| 2022 | |
| 2021 | Eric Morecambe Centre |
| 2020 | Katherine Warington School |
| 2019 | Welcombe House |
| 2018 | Not awarded |
| 2017 | Not awarded |
| 2016 | Stonehouse Court |
| 2015 | Gleneagle Manor |
| 2014 | Lea Springs |
| 2013 | New Club House - Harpenden Common Golf Club |
| 2012 | The Foresters development in Bowers Parade |
| 2011 | Not awarded |
| 2010 | Multi Use Games Area, Porters Hill, Batford & Breathing Space, Thompson's Close |
| 2009 | Not awarded |
| 2008 | St Mary's Church |
| 2007 | Southdown Ponds - Harpenden Town Council |
| 2006 | Station Master's House - Jarvis & Taylor Walton |
| 2005 | Not awarded |
| 2004 | Not awarded |
| 2003 | Development (garden & restoration of fountain outside Pizza Express) - Town Council |
| 2002 | Not awarded |
| 2001 | Not awarded |
| 2000 | |
| 1999 | St John's Church Porch |
| 1998 | Harpenden Swimming Pool |
| 1997 | St Nicholas Church extension |
| 1996 | Elms Medical practice |
| 1995 | No plaque awarded |
| 1994 | Park Hall/Town Hall complex |
| 1993 | No plaque awarded |
| 1992 | Extension to the Inn on the Green |
| 1991 | No plaque awarded |
| 1990 | The transformation of Clayton House in Vaughan Road (Granger Trust plc) |
| 1989 | The Leys Development (Granger Trust plc) |
| 1988 | Mardall House |
| 1987 | No plaque awarded |
| 1986 | No plaque awarded |
| 1985 | Restoration of the Victorian Booking Hall and Offices at Harpenden Railway Station |
| 1984 | Waitrose Supermarket development |
| 1983 | No plaque awarded |
| 1982 | Parkinson House in Vaughan Rd |
| 1981 | No plaque awarded |
| 1980 | No plaque awarded |
| 1979 | Gleneagle Hotel for their extension |
| 1978 | The restoration of Rothamsted Manor House clock tower |
| 1977 | 64/72 High street |