You may need planning permission if you are planning a larger extension. All extensions will need building regulations approval. An architect can assist with this and if planning permission is required. A reputable contractor will also be able to advise you if this is needed as well.
Clynderwen
Clynderwen is a country direct village and area, traditionally in Carmarthenshire in Wales, but carried out as part of Pembrokeshire. It pushes the A478 Tenby to Cardigan road south of the town of Llandissilio and north of the community of Narberth. Clunderwen, translating into English as "oak thicket", is named after an estate of the very same name. On 1 April 2003, the town was transferred from the management county of Carmarthenshire to that of Pembrokeshire, complying with a border adjustment in between the counties. At the same time, a name adjustment to Clunderwen was suggested to mirror the actual use by the community council as well as on road as well as other indicators.