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 9HE
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 Road424 m away | 166 m² | 342 m² | +176 m² +106% | 2016 |
| 93, Cathedral Road94 m away | 116 m² | 280 m² | +164 m² +141% | 2023 |
| 2a, William Street682 m away | 72 m² | 179 m² | +107 m² +149% | 2022 |
| 23, Pontcanna Place713 m away | 78 m² | 175 m² | +97 m² +124% | 2025 |
| 15, Green Street636 m away | 75 m² | 161 m² | +86 m² +115% | 2025 |
| 47, Talbot Street189 m away | 155 m² | 239 m² | +84 m² +54% | 2018 |
| 21, Brunswick Street882 m away | 97 m² | 181 m² | +84 m² +87% | 2014 |
| 174, Colum Road936 m away | 78 m² | 160 m² | +82 m² +105% | 2016 |
| 17, Queen Anne Square826 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.
| 148 m² |
| 224 m² |
| +76 m² +51% |
| 2015 |
| 8, Clare Gardens820 m away | 127 m² | 199 m² | +72 m² +57% | 2026 |
|---|
| 5, Dyfrig Street303 m away | 64 m² | 134 m² | +70 m² +109% | 2008 |
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| 20, Brook Street792 m away | 120 m² | 188 m² | +68 m² +57% | 2023 |
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| 12, Kyveilog Street382 m away | 76 m² | 142 m² | +66 m² +87% | 2019 |
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| 23, Teilo Street620 m away | 82 m² | 147 m² | +65 m² +79% | 2015 |
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| 122, Severn Grove625 m away | 128 m² | 193 m² | +65 m² +51% | 2015 |
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| 13, Colum Road892 m away | 193 m² | 255 m² | +62 m² +32% | 2019 |
|---|
| Cwrt Soffia, 47 - 53, Cathedral Road53 m away | 66 m² | 128 m² | +62 m² +94% | 2008 |
|---|
| 30, Colum Road953 m away | 75 m² | 136 m² | +61 m² +81% | 2025 |
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| 78, Plasturton Avenue437 m away | 74 m² | 135 m² | +61 m² +82% | 2024 |
|---|
| 62, Neville Street700 m away | 65 m² | 123 m² | +58 m² +89% | 2022 |
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| 24, Wells Street702 m away | 178 m² | 236 m² | +58 m² +33% | 2020 |
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| 25a, Neville Street555 m away | 139 m² | 197 m² | +58 m² +42% | 2014 |
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| 19, Queen Anne Square826 m away | 149 m² | 206 m² | +57 m² +38% | 2022 |
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| 14, St Johns Crescent771 m away | 121 m² | 178 m² | +57 m² +47% | 2012 |
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| 3, Carmarthen Street786 m away | 79 m² | 132 m² | +53 m² +67% | 2014 |
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| 33, Penhill Road864 m away | 84 m² | 137 m² | +53 m² +63% | 2009 |
|---|
| 66, Neville Street700 m away | 77 m² | 129 m² | +52 m² +68% | 2021 |
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| 6, Clare Gardens820 m away | 160 m² | 211 m² | +51 m² +32% | 2016 |
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| 127, Llandaff Road722 m away | 122 m² | 172 m² | +50 m² +41% | 2024 |
|---|
| 23, Cae Syr Dafydd926 m away | 70 m² | 120 m² | +50 m² +71% | 2014 |
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| 60, Cathedral Road66 m away | 43 m² | 93 m² | +50 m² +116% | 2013 |
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| 54, Neville Street545 m away | 79 m² | 129 m² | +50 m² +63% | 2008 |
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| 45, Atlas Road963 m away | 177 m² | 226 m² | +49 m² +28% | 2020 |
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| 7, Ryder Street112 m away | 160 m² | 208 m² | +48 m² +30% | 2023 |
|---|
| 1, Berthwin Street427 m away | 61 m² | 109 m² | +48 m² +79% | 2021 |
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| 19, Gileston Road666 m away | 125 m² | 173 m² | +48 m² +38% | 2019 |
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| 31, Craddock Street851 m away | 88 m² | 135 m² | +47 m² +53% | 2024 |
|---|
| 33, Teilo Street620 m away | 156 m² | 202 m² | +46 m² +29% | 2026 |
|---|
| Flat 4, 78, Cathedral Road131 m away | 75 m² | 118 m² | +43 m² +57% | 2023 |
|---|
| 14, North Road728 m away | 67 m² | 110 m² | +43 m² +64% | 2022 |
|---|
| 76, Wyndham Crescent338 m away | 182 m² | 225 m² | +43 m² +24% | 2016 |
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| 42, Plasturton Gardens130 m away | 212 m² | 254 m² | +42 m² +20% | 2025 |
|---|
| 76, Cathedral Road131 m away | 41 m² | 83 m² | +42 m² +102% | 2022 |
|---|
| 11, Clare Gardens820 m away | 29 m² | 71 m² | +42 m² +145% | 2017 |
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| 82, Ninian Park Road842 m away | 67 m² | 108 m² | +41 m² +61% | 2024 |
|---|
| Apartment 8, The Hamilton'S, Cathedral Road268 m away | 67 m² | 108 m² | +41 m² +61% | 2023 |
