Finding extended homes…
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Sign in to keep them on every device →Finding extended homes…
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 CF11 9PR
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 |
|---|---|---|---|---|
| 173, Cathedral Road468 m away | 166 m² | 342 m² | +176 m² +106% | 2016 |
| 93, Cathedral Road772 m away | 116 m² | 280 m² | +164 m² +141% | 2023 |
| 29, Romilly Road West659 m away | 125 m² | 278 m² | +153 m² +122% | 2016 |
| 121, Pencisely Road877 m away | 167 m² | 287 m² | +120 m² +72% | 2024 |
| 2a, William Street225 m away | 72 m² | 179 m² | +107 m² +149% | 2022 |
| 184, Lansdowne Road985 m away | 109 m² | 212 m² | +103 m² +94% | 2026 |
| 23, Pontcanna Place176 m away | 78 m² | 175 m² | +97 m² +124% | 2025 |
| 9, St Michaels Road887 m away | 147 m² | 237 m² | +90 m² +61% | 2025 |
| 47, Talbot Street948 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.
| 155 m² |
| 239 m² |
| +84 m² +54% |
| 2018 |
| 21, Brunswick Street825 m away | 97 m² | 181 m² | +84 m² +87% | 2014 |
|---|
| 5, Dyfrig Street640 m away | 64 m² | 134 m² | +70 m² +109% | 2008 |
|---|
| 12, Kyveilog Street574 m away | 76 m² | 142 m² | +66 m² +87% | 2019 |
|---|
| 122, Severn Grove239 m away | 128 m² | 193 m² | +65 m² +51% | 2015 |
|---|
| 23, Teilo Street396 m away | 82 m² | 147 m² | +65 m² +79% | 2015 |
|---|
| Cwrt Soffia, 47 - 53, Cathedral Road915 m away | 66 m² | 128 m² | +62 m² +94% | 2008 |
|---|
| 78, Plasturton Avenue434 m away | 74 m² | 135 m² | +61 m² +82% | 2024 |
|---|
| 12, Westbury Terrace702 m away | 51 m² | 110 m² | +59 m² +116% | 2025 |
|---|
| 6, Chargot Road852 m away | 169 m² | 228 m² | +59 m² +35% | 2024 |
|---|
| 22, Surrey Street999 m away | 42 m² | 99 m² | +57 m² +136% | 2015 |
|---|
| 14, St Johns Crescent926 m away | 121 m² | 178 m² | +57 m² +47% | 2012 |
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| 14, St Michaels Road914 m away | 155 m² | 211 m² | +56 m² +36% | 2015 |
|---|
| 23, York Street905 m away | 74 m² | 128 m² | +54 m² +73% | 2024 |
|---|
| 3, Carmarthen Street532 m away | 79 m² | 132 m² | +53 m² +67% | 2014 |
|---|
| 33, Penhill Road0 m away | 84 m² | 137 m² | +53 m² +63% | 2009 |
|---|
| 127, Llandaff Road393 m away | 122 m² | 172 m² | +50 m² +41% | 2024 |
|---|
| 23, Cae Syr Dafydd239 m away | 70 m² | 120 m² | +50 m² +71% | 2014 |
|---|
| 60, Cathedral Road884 m away | 43 m² | 93 m² | +50 m² +116% | 2013 |
|---|
| 34, St Michaels Road914 m away | 157 m² | 206 m² | +49 m² +31% | 2024 |
|---|
| 7, Ryder Street887 m away | 160 m² | 208 m² | +48 m² +30% | 2023 |
|---|
| 1, Berthwin Street537 m away | 61 m² | 109 m² | +48 m² +79% | 2021 |
|---|
| 19, Gileston Road339 m away | 125 m² | 173 m² | +48 m² +38% | 2019 |
|---|
| 33, Teilo Street396 m away | 156 m² | 202 m² | +46 m² +29% | 2026 |
|---|
| 7, Wembley Road908 m away | 70 m² | 115 m² | +45 m² +64% | 2015 |
|---|
| 14, Pencisely Rise897 m away | 121 m² | 165 m² | +44 m² +36% | 2026 |
|---|
| 13, Forrest Road811 m away | 123 m² | 167 m² | +44 m² +36% | 2020 |
|---|
| 33, Ovington Terrace662 m away | 143 m² | 187 m² | +44 m² +31% | 2019 |
