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 BN21 4BD
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 |
|---|---|---|---|---|
| Flat 1, 13, Arlington Road856 m away | 152 m² | 305 m² | +153 m² +101% | 2022 |
| 20, Furness Road514 m away | 84 m² | 199 m² | +115 m² +137% | 2025 |
| 12a, Grove Road684 m away | 130 m² | 230 m² | +100 m² +77% | 2025 |
| 17, South Cliff Avenue670 m away | 214 m² | 310 m² | +96 m² +45% | 2022 |
| The Tiles, 2, Furness Road514 m away | 120 m² | 212 m² | +92 m² +77% | 2024 |
| 95, Pevensey Road869 m away | 152 m² | 242 m² | +90 m² +59% | 2020 |
| Flat 54, Devonshire Mansions, 54, Grand Parade167 m away | 77 m² | 162 m² | +85 m² +110% | 2011 |
| 97, Ashford Road785 m away | 66 m² | 141 m² | +75 m² +114% | 2023 |
| 8, College Road354 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.
| 120 m² |
| 193 m² |
| +73 m² +61% |
| 2012 |
| 7, West Terrace612 m away | 128 m² | 197 m² | +69 m² +54% | 2025 |
|---|
| Flat 2, Ayra Court, 1, South Cliff600 m away | 134 m² | 202 m² | +68 m² +51% | 2011 |
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| Flat 10, Lamont Court, 15 - 16, Wilmington Square328 m away | 76 m² | 139 m² | +63 m² +83% | 2025 |
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| 45, South Street456 m away | 45 m² | 107 m² | +62 m² +138% | 2024 |
|---|
| 14, Arlington Road856 m away | 331 m² | 388 m² | +57 m² +17% | 2019 |
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| 43, Pevensey Road586 m away | 180 m² | 233 m² | +53 m² +29% | 2025 |
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| 1, Elms Avenue475 m away | 93 m² | 145 m² | +52 m² +56% | 2026 |
|---|
| 24, Grange Road630 m away | 278 m² | 330 m² | +52 m² +19% | 2025 |
|---|
| 18a, Cornfield Terrace212 m away | 137 m² | 189 m² | +52 m² +38% | 2013 |
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| Flat 15, St Johns House, 28, St Johns Road911 m away | 165 m² | 216 m² | +51 m² +31% | 2016 |
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| Flat 3, 37, Arlington Road962 m away | 83 m² | 134 m² | +51 m² +61% | 2009 |
|---|
| 24, Furness Road514 m away | 238 m² | 288 m² | +50 m² +21% | 2018 |
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| 9, Willowfield Road947 m away | 156 m² | 206 m² | +50 m² +32% | 2010 |
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| 44, Cavendish Place630 m away | 170 m² | 218 m² | +48 m² +28% | 2019 |
|---|
| Flat 1, Pearl Court, Devonshire Place214 m away | 119 m² | 167 m² | +48 m² +40% | 2017 |
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| 158, Ashford Road876 m away | 53 m² | 99 m² | +46 m² +87% | 2020 |
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| 7, Lushington Road408 m away | 72 m² | 118 m² | +46 m² +64% | 2011 |
|---|
| 89a, South Street362 m away | 59 m² | 104 m² | +45 m² +76% | 2010 |
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| 20, Arlington Road856 m away | 43 m² | 86 m² | +43 m² +100% | 2014 |
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| Flat 37, Westdown House, Hartington Place271 m away | 74 m² | 116 m² | +42 m² +57% | 2024 |
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| 85, Langney Road742 m away | 116 m² | 157 m² | +41 m² +35% | 2024 |
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| 64, Seaside948 m away | 64 m² | 105 m² | +41 m² +64% | 2022 |
|---|
| 68, Grove Road611 m away | 49 m² | 90 m² | +41 m² +84% | 2015 |
|---|
| Flat 1, Silverdale Lodge, 57, Silverdale Road868 m away | 128 m² | 168 m² | +40 m² +31% | 2026 |
|---|
| 93, Pevensey Road869 m away | 35 m² | 74 m² | +39 m² +111% | 2012 |
|---|
| Flat 4, 24, Upperton Gardens976 m away | 74 m² | 112 m² | +38 m² +51% | 2025 |
|---|
| 11, West Terrace612 m away | 56 m² | 94 m² | +38 m² +68% | 2020 |
|---|
| Flat 2, 26, Seaside Road475 m away | 59 m² | 96 m² | +37 m² +63% | 2024 |
|---|
| 46, Longstone Road660 m away | 64 m² | 101 m² | +37 m² +58% | 2023 |
|---|
| Flat 3, 4, Upperton Gardens976 m away | 74 m² | 111 m² | +37 m² +50% | 2016 |
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| 87, Bourne Street945 m away | 90 m² | 126 m² | +36 m² +40% | 2022 |