|---|
| 21, Wyndham Road311 m away | 91 m² | 130 m² | +39 m² +43% | 2026 |
|---|
| 100, Severn Grove625 m away | 141 m² | 180 m² | +39 m² +28% | 2025 |
|---|
| The Croft, Llandaff Road909 m away | 220 m² | 259 m² | +39 m² +18% | 2021 |
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| 40, Beauchamp Street898 m away | 45 m² | 84 m² | +39 m² +87% | 2008 |
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| 101, Ninian Park Road875 m away | 29 m² | 67 m² | +38 m² +131% | 2020 |
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| 67, Fairleigh Road745 m away | 95 m² | 132 m² | +37 m² +39% | 2023 |
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| 15, Fields Park Road821 m away | 172 m² | 209 m² | +37 m² +22% | 2022 |
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| 16, Neville Street545 m away | 43 m² | 80 m² | +37 m² +86% | 2009 |
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| 39, Market Road760 m away | 94 m² | 130 m² | +36 m² +38% | 2022 |
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| 55, North Road928 m away | 88 m² | 124 m² | +36 m² +41% | 2018 |
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| 29, Rennie Street736 m away | 93 m² | 129 m² | +36 m² +39% | 2016 |
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| 201, Cathedral Road515 m away | 61 m² | 97 m² | +36 m² +59% | 2014 |
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| 75, Romilly Crescent645 m away | 150 m² | 186 m² | +36 m² +24% | 2014 |
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| Flat 2, 38, Glamorgan Street830 m away | 43 m² | 79 m² | +36 m² +84% | 2010 |
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| 55 - 57, Despenser Street837 m away | 32 m² | 67 m² | +35 m² +109% | 2026 |
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| 136b, Llandaff Road828 m away | 104 m² | 139 m² | +35 m² +34% | 2019 |
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| 190, Cathedral Road555 m away | 53 m² | 88 m² | +35 m² +66% | 2010 |
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| 13, Fairleigh Road889 m away | 118 m² | 152 m² | +34 m² +29% | 2025 |
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| 29, Plasturton Gardens178 m away | 141 m² | 175 m² | +34 m² +24% | 2021 |
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| 37, Severn Grove531 m away | 48 m² | 82 m² | +34 m² +71% | 2021 |
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| 27, Neville Street555 m away | 193 m² | 227 m² | +34 m² +18% | 2021 |
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| 6, Clare Street948 m away | 39 m² | 73 m² | +34 m² +87% | 2009 |
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| 67, Plasturton Avenue426 m away | 171 m² | 204 m² | +33 m² +19% | 2023 |
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| 51, Canton Court527 m away | 50 m² | 83 m² | +33 m² +66% | 2023 |
|---|
| 15, Despenser Street837 m away | 142 m² | 175 m² | +33 m² +23% | 2023 |
|---|
| 97, Kings Road244 m away | 149 m² | 182 m² | +33 m² +22% | 2021 |
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| 1a, Teilo Street620 m away | 144 m² | 177 m² | +33 m² +23% | 2020 |
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| 105, Cowbridge Road East477 m away | 96 m² | 129 m² | +33 m² +34% | 2019 |
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| 68, Cathedral Road66 m away | 42 m² | 75 m² | +33 m² +79% | 2016 |
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| Flat 28, Edinburgh Court, Wyndham Place665 m away | 34 m² | 67 m² | +33 m² +97% | 2013 |
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| 29, Rectory Road756 m away | 46 m² | 79 m² | +33 m² +72% | 2012 |
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| 108, Wyndham Road354 m away | 93 m² | 126 m² | +33 m² +35% | 2011 |
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| 6, Hamilton Street228 m away | 134 m² | 167 m² | +33 m² +25% | 2009 |
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| Flat 1, Kings Mews, Kings Road356 m away | 35 m² | 67 m² | +32 m² +91% | 2025 |
|---|
| Flat 4, 86, Cathedral Road131 m away | 55 m² | 87 m² | +32 m² +58% | 2021 |
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| 119, Cathedral Road210 m away | 53 m² | 85 m² | +32 m² +60% | 2020 |
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| 176, Colum Road936 m away | 103 m² | 135 m² | +32 m² +31% | 2017 |
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| 17, Colum Road892 m away | 114 m² | 146 m² | +32 m² +28% | 2015 |
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| 30, Wells Street702 m away | 84 m² | 116 m² | +32 m² +38% | 2014 |
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| 26, De Burgh Street647 m away | 123 m² | 155 m² | +32 m² +26% | 2009 |
