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 9PX
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 Road548 m away | 166 m² | 342 m² | +176 m² +106% | 2016 |
| 93, Cathedral Road821 m away | 116 m² | 280 m² | +164 m² +141% | 2023 |
| 29, Romilly Road West533 m away | 125 m² | 278 m² | +153 m² +122% | 2016 |
| 121, Pencisely Road799 m away | 167 m² | 287 m² | +120 m² +72% | 2024 |
| 2a, William Street337 m away | 72 m² | 179 m² | +107 m² +149% | 2022 |
| 184, Lansdowne Road853 m away | 109 m² | 212 m² | +103 m² +94% | 2026 |
| 23, Pontcanna Place287 m away | 78 m² | 175 m² | +97 m² +124% | 2025 |
| 9, St Michaels Road823 m away | 147 m² | 237 m² | +90 m² +61% | 2025 |
| 47, Talbot Street968 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 Street730 m away | 97 m² | 181 m² | +84 m² +87% | 2014 |
|---|
| 5, Dyfrig Street719 m away | 64 m² | 134 m² | +70 m² +109% | 2008 |
|---|
| 7, Pencisely Avenue925 m away | 118 m² | 185 m² | +67 m² +57% | 2023 |
|---|
| 12, Kyveilog Street662 m away | 76 m² | 142 m² | +66 m² +87% | 2019 |
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| 122, Severn Grove308 m away | 128 m² | 193 m² | +65 m² +51% | 2015 |
|---|
| 23, Teilo Street515 m away | 82 m² | 147 m² | +65 m² +79% | 2015 |
|---|
| 78, Plasturton Avenue503 m away | 74 m² | 135 m² | +61 m² +82% | 2024 |
|---|
| 12, Westbury Terrace601 m away | 51 m² | 110 m² | +59 m² +116% | 2025 |
|---|
| 6, Chargot Road759 m away | 169 m² | 228 m² | +59 m² +35% | 2024 |
|---|
| 22, Surrey Street863 m away | 42 m² | 99 m² | +57 m² +136% | 2015 |
|---|
| 14, St Johns Crescent853 m away | 121 m² | 178 m² | +57 m² +47% | 2012 |
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| 14, St Michaels Road854 m away | 155 m² | 211 m² | +56 m² +36% | 2015 |
|---|
| 49, Pencisely Crescent937 m away | 70 m² | 125 m² | +55 m² +79% | 2025 |
|---|
| 23, York Street784 m away | 74 m² | 128 m² | +54 m² +73% | 2024 |
|---|
| 3, Carmarthen Street440 m away | 79 m² | 132 m² | +53 m² +67% | 2014 |
|---|
| 29, Lansdowne Road976 m away | 63 m² | 114 m² | +51 m² +81% | 2018 |
|---|
| 127, Llandaff Road320 m away | 122 m² | 172 m² | +50 m² +41% | 2024 |
|---|
| 23, Cae Syr Dafydd106 m away | 70 m² | 120 m² | +50 m² +71% | 2014 |
|---|
| 60, Cathedral Road938 m away | 43 m² | 93 m² | +50 m² +116% | 2013 |
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| 34, St Michaels Road854 m away | 157 m² | 206 m² | +49 m² +31% | 2024 |
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| 7, Ryder Street916 m away | 160 m² | 208 m² | +48 m² +30% | 2023 |
|---|
| 1, Berthwin Street630 m away | 61 m² | 109 m² | +48 m² +79% | 2021 |
|---|
| 19, Gileston Road462 m away | 125 m² | 173 m² | +48 m² +38% | 2019 |
|---|
| Cwrt Soffia, 47 - 53, Cathedral Road957 m away | 81 m² | 128 m² | +47 m² +58% | 2008 |
|---|
| 33, Teilo Street515 m away | 156 m² | 202 m² | +46 m² +29% | 2026 |
|---|
| 51, Lansdowne Road976 m away | 83 m² | 129 m² | +46 m² +55% | 2019 |
|---|
| 7, Wembley Road783 m away | 70 m² | 115 m² | +45 m² +64% | 2015 |
|---|
| 14, Pencisely Rise806 m away | 121 m² | 165 m² | +44 m² +36% | 2026 |
|---|
| 13, Forrest Road677 m away | 123 m² | 167 m² | +44 m² +36% | 2020 |
|---|
| 33, Ovington Terrace578 m away | 143 m² | 187 m² | +44 m² +31% | 2019 |
|---|
| 481, Cowbridge Road East737 m away | 55 m² | 99 m² | +44 m² +80% | 2012 |
|---|
| Flat 4, 78, Cathedral Road826 m away | 75 m² | 118 m² | +43 m² +57% | 2023 |
|---|
| 18, Egerton Street492 m away | 75 m² | 118 m² | +43 m² +57% | 2020 |
|---|
| 76, Wyndham Crescent736 m away | 182 m² | 225 m² | +43 m² +24% | 2016 |
|---|
| 42, Plasturton Gardens779 m away | 212 m² | 254 m² | +42 m² +20% | 2025 |
|---|
| 133, Clive Road428 m away | 47 m² | 88 m² | +41 m² +87% | 2021 |
|---|
| 28, Palace Road771 m away | 233 m² | 274 m² | +41 m² +18% | 2020 |
|---|
| 5, Egerton Street515 m away | 101 m² | 142 m² | +41 m² +41% | 2011 |
|---|
| 47, Conybeare Road549 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 Grove308 m away | 141 m² | 180 m² | +39 m² +28% | 2025 |