|---|
| 481, Cowbridge Road East873 m away | 55 m² | 99 m² | +44 m² +80% | 2012 |
|---|
| Flat 4, 78, Cathedral Road767 m away | 75 m² | 118 m² | +43 m² +57% | 2023 |
|---|
| 18, Egerton Street624 m away | 75 m² | 118 m² | +43 m² +57% | 2020 |
|---|
| 76, Wyndham Crescent741 m away | 182 m² | 225 m² | +43 m² +24% | 2016 |
|---|
| 42, Plasturton Gardens737 m away | 212 m² | 254 m² | +42 m² +20% | 2025 |
|---|
| 76, Cathedral Road767 m away | 41 m² | 83 m² | +42 m² +102% | 2022 |
|---|
| 133, Clive Road536 m away | 47 m² | 88 m² | +41 m² +87% | 2021 |
|---|
| 28, Palace Road808 m away | 233 m² | 274 m² | +41 m² +18% | 2020 |
|---|
| 5, Egerton Street649 m away | 101 m² | 142 m² | +41 m² +41% | 2011 |
|---|
| 47, Conybeare Road658 m away | 122 m² | 162 m² | +40 m² +33% | 2021 |
|---|
| 21, Wyndham Road730 m away | 91 m² | 130 m² | +39 m² +43% | 2026 |
|---|
| 100, Severn Grove239 m away | 141 m² | 180 m² | +39 m² +28% | 2025 |
|---|
| The Croft, Llandaff Road136 m away | 220 m² | 259 m² | +39 m² +18% | 2021 |
|---|
| 20, Victoria Park Road East982 m away | 108 m² | 146 m² | +38 m² +35% | 2017 |
|---|
| 67, Fairleigh Road335 m away | 95 m² | 132 m² | +37 m² +39% | 2023 |
|---|
| 15, Fields Park Road223 m away | 172 m² | 209 m² | +37 m² +22% | 2022 |
|---|
| 31, Daisy Street704 m away | 66 m² | 102 m² | +36 m² +55% | 2024 |
|---|
| 39, Market Road591 m away | 94 m² | 130 m² | +36 m² +38% | 2022 |
|---|
| 25, Halsbury Road752 m away | 93 m² | 129 m² | +36 m² +39% | 2015 |
|---|
| 75, Romilly Crescent373 m away | 150 m² | 186 m² | +36 m² +24% | 2014 |
|---|
| 201, Cathedral Road392 m away | 61 m² | 97 m² | +36 m² +59% | 2014 |
|---|
| 1, Tintern Street807 m away | 66 m² | 102 m² | +36 m² +55% | 2012 |
|---|
| Flat 2, 38, Glamorgan Street620 m away | 43 m² | 79 m² | +36 m² +84% | 2010 |
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| 112, Pembroke Road535 m away | 89 m² | 124 m² | +35 m² +39% | 2024 |
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| 15, Greenwich Road773 m away | 82 m² | 117 m² | +35 m² +43% | 2022 |
|---|
| 23, Chargot Road852 m away | 179 m² | 214 m² | +35 m² +20% | 2022 |
|---|
| 136b, Llandaff Road215 m away | 104 m² | 139 m² | +35 m² +34% | 2019 |
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| 190, Cathedral Road396 m away | 53 m² | 88 m² | +35 m² +66% | 2010 |
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| 13, Fairleigh Road274 m away | 118 m² | 152 m² | +34 m² +29% | 2025 |
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| 63, Clive Road638 m away | 34 m² | 68 m² | +34 m² +100% | 2022 |
|---|
| 37, Severn Grove336 m away | 48 m² | 82 m² | +34 m² +71% | 2021 |
|---|
| 29, Plasturton Gardens728 m away | 141 m² | 175 m² | +34 m² +24% | 2021 |
|---|
| 123, Clive Road583 m away | 113 m² | 147 m² | +34 m² +30% | 2013 |
|---|
| 16, Westbury Terrace702 m away | 72 m² | 105 m² | +33 m² +46% | 2026 |
|---|
| 3, St Michaels Road887 m away | 184 m² | 217 m² | +33 m² +18% | 2026 |
|---|
| 67, Plasturton Avenue438 m away | 171 m² | 204 m² | +33 m² +19% | 2023 |
|---|
