| Welwyn Garden City - Broadwater Road West SPD Site (North) | 1,403 | 9.09 | permissioned |
| Welwyn Garden City - Broadwater Road West SPD Site (West) | 171 | 2.07 | not-permissioned |
| Hatfield - Highview (Hilltop) SPD Site | 146 | 1.85 | permissioned |
| Welwyn Garden City - Xerox Campus Bessemer Road (New build - West Blocks X2 and X3) | 125 | 1.20 | permissioned |
| Welwyn Garden City - Former QEII Hospital Howlands | 124 | 4.92 | permissioned |
| Hatfield - Comet Hotel St Albans Road West | 124 | 1.60 | permissioned |
| Welwyn Garden City - Ratcliff Tail Lift Site Bessemer Road | 110 | 2.19 | permissioned |
| Welwyn Garden City - Xerox Campus Bessemer Road (New build - East Blocks X1 and X4) | 110 | 1.25 | permissioned |
| Welwyn Garden City - Town Centre North SPD Site | 100 | 1.42 | not-permissioned |
| Hatfield - Onslow St Audreys School | 86 | 8.29 | permissioned |
| Woolmer Green - Entech House London Road | 72 | 2.19 | permissioned |
| Welwyn Garden City - Xerox Campus Bessemer Road (Bus/Entp/Devt Centre - Prior approval) | 70 | 1.51 | permissioned |
| Hatfield - 1-9 Town Centre | 66 | 0.82 | permissioned |
| Hatfield - L Kahn Manufacturing Wellfield Road | 62 | 0.88 | not-permissioned |
| Welwyn Garden City - Norton Building Bridge Road East | 59 | 0.99 | not-permissioned |
| Welwyn Garden City - Inspira House, Martinfield | 54 | 0.42 | permissioned |
| Welwyn Garden City - 51 Bridge Road East | 54 | 0.64 | permissioned |
| Cuffley - Everest House, Sopers Road | 45 | 0.26 | permissioned |
| Welwyn Garden City - Mercury House, 1 Broadwater Road | 43 | 0.24 | permissioned |
| Welwyn Garden City - Queen Elizabeth II Hospital Nursery and MRI Centre | 41 | 0.40 | permissioned |
| Welwyn Garden City - Rank Xerox Technical Centre Bessemer Road Block X6 | 38 | 0.57 | permissioned |
| Welwyn Garden City - Broadwater Road West SPD Site (Central - Roche Building) | 34 | 0.61 | permissioned |
| Welwyn Garden City - 80 Bridge Road East | 32 | 0.45 | not-permissioned |
| Welwyn Garden City - Xerox Campus, Bessemer Road (New Build - Central, Block X5) | 30 | 0.26 | permissioned |
| Welwyn Garden City - 37 Broadwater Road | 24 | 0.22 | permissioned |
| Welwyn Garden City - Highways House 43-45 Broadwater Road | 23 | 0.38 | permissioned |
| Hatfield - 51 Great North Road | 23 | 0.18 | permissioned |
| Welwyn Garden City - Stonehills House, Stonehills (Conversion) | 23 | 0.16 | permissioned |
| Welwyn Garden City - St Michaels House Holwell Road | 22 | 0.43 | not-permissioned |
| Hatfield - Garages off Garden Avenue | 22 | 0.34 | permissioned |
| Welwyn Garden City - Xerox Campus, Bessemer Road (Business Centre - Additional units) | 22 | 0.20 | permissioned |
| Welwyn Garden City - Xerox Campus Bessemer Road (Entp/Devt Centre - Additional units) | 22 | 0.40 | permissioned |
| Hatfield - Colonial House 87 Great North Road | 20 | 0.11 | permissioned |
| Hatfield - GE Site, Great North Road (South) | 18 | 0.10 | permissioned |
| Welwyn Garden City - Fountain House Howardsgate (Office to residential conversion) | 18 | 0.05 | permissioned |
| Welwyn Garden City - Hyde Valley House Hyde Valley | 17 | 0.25 | permissioned |
| Welwyn Garden City - Accord House 28 Bridge Road East | 17 | 0.19 | permissioned |
| Hatfield - Car park and shops north of Salisbury Square | 17 | 0.94 | permissioned |
| Welwyn Garden City - Former Xerox Site Bessemer Road (West - Block X7) | 16 | 0.17 | permissioned |
| Hatfield - 36 Salisbury Square (First and second floor conversion) | 16 | 0.07 | permissioned |
| Hatfield - 41-43 Roe Green Lane | 14 | 0.12 | permissioned |
| Hatfield - Garages at Hollyfield | 14 | 0.27 | permissioned |
| Brookmans Park - Land north of Green Close | 12 | 0.16 | permissioned |
| Welwyn Garden City - Stonehills House, Stonehills (Additional units) | 12 | 0.13 | permissioned |
| Welwyn - The Frythe (Phase 3 - Main House Conversion) | 12 | 0.39 | permissioned |
| Cuffley - Cuffley Motor Company Station Road | 12 | 0.10 | permissioned |
| Welwyn - The Frythe (Phase 4 - West) | 12 | 5.92 | permissioned |
| Hatfield - Meridian House The Common | 9 | 0.10 | not-permissioned |
| Welwyn Garden City - Fountain House Howardsgate (Extension) | 9 | 0.05 | permissioned |
| Welwyn Garden City - Diocesan Education Centre Hall Grove | 9 | 0.25 | permissioned |