I'm sorry for any confusion, but it seems you're looking for a single paragraph summary of a property listing. Here's a consolidated description: This exceptional building plot, just off Heol Twrch in Cwmtwrch, offers an opportunity to build a bespoke 4-bedroom detached home. The plot, measuring approximately 21m x 21m (max), is currently under full detailed planning with Powys County Council (reference number 20/1348/ful), and includes a portion of woodland to the rear. Access is via a shared driveway with a vehicle right of way. The sellers have obtained a comprehensive mining report, ensuring potential buyers are well-informed. The location is ideal, nestled in the picturesque Afon Twrch valley, yet within easy reach of the bustling town of Ystradgynlais, which provides a range of amenities including shops, cafes, and secondary education in both Welsh and English. The area is rich in natural beauty, with nearby attractions such as The National Showcaves Centre for Wales, Craig y Nos Castle & Country Park, and the Wales Ape and Monkey Sanctuary. For those who enjoy the outdoors, Henrhyd Waterfalls and the Brecon Beacons National Park are also within a short drive, making this an attractive proposition for those seeking a tranquil yet accessible lifestyle in South Wales.