| 97, Kings Road763 m away | 149 m² | 182 m² | +33 m² +22% | 2021 |
|---|
| 1a, Teilo Street396 m away | 144 m² | 177 m² | +33 m² +23% | 2020 |
|---|
| 324, Cowbridge Road East804 m away | 37 m² | 70 m² | +33 m² +89% | 2018 |
|---|
| 68, Cathedral Road884 m away | 42 m² | 75 m² | +33 m² +79% | 2016 |
|---|
| 29, Rectory Road424 m away | 46 m² | 79 m² | +33 m² +72% | 2012 |
|---|
| 108, Wyndham Road618 m away | 93 m² | 126 m² | +33 m² +35% | 2011 |
|---|
| 98, Clive Road536 m away | 140 m² | 173 m² | +33 m² +24% | 2010 |
|---|
| 290, Cowbridge Road East747 m away | 46 m² | 79 m² | +33 m² +72% | 2009 |
|---|
| 292, Cowbridge Road East747 m away | 46 m² | 79 m² | +33 m² +72% | 2009 |
|---|
| 12, Preswylfa Street500 m away | 93 m² | 125 m² | +32 m² +34% | 2026 |
|---|
| 29, Wembley Road908 m away | 92 m² | 124 m² | +32 m² +35% | 2025 |
|---|
| Flat 1, Kings Mews, Kings Road982 m away | 35 m² | 67 m² | +32 m² +91% | 2025 |
|---|
| 10, Vishwell Road586 m away | 97 m² | 129 m² | +32 m² +33% | 2021 |
|---|
| Flat 4, 86, Cathedral Road767 m away | 55 m² | 87 m² | +32 m² +58% | 2021 |
|---|
| 119, Cathedral Road665 m away | 53 m² | 85 m² | +32 m² +60% | 2020 |
|---|
| 13, Victoria Park Road East982 m away | 51 m² | 83 m² | +32 m² +63% | 2020 |
|---|
| 35, Pen Y Peel Road582 m away | 82 m² | 113 m² | +31 m² +38% | 2023 |
|---|
| 92, Wyndham Crescent741 m away | 57 m² | 88 m² | +31 m² +54% | 2013 |
|---|
| 29, Pontcanna Street402 m away | 122 m² | 152 m² | +30 m² +25% | 2020 |
|---|
| 1, Penhill Road146 m away | 58 m² | 88 m² | +30 m² +52% | 2019 |
|---|
| 106, Clive Road536 m away | 129 m² | 159 m² | +30 m² +23% | 2019 |
|---|
| 41, Kings Road871 m away | 61 m² | 91 m² | +30 m² +49% | 2017 |
|---|
| 26, Romilly Road550 m away | 57 m² | 87 m² | +30 m² +53% | 2010 |
|---|
| 9, Wyndham Road730 m away | 91 m² | 120 m² | +29 m² +32% | 2025 |
|---|
| 3, Egham Street501 m away | 99 m² | 128 m² | +29 m² +29% | 2022 |
|---|
| 71, Daisy Street816 m away | 58 m² | 87 m² | +29 m² +50% | 2021 |
|---|
| 36, Wyndham Road730 m away | 78 m² | 107 m² | +29 m² +37% | 2020 |
|---|
| 24, Llanfair Road221 m away | 106 m² | 135 m² | +29 m² +27% | 2016 |
|---|
| 47, Pontcanna Street351 m away | 124 m² | 153 m² | +29 m² +23% | 2015 |
|---|
| Regina Villa, Regina Terrace575 m away | 143 m² | 172 m² | +29 m² +20% | 2014 |
|---|
| 13, Daisy Street704 m away | 70 m² | 99 m² | +29 m² +41% | 2011 |
|---|
| 7, Beda Road783 m away | 94 m² | 122 m² | +28 m² +30% | 2020 |
|---|
| 95c, Severn Grove239 m away | 28 m² | 56 m² | +28 m² +100% | 2011 |
|---|
| 18, Glamorgan Street620 m away | 79 m² | 106 m² | +27 m² +34% | 2025 |
|---|
| 16, Romilly Crescent421 m away | 69 m² | 96 m² | +27 m² +39% | 2024 |
|---|
| 36, Beda Road929 m away | 54 m² | 81 m² | +27 m² +50% | 2009 |
|---|
| 11, Cumberland Street940 m away | 97 m² | 123 m² | +26 m² +27% | 2021 |
|---|
| 90, Wyndham Crescent741 m away | 63 m² | 89 m² | +26 m² +41% | 2020 |
|---|
| 28, Alexandra Road863 m away | 88 m² | 114 m² | +26 m² +30% | 2017 |
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| 64, Theobald Road990 m away | 91 m² | 117 m² | +26 m² +29% | 2016 |
|---|