|---|
| The Croft, Llandaff Road0 m away | 220 m² | 259 m² | +39 m² +18% | 2021 |
|---|
| 20, Victoria Park Road East852 m away | 108 m² | 146 m² | +38 m² +35% | 2017 |
|---|
| 33, Lansdowne Road976 m away | 77 m² | 115 m² | +38 m² +49% | 2010 |
|---|
| 26, Pencisely Crescent943 m away | 114 m² | 151 m² | +37 m² +32% | 2026 |
|---|
| 67, Fairleigh Road467 m away | 95 m² | 132 m² | +37 m² +39% | 2023 |
|---|
| 15, Fields Park Road359 m away | 172 m² | 209 m² | +37 m² +22% | 2022 |
|---|
| 31, Daisy Street575 m away | 66 m² | 102 m² | +36 m² +55% | 2024 |
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| 39, Market Road505 m away | 94 m² | 130 m² | +36 m² +38% | 2022 |
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| 25, Halsbury Road641 m away | 93 m² | 129 m² | +36 m² +39% | 2015 |
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| 75, Romilly Crescent331 m away | 150 m² | 186 m² | +36 m² +24% | 2014 |
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| 201, Cathedral Road484 m away | 61 m² | 97 m² | +36 m² +59% | 2014 |
|---|
| 1, Tintern Street681 m away | 66 m² | 102 m² | +36 m² +55% | 2012 |
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| Flat 2, 38, Glamorgan Street522 m away | 43 m² | 79 m² | +36 m² +84% | 2010 |
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| 112, Pembroke Road401 m away | 89 m² | 124 m² | +35 m² +39% | 2024 |
|---|
| 15, Greenwich Road678 m away | 82 m² | 117 m² | +35 m² +43% | 2022 |
|---|
| 23, Chargot Road759 m away | 179 m² | 214 m² | +35 m² +20% | 2022 |
|---|
| 136b, Llandaff Road123 m away | 104 m² | 139 m² | +35 m² +34% | 2019 |
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| 190, Cathedral Road501 m away | 53 m² | 88 m² | +35 m² +66% | 2010 |
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| 13, Fairleigh Road408 m away | 118 m² | 152 m² | +34 m² +29% | 2025 |
|---|
| 63, Clive Road504 m away | 34 m² | 68 m² | +34 m² +100% | 2022 |
|---|
| 37, Severn Grove381 m away | 48 m² | 82 m² | +34 m² +71% | 2021 |
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| 29, Plasturton Gardens756 m away | 141 m² | 175 m² | +34 m² +24% | 2021 |
|---|
| 123, Clive Road458 m away | 113 m² | 147 m² | +34 m² +30% | 2013 |
|---|
| 16, Westbury Terrace601 m away | 72 m² | 105 m² | +33 m² +46% | 2026 |
|---|
| 3, St Michaels Road823 m away | 184 m² | 217 m² | +33 m² +18% | 2026 |
|---|
| 67, Plasturton Avenue491 m away | 171 m² | 204 m² | +33 m² +19% | 2023 |
|---|
| 97, Kings Road774 m away | 149 m² | 182 m² | +33 m² +22% | 2021 |
|---|
| 1a, Teilo Street515 m away | 144 m² | 177 m² | +33 m² +23% | 2020 |
|---|
| 324, Cowbridge Road East669 m away | 37 m² | 70 m² | +33 m² +89% | 2018 |
|---|
| 29, Rectory Road339 m away | 46 m² | 79 m² | +33 m² +72% | 2012 |
|---|
| 108, Wyndham Road621 m away | 93 m² | 126 m² | +33 m² +35% | 2011 |
|---|
| 98, Clive Road428 m away | 140 m² | 173 m² | +33 m² +24% | 2010 |
|---|
| 12, Preswylfa Street369 m away | 93 m² | 125 m² | +32 m² +34% | 2026 |
|---|
| 215, Lansdowne Road893 m away | 59 m² | 91 m² | +32 m² +54% | 2026 |
|---|
| 29, Wembley Road783 m away | 92 m² | 124 m² | +32 m² +35% | 2025 |
|---|
| Flat 1, Kings Mews, Kings Road977 m away | 35 m² | 67 m² | +32 m² +91% | 2025 |
|---|
| 10, Vishwell Road485 m away | 97 m² | 129 m² | +32 m² +33% | 2021 |
|---|
| Flat 4, 86, Cathedral Road826 m away | 55 m² | 87 m² | +32 m² +58% | 2021 |
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| 119, Cathedral Road724 m away | 53 m² | 85 m² | +32 m² +60% | 2020 |
|---|
| 13, Victoria Park Road East852 m away | 51 m² | 83 m² | +32 m² +63% | 2020 |
|---|
| 35, Pen Y Peel Road467 m away | 82 m² | 113 m² | +31 m² +38% | 2023 |
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| 92, Wyndham Crescent736 m away | 57 m² | 88 m² | +31 m² +54% | 2013 |
|---|
| 29, Pontcanna Street450 m away | 122 m² | 152 m² | +30 m² +25% | 2020 |
|---|
| 1, Penhill Road272 m away | 58 m² | 88 m² | +30 m² +52% | 2019 |
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| 106, Clive Road428 m away | 129 m² | 159 m² | +30 m² +23% | 2019 |