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| 24, Seaside865 m away | 40 m² | 76 m² | +36 m² +90% | 2009 |
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| Flat 5, 1c, Susans Road500 m away | 33 m² | 68 m² | +35 m² +106% | 2022 |
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| Flat 1, Alastair Court, 30, Compton Street530 m away | 104 m² | 139 m² | +35 m² +34% | 2022 |
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| Flat 1, 11, Southfields Road897 m away | 95 m² | 130 m² | +35 m² +37% | 2018 |
|---|
| 25, Elms Avenue475 m away | 153 m² | 187 m² | +34 m² +22% | 2021 |
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| 176 - 180, Terminus Road406 m away | 43 m² | 77 m² | +34 m² +79% | 2013 |
|---|
| Flat 1, 29, Arlington Road962 m away | 95 m² | 128 m² | +33 m² +35% | 2014 |
|---|
| Flat 4, Silverdale Lodge, 57, Silverdale Road868 m away | 110 m² | 142 m² | +32 m² +29% | 2025 |
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| 11, West Street Mews471 m away | 31 m² | 63 m² | +32 m² +103% | 2024 |
|---|
| 36, Susans Road649 m away | 27 m² | 59 m² | +32 m² +119% | 2016 |
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| Flat 4a, Avenue Mansions, Elms Avenue481 m away | 80 m² | 111 m² | +31 m² +39% | 2025 |
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| Flat 24a, Victoria Mansions, 208, Terminus Road378 m away | 78 m² | 109 m² | +31 m² +40% | 2021 |
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| 7, Willowfield Road947 m away | 147 m² | 177 m² | +30 m² +20% | 2025 |
|---|
| 10, Bolton Road373 m away | 36 m² | 66 m² | +30 m² +83% | 2023 |
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| Flat 5, Angus House, 13, Granville Road863 m away | 105 m² | 135 m² | +30 m² +29% | 2022 |
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| Flat 1, 5, Spencer Road332 m away | 55 m² | 85 m² | +30 m² +55% | 2019 |
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| Flat 3, 9, Grassington Road750 m away | 135 m² | 165 m² | +30 m² +22% | 2016 |
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| Flat 7, Delamere Court, Hyde Road516 m away | 54 m² | 84 m² | +30 m² +56% | 2015 |
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| 10, College Road354 m away | 182 m² | 211 m² | +29 m² +16% | 2025 |
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| Minster House, York Road588 m away | 43 m² | 72 m² | +29 m² +67% | 2025 |
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| 8, Montgomery Mews, Commercial Road796 m away | 61 m² | 90 m² | +29 m² +48% | 2025 |
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| Flat 26, Sussex House, Hartington Place222 m away | 49 m² | 78 m² | +29 m² +59% | 2018 |
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| Flat 4, 9, Grange Gardens646 m away | 130 m² | 159 m² | +29 m² +22% | 2014 |
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| 11, Carlisle Road220 m away | 32 m² | 61 m² | +29 m² +91% | 2010 |
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| Flat 6, Valentine Court, South Street358 m away | 68 m² | 96 m² | +28 m² +41% | 2020 |
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| 14, Cornfield Terrace212 m away | 39 m² | 67 m² | +28 m² +72% | 2009 |
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| 44, Susans Road649 m away | 99 m² | 126 m² | +27 m² +27% | 2024 |
|---|
| 68, Susans Road709 m away | 68 m² | 95 m² | +27 m² +40% | 2023 |
|---|
| Flat 4, Pebble Court, 16, Bourne Street779 m away | 20 m² | 47 m² | +27 m² +135% | 2019 |
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| Flat 1, 21, Silverdale Road650 m away | 93 m² | 120 m² | +27 m² +29% | 2018 |
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| Flat 2, Hadley House, Upperton Road882 m away | 84 m² | 111 m² | +27 m² +32% | 2013 |
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| Flat 2, 58, Tideswell Road615 m away | 51 m² | 77 m² | +26 m² +51% | 2025 |
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| Flat 5, Pegasus Court, 29, St Leonards Road948 m away | 43 m² | 69 m² | +26 m² +60% | 2023 |
|---|
| Flat 1, 17, Old Orchard Road708 m away | 107 m² | 133 m² | +26 m² +24% | 2022 |
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| 3, Susans Road500 m away | 79 m² | 105 m² | +26 m² +33% | 2017 |
