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 has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. 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 102m away

  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

  Decided Householder Extension Loft or dormer +1 7 docs
  Small domestic

• Greenhaven The Common Kinsbourne Green Harpenden Hertfordshire Al5 3Nt

  5/2026/0129 Submitted 26 Jan 2026 175m away

  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

  Decided Demolition Trees 39 docs

• 7 The Close Harpenden Hertfordshire Al5 3Nb

  5/2017/2671 Submitted 21 Sep 2017 271m away

  Single storey rear extension with rooflights

  Decided Householder Extension Loft or dormer 11 docs
  Small domestic

• 2 Crosspaths Harpenden Hertfordshire Al5 3Hd

  5/2016/1917 Submitted 20 Jun 2016 280m away

  Two storey side extension following demolition of existing garage and car port

  Decided Householder Extension Demolition 15 docs
  Domestic

• The Fox Ph 469 Luton Road Harpenden Hertfordshire Al5 3Qe

  5/2017/2736 Submitted 27 Sep 2017 286m away

  Advertisement Consent - Display of one externally illuminated standing sign, one internally illuminated standing sign, seven non-illuminated wall mounted signs and one non-illuminated board sign

  Granted Advertising 8 docs

• 447 Luton Road Harpenden Hertfordshire Al5 3Qe

  5/2017/1803 Submitted 25 Jun 2017 286m away

  Discharge of Condition 4 (details of materials) of Listed Building consent 5/2016/2973 dated 06/12/2016 for Replacement windows

  Granted Conditions Windows or glazing 7 docs

• 5/2026/1173 Decided

  6 Longacres St Albans Hertfordshire Al4 0Dr

  Demolition of existing outbuilding and construction of single storey rear extension

  18 Jun 2026 Householder
• 5/2026/0299 Decided

  12 Rowlatt Drive St Albans Hertfordshire Al3 4Nb

  Demolition of existing side and rear extension and construction of a canopy porch, part single, part two storey front, two storey side and single storey rear extension

  17 Feb 2026 Householder
• 5/2026/0318 Refused

  7 Ardens Way St Albans Hertfordshire Al4 9Uw

  Demolition of existing side canopy, detached garage, rear patio and garden shed and the construction of two storey front, side and rear extensions, together with part single storey rear extension and a front porch canopy and extension to driveway

  19 Feb 2026 Householder
• 5/2026/1139 Decided

  50 Fontmell Close St Albans Hertfordshire Al3 5Hu

  Single storey rear extension and side windows with top openers over 1.7m high

  10 Jun 2026 Householder
• 5/2026/0525 Decided

  11 Hillside Road Harpenden Hertfordshire Al5 4Bs

  Garage conversion, with part roof extension and new front porch extension

  17 Mar 2026 Householder