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| 41, Kings Road868 m away | 61 m² | 91 m² | +30 m² +49% | 2017 |
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| 26, Romilly Road416 m away | 57 m² | 87 m² | +30 m² +53% | 2010 |
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| 355, Cowbridge Road East630 m away | 29 m² | 59 m² | +30 m² +103% | 2009 |
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| 9, Wyndham Road730 m away | 91 m² | 120 m² | +29 m² +32% | 2025 |
|---|
| 3, Egham Street366 m away | 99 m² | 128 m² | +29 m² +29% | 2022 |
|---|
| 71, Daisy Street689 m away | 58 m² | 87 m² | +29 m² +50% | 2021 |
|---|
| 104 - 108, Cathedral Road759 m away | 68 m² | 97 m² | +29 m² +43% | 2021 |
|---|
| 36, Wyndham Road730 m away | 78 m² | 107 m² | +29 m² +37% | 2020 |
|---|
| 24, Llanfair Road201 m away | 106 m² | 135 m² | +29 m² +27% | 2016 |
|---|
| 47, Pontcanna Street428 m away | 124 m² | 153 m² | +29 m² +23% | 2015 |
|---|
| Regina Villa, Regina Terrace461 m away | 143 m² | 172 m² | +29 m² +20% | 2014 |
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| 13, Daisy Street575 m away | 70 m² | 99 m² | +29 m² +41% | 2011 |
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| 16, Lansdowne Road946 m away | 130 m² | 158 m² | +28 m² +22% | 2026 |
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| 28, Major Road968 m away | 108 m² | 136 m² | +28 m² +26% | 2026 |
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| 7, Beda Road671 m away | 94 m² | 122 m² | +28 m² +30% | 2020 |
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| 95c, Severn Grove308 m away | 28 m² | 56 m² | +28 m² +100% | 2011 |
|---|
| 18, Glamorgan Street522 m away | 79 m² | 106 m² | +27 m² +34% | 2025 |
|---|
| 16, Romilly Crescent408 m away | 69 m² | 96 m² | +27 m² +39% | 2024 |
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| 36, Beda Road817 m away | 54 m² | 81 m² | +27 m² +50% | 2009 |
|---|
| 11, Cumberland Street845 m away | 97 m² | 123 m² | +26 m² +27% | 2021 |
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| 90, Wyndham Crescent736 m away | 63 m² | 89 m² | +26 m² +41% | 2020 |
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| 28, Alexandra Road781 m away | 88 m² | 114 m² | +26 m² +30% | 2017 |
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| 64, Theobald Road883 m away | 91 m² | 117 m² | +26 m² +29% | 2016 |
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| 3, Fields Park Road359 m away | 153 m² | 179 m² | +26 m² +17% | 2011 |
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| 21, Kingsland Road814 m away | 27 m² | 53 m² | +26 m² +96% | 2010 |
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| 11, Bloom Street60 m away | 76 m² | 101 m² | +25 m² +33% | 2025 |
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| 7, Mortimer Road368 m away | 87 m² | 112 m² | +25 m² +29% | 2024 |
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| 18, Carmarthen Street407 m away | 80 m² | 105 m² | +25 m² +31% | 2024 |
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| 62, Kings Road786 m away | 128 m² | 153 m² | +25 m² +20% | 2023 |
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| 52, Beda Road817 m away | 109 m² | 134 m² | +25 m² +23% | 2023 |
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| 14, Cumberland Street845 m away | 62 m² | 87 m² | +25 m² +40% | 2019 |
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| 59, Romilly Crescent331 m away | 70 m² | 95 m² | +25 m² +36% | 2018 |
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| 6, Library Street628 m away | 129 m² | 154 m² | +25 m² +19% | 2018 |
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| 84, Pencisely Road773 m away | 68 m² | 93 m² | +25 m² +37% | 2018 |
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| 128, Severn Grove308 m away | 49 m² | 74 m² | +25 m² +51% | 2013 |
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| 30, Brecon Street482 m away | 100 m² | 125 m² | +25 m² +25% | 2013 |
