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 SA8 3AU
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 |
|---|---|---|---|---|
| 13, Cae Is Maen877 m away | 123 m² | 246 m² | +123 m² +100% | 2020 |
| 50, Derwen Road0 m away | 45 m² | 104 m² | +59 m² +131% | 2011 |
| Mountain View, Alltwen Hill651 m away | 123 m² | 165 m² | +42 m² +34% | 2022 |
| 21, Dyffryn Road778 m away | 78 m² | 120 m² | +42 m² +54% | 2019 |
| 16, Orchard Street936 m away | 145 m² | 180 m² | +35 m² +24% | 2017 |
| 85, Alltwen Hill676 m away | 85 m² | 118 m² | +33 m² +39% | 2024 |
| 27, Derwen Road0 m away | 98 m² | 126 m² | +28 m² +29% | 2025 |
| 69, Swansea Road556 m away | 77 m² | 101 m² | +24 m² +31% | 2023 |
| 63, Swansea Road556 m away | 72 m² | 96 m² | +24 m² +33% | 2022 |
| 24, Swansea Road556 m away | 97 m² | 119 m² | +22 m² +23% | 2023 |
| 75, Alltwen Hill676 m away | 87 m² | 109 m² | +22 m² +25% | 2016 |
| 12, Gwyns Place495 m away | 66 m² | 88 m² | +22 m² +33% | 2013 |
| 35, Alltwen Hill651 m away | 108 m² | 129 m² | +21 m² +19% | 2024 |
| 65, Gwyn Street138 m away | 91 m² | 109 m² | +18 m² +20% | 2026 |
| 6, Mill Row712 m away | 65 m² | 82 m² | +17 m² +26% | 2022 |
| 18, High Street974 m away | 23 m² | 40 m² | +17 m² +74% | 2022 |
| 14, Glynmeirch Road779 m away | 92 m² | 109 m² | +17 m² +18% | 2018 |
| 148, Tyn Y Cae345 m away | 70 m² | 85 m² | +15 m² +21% | 2026 |
| 43, Alltwen Hill651 m away | 62 m² | 77 m² | +15 m² +24% | 2024 |
| 2, Derwen Road0 m away | 85 m² | 100 m² | +15 m² +18% | 2022 |
| 5, High Street732 m away | 71 m² | 86 m² | +15 m² +21% | 2021 |
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.