55 Cowper Road Harpenden Hertfordshire Al5 5Nj

1. 9 Mar 2026

   Received by St Albans

2. 10 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 23 Jul 2026

   Decision issued: DC3 Conditional Permission

4. 7 Sep 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 41 Cowper Road Harpenden Hertfordshire Al5 5Nj

  TP/2025/0546 Submitted 16 Oct 2025 0m away

  T1 - Lime, remove to ground level as causing subsidence to 41 Cowper Road AL5 5NJ

  Granted Trees 2 docs

• 57A Cowper Road Harpenden Hertfordshire

  5/2017/2677 Submitted 21 Sep 2017 0m away

  Variation of Conditions 1 (approved plans), 2 (obscure glass), 3 (insertion of new windows) & 7 (hardstanding materials) to widen access road and hardstanding of planning permission 5/2015/3651 dated 08/08/2016 for Four semi-detached dwellings with associ

  Refused Windows or glazing 12 docs

• 43 Cowper Road Harpenden Hertfordshire Al5 5Nj

  TP/2026/0410 Submitted 25 Aug 2026 0m away

  Rear left corner of the garden. Holly tree. Remove tree completely.

  Decided Trees

• 86 Cowper Road Harpenden Hertfordshire Al5 5Nh

  5/2016/1963 Submitted 26 Jun 2016 53m away

  Single storey rear extension incorporating new pitched roof with rooflights over existing rear extension, part first floor rear extension, alterations to openings and demolition of ground floor side flank wall and part first floor rear wall (resubmission

  Decided Householder Extension Loft or dormer +1 10 docs
  Small domestic

• 3 Cranford Court Shakespeare Road Harpenden Hertfordshire Al5 5Ny

  5/2016/1918 Submitted 20 Jun 2016 82m away

  Single storey rear extension and loft conversion with front and rear rooflights

  Decided Extension Loft or dormer 11 docs
  Small domestic

• 1 Shakespeare Road Harpenden Hertfordshire Al5 5Ne

  TP/2026/0181 Submitted 14 Apr 2026 86m away

  Remove dead tree at the back of garden. Visible from adjacent car park.

  Granted Trees 2 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