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| 35, Pen Y Peel Road925 m away | 82 m² | 113 m² | +31 m² +38% | 2023 |
|---|
| 12, Hamilton Street228 m away | 141 m² | 172 m² | +31 m² +22% | 2022 |
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| 22, Canton Court555 m away | 94 m² | 125 m² | +31 m² +33% | 2014 |
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| 92, Wyndham Crescent338 m away | 57 m² | 88 m² | +31 m² +54% | 2013 |
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| 13, Despenser Street837 m away | 139 m² | 170 m² | +31 m² +22% | 2013 |
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| 29, Pontcanna Street463 m away | 122 m² | 152 m² | +30 m² +25% | 2020 |
|---|
| 1, Penhill Road767 m away | 58 m² | 88 m² | +30 m² +52% | 2019 |
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| 31, Hamilton Street228 m away | 130 m² | 160 m² | +30 m² +23% | 2017 |
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| 41, Kings Road314 m away | 61 m² | 91 m² | +30 m² +49% | 2017 |
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| 9, Wyndham Road311 m away | 91 m² | 120 m² | +29 m² +32% | 2025 |
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| 27, Brook Street736 m away | 99 m² | 128 m² | +29 m² +29% | 2025 |
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| 11, Wyndham Place584 m away | 84 m² | 113 m² | +29 m² +35% | 2022 |
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| 36, Wyndham Road311 m away | 78 m² | 107 m² | +29 m² +37% | 2020 |
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| 24, Llanfair Road714 m away | 106 m² | 135 m² | +29 m² +27% | 2016 |
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| 47, Pontcanna Street523 m away | 124 m² | 153 m² | +29 m² +23% | 2015 |
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| 61, Colum Road874 m away | 41 m² | 70 m² | +29 m² +71% | 2009 |
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| 28, Major Road810 m away | 108 m² | 136 m² | +28 m² +26% | 2026 |
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| 34, Brook Street792 m away | 45 m² | 73 m² | +28 m² +62% | 2025 |
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| 7, Colum Road892 m away | 156 m² | 184 m² | +28 m² +18% | 2024 |
|---|
| 11, Hamilton Street228 m away | 136 m² | 164 m² | +28 m² +21% | 2021 |
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| 7, Beda Road987 m away | 94 m² | 122 m² | +28 m² +30% | 2020 |
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| 95c, Severn Grove625 m away | 28 m² | 56 m² | +28 m² +100% | 2011 |
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| 18, Glamorgan Street830 m away | 79 m² | 106 m² | +27 m² +34% | 2025 |
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| 16, Romilly Crescent543 m away | 69 m² | 96 m² | +27 m² +39% | 2024 |
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| 35, Colum Road892 m away | 168 m² | 195 m² | +27 m² +16% | 2018 |
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| 38, Lower Cathedral Road633 m away | 54 m² | 81 m² | +27 m² +50% | 2010 |
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| 11, Cumberland Street938 m away | 97 m² | 123 m² | +26 m² +27% | 2021 |
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| 90, Wyndham Crescent338 m away | 63 m² | 89 m² | +26 m² +41% | 2020 |
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| 28, Alexandra Road807 m away | 88 m² | 114 m² | +26 m² +30% | 2017 |
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| 3, Fields Park Road821 m away | 153 m² | 179 m² | +26 m² +17% | 2011 |
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| 11, Bloom Street850 m away | 76 m² | 101 m² | +25 m² +33% | 2025 |
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| 7, Mortimer Road624 m away | 87 m² | 112 m² | +25 m² +29% | 2024 |
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| 18, Carmarthen Street717 m away | 80 m² | 105 m² | +25 m² +31% | 2024 |
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| 62, Kings Road215 m away | 128 m² | 153 m² | +25 m² +20% | 2023 |
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| 16, Telford Street804 m away | 89 m² | 114 m² | +25 m² +28% | 2022 |
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| 14, Cumberland Street938 m away | 62 m² | 87 m² | +25 m² +40% | 2019 |
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| 59, Romilly Crescent645 m away | 70 m² | 95 m² | +25 m² +36% | 2018 |
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| 6, Library Street678 m away | 129 m² | 154 m² | +25 m² +19% | 2018 |
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| 128, Severn Grove625 m away | 49 m² | 74 m² | +25 m² +51% | 2013 |