| 3, Fields Park Road223 m away | 153 m² | 179 m² | +26 m² +17% | 2011 |
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| 21, Kingsland Road948 m away | 27 m² | 53 m² | +26 m² +96% | 2010 |
|---|
| 11, Bloom Street115 m away | 76 m² | 101 m² | +25 m² +33% | 2025 |
|---|
| 7, Mortimer Road269 m away | 87 m² | 112 m² | +25 m² +29% | 2024 |
|---|
| 18, Carmarthen Street483 m away | 80 m² | 105 m² | +25 m² +31% | 2024 |
|---|
| 62, Kings Road770 m away | 128 m² | 153 m² | +25 m² +20% | 2023 |
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| 52, Beda Road929 m away | 109 m² | 134 m² | +25 m² +23% | 2023 |
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| 14, Cumberland Street940 m away | 62 m² | 87 m² | +25 m² +40% | 2019 |
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| 59, Romilly Crescent373 m away | 70 m² | 95 m² | +25 m² +36% | 2018 |
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| 6, Library Street697 m away | 129 m² | 154 m² | +25 m² +19% | 2018 |
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| 84, Pencisely Road844 m away | 68 m² | 93 m² | +25 m² +37% | 2018 |
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| 128, Severn Grove239 m away | 49 m² | 74 m² | +25 m² +51% | 2013 |
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| 30, Brecon Street612 m away | 100 m² | 125 m² | +25 m² +25% | 2013 |
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| 32, Palace Avenue963 m away | 102 m² | 127 m² | +25 m² +25% | 2012 |
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| 73, Kings Road763 m away | 63 m² | 88 m² | +25 m² +40% | 2011 |
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| 2, Church Road868 m away | 129 m² | 153 m² | +24 m² +19% | 2026 |
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| 33b, Fields Park Road223 m away | 52 m² | 76 m² | +24 m² +46% | 2025 |
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| 99, Fairleigh Road335 m away | 83 m² | 107 m² | +24 m² +29% | 2024 |
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| 4, Cardigan Court528 m away | 46 m² | 70 m² | +24 m² +52% | 2021 |
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| 22, Nesta Road899 m away | 102 m² | 126 m² | +24 m² +24% | 2020 |
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| 51, Plasturton Avenue577 m away | 153 m² | 177 m² | +24 m² +16% | 2017 |
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| 21, Penhill Road0 m away | 62 m² | 86 m² | +24 m² +39% | 2016 |
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| 5, Mortimer Road269 m away | 102 m² | 126 m² | +24 m² +24% | 2011 |
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| 3, Bloom Street115 m away | 71 m² | 94 m² | +23 m² +32% | 2026 |
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| 23, Victoria Avenue800 m away | 89 m² | 112 m² | +23 m² +26% | 2021 |
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| 21, Greenwich Road773 m away | 149 m² | 172 m² | +23 m² +15% | 2013 |
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| Flat 1, Conway Court, 18, Penhill Road0 m away | 117 m² | 139 m² | +22 m² +19% | 2025 |
