
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| 81, Warren Way579 m away | 93 m² | 110 m² | +17 m² +18% | 2015 |
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| 12, Nursery Gardens906 m away | 74 m² | 89 m² | +15 m² +20% | 2021 |
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