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| 123, Tideswell Road683 m away | 131 m² | 157 m² | +26 m² +20% | 2014 |
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| Flat 6, Hadley House, Upperton Road882 m away | 85 m² | 111 m² | +26 m² +31% | 2013 |
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| Flat 30, Saffrons Court, Compton Place Road906 m away | 109 m² | 134 m² | +25 m² +23% | 2025 |
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| Flat 9, Metropole Court, Royal Parade949 m away | 99 m² | 124 m² | +25 m² +25% | 2023 |
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| Flat 3, Redstone Mansions, 20, Carlisle Road918 m away | 99 m² | 124 m² | +25 m² +25% | 2019 |
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| Flat 7, Rustington Court, 8, St Johns Road755 m away | 124 m² | 149 m² | +25 m² +20% | 2012 |
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| 6, Marine Parade710 m away | 43 m² | 68 m² | +25 m² +58% | 2009 |
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| 8b, Willowfield Road947 m away | 68 m² | 92 m² | +24 m² +35% | 2023 |
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| 91, Langney Road742 m away | 122 m² | 146 m² | +24 m² +20% | 2022 |
|---|
| Flat 4, Central Court, 13, South Street584 m away | 52 m² | 76 m² | +24 m² +46% | 2021 |
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| Flat 1, Pendower, 51, Silverdale Road868 m away | 110 m² | 134 m² | +24 m² +22% | 2019 |
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| 122, Seaside Road720 m away | 29 m² | 53 m² | +24 m² +83% | 2012 |
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| 98a, Ashford Road694 m away | 63 m² | 87 m² | +24 m² +38% | 2011 |
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| 31, Pevensey Road586 m away | 30 m² | 54 m² | +24 m² +80% | 2009 |
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| 21, Pearl Court, Cornfield Terrace214 m away | 125 m² | 148 m² | +23 m² +18% | 2025 |
|---|
| Flat 5, Highcliff Court, 7, South Cliff667 m away | 79 m² | 102 m² | +23 m² +29% | 2024 |
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| Flat 5, Thornwood, The Avenue939 m away | 51 m² | 74 m² | +23 m² +45% | 2021 |
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| 5, Eton Mews919 m away | 69 m² | 92 m² | +23 m² +33% | 2020 |
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| Flat 2, 26b, Cavendish Place605 m away | 103 m² | 126 m² | +23 m² +22% | 2011 |
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| Flat 4, 5, Compton Street104 m away | 38 m² | 60 m² | +22 m² +58% | 2024 |
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| Flat 2, Central Court, 13, South Street584 m away | 51 m² | 73 m² | +22 m² +43% | 2022 |
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| Flat 1, 6, South Cliff667 m away | 61 m² | 83 m² | +22 m² +36% | 2019 |
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| Flat 6, 32, Grange Road630 m away | 53 m² | 75 m² | +22 m² +42% | 2014 |
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| 26, Jevington Gardens499 m away | 37 m² | 59 m² | +22 m² +59% | 2012 |
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| Flat 5c, Clovelly, 20, Blackwater Road448 m away | 55 m² | 77 m² | +22 m² +40% | 2010 |
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| Flat 3b, Silverdale Court, 35, Silverdale Road751 m away | 47 m² | 68 m² | +21 m² +45% | 2025 |
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| Flat 5, 12, Grassington Road700 m away | 31 m² | 52 m² | +21 m² +68% | 2024 |
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| Flat 8, Chartwell House, 1a, Wharf Road823 m away | 47 m² | 68 m² | +21 m² +45% | 2024 |
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| Flat 8, The Church, 16, Ceylon Place728 m away | 127 m² | 148 m² | +21 m² +17% | 2022 |
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| 16a, Compton Street381 m away | 66 m² | 87 m² | +21 m² +32% | 2020 |
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| Flat 3, Monk Sherborne House, 10, Granville Road846 m away | 67 m² | 88 m² | +21 m² +31% | 2014 |
