21 Derwent Road Harpenden Hertfordshire Al5 3Pa

1. 9 Oct 2016

   Received by St Albans

2. 10 Oct 2016

   Validated

   Checked as complete and ready for consideration.

3. 5 Dec 2016

   Decision issued: DC3 Conditional Permission

4. 9 Aug 2026

   Added to PlanIndex

St Albans granted permission on 5 December 2016, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 24 Tintern Close Harpenden Hertfordshire Al5 3Nz

  5/2026/1114 Submitted 9 Jun 2026 100 yards away

  89% historically approved · decision due ~5 Aug

  Single storey side and rear extension. Infill of existing overhanging front elevations, new dormer to side elevation, alterations to front door (on side elevation) and replacement roof to garage

  Awaiting decision Householder Extension Loft or dormer +1 7 docs
  Small domestic

• 21 Kinsbourne Close Harpenden Hertfordshire Al5 3Pb

  5/2017/3503 Submitted 11 Dec 2017 200 yards away

  Side extension incorporating integral garage and workshop and extension to habitable roof space and dormers, conversion of existing garage to habitable room, alteration of flat roof over front projection to pitched and alterations to openings

  Granted Householder Extension Loft or dormer 12 docs
  Domestic

• Greenhaven The Common Kinsbourne Green Harpenden Hertfordshire Al5 3Nt

  5/2026/0129 Submitted 26 Jan 2026 200 yards away

  88% historically approved · decision due ~6 May

  Demolition of existing three bedroom house and garage. Construction of two, two storey houses. Plot 1 four bedroom and plot 2 five bedroom with air source heat pumps, air conditioning units and solar panels. Addition of soft landscaping and eight trees

  Awaiting decision Demolition Trees 44 docs

• 12 Crosspaths Harpenden Hertfordshire Al5 3He

  5/2016/3748 Submitted 15 Dec 2016 200 yards away

  Two storey rear extension and single storey side extension

  Granted Householder Extension 8 docs
  Small domestic

• 15 Crosspaths Harpenden Hertfordshire Al5 3Hb

  5/2017/3340 Submitted 27 Nov 2017 300 yards away

  Certificate of Lawfulness (proposed) - Conversion of garage into habitable room and installation of a partition wall

  Granted Lawful development 7 docs

• 7 The Close Harpenden Hertfordshire Al5 3Nb

  5/2017/2671 Submitted 21 Sep 2017 300 yards away

  Single storey rear extension with rooflights

  Granted Householder Extension Loft or dormer 11 docs
  Small domestic

• 5/2026/0517 Granted

  28 White Hedge Drive St Albans Hertfordshire Al3 5Tt

  Proposed two-storey rear extension, loft conversion, and alterations to the existing front entrance porch

  Received 16 Mar, published by the council 31 Aug 2026 Householder
• 5/2026/1055 Granted

  39 Oakwood Drive St Albans Hertfordshire Al4 0Ul

  Erection of a part single-storey, part two-storey wraparound extension, loft conversion including a rear dormer and rooflights, and construction of a front porch

  Received 1 Jun, published by the council 24 Jul 2026 Householder
• 5/2026/1278 Granted

  39 Foxcroft St Albans Hertfordshire Al1 5Ss

  Proposed C3 residential extension including two storey front and single storey front and side with internal alterations

  Received 1 Jul, published by the council 24 Jul 2026 Householder
• 5/2026/1170 Granted

  20 Nimrod Close St Albans Hertfordshire Al4 9Xy

  Extension of existing raised rear terrace with privacy screening and associated alterations to rear fenestration

  Received 17 Jun, published by the council 24 Jul 2026 Householder
• 5/2026/1338 Granted

  16 Hunters Ride Bricket Wood Hertfordshire Al2 3Lx

  Proposed front porch

  Received 11 Jul, published by the council 9 Aug 2026 Householder