| 1 Church Lane, Undy, Caldicot | Freehold | 122 m² | £275,000 (2005) |
| Arch Farm, Undy, Caldicot | - | 201 m² | - |
| Brook House, Brook Farm, Church Road, Undy | Freehold | 304 m² | £430,000 (2012) |
| Camelot, Undy, Caldicot | - | 91 m² | - |
| Cartref, Undy, Caldicot | - | 80 m² | - |
| Cordyline Cottage, Undy, Caldicot | Freehold | 121 m² | £365,000 (2021) |
| Farm Cottage, Undy, Caldicot | - | 98 m² | - |
| Great House Farm, Undy, Caldicot | - | 224 m² | - |
| Green Willow, Undy, Caldicot | Freehold | 133 m² | £245,000 (2013) |
| Greenwillows, Undy, Caldicot | - | 107 m² | - |
| Health & Safety Solutions, Church Farmhouse Church Lane,, Undy, Caldicot | Freehold | 151 m² | £230,000 (2009) |
| Jelan, Undy, Caldicot | - | 64 m² | - |
| Lyn Orchard, Undy, Caldicot | Freehold | 90 m² | £353,000 (2022) |
| Maroel, Undy, Caldicot | Freehold | 137 m² | £180,000 (2007) |
| Moorgate Bungalow, Undy, Caldicot | Freehold | 103 m² | £105,000 (1996) |
| Moorgate, Undy, Caldicot | Freehold | 112 m² | £240,000 (2020) |
| Moorlands, Undy, Caldicot | - | 250 m² | - |
| Moorview Farm, Undy, Caldicot | - | 216 m² | - |
| Old Cross Cottage, Undy, Caldicot | Freehold | 120 m² | £460,000 (2023) |
| Old Cross Farm, Undy, Caldicot | - | 190 m² | - |
| Orchard House, Undy, Caldicot | Freehold | 169 m² | £585,000 (2021) |
| Parkside House, Undy, Caldicot | - | 281 m² | - |
| Rocklands West End, Undy, Caldicot | - | 120 m² | - |
| Rose Cottage The Causeway, Undy, Caldicot | Freehold | 224 m² | £115,500 (1999) |
| The Annexe Old Cross Farm, Undy, Caldicot | - | 56 m² | - |
| The Cottage, Church Road, Undy, Undy | - | 205 m² | - |
| The Granary, Great House Farm, Undy, Caldicot | - | 299 m² | - |
| The Laurels, Undy, Caldicot | Freehold | 106 m² | £369,000 (2016) |
| The Meadows, West End, Undy, Caldicot | Freehold | 197 m² | £490,000 (2018) |
| The Old Gardens, Church Road, Undy, Caldicot | - | 185 m² | - |
| The Quarry, Undy, Caldicot | Freehold | 73 m² | £350,000 (2025) |
| The Stables, Undy, Caldicot | - | 124 m² | - |
| The Well Cottage, Undy, Caldicot | Freehold | 171 m² | £650,000 (2022) |
| Undy Building Supplies, West End Farm, Undy, Caldicot | - | 200 m² | - |
| Walnut Tree House, Undy, Caldicot | Freehold | 167 m² | £515,000 (2024) |
| Wentwood House, Undy, Caldicot | Freehold | 334 m² | £525,000 (2017) |
| Wychwood House, Undy, Caldicot | Freehold | 203 m² | £380,000 (2011) |
| Zion, Undy, Caldicot | Freehold | 156 m² | £335,000 (2016) |