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| 30, Grove Road636 m away | 64 m² | 85 m² | +21 m² +33% | 2010 |
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| Flat 48, Saffrons Court, Compton Place Road867 m away | 134 m² | 155 m² | +21 m² +16% | 2010 |
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| Flat 10, Jevington Place, Jevington Gardens541 m away | 105 m² | 125 m² | +20 m² +19% | 2026 |
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| Axis House, 23, St Leonards Road906 m away | 48 m² | 68 m² | +20 m² +42% | 2023 |
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| Flat 2, Grand Mansions 1-3, Silverdale Road577 m away | 78 m² | 98 m² | +20 m² +26% | 2021 |
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| Flat 36, Colonel Stevens Court, 10a, Granville Road870 m away | 59 m² | 79 m² | +20 m² +34% | 2021 |
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| 11, Hyde Road591 m away | 39 m² | 59 m² | +20 m² +51% | 2018 |
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| Flat 29, Grand Mansions 1-3, Silverdale Road577 m away | 63 m² | 83 m² | +20 m² +32% | 2016 |
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| 171, Terminus Road444 m away | 31 m² | 51 m² | +20 m² +65% | 2015 |
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| Flat 38, Westdown House, Hartington Place271 m away | 100 m² | 120 m² | +20 m² +20% | 2014 |
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| 18, Upperton Gardens976 m away | 26 m² | 46 m² | +20 m² +77% | 2009 |
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| Flat 3, Saffrons Mead, 2, Grassington Road714 m away | 60 m² | 79 m² | +19 m² +32% | 2026 |
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| Flat 1, 15, Ceylon Place706 m away | 53 m² | 72 m² | +19 m² +36% | 2025 |
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| Flat 1, 56, Grove Road626 m away | 45 m² | 64 m² | +19 m² +42% | 2024 |
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| Flat 10, Earlsmead Court, 15, Granville Road863 m away | 53 m² | 72 m² | +19 m² +36% | 2024 |
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| 35, Pevensey Road586 m away | 37 m² | 56 m² | +19 m² +51% | 2023 |
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| Flat 2, Stafford House, Southfields Road763 m away | 82 m² | 101 m² | +19 m² +23% | 2023 |
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| Flat 11, Southdown Heights, 38, St Leonards Road860 m away | 35 m² | 54 m² | +19 m² +54% | 2019 |
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| 21, Arlington Road856 m away | 103 m² | 122 m² | +19 m² +18% | 2016 |
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| 27, Longstone Road660 m away | 93 m² | 112 m² | +19 m² +20% | 2012 |
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| 13, The Avenue874 m away | 61 m² | 80 m² | +19 m² +31% | 2012 |
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| Flat 4, Birley House, 13, College Road418 m away | 62 m² | 80 m² | +18 m² +29% | 2023 |
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| Flat 5, 10, Saffrons Road852 m away | 86 m² | 104 m² | +18 m² +21% | 2022 |
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| Flat 3, 14, College Road354 m away | 44 m² | 62 m² | +18 m² +41% | 2021 |
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| 7b, Bolton Road398 m away | 34 m² | 52 m² | +18 m² +53% | 2019 |
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| 52, Longstone Road747 m away | 109 m² | 127 m² | +18 m² +17% | 2019 |
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| Flat 10, Victoria Court, 24 - 26, Burlington Place65 m away | 48 m² | 66 m² | +18 m² +38% | 2018 |
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| 18, Susans Road500 m away | 39 m² | 57 m² | +18 m² +46% | 2010 |
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| 34, Grove Road636 m away | 44 m² | 61 m² | +17 m² +39% | 2026 |
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| Flat 56, Park Gates, Chiswick Place0 m away | 82 m² | 99 m² | +17 m² +21% | 2024 |
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| Flat 2, Berkeley Court, 1 - 9, Wilmington Square256 m away | 66 m² | 83 m² | +17 m² +26% | 2022 |