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| 73, Kings Road244 m away | 63 m² | 88 m² | +25 m² +40% | 2011 |
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| 2, Church Road694 m away | 129 m² | 153 m² | +24 m² +19% | 2026 |
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| 33b, Fields Park Road821 m away | 52 m² | 76 m² | +24 m² +46% | 2025 |
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| 99, Fairleigh Road745 m away | 83 m² | 107 m² | +24 m² +29% | 2024 |
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| 10, Rawden Place574 m away | 123 m² | 147 m² | +24 m² +20% | 2023 |
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| 4, Rawden Place574 m away | 119 m² | 143 m² | +24 m² +20% | 2023 |
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| 4, Cardigan Court873 m away | 46 m² | 70 m² | +24 m² +52% | 2021 |
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| 51, Brook Street736 m away | 40 m² | 64 m² | +24 m² +60% | 2019 |
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| 51, Plasturton Avenue292 m away | 153 m² | 177 m² | +24 m² +16% | 2017 |
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| 21, Penhill Road864 m away | 62 m² | 86 m² | +24 m² +39% | 2016 |
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| 5, Mortimer Road624 m away | 102 m² | 126 m² | +24 m² +24% | 2011 |
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| 3, Bloom Street850 m away | 71 m² | 94 m² | +23 m² +32% | 2026 |
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| 73, Wells Street767 m away | 90 m² | 113 m² | +23 m² +26% | 2025 |
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| 17, Clare Street900 m away | 30 m² | 53 m² | +23 m² +77% | 2024 |
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| Flat 2, Windsor House, Westgate Street988 m away | 46 m² | 69 m² | +23 m² +50% | 2014 |
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| Flat 1, Conway Court, 18, Penhill Road864 m away | 117 m² | 139 m² | +22 m² +19% | 2025 |
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| 11, Leckwith Place984 m away | 94 m² | 116 m² | +22 m² +23% | 2022 |
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| 33, West Lee427 m away | 58 m² | 80 m² | +22 m² +38% | 2021 |
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| 27, Ninian Park Road948 m away | 96 m² | 118 m² | +22 m² +23% | 2020 |
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| 27, Colum Road892 m away | 30 m² | 52 m² | +22 m² +73% | 2018 |
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| 34, Wyndham Crescent363 m away | 101 m² | 123 m² | +22 m² +22% | 2016 |
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| 3, Colum Place973 m away | 98 m² | 120 m² | +22 m² +22% | 2016 |
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| 16, Conway Road623 m away | 59 m² | 81 m² | +22 m² +37% | 2014 |
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| 67, Romilly Crescent645 m away | 16 m² | 38 m² | +22 m² +138% | 2010 |
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| 139, Cathedral Road319 m away | 24 m² | 46 m² | +22 m² +92% | 2009 |
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| 2, Fairleigh Road889 m away | 107 m² | 128 m² | +21 m² +20% | 2025 |
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| 5, Craddock Street851 m away | 78 m² | 99 m² | +21 m² +27% | 2024 |
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| 70, Hamilton Street307 m away | 124 m² | 145 m² | +21 m² +17% | 2023 |
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| 10, Wyndham Place584 m away | 92 m² | 113 m² | +21 m² +23% | 2022 |
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| 37, Talbot Street189 m away | 136 m² | 157 m² | +21 m² +15% | 2021 |
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| Flat 9, Caernarvon Court, Conway Road724 m away | 44 m² | 65 m² | +21 m² +48% | 2020 |
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| 54, Colum Road922 m away | 33 m² | 54 m² | +21 m² +64% | 2017 |
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| 12, Ninian Park Road930 m away | 40 m² | 61 m² | +21 m² +53% | 2017 |
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| 95, Cathedral Road94 m away | 51 m² | 72 m² | +21 m² +41% | 2015 |
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| 6, Ryder Street279 m away | 129 m² | 150 m² | +21 m² +16% | 2015 |
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| 3 - 5, Brook Street736 m away | 59 m² | 80 m² | +21 m² +36% | 2015 |
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| 32, Rectory Road756 m away | 102 m² | 123 m² | +21 m² +21% | 2014 |
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| 11, Eton Place832 m away | 111 m² | 132 m² | +21 m² +19% | 2014 |