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| 75, Daisy Street816 m away | 69 m² | 91 m² | +22 m² +32% | 2020 |
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| 34, Wyndham Crescent888 m away | 101 m² | 123 m² | +22 m² +22% | 2016 |
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| 16, Conway Road277 m away | 59 m² | 81 m² | +22 m² +37% | 2014 |
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| 1, Egerton Mews649 m away | 87 m² | 109 m² | +22 m² +25% | 2012 |
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| 67, Romilly Crescent373 m away | 16 m² | 38 m² | +22 m² +138% | 2010 |
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| 119, Romilly Road550 m away | 15 m² | 37 m² | +22 m² +147% | 2009 |
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| 139, Cathedral Road564 m away | 24 m² | 46 m² | +22 m² +92% | 2009 |
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| 2, Fairleigh Road274 m away | 107 m² | 128 m² | +21 m² +20% | 2025 |
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| 18, Vishwell Road586 m away | 101 m² | 122 m² | +21 m² +21% | 2024 |
|---|
| 70, Hamilton Street983 m away | 124 m² | 145 m² | +21 m² +17% | 2023 |
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| 489, Cowbridge Road East940 m away | 106 m² | 127 m² | +21 m² +20% | 2022 |
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| 14, Grosvenor Street851 m away | 46 m² | 67 m² | +21 m² +46% | 2021 |
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| 37, Talbot Street948 m away | 136 m² | 157 m² | +21 m² +15% | 2021 |
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| Flat 9, Caernarvon Court, Conway Road151 m away | 44 m² | 65 m² | +21 m² +48% | 2020 |
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| Coach House, 122a, Pembroke Road535 m away | 78 m² | 99 m² | +21 m² +27% | 2019 |
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| 95, Cathedral Road772 m away | 51 m² | 72 m² | +21 m² +41% | 2015 |
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| 32, Rectory Road424 m away | 102 m² | 123 m² | +21 m² +21% | 2014 |
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| 11, Eton Place921 m away | 111 m² | 132 m² | +21 m² +19% | 2014 |
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| 50, Alexandra Road985 m away | 74 m² | 94 m² | +20 m² +27% | 2026 |
|---|
| 13, Anglesey Street637 m away | 88 m² | 108 m² | +20 m² +23% | 2025 |
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| Flat 3, 362, Cowbridge Road East851 m away | 40 m² | 60 m² | +20 m² +50% | 2025 |
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| 28, Brecon Street612 m away | 91 m² | 111 m² | +20 m² +22% | 2023 |
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| 74, Llanfair Road94 m away | 112 m² | 132 m² | +20 m² +18% | 2022 |
|---|
| 11, Maldwyn Street259 m away | 120 m² | 140 m² | +20 m² +17% | 2021 |
|---|
| 32, Carmarthen Street532 m away | 76 m² | 96 m² | +20 m² +26% | 2020 |
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| 6, Glamorgan Street Mews649 m away | 54 m² | 74 m² | +20 m² +37% | 2019 |