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| 1, Elms Road445 m away | 42 m² | 59 m² | +17 m² +40% | 2020 |
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| Flat 3, 13, Arlington Road856 m away | 104 m² | 121 m² | +17 m² +16% | 2020 |
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| Flat 2, 5a, Ivy Terrace645 m away | 60 m² | 77 m² | +17 m² +28% | 2019 |
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| 118, Langney Road863 m away | 34 m² | 51 m² | +17 m² +50% | 2018 |
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| Flat 1, 9a, Spencer Road332 m away | 71 m² | 88 m² | +17 m² +24% | 2017 |
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| 6, Trinity Trees307 m away | 56 m² | 73 m² | +17 m² +30% | 2015 |
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| Flat 7, Walford House, 20, Silverdale Road815 m away | 71 m² | 88 m² | +17 m² +24% | 2014 |
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| 30, Lushington Road377 m away | 27 m² | 44 m² | +17 m² +63% | 2010 |
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| Flat 6, Grassington Lodge 24a, Grassington Road750 m away | 80 m² | 96 m² | +16 m² +20% | 2026 |
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| 1, Chelsea Mews391 m away | 73 m² | 89 m² | +16 m² +22% | 2023 |
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| Flat 3, Avenue Mansions, Elms Avenue481 m away | 68 m² | 84 m² | +16 m² +24% | 2021 |
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| Flat 2, 12, Grange Gardens646 m away | 80 m² | 96 m² | +16 m² +20% | 2019 |
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| 84, Langney Road762 m away | 43 m² | 59 m² | +16 m² +37% | 2016 |
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| 89, Ashford Road694 m away | 96 m² | 112 m² | +16 m² +17% | 2013 |
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| 23, Lushington Road408 m away | 42 m² | 58 m² | +16 m² +38% | 2009 |
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| 74, Langney Road762 m away | 42 m² | 58 m² | +16 m² +38% | 2009 |
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| 4, Bath Road599 m away | 73 m² | 88 m² | +15 m² +21% | 2026 |
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| Flat 1, Regency Court, 4 - 5, South Cliff600 m away | 85 m² | 100 m² | +15 m² +18% | 2026 |
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| Flat 26, Saffrons Court, Compton Place Road906 m away | 96 m² | 111 m² | +15 m² +16% | 2025 |
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| Flat 5, Spencer House, 8, Spencer Road277 m away | 38 m² | 53 m² | +15 m² +39% | 2023 |
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| Flat 4a, Spencer Court, Spencer Road345 m away | 72 m² | 87 m² | +15 m² +21% | 2023 |
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| Flat 7, Saffrons Mead, 2, Grassington Road714 m away | 66 m² | 81 m² | +15 m² +23% | 2022 |
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| Flat 2, Sussex House, Hartington Place222 m away | 71 m² | 86 m² | +15 m² +21% | 2020 |
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| 26b, York Road530 m away | 40 m² | 55 m² | +15 m² +38% | 2019 |
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| Flat 4, Silverdale Court, 35, Silverdale Road751 m away | 81 m² | 96 m² | +15 m² +19% | 2019 |
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| 116, Langney Road863 m away | 37 m² | 52 m² | +15 m² +41% | 2018 |
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| 11a, Arlington Road856 m away | 92 m² | 107 m² | +15 m² +16% | 2016 |
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| Flat 1, 18, Lushington Road377 m away | 79 m² | 94 m² | +15 m² +19% | 2013 |
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| Flat 8, 45, Blackwater Road718 m away | 46 m² | 61 m² | +15 m² +33% | 2011 |
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| Flat 1, 15, The Avenue874 m away | 63 m² | 78 m² | +15 m² +24% | 2011 |
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| Flat 6, Pegasus Court, 29, St Leonards Road948 m away | 47 m² | 62 m² | +15 m² +32% | 2011 |
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