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 0BU
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 Lane962 m away | 170 m² | 355 m² | +185 m² +109% | 2016 |
| 27, Harmer Green Lane962 m away | 123 m² | 275 m² | +152 m² +124% | 2015 |
| Littlebury, Digswell Lane143 m away | 147 m² | 298 m² | +151 m² +103% | 2011 |
| 42, Hertford Road569 m away | 153 m² | 301 m² | +148 m² +97% | 2013 |
| 4, Honeymead543 m away | 94 m² | 235 m² | +141 m² +150% | 2025 |
| 47, New Road868 m away | 200 m² | 335 m² | +135 m² +68% | 2024 |
| 40, Harmer Green Lane852 m away | 278 m² | 385 m² | +107 m² +38% | 2018 |
| 51, Warren Way975 m away | 92 m² | 198 m² | +106 m² +115% | 2020 |
| 61, Lodge Field817 m away | 79 m² | 171 m² | +92 m² +116% | 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 Grove978 m away | 219 m² | 304 m² | +85 m² +39% | 2015 |
|---|
| 21, Mornington880 m away | 237 m² | 321 m² | +84 m² +35% | 2025 |
|---|
| 113, Warren Way975 m away | 87 m² | 163 m² | +76 m² +87% | 2026 |
|---|
| 44, Harmer Green Lane852 m away | 173 m² | 238 m² | +65 m² +38% | 2024 |
|---|
| Bury Lodge, Digswell Lane143 m away | 106 m² | 163 m² | +57 m² +54% | 2026 |
|---|
| 60, Hertford Road86 m away | 60 m² | 117 m² | +57 m² +95% | 2021 |
|---|
| 10, Warren Way864 m away | 74 m² | 127 m² | +53 m² +72% | 2022 |
|---|
| 11, Harwood Hill954 m away | 65 m² | 115 m² | +50 m² +77% | 2026 |
|---|
| 16, Cubitts Close582 m away | 117 m² | 166 m² | +49 m² +42% | 2024 |
|---|
| 13, Woodside Road775 m away | 88 m² | 137 m² | +49 m² +56% | 2017 |
|---|
| 38, Harmer Green Lane852 m away | 220 m² | 266 m² | +46 m² +21% | 2021 |
|---|
| 50, Warren Way950 m away | 110 m² | 155 m² | +45 m² +41% | 2023 |
|---|
| 151, Harwood Hill748 m away | 86 m² | 130 m² | +44 m² +51% | 2020 |
|---|
| Tsalta, Digswell Lane143 m away | 157 m² | 200 m² | +43 m² +27% | 2014 |
|---|
| 51, Maple Grove876 m away | 72 m² | 109 m² | +37 m² +51% | 2024 |
|---|
| 7, St Ives Close429 m away | 182 m² | 218 m² | +36 m² +20% | 2019 |
|---|
| 11, Warren Way878 m away | 130 m² | 165 m² | +35 m² +27% | 2015 |
|---|
| 1, Byfield723 m away | 79 m² | 113 m² | +34 m² +43% | 2023 |
|---|
| 9, St Ives Close429 m away | 134 m² | 167 m² | +33 m² +25% | 2020 |
|---|
| 1, New Road488 m away | 152 m² | 184 m² | +32 m² +21% | 2026 |
|---|
| 10, Honeymead543 m away | 70 m² | 101 m² | +31 m² +44% | 2009 |
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| 93, Ingles856 m away | 70 m² | 99 m² | +29 m² +41% | 2026 |
|---|
| 29 Bellmont Lodge, Sterling Court, Mundells940 m away | 51 m² | 80 m² | +29 m² +57% | 2026 |
|---|
| 20, Pippens959 m away | 85 m² | 111 m² | +26 m² +31% | 2024 |
|---|
| 21, Flexley Wood450 m away | 59 m² | 84 m² | +25 m² +42% | 2026 |
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| 76, Sloansway690 m away | 87 m² | 112 m² | +25 m² +29% | 2024 |
|---|
| 104, Haymeads771 m away | 37 m² | 62 m² | +25 m² +68% | 2020 |
|---|
| 176, Blythway328 m away | 89 m² | 113 m² | +24 m² +27% | 2022 |
|---|
| 175, Blythway302 m away | 51 m² | 75 m² | +24 m² +47% | 2021 |
|---|
| 149, Blythway302 m away | 87 m² | 110 m² | +23 m² +26% | 2025 |
|---|
| 67, Rowans484 m away | 100 m² | 122 m² | +22 m² +22% | 2013 |
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| 3, Woodside Road775 m away | 62 m² | 83 m² | +21 m² +34% | 2016 |
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| 10, Nutfield551 m away | 86 m² | 105 m² | +19 m² +22% | 2026 |
|---|
| 35, Rowans484 m away | 91 m² | 108 m² | +17 m² +19% | 2019 |
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| 56, Harwood Hill909 m away | 102 m² | 119 m² | +17 m² +17% | 2019 |
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| 81, Warren Way975 m away | 93 m² | 110 m² | +17 m² +18% | 2015 |
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| 12, Nursery Gardens679 m away | 74 m² | 89 m² | +15 m² +20% | 2021 |
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