11 Hillside Road Harpenden Hertfordshire Al5 4Bs

1. 17 Mar 2026

   Received by St Albans

2. 10 Apr 2026

   Validated

   Checked as complete and ready for consideration.

3. 28 Aug 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

• 43 Hillside Road Harpenden Hertfordshire Al5 4Bs

  5/2016/3084 Submitted 12 Oct 2016 0m away

  Single and two storey side and rear extension, alterations to openings including juliet balcony and loft conversion with rear dormer window

  Decided Householder Extension Loft or dormer +1 9 docs
  Domestic

• 41 Hillside Road Harpenden Hertfordshire Al5 4Bs

  5/2017/2573 Submitted 10 Sep 2017 0m away

  Certificate of Lawfulness (proposed) - Loft conversion including hip to gable roof extension and rear dormer and three rooflights to front elevation

  Granted Lawful development Extension Loft or dormer 10 docs

• 3 Hillside Road Harpenden Hertfordshire Al5 4Bs

  5/2026/0472 Submitted 11 Mar 2026 0m away

  Removal of existing concrete plain tiles to the main roof and replacement with natural slate; erection of a box dormer extension to the rear roof slope with metal standing-seam cladding; and construction of a single-storey rear extension with monocouche r

  Decided Householder Extension Loft or dormer 14 docs
  Small domestic

• 11 Bloomfield Road Harpenden Hertfordshire Al5 4Dd

  5/2017/1758 Submitted 19 Jun 2017 103m away

  Part single, part two storey rear extension, two storey side extension with habitable roofspace, rooflights and alterations to openings

  Decided Householder Extension Loft or dormer 11 docs
  Domestic

• 41 Ambrose Lane Harpenden Hertfordshire Al5 4Bu

  5/2026/1189 Submitted 22 Jun 2026 124m away

  Two-storey rear extension, together with internal reconfigurations and associated fenestration alterations.

  Decided Householder Extension Windows or glazing 17 docs
  Domestic

• 51 Ambrose Lane Harpenden Hertfordshire Al5 4Bu

  5/2016/2590 Submitted 19 Aug 2016 124m away

  Removal of Conditions 4 (protection of trees), 5 (tree/natural feature protection: fencing) and 6 (method statement for protection of trees) of Planning permission 5/2016/0028 dated 13/04/2016 for Part single, part two storey rear extension with chimney a

  Decided Householder Extension Trees 7 docs
  Domestic

• 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
• 5/2026/0888 Decided

  78 Stanley Avenue Chiswell Green St Albans Hertfordshire Al2 3Az

  Proposed single storey side extension and front entrance porch

  6 May 2026 Householder