The final product of Edward's remodelling effort at Builth was a castle centered atop a motte which supported a great round keep (the traces of which are barely visible today) and was enclosed by a small "chemise", a masonry wall defended by 6 towers. The two Norman baileys remained, encompassed by a curtain wall and accessed through a twin-towered gatehouse which may have been similar to the gatehouse that still guards Rhuddlan Castle. Other structures included a kitchen block and the great hall, a chapel, and residential quarters. Apparently, construction was stopped at Builth in 1282 although the work on the gatehouse may not have been complete.