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| 32, Palace Avenue928 m away | 102 m² | 127 m² | +25 m² +25% | 2012 |
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| 73, Kings Road774 m away | 63 m² | 88 m² | +25 m² +40% | 2011 |
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| 2, Church Road803 m away | 129 m² | 153 m² | +24 m² +19% | 2026 |
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| 33b, Fields Park Road359 m away | 52 m² | 76 m² | +24 m² +46% | 2025 |
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| 99, Fairleigh Road467 m away | 83 m² | 107 m² | +24 m² +29% | 2024 |
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| 4, Cardigan Court418 m away | 46 m² | 70 m² | +24 m² +52% | 2021 |
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| 22, Nesta Road764 m away | 102 m² | 126 m² | +24 m² +24% | 2020 |
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| 51, Plasturton Avenue617 m away | 153 m² | 177 m² | +24 m² +16% | 2017 |
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| 21, Penhill Road136 m away | 62 m² | 86 m² | +24 m² +39% | 2016 |
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| 68, Cathedral Road938 m away | 50 m² | 74 m² | +24 m² +48% | 2016 |
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| 5, Mortimer Road368 m away | 102 m² | 126 m² | +24 m² +24% | 2011 |
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| 3, Bloom Street60 m away | 71 m² | 94 m² | +23 m² +32% | 2026 |
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| 23, Victoria Avenue675 m away | 89 m² | 112 m² | +23 m² +26% | 2021 |
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| 21, Greenwich Road678 m away | 149 m² | 172 m² | +23 m² +15% | 2013 |
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| Flat 1, Conway Court, 18, Penhill Road136 m away | 117 m² | 139 m² | +22 m² +19% | 2025 |
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| 75, Daisy Street689 m away | 69 m² | 91 m² | +22 m² +32% | 2020 |
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| 34, Wyndham Crescent878 m away | 101 m² | 123 m² | +22 m² +22% | 2016 |
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| 16, Conway Road288 m away | 59 m² | 81 m² | +22 m² +37% | 2014 |
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| 1, Egerton Mews515 m away | 87 m² | 109 m² | +22 m² +25% | 2012 |
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| 67, Romilly Crescent331 m away | 16 m² | 38 m² | +22 m² +138% | 2010 |
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| 70, Clive Road504 m away | 38 m² | 60 m² | +22 m² +58% | 2009 |
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| 139, Cathedral Road632 m away | 24 m² | 46 m² | +22 m² +92% | 2009 |
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| 2, Fairleigh Road408 m away | 107 m² | 128 m² | +21 m² +20% | 2025 |
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| 18, Vishwell Road485 m away | 101 m² | 122 m² | +21 m² +21% | 2024 |
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| 70, Hamilton Street986 m away | 124 m² | 145 m² | +21 m² +17% | 2023 |
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| 489, Cowbridge Road East804 m away | 106 m² | 127 m² | +21 m² +20% | 2022 |
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| 14, Grosvenor Street718 m away | 46 m² | 67 m² | +21 m² +46% | 2021 |
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| 37, Talbot Street968 m away | 136 m² | 157 m² | +21 m² +15% | 2021 |
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| Flat 9, Caernarvon Court, Conway Road194 m away | 44 m² | 65 m² | +21 m² +48% | 2020 |
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| Coach House, 122a, Pembroke Road401 m away | 78 m² | 99 m² | +21 m² +27% | 2019 |
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| 95, Cathedral Road821 m away | 51 m² | 72 m² | +21 m² +41% | 2015 |
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| 32, Rectory Road339 m away | 102 m² | 123 m² | +21 m² +21% | 2014 |
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| 11, Eton Place839 m away | 111 m² | 132 m² | +21 m² +19% | 2014 |