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| 50, Alexandra Road915 m away | 74 m² | 94 m² | +20 m² +27% | 2026 |
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| Apartment 13, Cathedral House, Hamilton Street239 m away | 96 m² | 116 m² | +20 m² +21% | 2025 |
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| 13, Anglesey Street955 m away | 88 m² | 108 m² | +20 m² +23% | 2025 |
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| 74, Llanfair Road828 m away | 112 m² | 132 m² | +20 m² +18% | 2022 |
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| 11, Maldwyn Street738 m away | 120 m² | 140 m² | +20 m² +17% | 2021 |
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| 32, Carmarthen Street786 m away | 76 m² | 96 m² | +20 m² +26% | 2020 |
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| Flat 1, 30, Brook Street792 m away | 53 m² | 73 m² | +20 m² +38% | 2020 |
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| 6, Glamorgan Street Mews860 m away | 54 m² | 74 m² | +20 m² +37% | 2019 |
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| 10, Earle Place710 m away | 113 m² | 133 m² | +20 m² +18% | 2014 |
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| Flat 5, Warwick House, Westgate Street967 m away | 69 m² | 89 m² | +20 m² +29% | 2014 |
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| 6, St Johns Crescent771 m away | 35 m² | 55 m² | +20 m² +57% | 2013 |
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| 195, Cathedral Road515 m away | 48 m² | 68 m² | +20 m² +42% | 2009 |
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| 121, Ninian Park Road875 m away | 103 m² | 122 m² | +19 m² +18% | 2022 |
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| 40, Severn Grove442 m away | 97 m² | 116 m² | +19 m² +20% | 2021 |
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| 32, Chancery Lane718 m away | 76 m² | 95 m² | +19 m² +25% | 2021 |
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| 16, Leckwith Road732 m away | 113 m² | 132 m² | +19 m² +17% | 2021 |
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| 43, Wyndham Street644 m away | 68 m² | 87 m² | +19 m² +28% | 2020 |
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| 11, Turberville Place507 m away | 120 m² | 139 m² | +19 m² +16% | 2019 |
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| Flat 4, 95, Cathedral Road94 m away | 30 m² | 49 m² | +19 m² +63% | 2018 |
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| 138a, Llandaff Road828 m away | 101 m² | 120 m² | +19 m² +19% | 2014 |
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| 36, Severn Grove442 m away | 92 m² | 111 m² | +19 m² +21% | 2011 |
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| 12 Gwynt Mews, 30, Cathedral Road186 m away | 52 m² | 70 m² | +18 m² +35% | 2026 |
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| 186, Llandaff Road909 m away | 41 m² | 59 m² | +18 m² +44% | 2022 |
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| 1, Bloom Street850 m away | 73 m² | 91 m² | +18 m² +25% | 2021 |
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| 28, Brunswick Street882 m away | 93 m² | 111 m² | +18 m² +19% | 2021 |
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| 109, Tudor Street998 m away | 39 m² | 57 m² | +18 m² +46% | 2021 |
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| 13, Chancery Lane736 m away | 75 m² | 93 m² | +18 m² +24% | 2020 |
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| 113, Kings Road244 m away | 61 m² | 79 m² | +18 m² +30% | 2017 |
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| The Town House, 5, Romilly Road857 m away | 58 m² | 76 m² | +18 m² +31% | 2014 |
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| 138, Cathedral Road398 m away | 60 m² | 78 m² | +18 m² +30% | 2010 |
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| 3, Lock Keepers Court, Blackweir Terrace973 m away | 62 m² | 80 m² | +18 m² +29% | 2010 |
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| 154, Cathedral Road476 m away | 50 m² | 68 m² | +18 m² +36% | 2009 |
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| 5, Brunel Street873 m away | 111 m² | 128 m² | +17 m² +15% | 2026 |
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| 76, Wyndham Road354 m away | 90 m² | 107 m² | +17 m² +19% | 2025 |
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| 3, Dogo Street538 m away | 74 m² | 91 m² | +17 m² +23% | 2025 |
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| 13, Severn Grove442 m away | 77 m² | 94 m² | +17 m² +22% | 2024 |
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| 4, Mortimer Road624 m away | 92 m² | 109 m² | +17 m² +18% | 2024 |
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