He died at Kings Stanley, Gloucestershire, the village where he had his workshop and studio for most of his life, on 4 October 1797 at the age of seventy. He died at Beech House in the village, the home he partly designed for himself, and is buried in St. George's Church.
Keck is credited with designing some fifty country houses in the South-West of England and South Wales. His works include:
- Longworth Hall, Herefordshire
- Barnsley Park, Cirencester, Gloucestershire
- Burghill Court, Herefordshire
- Flaxley Abbey, Forest of Dean, Gloucestershire
- Forthampton Court, Gloucestershire
- Ham Court, Upton-upon-Severn, Gloucestershire, demolished 1926
- Highgrove House, Tetbury, Gloucestershire
- Iscoed, Carmarthenshire
- Margam Park, Glamorgan
- Moccas Court, Herefordshire
- Newton Court, Dixton, Monmouthshire
- Penrice Castle, Glamorgan
- Slebech Park, Pembrokeshire
- Stratford Park, Stroud, Gloucestershire
- Wormington Grange, Tewkesbury, Gloucestershire
- Underdown, Ledbury, Herefordshire
Keck's work was not confined to country houses, including churches, such as Old St. Martin's, Worcestershire and St. Peter and St. Paul's, Upton-Upon-Severn, including its famed lantern and cupola; public buildings, such as the Worcester Royal Infirmary and contributions to the Stroudwater canal.
- "Parks and Gardens UK". Parksandgardens.ac.uk. Archived from the original on 2012-12-23. Retrieved 2012-03-04.
- "ANTHONY KECK Architect". Freespace.virgin.net. 1988-10-27. Archived from the original on 2011-09-14. Retrieved 2012-03-04.
- Architecture of England, Scotland, and Wales – Nigel R. Jones – Google Books. Books.google.co.uk. Retrieved 2012-03-04.
- Good Stuff IT Services (1960-06-28). "Beech House – Kings Stanley – Gloucestershire – England". British Listed Buildings. Retrieved 2012-03-04.
- A Church Near You. "Old St Martin, Worcester – Worcestershire | Diocese of Worcester". Achurchnearyou.com. Retrieved 2012-03-04.
- "Upton upon Severn – History of The Old Church". Upton.uk.net. 1921-09-17. Retrieved 2012-03-04.
- Good Stuff IT Services (2009-09-25). "Worcester Royal Infirmary Main Building and Chapel, Former Outpatients, Department & King Edward – Worcester – Worcestershire – England". British Listed Buildings. Retrieved 2012-03-04.
- "Archived copy" (PDF). Archived from the original (PDF) on 2014-05-24. Retrieved 2012-02-04.CS1 maint: archived copy as title (link)