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| 50, Alexandra Road896 m away | 74 m² | 94 m² | +20 m² +27% | 2026 |
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| 13, Anglesey Street520 m away | 88 m² | 108 m² | +20 m² +23% | 2025 |
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| Flat 3, 362, Cowbridge Road East715 m away | 40 m² | 60 m² | +20 m² +50% | 2025 |
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| 28, Brecon Street482 m away | 91 m² | 111 m² | +20 m² +22% | 2023 |
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| 74, Llanfair Road89 m away | 112 m² | 132 m² | +20 m² +18% | 2022 |
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| 11, Maldwyn Street389 m away | 120 m² | 140 m² | +20 m² +17% | 2021 |
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| 32, Carmarthen Street440 m away | 76 m² | 96 m² | +20 m² +26% | 2020 |
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| 6, Glamorgan Street Mews548 m away | 54 m² | 74 m² | +20 m² +37% | 2019 |
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| 10, Earle Place879 m away | 113 m² | 133 m² | +20 m² +18% | 2014 |
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| 6, St Johns Crescent853 m away | 35 m² | 55 m² | +20 m² +57% | 2013 |
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| 15b, Clive Road603 m away | 63 m² | 82 m² | +19 m² +30% | 2026 |
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| 15, Grosvenor Street718 m away | 110 m² | 129 m² | +19 m² +17% | 2026 |
|---|
| 362, Cowbridge Road East715 m away | 45 m² | 64 m² | +19 m² +42% | 2025 |
|---|
| 40, Severn Grove491 m away | 97 m² | 116 m² | +19 m² +20% | 2021 |
|---|
| 16, Leckwith Road937 m away | 113 m² | 132 m² | +19 m² +17% | 2021 |
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| 43, Radnor Road457 m away | 79 m² | 98 m² | +19 m² +24% | 2019 |
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| 11, Turberville Place523 m away | 120 m² | 139 m² | +19 m² +16% | 2019 |
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| Flat 4, 95, Cathedral Road821 m away | 30 m² | 49 m² | +19 m² +63% | 2018 |
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| 138a, Llandaff Road123 m away | 101 m² | 120 m² | +19 m² +19% | 2014 |
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| 36, Severn Grove491 m away | 92 m² | 111 m² | +19 m² +21% | 2011 |
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| 24, Burlington Terrace457 m away | 104 m² | 122 m² | +18 m² +17% | 2026 |
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| 6, Palace Avenue928 m away | 107 m² | 125 m² | +18 m² +17% | 2025 |
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| 5, Egham Street366 m away | 102 m² | 120 m² | +18 m² +18% | 2024 |
|---|
| 35, Egerton Street515 m away | 109 m² | 127 m² | +18 m² +17% | 2024 |
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| 186, Llandaff Road0 m away | 41 m² | 59 m² | +18 m² +44% | 2022 |
|---|
| 27, Radnor Road457 m away | 97 m² | 115 m² | +18 m² +19% | 2022 |
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| 1, Bloom Street60 m away | 73 m² | 91 m² | +18 m² +25% | 2021 |
|---|
| 28, Brunswick Street730 m away | 93 m² | 111 m² | +18 m² +19% | 2021 |
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| 113, Kings Road774 m away | 61 m² | 79 m² | +18 m² +30% | 2017 |
|---|
| 137, Clive Road428 m away | 66 m² | 84 m² | +18 m² +27% | 2015 |
|---|
| The Town House, 5, Romilly Road260 m away | 58 m² | 76 m² | +18 m² +31% | 2014 |
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| 138, Cathedral Road604 m away | 60 m² | 78 m² | +18 m² +30% | 2010 |
|---|
| 14, Romilly Road416 m away | 30 m² | 48 m² | +18 m² +60% | 2009 |
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| 154, Cathedral Road549 m away | 50 m² | 68 m² | +18 m² +36% | 2009 |
|---|
| 41, Loftus Street604 m away | 72 m² | 89 m² | +17 m² +24% | 2026 |
|---|
| 3, Dogo Street564 m away | 74 m² | 91 m² | +17 m² +23% | 2025 |
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