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| 10, Earle Place941 m away | 113 m² | 133 m² | +20 m² +18% | 2014 |
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| 6, St Johns Crescent926 m away | 35 m² | 55 m² | +20 m² +57% | 2013 |
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| 195, Cathedral Road392 m away | 48 m² | 68 m² | +20 m² +42% | 2009 |
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| 15b, Clive Road739 m away | 63 m² | 82 m² | +19 m² +30% | 2026 |
|---|
| 15, Grosvenor Street851 m away | 110 m² | 129 m² | +19 m² +17% | 2026 |
|---|
| 362, Cowbridge Road East851 m away | 45 m² | 64 m² | +19 m² +42% | 2025 |
|---|
| 40, Severn Grove485 m away | 97 m² | 116 m² | +19 m² +20% | 2021 |
|---|
| 16, Leckwith Road999 m away | 113 m² | 132 m² | +19 m² +17% | 2021 |
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| 11, Turberville Place550 m away | 120 m² | 139 m² | +19 m² +16% | 2019 |
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| 43, Radnor Road583 m away | 79 m² | 98 m² | +19 m² +24% | 2019 |
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| Flat 4, 95, Cathedral Road772 m away | 30 m² | 49 m² | +19 m² +63% | 2018 |
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| 138a, Llandaff Road215 m away | 101 m² | 120 m² | +19 m² +19% | 2014 |
|---|
| 36, Severn Grove485 m away | 92 m² | 111 m² | +19 m² +21% | 2011 |
|---|
| 24, Burlington Terrace543 m away | 104 m² | 122 m² | +18 m² +17% | 2026 |
|---|
| 6, Palace Avenue963 m away | 107 m² | 125 m² | +18 m² +17% | 2025 |
|---|
| 5, Egham Street501 m away | 102 m² | 120 m² | +18 m² +18% | 2024 |
|---|
| 35, Egerton Street649 m away | 109 m² | 127 m² | +18 m² +17% | 2024 |
|---|
| 186, Llandaff Road136 m away | 41 m² | 59 m² | +18 m² +44% | 2022 |
|---|
| 27, Radnor Road583 m away | 97 m² | 115 m² | +18 m² +19% | 2022 |
|---|
| 1, Bloom Street115 m away | 73 m² | 91 m² | +18 m² +25% | 2021 |
|---|
| 28, Brunswick Street825 m away | 93 m² | 111 m² | +18 m² +19% | 2021 |
|---|
| 113, Kings Road763 m away | 61 m² | 79 m² | +18 m² +30% | 2017 |
|---|
| 137, Clive Road536 m away | 66 m² | 84 m² | +18 m² +27% | 2015 |
|---|
| The Town House, 5, Romilly Road371 m away | 58 m² | 76 m² | +18 m² +31% | 2014 |
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| 138, Cathedral Road520 m away | 60 m² | 78 m² | +18 m² +30% | 2010 |
|---|
| 154, Cathedral Road455 m away | 50 m² | 68 m² | +18 m² +36% | 2009 |
|---|
| 14, Romilly Road550 m away | 30 m² | 48 m² | +18 m² +60% | 2009 |
|---|
| 41, Loftus Street741 m away | 72 m² | 89 m² | +17 m² +24% | 2026 |
|---|
| 3, Dogo Street456 m away | 74 m² | 91 m² | +17 m² +23% | 2025 |
|---|
| 76, Wyndham Road618 m away | 90 m² | 107 m² | +17 m² +19% | 2025 |
|---|
| 4, Mortimer Road269 m away | 92 m² | 109 m² | +17 m² +18% | 2024 |
|---|
| 13, Severn Grove485 m away | 77 m² | 94 m² | +17 m² +22% | 2024 |
|---|
| 26, Daisy Street704 m away | 73 m² | 90 m² | +17 m² +23% | 2023 |
|---|
| 79, Hamilton Street983 m away | 71 m² | 88 m² | +17 m² +24% | 2017 |
|---|
| 63, Cathedral Road864 m away | 34 m² | 51 m² | +17 m² +50% | 2015 |
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